MX2008005688A

MX2008005688A - Cementitious composites having wood-like properties and methods of manufacture.

Info

Publication number: MX2008005688A
Application number: MX2008005688A
Authority: MX
Inventors: Per Just Andersen; Simon K Hodson
Original assignee: Khashoggi E Ind
Priority date: 2005-11-01
Filing date: 2006-11-01
Publication date: 2008-09-24
Also published as: WO2007053852A3; WO2007053852A2; CN101346321A; EP1954645A2; BRPI0618052A2; CA2627717A1; AU2006308536A2; EP1954645A4; AU2006308536A1

Abstract

A method of manufacturing a cementitious composite includes: (1) forming mixing an extrudable cementitious composition by first forming a fibrous mixture comprising fibers, water and a rheology modifying agent and then adding hydraulic cement; (2) extruding the extrudable cementitious composition into a green extrudate, wherein the green extrudate is characterized by being form-stable and retaining substantially a predefined cross-sectional shape; (3) removing a portion of the water by evaporation to reduce density and increase porosity; and (4) causing or allowing the hydraulic cement to hydrate to form the cementitious composite. Such a process yields a cementitious composite that is suitable for use as a wood substitute. The wood-like building products can be sawed, nailed and screwed like ordinary wood.

Description

CEMENTITIOUS COMPOUNDS HAVING WOOD TYPE PROPERTIES AND MANUFACTURING METHODS DESCRIPTION OF THE INVENTION The present invention relates in general to cementitious construction products containing reinforcing fibers, more particularly, to extrudable cementitious compositions for use in the manufacture of construction products. cementitious that have wood type properties. Timber and other construction products obtained from trees have been fundamental to build structures throughout history. Wood is a source for many different building materials due to its ability to cut and give it various shapes and sizes, its overall operation as a building material, and its ability to be formed in many different construction structures. Not only can trees be cut in two by four, one by tens, plywood, cut top, and the like, but different pieces of wood can easily be attached by glue, nails, screws, bolts, and other fasteners. Wood lumber can be shaped and easily combined with other products to produce a desired structure. Although trees are a renewable resource, it can take many years for a tree to grow to a usable size. As such, trees may be disappearing faster than they can grow, at least locally in various parts of the world. In addition, deserts or other areas without an abundance of trees have either to import timber or to deprive themselves of construction structures that require timber. Due to concerns regarding deforestation and other environmental issues related to logging, there has been an attempt to create "wood substitutes" for other materials such as plastics and concrete. While plastics have some favorable properties such as moldability and high tensile strength, they are weak in compressive strength, are generally derived from non-renewable resources, and are generally considered to be less harmful to the environment than natural products . On the other hand, concrete is a building material that is essentially inexhaustible because its constituents are as common as clay, sand, rocks, and water. Concrete usually includes hydraulic cement, water, and at least aggregates, where water reacts with cement to form cement paste, which binds aggregates. When the hydraulic cement and water are cured (ie, hydrated) to join them, the aggregates and other solid constituents together, the resulting concrete can have an extremely high compressive strength and flexural modulus, but it is a brittle material with Relatively low tensile strength compared to its compressive strength, with small stiffness or deflection properties. However, by adding reinforcers such as massive construction structures or rebar, concrete is useful for building highways, construction foundations, and in general large, massive structures. Previous attempts to create concrete substitutes for wood have not provided products with adequate characteristics. In part, this is due to traditional methods for manufacturing concretes that require mixtures that are cured in molds, and have not provided products with the proper stiffness or flexural strength to substitute wood. An attempt to manufacture wood substitutes from concrete involves the "Hatschek process", which is a modification of the process used to make paper. In the Hatschek process, construction products are made from a highly aqueous slurry containing up to 99% water, hydraulic cement, aggregates and fibers. The aqueous slurry has an extremely high water-to-cement ratio ("a / c") and is dried to produce a composition that is capable of being cured to form solid construction products. The aqueous slurry is applied in successive layers to a porous drum and is dried between the subsequent layers. The fibers are added so as not to allow the solid cement particles to run off with the water and impart a level of resistance. When you are still in a wet condition, without hardening, the dried material is removed from the drum, optionally shaped, and allowed to cure. The resulting products are placed in layers. Although they are adequately resistant when kept dry, over time they tend to separate or split into sheets when exposed to excessive moisture. Because the products are placed in layers, the components, particularly the fibers, do not disperse homogeneously. Other construction products manufactured using hydraulically castable binders include gypsum board and cement board. Gypsum board is extensively used in the construction industry as a structural material for walls. Because it is very sensitive to moisture, it is not generally suitable for use in showers and other areas that have high humidity. The cement board is more resistant to the effects of water and can be used as a substitute for gypsum board. The panel is typically made by placing an aqueous slurry between sheets of paper. Both the gypsum board and the cement board are highly brittle, which allows them to crack and break to produce plates of a desired size. Although it is possible to insert nails and screws into such panels, they have low grip of nails and screws. This is because they easily fracture under the punctual load of nails and screws due to lack of accuracy. Therefore, although the panel can be nailed or screwed to underlying metal or wood plates, the panel is not a good structural material by itself. Indeed, when attaching accessories or other attachments to the panel, it is generally necessary to use a Molly or knuckle type anchor, since a nail or screw by itself will be easily removed from the panel. While methods for making flexible paper sheets using cement and fibers had previously been invented, such sheets were flexible as paper and could be folded, folded or rolled into a variety of different containers for beverages or foods very similar to paper. Such sheets could not be suitable for use as a construction material. First, such sheets were made by rapidly drying a mouldable composition on a heated Yankee roller within seconds or minutes of formation, which resulted in hydraulic cement particles that became simple fillers, with the rheology modifying agent that provided the most , if not all, the adherent force. Because the cement particles were acting simply as fillers, they were eventually replaced with cheaper calcium carbonate filler particles. Therefore, it would be of advantage to provide a cementitious composition and a method for preparing wood-like construction products that can be used as a substitute for wood products and that can be manufactured without having to drain a highly aqueous slurry. In addition, it would be beneficial to provide cementitious construction products that could be used as a substitute for wood, including a wide variety of wood construction products, such as structural and decorative products that are currently made of wood. The present invention relates to cementitious building materials that can function as a wood substitute. Accordingly, the present invention comprises the use of cementitious compositions extrudable or otherwise shaped into a wood-like construction product that can be used as a substitute for many known wood products. Fibrous cementitious construction products may have similar properties to wood building products. In some embodiments, fibrous cementitious construction products can be sawed, cut, drilled, hammered, and fixed together as is commonly done with wood building products and are described in more detail below. Ordinarily, the concrete is generally denser and harder than the wood and therefore it is harder to saw, nail or screw. In general, the capacity of the cementitious construction to be sawed using ordinary wood saws, nailed using a hammer, or screwed using a common screwdriver is a hardness function, which is '' roughly proportional to the density (ie, the lower the density, the lower the hardness as a general rule). In cases where it is desirable for cementitious construction products to be sawn, nailed and / or bolted using tools commonly found in the construction industry when using wood products, cementitious construction products will generally have an approaching hardness. to the wood (that is, to be softer than conventional concrete). The incorporation of the rheology and fiber modifying agent helps create products that are softer than conventional concrete. In addition, the incorporation of a substantial amount of well-dispersed pores helps to reduce the density, which, in turn, helps to reduce hardness. Although not strictly a measure of hardness, it has been found that the flexural modulus of a material correlates with hardness as it relates to the ability to saw, nail and / or screw cementitious construction products. Ordinarily the concrete typically has a flexural modulus with an order of magnitude measured in hundreds of gigapascals (101: lPa), which results in an order of magnitude of about 107 psi. In contrast, the flexural modulus of wood margins from about 500,000 psi to about 5,000,000 (about 3.5 to 35 gigapascals). Concrete is typically around 5 to 100 times harder than wood. Softer woods, such as pine, which can be sawed, nailed and screwed more easily than harder woods, are up to 100 times softer than concrete, such as the flexural modulus. In one embodiment, the present invention includes a cementitious composite product for use as a wood substitute. Such a product may include a cured cementitious compound comprising hydraulic cement, a rheology modifying agent, and fibers. The cured cementitious compound can be characterized by the following: being able to saw by hand with a saw for wood; a flexural modulus in a range of about 200,000 psi to around 5,000,000 psi; a flexural strength of up to about 4,000 psi; a preferred density of less than about 1.2 g / cm3, more preferably less than about 1.15 g / cm3, still more preferably less than about 1.1 g / cm3, and more preferably less than about 1.05 g / cm3 , and fibers substantially homogenously distributed through the cured cementitious composition, preferably in a concentration greater than about 10% by dry weight. Construction products manufactured in accordance with the present invention are much more rigid than paper products that contain cement. Because the fibers are substantially homogeneously dispersed (ie, they are placed in layers as in the Hatschek process), the construction products are not separated or divided into sheets when exposed to moisture. The cured cementitious composition is prepared by mixing an extrudable cementitious composition including water in a concentration of from about 25% to about 75% by wet weight, the hydraulic cement in a concentration of from about 25% to about 75% by wet weight, a rheology modifying agent in a concentration from about 0.25% to about 5% by wet weight, and fibers in a concentration greater than about 5% by wet weight. The extruded compositions are characterized by having a clay-like consistency with a high load of remaining deformation, properties of Binghamian plastic and stability immediately. After mixing, the extrudable cementitious composition can be extruded into an unprocessed extrudate having a predefined cross-sectional area. The unprocessed ext-noise has the advantage of having a stable shape in the extrusion to be able to retain its shape and area in cross section so as not to decrease sharply after extrusion and to allow handling without breaking. After extruding, the hydraulic cement within the unprocessed extrudate can be cured to form the cured cementitious compound. According to one embodiment, the amount of water initially used to form an extrudable composition is reduced by evaporation before, during or after hydration of the cement binder. This can be achieved by drying in an oven, typically at a temperature below the boiling point of the water to produce controlled drying while not interfering with the hydration of the cement. There are at least two benefits that result from such drying: (1) the water to cement ratio can be reduced, which increases the strength of the cement paste and (2) the water removed leaves behind the porosity, which can substantially reduce the density and hardness of the resulting product without a concomitant reduction in strength. The nominal or apparent water / cement ratio of the extrudable composition may initially be in a range of about 0.8 to about 1.2. However, the effective water / cement ratio based on water that is actually available for cement hydration is typically much lower. For example, after removing a portion of water by evaporation, the resulting water / cement ratio is typically in a range of from about 0.1 to about 0.5, for example, preferably from about 0.2 to about 0.4, most preferably about from 0.25 to around 0.35, and more preferably around 0.3. It has been found that not all the added water can be removed by evaporation when heated in an oven at a temperature of 63 ° C (145 ° F), which indicates that a part of the water is able to react with and hydrate the cement even while it is heated, making it chemically combined water instead of free water that can evaporate. This process differs from the processes that use steam curing, in which no water is removed, or that heat a material above the boiling point of water, where the water is removed too quickly to allow significant hydration of the cement particles. The fibers used in the cementitious compositions according to the invention can be one or more hemp fibers, cotton fibers, trunk fibers or plant leaves, hardwood fibers, softwood fibers, glass fibers, graphite fibers. , silica fibers, ceramic fibers, metal fibers, polymer fibers, polypropylene fibers, and carbon fibers. The amount of fibers that are substantially homogeneously distributed through the cured cementitious composition is preferably greater than about 15% by dry weight, more preferably greater than about 20% by dry weight. Some fibers, such as plant or wood fibers, have a high affinity with water and are capable of substantially absorbing quantities of water. That means that a part of the water added to the cementitious composition to make it extrudable can be tied with the fibers, thus reducing the effective water / cement ratio since the water bound by the fibers is not readily available to hydrate the water. cement binder. The hydraulic cement binder used in the cementitious compositions according to the invention may be one or more of Portland cements, MDF cements, DSP cements, Densit type cements, Pyrament type cements, calcium aluminate cements, gypsums, cements silicate, gypsum cements, phosphate cements, high alumina cements, micro fine cements, slag cements, magnesium oxychloride cements, and combinations thereof. The cement binder contributes at least about 50% of the overall adhesive strength of the construction product (eg, in combination with the adhesive strength imparted by the rheology modifying agent). Preferably, the hydraulic cement will contribute at least about 70% of the adhesive strength as a whole, more preferably at least about 80%, and most preferably at least about 90% of the adhesion strength. Because the hydraulic cement binder contributes substantially to the overall strength of construction materials, they are much stronger and have much higher flexural strength compared to paper-type products that mainly employ hydraulic cement as a filler (i.e. , by heating to 150 ° C and rapidly removing all or substantially all the water by evaporation). The rheology modifying agent can be one or more polysaccharides, proteins, celluloses, starches such as amilpectin, amulose, SEAgel, starch acetates, starch hydroxyethers, ionic starches, long chain alkyl starches, dextrins, amine starches, phosphate starches , dialdehyde starches, cellulose ethers such as methylhydroxyethylcellulose, hydroxymethylethylcellulose, carboxymethylcellulose, methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, and clay. The rheology modifying agent is preferably included in an amount in a range of about 0.25% to about 5% by wet weight of the cementitious composition, more preferably in a range of about 0.5% to about 4% by weight. wet weight, and more preferably in a range of about 1% to about 3% wet weight. Like fibers, the rheology modifying agent can be combined with water, thus reducing the effective water / cement ratio compared to the nominal ratio based on real added water instead of water that is available for hydration. While the rheology modifying agent can act as a binder, it will typically contribute less than about 50% of the adhesive strength as a whole. Optionally, a setting accelerator may be included in a concentration of about 0.01% to about 15% dry weight, wherein the setting accelerator may be one or more Na2OH, KC03, KOH, NaOH, CaCl2, C02, magnesium chloride, triethanolamine, aluminates, inorganic salts of HC1, inorganic salts of HN03, inorganic salts of H2SO4, silicate hydrates of calcium (CSH), and combinations thereof. Setting accelerators can be especially useful in the case where rapid resistance is desired to handle and / or where a portion of the water is removed by evaporation during initial hydration. An aggregate material may also be included, which is one or more of sand, dolomite, gravel, rock, basalt, granite, limestone, sandstone, glass beads, aerogels, perlite, vermiculite, exfoliated rock, xerogels, mica, clay, synthetic clay, alumina, silica, loose ash, silica fume, tabular alumina, kaolin, glass microspheres, ceramic spheres, gypsum dihydrate, calcium carbonate, calcium aluminate, and combinations thereof In one embodiment, the cured cementitious compound can receive an IOd nail when hammered therein with a hand hammer. The cured cementitious composite may have an extraction strength of at least about 25 lbf / in for the lOd nail, preferably at least about 50 lbf / in for the lOd nail. In addition, the cured cementitious composite can have an extraction strength of at least about 300 lbf / inch for a screw, preferably at least about 500 lbf / inch for the screw. Resistance to extraction is generally related to a number of fibers within the cementitious compound (ie, it increases with the fiber content it increases, all things being equal). The fibers create greater localized fracture energy and tightness that resists formation or cracking in and around an orifice made by a nail or screw. The result is a rebound effect in which the matrix holds the nail by friction forces or the screw by both friction and mechanical forces.

In one embodiment, the method for making the cementitious composite may include extruding the extrudable cementitious composition around at least one reinforcing member selected from the group consisting of reinforcing bar, wire, mesh, and fabric to at least partially encapsulate the reinforcing member within the unprocessed extrudate. In one embodiment, the method for making the cementitious composite product can include the following: extruding an unprocessed extrudate having at least one continuous orifice that is stably; inserting a reinforcing bar and an adherent agent into the continuous orifice while the cementitious compound is in an unprocessed state with stable form or is at least partially cured; and adhering the reinforcing bar to a surface of the continuous orifice with the adherent agent. Optionally, the bonding agent is applied to the reinforcement bar before inserting the reinforcement bar. In one embodiment, the method for making the cementitious product can include configuring the cementitious compound in a construction product to be a substitute for a wood building product. As such, the construction product can be manufactured with a shape selected from the group consisting of a rod, bar, tube, cylinder, board, I-beams, service wood post, cut-off lid, two-by-four, one-by-eight, board , straightened sheet, roof tile, and a table that has a hollow interior. Construction products are typically manufactured using a process that includes extrusion, but may also include one or more intermediate or finishing processes. An intermediate process typically occurs while the composition is in an uncured, unprocessed state, while a finishing process typically occurs after the material has cured or hardened. Unlike wood, which can not be softened appreciably except by damaging or weakening the wood structure, the concrete is plastic and moldable before curing. Construction products made from them can be changed in shape (ie, curved or bent) while in an unprocessed state to produce shapes that are generally hard or impossible to achieve using real wood. The surface or cementitious matrix of the construction products can be treated to be waterproof, using waterproofing agents such as silanes, siloxanes, die cutters, and other waterproofing agents known in the concrete industry, which is another advantage with respect to wood. Such materials can be mixed in and / or applied to the surface of the cementitious construction products.

Construction products can be solid or they can be hollow. Providing continuous holes when extruding around a solid mandrel to produce a discontinuity produces construction products that are light in weight. One or more such holes can be filled with reinforcement of the reinforcing bar (for example, adhered with epoxy or other adhesive), they can provide a conduit for electric cables or they can be used to screw the construction product very similar to a pre-drilled hole. -boring. The construction products may comprise complex extruded structures. They can have almost any size or shape in cross section. They can be shaped into large sheets (for example, when extruded with a roller) or blocks (for example, through large die openings) and then crushed into smaller sizes such as wood. In one embodiment, a method for making the cementitious product can include processing the unprocessed extruded with stable form and / or cured cementitious compound by at least one process selected from the group consisting of bending, stamping, impact molding, cutting, sawing, sanding, shredding, texturizing, flattening, polish, polish, pre-drill holes, paint and dye. In one embodiment, a method for making the cementitious composite product may include recycling a portion of an unprocessed material or extrudate of waste cut from the main body of a construction product (eg, by stamping), where recycling includes combine the unprocessed extruded residue with an extrudable cementitious composition. In one embodiment, the process for curing the hydraulic cement may include heat curing or autoclaving. In one embodiment, the extrusion can be through a die opening. Alternatively, the extrusion may be by means of roll extrusion. This and other embodiments and features of the present invention will become more fully apparent from the following description and appended claims, or may be learned by practice of the invention as set forth below. BRIEF DESCRIPTION OF THE DRAWINGS To further clarify the foregoing and other advantages and features of the present invention, a more particular description of the invention will be given with reference to specific embodiments thereof which are illustrated in the accompanying drawings. It is appreciated that these drawings describe only typical embodiments of the invention and therefore are not considered as limiting their scope. The invention will be described and explained with additional specificity and detail through the use of the accompanying drawings in which: Figure 1A is a schematic diagram illustrating one embodiment of an extrusion process for manufacturing a cementitious construction product; Figure IB is a schematic diagram illustrating an embodiment of an extrusion die for making a cementitious construction product having a continuous orifice extending therethrough; Figure 1C is a perspective view illustrating modalities of the cross-sectional areas of extruded cementitious construction products; Figure 2 is a schematic diagram illustrating one embodiment of a roller extrusion process for preparing a cementitious construction product; Figures 3A-D are perspective views illustrating embodiments for coextruding a cementitious construction product with a structurally reinforcing element; Figure 4 is a schematic diagram illustrating one embodiment of a process for structurally reinforcing a cementitious construction product; Figure 5A is a perspective view illustrating a concrete of a prior art and a nail inserted therein; Figure 5B is a perspective view illustrating one embodiment of a cementitious construction product and a nail inserted therein; Figure 6A is a longitudinal sectional view of Figure 4; Figure 6B is a mid-section cross-sectional view of Figure 6A; Figure 7A is a longitudinal sectional view of Figure 5; Figure 7B is a mid-section cross-sectional view of Figure 7A; Figure 8 is a graph of wood flexural strengths, a form of a cementitious construction product, and a form of a cement reinforced construction product with reinforcing bar; Figure 9 is a graph of a tensile strength of a form of a cementitious construction product; and Figure 10 is a graph of the displacement of wood and a modality of a cementitious construction product by a compressive force. Generally, the present invention relates to cementitious compositions and methods for preparing such compositions and manufacturing cementitious construction products having similar properties to wood building products. The terminology used herein is used for the purpose of describing particular modalities only and is not intended to be limiting. I General Definitions The term "multi-component" refers to cementitious compositions reinforced with fiber and extruded compounds prepared therefrom, which typically include three or more phases or different materials chemically or physically. For example, these extruded compositions and resulting building products may include components such as rheology modifying agents, hydraulic cements, other hydraulically castable materials, setting accelerators, fibers, inorganic aggregates, organic aggregates, dispersants, water, and other liquids. . Each of these broad categories of materials impart one or more unique properties to extrude mixtures prepared therefrom as well as for the final article. Within these broad categories it is possible to include even more different components (such as two or more inorganic aggregates or fibers) that can impart different, but complementary, properties to the extruded article. The terms "hydraulically settable composition" and "cementitious composition" are intended to refer to a broad category of compositions and materials that contain both a hydraulically settable binder and water as well as other components, despite the point of hydration or cure that has taken place. As such, the cementitious materials include hydraulic pastes or hydraulically set compositions in an unprocessed state (ie, uncured, soft, or castable), and a cured or hardened cementitious construction product. The term "homogeneous" is intended to refer to a composition that is uniformly mixed so that at least two random samples of the composition have approximately or substantially the same amount, concentration, and distribution of a component. The terms "hydraulic cement", "hydraulically settable binder", "hydraulic binder" or "cement" are intended to refer to the component or combination of components within a cementitious or hydraulically settable composition which is an inorganic binder such as, for example, Portland, loose ash, and plasters that harden and heal after exposure to water. These hydraulic cements develop increased mechanical properties such as hardness, compressive strength, tensile strength, flexural strength, and bonding of surface components (eg, bonding aggregates to cement) by reacting chemically with water. The terms "hydraulic paste" or "cement paste" are intended to refer to a mixture of hydraulic cement and water in an unprocessed state as well as hardened paste resulting from the hydration of the hydraulic binder. As such, within a hydraulically settable composition, the cement paste joins the individual solid materials, such as fibers, cement particles, aggregates, and the like. The terms "fiber" and "fibers" include both natural and synthetic fibers. Fibers that typically have an aspect ratio of at least 10: 1 are added to an extrudable cementitious composition to increase the elongation, deflection, tensile, and fracture energy, as well as tensile and flexural strength of the resulting extruded composite or Finished construction product. The fibers reduce the possibility that the unprocessed extrudate, extruded articles, and hardened or cured articles produced therefrom will rupture or rupture when the forces are applied thereto during handling, processing, and curing. Also, the fibers can provide wood-like properties to cementitious construction products, such as nail grip, screw grip, pull-out resistance, and the ability to saw by machine or a hand saw, and / or drilled with a auger for drilling wood. The fibers can absorb water and reduce the effective water / cement ratio. The term "fiber reinforced" is intended to refer to fiber reinforced cementitious compositions that include fibers to provide some structural reinforcement to increase a mechanical property associated with an unprocessed extrudate, extruded articles, and hardened or cured composites as well as the construction products produced thereof. Additionally, the key term is "reinforced", which clearly distinguishes the extruded, unprocessed cementitious compositions, and cured construction products of the present invention from conventional cementitious compositions and compositions. The fibers primarily act as a reinforcing component to specifically add tensile strength, flexibility, and durability to construction products as well as to reinforce any cut or formed surfaces therein. Because they are substantially homogeneously dispersed, construction products are not separated or divided into sheets when exposed to moisture as products can be made using the Hatschek process. The term "mechanical property" is intended to include a property, variable, or parameter that is used to identify or characterize the mechanical strength of a substance, composition, or article of manufacture. Accordingly, a mechanical property may include the amount of elongation, deflection, or compression before breaking or breaking, tension and / or pressure before rupture, tensile strength, compressive strength, Elasticity Modulus, firmness, hardness, deformation, strength, resistance to extraction, and the like. The terms "extruded", "extruded form", or "extruded article", are intended to include any future or known designed form of articles that are extruded using the extrudable compositions and methods of the present invention. For example, the extruded composite can be prepared in rods, rods, tubes, cylinders, boards, I-beams, utility poles such as light poles, telephone poles, antenna poles, cable poles, and the like, two by four, one by four, boards, straightened sheets, other traditional wood products, roof tiles, boards that have electrical conduits, and reinforced articles with rebar. Additionally, an extruded building product can be initially extruded as an "uneven shape" and then shaped, crushed or otherwise refined in a production article, which is intended to be included by the use of those present terms. For example, a large block or piece (for example, a 16 by 16) can be cut or shredded in a plurality of two times four. The term "extrusion" can include a process wherein a material is processed or pressed through an opening or through an area having a certain size to shape the material to conform to the opening or area. As such, an extruder that presses a material through a die opening can be an extrusion shape. Alternatively, roll extrusion, which includes pressing a composition between a set of rolls, may be another form of extrusion. Roller extrusion is described more in detail later in Figure 2. In any case, extrusion refers to a process that is used to shape a mouldable composition without cutting, grinding, sawing or the like, and usually includes pressing or passing the material through an opening having a predefined cross-sectional area. The terms "hydrated" or "cured" are intended to refer to a level of a hydraulic reaction that is sufficient to produce a hardened cementitious construction product that has obtained a substantial amount of its maximum or potential strength. However, the cementitious compositions or extruded building products may continue to be hydrated or cured long after they have reached a significant hardness and a substantial amount of their maximum strength. The terms "unprocessed," "unprocessed material," "extruded unprocessed," or "unprocessed state" are intended to refer to the state of a cementitious composition that has not yet reached a substantial amount of its ultimate strength; however, the "unprocessed state" is intended to identify that the cementitious composition has sufficient cohesion to retain an extruded form before hydrating or curing. As such, a freshly extruded extrudate comprising hydraulic cement and water should be considered as "unprocessed" before a substantial amount of hardening or curing has taken place. The unprocessed state is not necessarily a well-defined line of demarcation for the amount of curing or hardening that has taken place, but should be interpreted as being the state of the composition before it is substantially cured. Therefore, a cementitious composition is in the unprocessed state after extrusion and before being substantially cured. The term "stable form" is intended to refer to the condition of an unprocessed extrudate immediately in the extrusion which is characterized in that the extrudate has a stable structure that does not deform under its own weight. As such, an unprocessed extrudate having a stable shape can retain its shape during handling and further processing. The term "compound" is intended to refer to a composition in a stable manner that is made up of different components such as fibers, rheology modifiers, cement, aggregates, setting accelerators, and the like. As such, a compound is formed while increasing the hardness or shape stability of the unprocessed extrudate, and can be prepared in a construction product. The term "dry weight" is intended to refer to the composition that is characterized without the presence of water or other equivalent solvent or moisturizing reagent. For example, when the relative concentrations are expressed as percentages in dry weight, the relative concentrations are calculated as if there were no water. Therefore, the dry weight is exclusively water. The term "wet weight" is intended to refer to the composition which is characterized by moisture content arising from the presence of water. For example, the relative concentration for the wet weight of a component is measured by a total weight that includes water and all other compositional components. The term "nail acceptance" is intended to refer to the ease of hammering a nail into a cementitious construction product. The acceptance of the nail is described by a numerical margin that is defined as follows: 1 refers to a construction product in which a nail can be easily hammered without bending; 2 refers to a construction product of greater hardness so that a nail can be hammered without bending but requires more experience and pressure substantially downward to prevent bending; 3 refers to a construction product having a high level of hardness so that a nail typically bends or deforms using normal hammering action (but can accept a right nail if a conventional nail gun having high force is used) ). As used herein, the term "resistance to extraction" is intended to refer to the amount of force or pressure required to remove a fastening rod, such as a nail or screw, from a substrate such as wood, concrete, and the product. of cementitious inventive construction. Also, the resistance to extraction can be calculated by the force required to extract an IOd nail (eg, a penny 10 nail) embedded 2.54 centimeters (1 inch) in the cured cementitious composite. The resistance to extraction is proportional to the fiber content, all things being equal. As used herein, the term "holding rod" is intended to refer to a nail, screw, bolt, or the like that is configured to form a hole within a substrate while it is inserted therein. Such inserts can be made by hammering, screwing, ballistics, and the like. Additionally, the holding rod can be used to hold a member with another member by the holding rod forming holes while it is being inserted into each member. The construction products of the present invention typically can be drilled using augers for drilling ordinary wood and / or sawing using ordinary wood saws., unlike conventional concrete products that require masonry drills and saw blades. In view of the above definitions, the following discussion sets forth the inventive characteristics of the embodiments of the present invention. II. Compositions Used to Make Extruded Building Products The extrudable cementitious compositions used to make extruded building products in accordance with the present invention include water, hydraulic cement, fibers, a rheology modifying agent, and optionally a setting accelerator and / or aggregates. Cementitious construction products are formulated to have less hardness and compressive strength compared to ordinary concrete, and have greater flexibility, softness, elongation, restraint, and deflection in order to better mimic the properties of real wood. In general, the ratio of tension to compressive strength of the inventive cementitious compounds will be much higher than conventional concrete. In addition, extrudable cementitious compositions and extruded building products prepared therefrom may have some components that are substantially the same as in other multi-component compositions discussed elsewhere. Accordingly, supplementary information can be obtained from the individual components of such multi-component compositions and mixtures as well as some aspects of methods used to manufacture extruded articles and calendered articles thereof in US Patent Nos. 5,508,072, 5,549,859, 5,580,409, 5,631,097 , and 5,626,954, and U.S. Patent Application No. 60/627, 563, which are incorporated herein by reference. However, it should be understood that the construction products of the present invention are substantially stronger and have greater flexural firmness compared to paper-type sheet products manufactured using hydraulic cement but where such sheets were completely dried in a manner of seconds or minutes using a Yankee roller heated significantly above the boiling point of water (for example, 150-300 ° C). The rapid evaporation of water interferes with the hydration of hydraulic cement, thus converting it into a particulate filler instead of a binder. The controlled evaporation of water over a period of several days (at least about 2 days) at a temperature below the boiling point of the water, for example, around 40-80 ° C (100-175 ° F) removes excess water while still allowing hydration of the hydraulic cement binder. The construction products according to the invention are so different from the paper-type sheets that are made using cement as are the two by four and other wood-building products are from ordinary tree paper. In one embodiment, the calendering processes and equipment described in the incorporated references can be used with the compositions described herein. However, the distance of the contact line between the calenders can be adjusted to produce tables or other products that are sized to be used as cementitious construction products (ie, at least about 2 mm, preferably at least about 5 mm, more preferably at least about 1.25 cm, and most preferably at least about 2.5 cm), (at least about 1/8 inch, preferably at least 1/4 inch, more preferably at least 1/2 inch, and most preferably at least 1 inch). For example, the process described in U.S. Patent No. 5,626,954 can be modified to calender larger materials to produce wood-like boards, such as two per four, one per tens, and the like. Also, the benefits of the calendering process can be used to prepare wooden boards of any length, such as lengths that are essentially impossible to obtain from real wood. This may allow inventive wood-type boards to be manufactured to have the usual cross-sectional areas and lengths, such as lengths of 2,438 meters 20.32 centimeters (8 feet 8 inches), 12,192 meters (40 feet), 18,288 meters (60 feet) ), and 24,384 meters (80 feet). A. Hydraulic Cement Extrudable cementitious compositions and cementitious construction products include one or more types of hydraulic cement. As will be discussed later, while the rheology modifier may contribute a greater part of the resistance to the extrudable composition and to the unprocessed extrudate, the hydraulic cement may contribute a greater part of the strength to the cementitious compound or product of construction after that the curing or dehydration begin. Examples of hydraulic cements and associated properties and reactions can be found in the incorporated references throughout the manufacturing process as well as in the finished fiber reinforced construction product. For example, hydraulic cement may be white cement, gray cement, aluminate cement, type I-V cement, and the like. The extrudable composition can include various amounts of hydraulic cement, usually, the amount of hydraulic cement in an extrudable composition is described as a wet percentage (eg, wet wt% or% wet volume) to represent the water that is present. As such, the hydraulic cement can be present from about 25% to about 75% by wet weight, more preferably from about 35% to about 65% by wet weight, and most preferably from about 40% to 60% wet weight of the extrudable composition. Briefly, inside the extruded product, the hydraulic cement forms a gel or a cement paste when reacting with water, where the speed of the reaction can be greatly increased through the use of setting accelerators, and the physical and The strength of the cementitious construction product is modulated by a high concentration of fibers. Usually, the amount of hydraulic cement in a cured cementitious compound is described as a dry percentage (e.g.,% dry weight or% dry volume). The amount of hydraulic cement may vary in a range from about 40% to about 95% dry weight, more preferably from about 50% to about 80% dry weight, and most preferably from about 60% up to about 75% dry weight. It must be recognized that some products may use more or less hydraulic cement, as needed and depending on another constituent. Hydraulic cement, more specifically cement or hydraulic paste formed by reacting or hydrating with water, will typically contribute at least about 50% of the overall adhesive strength of the inventive building products, preferably at least about 70% , more preferably at least about 80%, and most preferably at least about 90% of the adherent force as a whole. This is a direct result of maintaining a relative water-to-cement ratio that is not very effective (for example, by one or more of the first controlled heatings to slowly remove a portion of water by evaporation and / or water absorption by fibers and / or agent rheology modifier B. Water In one embodiment, water can be used in relatively high amounts within the extrudable composition to increase the mixing rate, extrusion capacity, cure rate and / or porosity of the finished extruded products. adding more water has the effect of reducing the compressive strength, this can be a desirable by-product in order to produce a product that can be sawn, sanding, nailed, screwed, and otherwise used as wood or as a substitute for wood. Additionally, high concentrations of water in the extrudable or extrudable composition can be reduced by evaporation or heating. When the water evaporates from the unprocessed extrudate, the stability of shape and porosity can increase simultaneously. This is in contrast to typical concrete compositions and methods, in which increasing porosity decreases unprocessed strength, and vice versa. Accordingly, the amount of water within the various mixtures described herein can be drastically varied within a large range. For example, the amount of water in the extrudable composition and the unprocessed extrudate can range from about 25% by wet weight to about 75% by wet weight, more preferably from about 35% to about 65% , and more preferably from about 40% to about 60% wet weight. On the other hand, the cured compound or hardened construction product may have free water at less than 10% by wet weight, more preferably less than about 5% by wet weight, and most preferably less than about 2% by weight of water in wet weight; however, the additional water can be combined with the rheology, fibers or aggregates modifier. The amount of water in the extrudate during the rapid reaction period should be sufficient to cure or hydrate to provide the finished properties described herein. However, maintaining a relatively low water to cement ratio (ie, a / c) increases the strength of the final cementitious construction products. Therefore, the ratio of water to nominal or real cement will typically be from a margin initially from about 0.75 to about 1.2. In some instances the ratio of water to nominal or real cement may be greater than 1.5 or 1.75 in order to produce construction products that have very high porosity and / or less hardness and ability to saw, nail and / or screw increased. The ratio of water to cement affects the final strength of the hydraulic cement binder. The controlled removal of water by evaporation (for example, over a period of days, such as at least about two days) not only increases the unprocessed strength in the short term, it can increase the long-term strength of the cement binder reduce the ratio of water to cement. Additionally, water can be used to provide porosity to the finished product by being present during the formation process and then by rapidly removing a portion of the water. Rapid water removal can result in voids in the finished product to increase porosity. Also, this can decrease the amount of water, increase the strength of the binder, and provide a ratio of the correct resistance of water to binder. The ratio of water to cement followed by evaporation controlled by heating will preferably be less than about 0.5 (ie, in a range of about 0.1 to about 0.5, preferably about 0.2 to about 0.4, more preferably around 0.25 to around 0.35, and most preferably around 0.3). The amount of water is also selected in order to produce a construction product having a desired density. Because the ability to saw, nail or screw to cementitious construction products according to the invention refers to the density (ie, the lower the density, the easier it is to saw, nail and / or screw the compound using ordinary woodworking tools), the amount of water can be selected to produce a product that has a desired level of porosity. In general, increasing the amount of water that is removed by evaporation before, during or subsequent to curing reduces the density of the final cured building product. In the case where it is desirable that the construction products have properties similar to those of wood, it will preferably be that the density is less than about 1.2 g / cm3, more preferably less than about 1.15 g / cm3, even more preferably less than about 1.1 g / cm3, and more preferably less than about 1.05 g / cm3. In addition to having wood-like properties that allow sawing, nailing and screwing using customary woodworking tools, the construction materials according to the invention can be finished using a convolver and a trowel. C. Fibers The extrudable composition and the extruded construction products include a relatively high concentration of fibers compared to conventional concrete compositions. In addition, the fibers are typically substantially homogeneously dispersed throughout the cementitious composition in order to maximize the beneficial properties imparted by the fibers. The fibers are present in order to provide structural reinforcement to the extrudable composition, the unprocessed extrudate, and the cementitious construction product. The fibers also provide nail and screw grip by providing a rebound effect, imparting micro-level stiffness, avoiding the formation of cracks or catastrophic failure at the micro level around the hole formed by the nail or screw. Fibers that can absorb substantial amounts of water (for example, wood, plant or other cellulose-based fibers) can be used to reduce the effective water / cement ratio (ie, based on water that is actually available for hydration of the water). cement). Various types of fibers can be used in order to obtain specific characteristics. For example, the cementitious compositions may include naturally occurring organic fibers extracted from hemp, cotton, trunk or plant leaves, hardwoods, softwoods, or the like, fibers made from organic polymers, examples of which include polyester nylon (i.e. polyamide), polyvinylalcohol (PVA), polyethylene, and polypropylene, and / or inorganic fibers, examples of which include glass, graphite, silica, silicates, micro glass made of alkali resistant using borax, ceramics, carbon fibers, carbides, metal materials, and similar. Preferred fibers, for example, include glass fibers, ollastonite, abaca, bagasse, wood fibers (e.g., soft pine, southern pine, spruce, and eucalyptus), cotton, silica nitrite, silica carbide, nitrite silica, tungsten carbide, and kevlar; however, other types of fibers can be used. The fibers used in making the cementitious compositions can have a high length-to-width ratio (or "ratio between dimensions") because the narrower, larger fibers typically impart more strength per unit weight to the finished construction product. The fibers may have an average aspect ratio of at least about 10: 1, preferably at least about 50: 1, more preferably at least about 100: 1, and more preferably greater than about 100: 1. 200: 1. In one embodiment, the fibers can be used in various lengths, such as, for example, from about 0.1 cm to about 2.5 cm, more preferably from about 0.2 cm to about 2 cm, and most preferably about 0.3 cm up to about 1.5 cm. In one embodiment, the fibers can be used in lengths of less than about 5 mm, more preferably less than about 1.5 mm, and more preferably less than about 1 mm. In one embodiment, very long or continuous fibers can be dosed to the cementitious compositions. As used herein, "a long fiber" is intended to refer to a long thin synthetic fiber that is longer than about 2.5 cm. As such, a continuous fiber may be present with lengths ranging from about 2.5 cm to about 10 cm, more preferably about 3 cm to about 8 cm, and most preferably from about 4 cm to around 5 cm. The concentration of fibers within the extrudable cementitious compositions can vary widely in order to provide various properties to the extruded composition and the finished product. Generally, the fibers may be present in the extrudable composition in the range from about 2% to about 50% by wet weight within the composition, more preferably from about 5% to about 40%, and even more. preference from about 8% to about 30%, and most preferably about 10% to about 25% by wet weight. The concentration of fibers within the cured cementitious compounds may range from about 3% to about 65% by dry weight, more preferably from about 5% to about 50%, and even more preferred from around from 8% to around 40%, and more preferably around 10% to around 30% by dry weight. In another embodiment, the fibers may be present in greater than about 10% by dry volume, preferably greater than about 15% by dry volume, more preferably greater than 20% by dry volume, even more preferably greater than around 25% by volume, and more preferably greater than about 30% by dry volume. Additionally, specific types of fibers can vary in quantity in the compositions. Accordingly, PVA may be present in a cementitious composition cured to about 5% by dry weight, more preferably from about 1% to about 4%, and most preferably from about 2% to about 3.25%. Soft and / or wood may be present in a cured cementitious composition in amounts described above with respect to the general fibers or present up to about 10% by dry weight, more preferably up to about 5% by dry weight, and more preferably up to about 3.5% dry weight. The newspaper fibers may be present in a cured cementitious composition in amounts described above with respect to the general fibers or present up to about 35% by dry weight, more preferably from about 10% to about 30% by dry weight, and more preferably from about 15% to about 25% dry weight. In one embodiment, the type of fiber can be selected based on the desired structural characteristics of the finished product that is comprised of the cementitious construction product, where it may be preferred to have dense synthetic fibers compared to light natural fibers or vice versa. Typically, the specific gravity of wood or natural fibers has a range from about 0.4 for cherry wood fibers to about 0.7 for birch or mahogany. On the other hand, synthetic fibers can have specific gravities that range from about 1 for polyurethane fibers, about 1.5 for Kevlar fibers, about 2 for graphite and quartz glass, about 3.2 for silicon carbide and Silicon nitrite, around 7 to about 9 for more metals with about 8 for stainless steel fibers, about 5.7 for zirconia fibers to about 15 for tungsten carbide fibers. As such, natural fibers tend to have densities of less than 1, and synthetic fibers tend to have densities from about 1 to about 15. In one embodiment, several fibers of discrepant densities may be used together within the cementitious compositions. For example, it may be beneficial to combine the properties of a cherry wood fiber with a silicon carbide fiber. Accordingly, a combined synthetic / natural fiber system can be used in relation to margins from about 10 to about 0.1, more preferably from about 6 to about 0.2, even more preferably from about 5 to about 0.25, and more preferably around 4 to about 0.5. In one embodiment, a mixture of fibers of long or regular lengths, such as pine, spruce, or other natural fibers, may be combined with micro-fibers, such as ollastonite or micro glass fibers, to provide unique properties, including increased stiffness , flexibility, and flexural strength, with the largest and smallest fibers acting at different levels within the cementitious matrix. In view of the above, the fibers are added in relatively high amounts in order to produce a cementitious construction product having increased tensile strength, elongation, deflection, deformability, and flexibility. For example, the high amount of fiber produces a cementitious construction product which may have a fastening rod inserted therein, with an extraction resistance that resists extraction. The fibers contribute to the capacity of the cementitious construction product of sawing, screwing, sanding and polishing like wood, or the soft part of the fibers can be exposed by polishing to produce a chamois or cloth-like surface. Additionally, the extrudable cementitious composition and cured cementitious composites may include sawdust. While sawdust can be considered to be fibrous, it is usually comprised of a plurality of fibers held together with lignin or other natural agglomerating material. The fibers may provide characteristics to the extrudable cementitious composition or cured cementitious compounds that differ in part from the characteristics provided by true fibers. In some instances, sawdust can function as a filler. Sawdust can be obtained as a byproduct of sawmills and other facilities where wood or lumber products are cut or crushed. The extrudable cementitious composition may include sawdust up to 10% by wet weight, preferably up to 15% by wet weight, more preferably up to 20% by wet weight, and most preferably from about 10% up to about 20% in wet weight. Accordingly, cured cementitious composites can include sawdust up to 12% by dry weight, preferably up to 18% by dry weight, more preferably up to 25% by dry weight, and most preferably from about 12% up to about 20% by weight. 20% dry weight. D. Rheology Modifying Agent In preferred embodiments of the present invention, the extrudable cementitious compositions and the cementitious construction products include a rheology modifying agent ("rheology modifier"). The rheology modifier can be mixed with water and fibers to aid in the distribution substantially uniformly (or homogeneously) of the fibers within the cementitious composition. Additionally, the rheology modifier can impart shape stability to an extrudate. In part, this is because the rheology modifier acts as a binder when the composition is in an unprocessed state to increase the first unprocessed strength so that it can be handled or otherwise processed without the use of molds or other devices. retention of the form. The rheology modifying agent helps control porosity (ie, it produces uniformly dispersed pores when the water is removed by evaporation). In addition, the rheology modifying agent can impart increased toughness and flexibility to a cured composite which can result in improved deflection characteristics. Therefore, the rheology modifier cooperates with other compositional components in order to achieve a more deformable, flexible, foldable, compactable, stiff, and / or elastic cementitious construction product. For example, variations in type, molecular weight, degree of branching, amount, and distribution of the rheology modifier can affect the properties of the extrudable, extruded, unprocessed composition, and cementitious construction products. As such, the type of rheology modifier can be any polysaccharide, protein material, and / or synthetic organic material that is capable of being or providing the rheological properties described herein. Examples of some suitable polysaccharides, particularly cellulosic ethers, include methylhydroxyethylcellulose, hydroxymethylethylcellulose, carboxymethylcellulose, methylcellulose, ethylcellulose, hydroxyethylcellulose, and hydroxyethylpropylcellulose, starches such as amylopectin, amylose, starch acetates, hydroxyethyl starch ethers, ionic starches, polysaccharide gums such as SEAgel, alginic acid, phycocolloids, agar, gum arabic, guar gum, locust bean gum, karaya gum, tragacanth gum, and the like. Examples of some protein materials include collagens, casein, biopolymers, biopolyesters, and the like. Examples of synthetic organic materials that can impart rheology-modifying properties include petroleum-based polymers (eg, polyethylene, polypropylene), die-cutters (e.g., styrene-butadiene), and biodegradable polymers (e.g., aliphatic polyesters, polyhydroxyalkanoates, polylactic acid , polycaprolactone), polyvinyl chloride, polyvinyl alcohol and polyvinyl acetate. The clay could also act as a rheology modifier to help disperse the fibers and / or impart shape stability to the unprocessed extruded composition.

The amount of rheology modifier within the extrudable composition and cementitious construction product can vary from low to high concentrations depending on type, branching, molecular weight, and / or interactions with other compositional components. For example, the amount of rheology modifier present in the extrudable cementitious compositions can range from about 0.1% to about 10% by wet weight, preferably from about 0.25% to about 5% by wet weight, yet more preferably around 0.5% to about 5%, and more preferably from about 1% to about 3% in wet weight. The amount of rheology modifier present in cured cementitious compositions can range from about 0.1% to about 20% dry weight, more preferably from about 0.3% to about 10% dry weight, even more preference around 0.75% up to about 8%, and more preferably about 1.5% up to about 5% dry weight. Additionally, examples of synthetic organic materials, which are plasticizers usually used in conjunction with the rheology modifier, include polyvinyl pyrrolidones, polyethylene glycols, polyvinyl alcohols, polyvinylmethyl ethers, polyacrylic acids, polyacrylic acid salts, polyvinylacrylic acids, salts of polyvinylacrylic acid, polyacrylimides, polymers of ethylene oxide, polylactic acid, synthetic clay, styrene-butadiene copolymers, die-cutting, copolymers thereof, mixtures thereof, and the like. For example, the amount of plasticizers in the composition can range from no plasticizer to about 40% plasticizer by dry weight, more preferably from about 1% to about 35% plasticizer by dry weight, even more preferred from about 2% to about 30%, and more preferably from about 5% to about 25% dry weight. The rheology modifying agent will typically impart less than 50% of the overall adhesive strength of the inventive building products. However, they can indirectly increase the strength of the cement paste by reducing the effective water / cement ratio. The water that is combined by the rheology modifying agent is generally not readily available for hydration of the hydraulic cement joint, thus reducing the overall amount of water that is available for the hydration of the cement. E. Filling In one embodiment, the extrudable, extruded, unprocessed, and cured composite composition may include fillers. Alternatively, there are instances where filler materials are specifically excluded. Fillers, if used, are generally included in smaller quantities and mainly to decrease the cost of extruded products. Because it is desired to obtain extruded products in the form of wood-like building material having the properties of wood, the fillings must be selected so that they do not produce a product that is too hard and difficult to work with. Examples of fillers include expanded clays, perlite, vermiculite, kaolin, wollastonite, diatomaceous earth, limestone, plastic spheres, glass spheres, granulated rubber, granulated plastic, exfoliated vermiculite, talc, mica, and of course sand are more preferable because they decrease the weight and density of the cementitious construction product. Some fillers, such as vermiculite and plastic spheres, have elasticity, and can provide elastic rebound to provide better clamping force to a clamping rod. Others, such as pearlite and glass spheres, are friable, which causes them or allows them to collide when driven in a holding rod, thereby increasing or providing friction to resist extraction. In the incorporated references, additional information can be obtained with respect to the types and amounts of fillers that can be used in the cementitious compositions. ? fillers such as exfoliated vermiculitetalc and mica can be given the form of plates, and can be longitudinally aligned within the extruded unprocessed by the extruder. In one embodiment, the extrudable cementitious compositions may include a widely varying amount of fillers. Specifically, when used, each of the fillers may independently be present less than about 10% by wet weight, preferably less than about 7% by wet weight, more preferably less than about 3% by wet weight, and more preferably between about 2% to about 12% by wet weight. In one embodiment, the cured cementitious compositions may include a widely varying amount of fillers. Specifically, when used, each of the fillers may independently be present less than about 15% by dry weight, preferably less than about 10% by dry weight, more preferably less than about 5% by dry weight, and more preferably between about 3% to about 15% dry weight. In some instances, fillings such as limestone may be present up to about 70% dry weight. For example, when included in a cured cementitious composition, vermiculite can be present from about 2% dry weight to about 20% dry weight, and preferably from about 3% dry weight to about 16% in dry weight. F. Other Materials In one embodiment, a setting accelerator may be included in the extrudable, extruded, unprocessed composition and cementitious construction product. As described herein and in the incorporated references, the setting accelerator can be included to decrease the duration of the induction period or accelerate the start of the rapid reaction period. Accordingly, traditional setting accelerators such as MgCl2, NaC03, KC03 CaCl2 and the like may be used, but may result in a decrease in the compressive strength of the cementitious construction product.; however, this can be a desirable by-product in order to produce a product that can be sawed, sanded, nailed, and screwed like wood. For example, traditional setting accelerators may be present in the unprocessed extrudate from about 0.001% to about 5% by total dry weight, more preferably from about 0.05% to about 2.5% by dry weight, and from greater preference from about 0.11% to about 1% dry weight. In one embodiment, the setting accelerator includes a hydrate-silicate-calcium (C-S-H). The C-S-H can be prepared by forming a precipitate of CaO-SiO2-H20 by adding together aqueous solutions of Ca (N03) 2 and NaSiC > 3 at room temperature and when forming a precipitate. Additional details of the preparation and use of such a setting accelerator of C-S-H can be obtained in US Provisional Application No. 60 / 627,563, previously incorporated for reference. Additionally, an increase in the amount of setting accelerator of C-S-H substantially can not decrease the compressive strength of the cementitious construction product. For example, CSH may be present in the unprocessed extrudate from about 0.01% to about 15% by total dry weight, more preferably from about 0.5% to about 10% by dry weight, and most preferably from about 1% up to about 5% dry weight. Therefore, the amount of setting accelerator of C-S-H dosed to the extrudable composition may be greater than the amount of traditional setting accelerators without jeopardizing the strength of the finished product. Additionally, it may be favorable to combine the properties of traditional setting accelerators with CSH, where the ratio of traditional setting accelerator to CSH can range from about 0.2 to about 5, more preferably from about 0.25 to about 4, and more preferably from about 0.5 to about 2. Alternatively, the amount of setting accelerator of CSH or the corresponding concentrations of calcium and silicate can be maintained or varied only slightly throughout the induction period and the period of time. fast reaction to remain substantially constant in the final cured cementitious construction product. In one embodiment, the cementitious compositions may include an additive material. Alternatively, there are instances where additive materials are specifically excluded. The additives, if they are used, are generally included in smaller quantities and mainly to reduce the cost of the extruded products. In some instances, the additives can be used to modify the strength of the cured product. Some examples of additives can be pozzolanic materials that react with water, have a high pH, and are a bit cementitious. Examples of pozzolanic materials include pozzolanic ash, slate, loose ash, silica fume, and the like. Additionally, the cementitious compositions may include dyes or pigments to alter the color or provide products of cementitious compound with the usual color. Dyes or pigments that are routinely used in cementitious compositions can be applied to the present invention. Other specific materials that may be present in the cementitious compositions may include guar gum, daravair, Ti02, delvo, glenium 30/30, LatexAc 100, pozzilith NC534, and other similar materials. For example, Ti02 may be present from about 0.5% to about 1.5% dry weight, preferably from about 0.7% to about 1.3% dry weight; the delve may be present from about 0.05% to about 0.5% dry weight, preferably from about 0.06% to about 0.37% dry weight; glenium 30/30 may be present from about 0.25% to about 0.5% dry weight, preferably from about 0.3% to about 0.4% dry weight; LatexAc 100 may be present from about 0.75% to about 3% dry weight, preferably from about 0.95% dry weight to about 2.80% dry weight; and pozzilith NC534 may be present from about 1.25% to about 2% by dry weight, preferably from about 1.4% to about 1.5% by dry weight. In one embodiment, the cementitious compositions may include additional optional materials such as dispersants, polymeric binders, nucleating agents, volatile solvents, salts, polishing agents, acidic agents, coloring agents, and the like. Specifically, when used, each of these additional optional materials, some of which are discussed in the incorporated references, may be independently present in less than about 10% by dry weight, more preferably less than about 5% by weight. dry weight, and more preferably less than about 1% dry weight. In one embodiment, a substantially cured cementitious extrudate that is reinforced with fibers may be covered with a protective or sealant material such as a paint, dye, varnish, texturizing coating, and the like. As such, the coating can be applied to the cementitious construction product after it is substantially cured. For example, the cementitious construction product may be dyed so that the fibers present on the surface have a different shade from the rest of the product, and / or are textured to resemble a wood product. Sealants known in the concrete industry can be applied to the surface and / or incorporated into the cementitious matrix in order to provide waterproofing properties. These include silanes and siloxanes. In addition, the C-S-H particles can be applied to the surface and / or mixed into the matrix to provide a waterproofing characteristic. The precipitated hydrated cement paste can also be applied to the surface to provide waterproofing or other protection. III. Manufacturing Construction Products Figure 1 is a schematic diagram illustrating one embodiment of a manufacturing system and equipment that can be used during the formation of an extrudable, extruded, unprocessed composition, cementitious compound, and / or construction product. It should be recognized that this is only an illustrated example for the purpose of describing a general processing system and equipment, where various additions and modifications can be made thereto in order to prepare the cementitious compositions and inventive building products. Also, the schematic representation should not be construed in any way limiting the presence, disposition, form, orientation, or size of any of the features described in relation thereto. With that said, a more detailed description of the system and equipment that can be prepared by the cementitious compositions as well as the cementitious construction products that are in accordance with the present invention is now provided. Referring now to Figure 1A, which describes one embodiment of an extrusion system 10 according to the present invention. Such an extrusion system 10 includes a first mixer 16, second optional mixer 18, and an extruder 24. The first mixer 16 is configured to receive at least one supply of materials through at least one first supply stream 12 for mixing in a first mix 20. After mixing properly, which can be done under high shear, while maintaining a temperature below that which accelerates hydration, the first mix 20 is removed from the first mixer 16 since the flow of material is ready for other processing. 1 mixing the first mixture 20 apart from any additional components, the respective mixed components can be distributed homogeneously throughout the composition. For example, it may be advantageous to mix the fibers homogeneously with at least the rheology and water modifier before combining them with the additional components. As such, the rheology modifier, fibers, and / or water are mixed under high shear stress to increase the homogeneous distribution of the fibers therein. The rheology and water modifying agent form a plastic composition having high load of remaining deformation and viscosity which is capable of transferring the shear forces of the mixer down to the fiber level. In this way, the fibers can be dispersed homogeneously throughout the mix using much less water than is required in traditional Hatschek and papermaking processes, which typically require up to 99% water to disperse the fibers. The second optional mixer 18 has a second supply stream 14 which supplies the material to be mixed in a second mixture 22, where said mixture can be improved by the incorporation of a heating element. For example, the second mixer 18 can receive and mix additional components, such as additional water, setting accelerators, hydraulic cement, plasticizers, aggregates, nucleating agents, dispersants, polymeric binders, volatile solvents, salts, polishing agents, acidic agents , coloring agents, fillers, and the like before combining them with other components to form an extrudable composition. The second mixer 18 is optional because the additional components can be mixed with the fibrous mixture in the first mixer 16. As in the illustrated schematic diagram, the extruder 24 includes a screw 26 of the extruder, optional heating elements (not shown), and a die holder 28, with a die opening 30. Optionally, the extruder can be a single screw, double screw, and / or a piston type extruder. After the first mixture 20 and second mixture 22 enter the extruder can be combined and mixed in an extrudable composition.

By mixing the components, an interrelation is created between the different components, such as rheology modifying agent and fibers, w allows the individual fibers to separate from each other. By increasing the viscosity and production pulse with the rheology modifying agent, more fibers can be substantially homogeneously distributed throughout the mixture and final cured product. Also, the cohesion between the different ones can be increased to increase capillary and interparticle strengths for improved mixing and shape stability after extrusion. For example, the cohesion between the different components can be compared with the clay so that the unprocessed extrudate can be placed on a pottery wheel and worked in a similar way to the common clays that are made in pottery. In one embodiment, additional supply streams (not shown) can be located at any position along the length of the extruder 24. The availability of additional supply streams can allow the manufacturing process to aggregate certain components at any position to modify the characteristics of the extrudable composition during mixing and extrusion as well as the characteristics of the unprocessed extrudate after extrusion. For example, in one embodiment it may be advantageous to supply the setting accelerator to the composition within about 60 minutes to within about 1 second before being extruded, especially when it is C-S-H. More preferably, the setting accelerator is mixed in a composition within about 45 minutes to about 5 seconds before being extruded, still more preferably within about 30 minutes to about 8 seconds, and most preferably within about 20 minutes to about 10 seconds before extruding. This allows the unprocessed extrudate to be configured for increased shape stability and a shortened induction period before the start of the rapid reaction period. Accordingly, the postextrusion induction period can be substantially shortened to induce the start of the rapid reaction period to begin within about 30 seconds to about 30 minutes after extrusion, more preferably less than about 20 minutes, even more. preferably less than about 10 minutes, and more preferably less than about 5 minutes after extrusion. In another embodiment, the setting accelerator can be supplied separately to the extruder from the other components so that the induction period has a duration of less than about 2 hours, more preferably less than 1 hour, even more preferably less than about 1 hour. 40 minutes, and more preferably less than 30 minutes. With continued reference to Figure 1A, while the cementitious composition moves to the end of the extruder 24, it passes through the die holder 28 before being extruded into the opening 30 of the die. The die holder 28 and the die aperture 30 can be configured in any form or arrangement until an extrudate is produced that is capable of further processing or finishing in a construction product. In the illustrated embodiment, it may be of advantage for the opening 30 of the die to have a circular diameter so that the extrudate 32 has a rod-like shape. Other exemplary cross-sectional shapes are illustrated in Figure 1C, including hexagonal 42, rectangular 44, square 46, or I-beam 48. Extruded construction products can be characterized as immediately having a stable shape while in the unprocessed state. That is, the extrudate can be processed immediately without being deformed, wherein the processing may include cutting, sawing, shaping, grinding, forming, drilling, and the like. As such, the extrudate in the unprocessed state does not need to be cured before being prepared in the size, shape, or shape of the finished cement product. For example, processing of unprocessed state may include the following: (a) creating tables, by means of shredding, sawing, cutting or the like, having specific dimensions, such as width, tness, length, radius, diameter, and the like; (b) folding the extrudate to form a curved cementitious product, which may be any size and shape, such as a curved chair leg, curved arches, and other structural and / or ornamental members; c) create tables that have lengths that exceed or are different from the standard wood board lengths, which may include shorter or longer board lengths of 1,829 meters, 22.86 centimeters (6 feet 9 inches), 2,438 meters, 20.32 centimeters ( 8 feet 8 inches), 2,743 meters 2.54 centimeters (9 feet 1 inch), 8.23 meters (27 feet), 12,192 meters (40 feet), 12,497 meters (41 feet), 18,288 meters (60 feet), 18,593 meters (61 feet) ), 24,384 meters (80 feet), 24,689 meters (81 feet), and the like; (d) texturizing with rollers, which can impart wood grain surfaces to the cementitious construction product; (e) having the surface painted, waterproofed, or otherwise covered, which may apply coatings comprising silanes, siloxanes, die cut, C-S-H, and the like; and (f) transported, shipped, or otherwise moved and / or handled. Also, byproducts that are produced from unprocessed state processing can be placed in the supply compositions and reprocessed. Therefore, unprocessed cementitious byproducts can be recycled, which can significantly reduce manufacturing costs. Figure IB is a schematic diagram of a die holder 29 that can be used with the extrusion process of Figure 1A. As such, the die holder 29 includes a die opening 30 having an orifice-forming member 31. The orifice forming member 31 may be circular as shown, or have any shape in cross section. As such, the orifice forming member 31 can form a hole in the extrudate, which is described in Figure 1C. Since the extrudate can have a stable shape immediately in the extrusion, the orifice can retain the size and shape of the orifice-forming member 31. Additionally, various carriers having orifice forming members that can produce annular extrusions are well known in the art and can be adapted or modified, if necessary, to be useful with the extrusion processes according to the present invention. Referring now to Figure 1C, additional embodiments of extrudates 40 are described. Accordingly, the die holder and die aperture of Figure 1A or IB can be modified or altered to provide extrudes 40 having several areas in cross section, where the area in cross section of the extrudate 40 may be substantially the same as the cross-sectional area of the die opening. For example, the cross-sectional area may be a hexagon 42, rectangle 44 (eg, two by four, one by ten, etc.), square 46, beam I 48, or a cylinder 50, optionally having a hole 49 continuous. Also, additional cross-sectional shapes can be prepared by extrusion. More particularly, the die holder and die opening of Figure IB can be used so that the hexagon 42, rectangle 44 (eg, two by four, one by ten, etc.), square 46, beam I 48, or cylinder 50 can optionally include continuous circular holes 51, rectangular holes 53, square holes 57, or the like. Also, complex portals and openings can be used to prepare the cylinder 50 having the continuous orifice 49 and a plurality of smaller orifices 51. In addition, any general cross-sectional shape can be further processed in a specific form such as, for example, a two-by-four of a four-by-four square shape. Alternatively, the die orifice can produce large products that are then cut to the desired specifications in order to ensure greater uniformity. Accordingly, the above processes may be useful for extruding construction products with one or more continuous holes. For example, a two by four or other table can be extruded by having one or more holes to which the rebar can be inserted, either while in an unprocessed state or after curing. In the case of a cured board, the reinforcement bar can be held in place within the hole using epoxy or other adhesive to provide a strong bond between the reinforcement bar and the board. For example, the cylinder 50 of Figure 1C, as well as the other shapes, can be manufactured in large construction structures, such as public utility poles, telephone, or light cables. These structures may optionally include a large interior opening 49 to reduce mass and cost, along with smaller holes 51 in the wall to allow the insertion of the reinforcing bar that strengthens, as shown. In one embodiment, a wooden telephone pole has an outer diameter of about 35.56 centimeters (fourteen inches), a wall thickness of about 7.62 centimeters (three inches), and an inner hole diameter of about 20.32 centimeters ( eight inches). The plurality of holes of 1.27 centimeters (half an inch) apart can be provided within the wall of 7.62 centimeters (three inches) in order to accommodate the placement of the rebar. In one embodiment, the extrudable composition is deaerated before being extruded. While some processes can employ a specific deaeration process to remove a substantial amount of air from the extrudable composition, other processes can remove air through the mixing process that occurs in the extruder. In any case, passive or active deaeration can provide an extrudate that does not have large air voids or cellular formations. For example, a deaerated cementitious compound may have a dry porosity of from about 15% to about 60%, more preferably from about 20% to about 55%, and most preferably from about 25% to about 50% . Therefore, the resulting extruded and cementitious construction product can be manufactured to substantially or completely lack any multicellular formation. In one embodiment, the extrudable composition is aerated prior to extrusion. Some processes may employ an active aeration process to increase the amount of air in the extrudable composition and thereby form air voids or multicellular formations, wherein such processes may include blowing pressurized air into the composition within the extruder or mixing fresh air. Other compositions can be passively aerated simply by not actively deaerating. Additionally, quickly removing the water from the extrudate can also increase the porosity of the finished product, which can be done in a dryer or other heating chamber. In any case, active or passive aeration can provide an extruded and / or cementitious construction product having small to large air voids or cellular formations. For example, a deaerated cementitious composite can have a porosity of from about 40% to about 75%, more preferably from about 45% to about 65%, and most preferably from about 50% to about 60%. Therefore, aerating or deaerating the extrudable composition can provide the ability to increase or decrease the density of the cementitious construction product. Accordingly, the porosity of a cementitious construction product can be adapted to specific and customary needs. This may allow the manufacturing process to be adapted to provide a porosity that correlates with the intended use of the cementitious construction product. For example, wood type boards can be configured to have higher porosities, which allows nailing, screwing, cutting, drilling, grindingit. , saw better, and similar. As such, the increased porosity can be used to improve the wood-like properties of the cementitious material. Therefore, the porosity together with the fiber content can be modified to correlate with intended uses.

In one embodiment, the extrudate can be further processed in a dryer or autoclave. The dryer can be used to dry the extrudate so that excess water is removed, which can increase the porosity and / or shape stability. On the other hand, the extrudate can be processed through an autoclave in order to increase the curing speed. Figure 2 is a schematic diagram describing an alternative extrusion process that can be used to prepare the cementitious construction products according to the present invention. As such, the extrusion process can be considered to use a roller extrusion system 200 which uses rollers to extrude the wet cementitious material in an unprocessed extrudate. Such roller extrusion system 200 includes a mixer 216 configured to receive at least one supply of materials through a supply stream 212 to be mixed in a mixture 220. After suitable mixing, which can be performed as described in FIG. present, the mixture 220 is removed from the mixer 216 since the material flow is ready for further processing. The mixture 220 is then applied to the conveyor 222 or other similar conveyor to move the material from the place of application. This allows the mixture to be formed in a cement flow 224 that can be processed. As such, the cement flow 224 can be passed under a first roll 226 which is set at a predefined distance from the conveyor 222 and which has a predefined cross-sectional area with respect to it, which can press or shape the cement flow 224 in an extruded 228 unprocessed. Optionally, the conveyor 222 can distribute the unprocessed extrudate 228 through a first calender 230 which is comprised of an upper roll 230a and a lower roll 230b. The calender 230 can be configured to have a predefined cross-sectional area so that unprocessed extrudate 228 is shaped and / or further compressed into an unprocessed extruded 242 formed. Also, a second compressed optional calender 240 of a first roller 240a and a second roller 240b can be used in place of the first calender 230 or in addition thereto. A combination of calender 230, 240 may be favorable to provide an unprocessed extrudate substantially given the shape that is desired. Alternatively, the first roll 226 can be excluded and the cement flow 224 can be processed through any number of calenders 230, 240. Additionally, the unprocessed extrudate 242 formed, or other extrudate described herein, such as from the processes illustrated in FIG. Figure 1A can be processed further by a processing apparatus 244. The processing apparatus 244 may be any type of equipment or system that is employed to process the raw extrudate materials as described herein. As such, the processing apparatus 244 may be sawing, grinding, cutting, bending, covering, drying or otherwise further shaping or processing the unprocessed extrudate 242 formed in a processed extrudate 246. Also, the byproduct 260 obtained from the processing apparatus 244 can be recycled into the supply composition 212, or applied to the conveyor 222 together with the mixture 220. When the processing apparatus 244 is a dryer, the unprocessed extrudate 242 formed can be heated to a temperature that rapidly removes the water to form voids in the processed extrudate 246, which increases the porosity. In one embodiment, the processed extrudate 246, or other extrudate described herein, can be cured by processing through an autoclave 248 or dryer. As such, the autoclave 248 or dryer can raise the temperature of the processed extrudate 246 and surrounding humidity to induce the start of the hydration reaction. Therefore, the autoclave 248 or dryer can quickly cure the processed extrudate 246 in a cured cementitious construction product 250. For example, the autoclave 248 can provide a steam cure when operated at a temperature of about 60-65 ° C for about 24 hours in order to obtain 75% of the final strength. A conventional dryer can then be used to remove residual water. Optionally, the extrudate can be covered with plastic and / or stored for a period of time to allow the extrudate to cure. This may allow the extrudate to harden over time in order to produce the strength required for the cured cementitious composite product. For example, after 28 days, the cured cementitious product can have about 80% final strength, and can be placed in a dryer to remove residual water. In another option, a combined curing / drying process can be used to cure and dry the extruded cementitious compound. For example, the combined curing / drying process can be carried out at a temperature of 60-65 C for 48 hours in order to obtain about 80% of the final strength. However, larger blocks may take additional time in any curing and / or drying process. According to Figures 3A-D, the extrusion system described in Figure 1A can be modified to be able to extrude the extrudate around a supplementary support member or reinforcing member such as a reinforcing bar (metal or fiberglass ), cable, wire mesh, cloth, and the like. By coextruding the cementitious composition with a reinforcement bar, cloth or reinforcing cable, the resulting cementitious construction product can have a greater resistance to deflection and to bending before being broken. Alternatively, roller extrusion system 200 can be configured to prepare reinforced unprocessed bodies and cementitious construction products as described below. Referring now to Figure 3A, one embodiment of a co-extrusion system 300 is described. The co-extrusion system 300 includes at least two or more carriers 302a and 302b. The carriers 302a and 302b are oriented so that the respective die openings 303a and 303b produce an extrudate that is mixed together in a uniform extrudate 308. Additionally, the coextrusion system 300 includes a means for placing a supplementary support element such as the reinforcing bar 304 within the uniform extrudate 308, wherein the means may include a conveyor, pulley, immersion mechanism, mobile die holder, push of the reinforcement bar, traction mechanism of the reinforcement bar, and the like. As described, the reinforcing bar 304 is passed between the first opening 303a of the punch and the second opening 303b of the punch. This allows the reinforcing bar 304 to be encapsulated at least partially or completely within the uniform extrudate 308, where the encapsulated reinforcement bar 306 is shown with dashes. As described, the reinforcing bar 304 may have a first end 310 that is oriented through the openings 303a and 303b of the die before any extrudate is applied to the reinforcing bar 304 so that the first end 310 is not encapsulated . The uncovered reinforcing bar can allow the reinforcing bar to pull through the openings 303a and 303b of the die, and facilitates easy handling and post-extrusion handling. Referring now to Figure 3B, another embodiment of a co-extrusion system 320 is described. The co-extrusion system 320 includes a die holder 322 and a means for supplying a metal mesh or fabric mesh 324 to the extrudate 326 wherein the means may include a conveyor, pulley, immersion mechanism, moving die holder, thrust mechanism of the mesh, mesh traction mechanism, and the like. As such, the medium can continuously supply the mesh 324 to the die opening 321 so that the extrudate 326 is extruded around and encapsulates the mesh 324. The encapsulated mesh 328 is represented by the lines within the extruded 326. Additionally, the mesh 324 can be supplied at a speed substantially equivalent to the extrusion rate so that the reinforced extrudate is uniformly formed. Referring now to Figure 3C, another embodiment of a co-extrusion system 340 is described. The co-extrusion system 340 includes a die holder 342 with an opening 348 in the die. The die holder 342 and the die opening 348 are configured so that a supplementary support element 344 (i.e., at least one reinforcement bar) can be passed through the die holder 342 via a channel 346. The channel 346 allows the reinforcement bar 344 is passed through die opening 348 through a channel opening 350. When the reinforcing bar 344 passes through the channel opening 350 it is encapsulated with the extrudate 352 to form the encapsulated reinforcing bar 354. Referring now to Figure 3D, another embodiment of a 360 co-extrusion system is described. The co-extrusion system 360 includes a die holder 362 with an opening 363 of the die and an open mold 364. The open mold 364 is configured to include an open cavity 366 defined by the mold body 368. In use, the open mold 364 receives the supplementary support element 370 such as a metal or fabric mesh, plurality of reinforcing bar or cables within the open cavity 366. This allows the extrudate 374 to be extruded to and around the mesh 370 to form encapsulated 376 mesh, as shown by dashes within the extruder 374. Although the open mold 364 can be used to define the cross-sectional shape of the extruded 374 , it does not necessarily do it. This is because the co-extrusion system 360 can be configured so that the open mold 365 only supports the mesh 376, and passes the mesh 370 through the opening 363 of the die. Therefore, the extruded 374 may be supportive thereto and encapsulate the mesh 370 within the open mold 364 or in some other feature such as a conveyor system, pulley, immersion mechanism, mobile socket, push mechanism of the bar of reinforcement, traction mechanism of the reinforcement bar, and the like (not shown). Figure 4 is a schematic diagram illustrating another embodiment for structurally reinforcing a cementitious construction product with a rebar-like structure. As such, the reinforcement process 400 may use the reinforcement bar 402 prepared from any strengthening material such as metal, ceramic, plastic and the like. The reinforcement bar 402 can then be processed through a processing apparatus 404 that applies an epoxy coating 406 to the reinforcing bar 402. A cementitious product 408 having a continuous orifice 410 formed therein, such as by the processes described in relation to Figure IB, can be obtained to receive the reinforcing bar 402 covered with epoxy 406. The reinforcement bar 402 covered with epoxy 406 is then inserted into the orifice 410. This may include driving, pressing, or otherwise forcefully pushing the epoxy-coated 406 reinforcing bar 406 into the hole. Accordingly, the cementitious product 408 having the reinforcing bar 402 can be significantly strengthened and structurally reinforced. Alternatively, the epoxy can be inserted into the orifice 410 of the cementitious product 408 before the reinforcing bar 402 is inserted therein. In one embodiment, the unprocessed extrudate with or without a supplemental support element can be further processed by causing or allowing the hydraulic cement within the unprocessed extrudate to be hydrated or otherwise cured to form a solidified cementitious construction product. As such, the cementitious construction product can be prepared to have an immediate stable form after extrusion to allow handling thereof without breaking. More preferred, the unprocessed cementitious or extruded composition may have a stable form within 15 minutes, more preferably within 10 minutes, still more preferably within 5 minutes, and more preferably within 1 minute after extrusion. The most optimized and preferred composition and processing can result in an unprocessed extrudate having stable form in the extrusion. The use of a rheology modifying agent can be used to produce extrudates having an immediate stable form even in the absence of hydration of the hydraulic cement binder. In order to achieve shape stability, the manufacturing process can either simply allow the raw extrudate to set and settle without further processing or it can be caused to hydrate and / or set. When manufacturing includes causing the unprocessed extrudate to hydrate, set or otherwise cure, the manufacturing system may include a dryer, heater or autoclave. The dryer or heater can be configured to generate sufficient heat to remove or evaporate the water from the extrudate to increase its stiffness and porosity or induce the start of the rapid reaction period. On the other hand, an autoclave can provide steam under pressure to induce the start of the rapid reaction period. In one embodiment, the unprocessed extrudate may be allowed or induced to initiate the rapid reaction period as described herein in addition to including a setting accelerator within the cementitious composition. As such, the unprocessed extrudate can be induced to initiate the rapid reaction period by altering the temperature of the extrudate or changing the pressure and / or relative humidity. Also, the rapid reaction period can be induced to set the setting accelerator to initiate the reactions within a predetermined period of time after extrusion. In one embodiment, the preparation of a cementitious compound or product of construction may include substantially hydrating or otherwise curing the unprocessed extrudate in the cementitious construction product within a shortened period, or a faster reaction rate, compared to conventional concretes or other hydraulically forgeable materials. As a result, the cementitious construction product can be cured or hardened substantially, depending on the type of binder being used, within about 48 hours, more preferably within about 24 hours, even more preferably within 12 hours, and more preferably within 6 hours. Therefore, the process and production system can be configured in order to obtain fast curing speeds so that the cementitious construction product can be processed or finished further. In one embodiment, a cured or cured cementitious composition can be further processed or finished. Such processing may include sawing, sanding, cutting, drilling, and / or shaping the cementitious composition in a desired form, wherein the composition gives it such a shape. Accordingly, when a cementitious construction product is sawed, the fibers and rheology modifier can contribute to straight cutting lines that can be formed without cracking or chipping the cut surface or internal aspects of the material. This allows the cementitious construction product to be a substitute for wood because a two-by-four product can be purchased by a consumer and cut with standard equipment in the desired shapes and lengths. In one embodiment, the extruded unprocessed stably can be processed through a system that modifies the outer surface of the product. An example of such modification is passing the unprocessed extrudate through a calender or series of rollers that can impart a wood-like appearance. As such, the cementitious construction product can be a substitute for wood that has the aesthetic appearance and texture of the wood. As well, certain dyes, dyes, and / or pigments can be applied to the surface or dispersed within the cementitious construction product to achieve the color of various types of wood. Unprocessed extruded building products can also be given another shape while in an unprocessed state to produce, for example, curved boards or other construction products having a desired radius. This is a significant advantage over traditional wood products, which are difficult to bend and / or which must be crushed to have a curved profile. In one embodiment, the cementitious construction product can be sanded and / or polished in a manner that exposes the fibers to the surface. Due to the high percentage of fiber in the product, a large amount of fibers can be exposed to the surface. This can provide interesting and creative textures that can increase the aesthetic qualities of the product. For example, the cementitious construction product can be sanded or polished to have a chamois or cloth-like texture or appearance. IV. Construction Products The present invention provides the ability to manufacture cementitious construction products having almost any desired size and shape, either extruded into the desired shape or later cut, crushed or otherwise shaped to the desired size and shape. Examples include cut top, two by four, other wood sizes, boards, imitation plywood, imitation board, doors, shingles, molds, table tops, table legs, window frames, door frame, tiles for ceilings, panel, skirting boards, beams, I beams, floor joists, and the like. Accordingly, the cementitious construction product can withstand loads (for example, two times four) or not withstand loads (for example, cap cut). Therefore, the cementitious construction product can be used as a substitute for wood for almost any application in construction. The cured cementitious composite can be configured to have several properties in order to function as a wood substitute. An example of a cured cementitious compound that can function as a wood substitute can have any of the following properties: capable of receiving nails by hammer and / or ballistic; able to hold or hold nails, especially when connected to another object; able to receive screws by screwdriver or mechanical screwdriver; ability to hold or hold screws, especially when connected to another object; be similar in weight to a wood product, but can be a little heavier; strong enough not to fracture when pulled; strong enough not to deviate significantly at the ends or fracture when held or supported in the middle; and / or capable of sawing or cutting with a handsaw or other handsaw configured to cut wood. In one embodiment, the unprocessed extrudate or the cementitious compound can be prepared in a construction product as described above. As such, a deaerated form of the cured composite cement material may be characterized as having a specific gravity inclusive of pores or the cellular formations may be greater than 0.85 or have a range from about 0.85 to about 2.0, more preferably from about 0.9 to about 1.75, and most preferably around 0.95 to about 1.5. However, in some embodiments a deaerated compound may have specific gravity greater than 2.0 when synthetic fibers are used. On the other hand, when it is not deaerated, the specific gravity of the cured compound including pore or cell formation may be greater than about 0.4 or have a range from about 0.4 to about 0.85, more preferably from about 0.5 to about 0.75, and most preferably from about 0.6 to about 0.75. One embodiment of the cured compound may be characterized as having a compressive strength greater than about 105.46 kgf / cm2 (1,500 psi), more preferably greater than about 123.037 kgf / cm2 (1,750 psi), and more preferably greater than about of 140,614 kgf / cm2 (2, 000 psi). In one embodiment, the cured compound can have a flexural strength from about 11,249,118 kgf / cm2 (160,000 psi) to about 59,760,938 kgf / cm2 (850,000 psi), preferably from about 14,061,397 kgf / cm2 (200,000 psi) to about of 56,245,588 kgf / cm2 (800,000 psi), more preferably from about 210,921 kgf / cm2 (3,000 psi) to about 49,214.89 kgf / cm2 (700,000 psi), and more preferably from about 28,122,794 kgf / cm2 (400,000 psi) ) to around 42,184,191 kgf / cm2 (600,000 psi). In one embodiment, the cured compound can have a flexural modulus of from about 14,061,397 kgf / cm2 (200,000 psi) to about 351,534.93 kgf / cm2 (5,000,000 psi), more preferably from about 21,092,096 kgf / cm2 (300,000 psi) to about 210,920.96 kgf / cm2 (3,000,000 psi), and more preferably from about 35,153,493 kgf / cm2 (500,000 psi) to about 140,613.97 kgf / cm2 (2,000,000 psi). In one embodiment, the cured compound can have an elastic energy absorption from about 875.634475 kg / s2 (5 lbf-pul) to about 8.756.34475 kg / s2 (50 lbf-pul), preferably from about 1,751.26895 kg / s2 (10 lbf-pul) to about 5,253.80685 kg / s2 (30 lbf-pul), more preferably from about 2.101.52274 kg / s2 (12 lbf-pul) to about 4378.172375 kg / s2 (25 lbf-pul), and more preferably from about 2,626.903425 kg / s2 (15 lbf-pul) to about 3.502.5379 kg / s2 (20 lbf-pul). Additionally, the cementitious construction product can be distinguished from previous concrete construction products. Figure 57? discloses a representation of the problems that may arise when inserting (eg, ballistic, hammering, or driving force) a clamping rod 64 (eg, nail or screw) to the surface 62 of such a product 60 of prior concrete construction , wherein the holding rod 64 forms the hole 66 during insertion. Similar to ordinary concrete used in a variety of applications ranging from highways to foundations, when the concrete 60 has a holding rod 64 inserted therein, the structure of the surface 62 is damaged. As described, concrete 60 and / or surface 62 are prone to form cracks 68 and tormos 70 to chip around hole 66. Since concrete 60 is damaged around hole 66, the surface of hole 66 may appear to have a shape irregular or fractured formed by crack, tormos, and / or substantial desportilles. Additionally, the force required to insert a clamping rod 64 into the concrete with a hammer by repeatedly hitting the head of the nail 64 often damages or bends the nail 64, so it is essentially useless. Additionally, when the holding rod 64 is a screw, the screwing action can open a hole 66 in the surface that is punctured with cracks and chips. Therefore, the above concrete construction products 60 had not been suitable wood substitutes with respect to being able to receive a holding rod 64, and they have looked and behaved similarly to ordinary concrete when cracking and chipping during such insertion. . Referring now to Figure 5B, a representation of a cementitious product 80 that is used as a wood substitute according to the present invention is described. Accordingly, the results of inserting a clamping rod 84 (eg, nail or screw) to the surface 82 of the cementitious product 80 are more favorable compared to the ordinary concrete of Figure 5A. More specifically, when a clamping rod 84 is inserted to the surface 82, the resulting hole 86 formed by the clamping rod 84 can have substantially a round shape. While there may be less chipping or cracking as commonly occurs during such inserts to the wood, the orifice 86 is much rounder and less damaged compared to the results of ordinary concrete. Since the cementitious product 80 is configured as a wood substitute, a nail clamping rod 84 can be hammered into it by repeatedly hitting the nail head without damaging or bending the nail 84. In any case, the construction products cementitious materials described herein may be used as a substitute for wood, and may still have a support rod therein. As such, the inventive cementitious construction products can be used to connect multiple piece components together or used for other typical applications for a nail or screw. In addition, Figures 6A and 6B describe another representation 90 of the common results that occur when a clamping rod 94 (eg, nail or screw) is inserted into an ordinary or former concrete construction product 92. When the clamping rod 94 is inserted to the surface 96 of the concrete 92, a hole 95 formed by the insert fractures and is nicked as shown in Figure 4. Accordingly, in Figure 6A the representation 90 describes an exploded view longitudinal of the resultant damage to the ordinary concrete 92, and in Figure 6B the representation 90 describes a cross-sectional view at mid-level of the resulting damaged orifice 95. As shown, the clamping rod 94 not only causes the surface 96 to crack or form rods 98, but also the internal surface 100 of the entire length of the hole 95 to be similarly damaged. More particularly, inserting the clamping rod 94 causes the inner surface 100 to be punctured with cracks 102, crushed concrete 104, and concrete chipping. Although it is possible to insert a clamping rod 94 into the concrete, it often requires some type of explosive or ballistic charge instead of hammering or screwing because ordinary hammering often results in bending a nail clamping rod 94 and screwing significantly damages the surface 100 internal. Additionally, a clamping rod 94 that has been inserted into the ordinary concrete 92 can be easily removed from it, often without the use of a tool or device as described above. Briefly, this is because the damage to the inner surface 100 decreases the compressive forces applied against the gripper rod 94 that are needed to hold it in place. As such, ordinary concrete 92 has a low or low pull-out resistance, and a nail or screw 94 can be easily removed therefrom. This does not allow ordinary concrete 92 to be used as a substitute for wood, and the two pieces can not be properly nailed together without separating easily. In addition, Figures 7A and 7B describe a representation 110 of common results for a clamping rod 112 that is inserted into a fiber reinforced cementitious construction product 114 according to the present invention. In contrast to the representation in Figures 6? and 6B, when the clamping rod 112 is inserted to the surface 115 of the inventive construction product 114, an orifice 116 formed by the insert is not damaged or substantially fractured, which is also shown in Figure 5. Accordingly, the Figure 7? discloses a longitudinal exploded view of the resulting orifice 116, and Figure 7B describes a cross-sectional view at median level of the resulting orifice 116. As shown, the holding rod 112 does not cause any substantial damage to the surface 115, or the surface 118 internal to the entire length of the hole 116. More particularly, inserting the holding rod 112 may cause the fibers 120 on the inner surface 118 to be exposed and deformed or pushed sideways by the holding rod 112. As described, these fibers 120 are deformed or pushed aside to allow the clamping rod 112 to pass, but then exerts a clamping force against the clamping rod 112 after insertion. Additionally, the rheology modifier can provide the construction product to deform by the nail when it is being inserted, and then apply a clamping force against the nail after insertion.

Additionally, the orifice 116 formed by a nail clamping rod 112 is not damaged, and can provide sufficient compressive forces against the nail to resist extraction therefrom. This is because the nail 112 does not damage the wall of the hole 116 during insertion by the fibers and other deforming materials during the formation of the hole 116. Furthermore, when the holding rod 112 is a screw, the wall of the hole 116 can have ridges and notches that interlock with the teeth and notches in the screw. In addition, a substantial amount of composite material within the notches of the screw 112 can be fastened to the wall to help provide increased pullout resistance. Therefore, the wall of the orifice 116 is sufficiently compressive to require the assistance of a lever, screwdriver, or other extraction device to remove the nail or screw. Cementitious construction products can be used as a wood substitute for applications where multiple construction products are nailed, screwed, or bolted together. It is thought, without being attached to it, that the combination of a high weight percentage and / or fiber volume percentage, as described above, provides favorable interactions with the nails, screws, and / or bolts. This is because the high amount of fibers simulates the properties of wood. More particularly, each individual fiber can be deformed when it is first actuated by a nail or screw, and then compressed against the nail or screw to provide a clamping force thereto. This allows a nail or screw to be inserted into the cementitious construction product without causing chipping or substantial cracking. Additionally, the use of a high concentration of rheology modifier can also help to provide its functionality. For fibers, the rheology modifier provides a characteristic to the cementitious construction product that at least partially allows deformation without substantial chipping or cracking. In part, the rheology modifier can impart a plastic-like feature that holds the materials together around a site that is tightening, such as the point where a nail or screw is being inserted. As such, the nail or screw is capable of being inserted into the cementitious construction product, and the rheology modifier allows the required deformation without substantial chipping or cracking. For example, the high concentration of fibers, or other fillers can impart significant extraction resistance to the cementitious construction product. Extraction resistance for an IOd nail (for example, a nail characterized by a gauge 9 or 0.325 centimeters (0.128 inches) in diameter and 7.62 centimeters (3 inches) in length) embedded one inch in a cementitious compound may have a margin from about 5,253.80685 kg / s2 (30 lbf / in) to about 18,388.32398 kg / s2 (105 lbf / in), more preferably around 7,005.0758 kg / s2 (40 lbf / in) to about 16.637.05503 kg / s2 (95 lbf / pul), and more preferably about 8,756.34475 kg / s2 (50 lbf / pul) to about 14,885.78608 kg / s2 (85 lbf / in). Extraction resistance for a more porous cementitious compound can range from about 4378.172375 kg / s2 (25 lbf / in) to about 15,761.42055 kg / s2 (90 lbf / in), more preferably around 5,253.80685 kg / s2 (30 lbf / in) to about 12,258.88265 kg / s2 (70 lbf / in), and most preferably around 7,005.0758 kg / s2 (40 lbf / in) to about 10,507.6137 kg / s2 (60 lbf / in) . Extraction resistance for a harder cementitious composite can range from about 2,626.903425 kg / s2 (15 lbf / in) to about 10,507.6137 kg / s2 (60 lbf / in), most preferably from about 3,152,28411 kg / s2 (18 lbf / pul) to about 8,756.34475 kg / s2 (50 lbf / in), and most preferably around 3.502.5379 kg / s2 (20 lbf / in) to about 8,756.34475 kg / s2 (50 lbf / in) ).

However, it should be understood that the pull-out resistance for a product at a given density can change by altering the amount of fiber, porosity, filler, nail type, and the like. Similarly, the pull-out strength for a screw embedded an inch in a cementitious composite can range from about 35,025,379 kg / s2 (200 lbf / in) to about 175,126,895 kg / s2 (1,000 lbf / in), over preferably about 52,538.0685 kg / s2 (300 lbf / in) to about 166,370.5503 kg / s2 (950 lbf / in), and most preferably around 70.050.758 kg / s2 (400 lbf / in) to about 157,614,2055 kg / s2 (900 lbf / in). However, it should be understood that the pull-out resistance for a product at a given density can change by altering the amount of fiber, porosity, filler, nail type, and the like. Additionally, cementitious compounds primarily comprise inorganic materials that are less prone to rot when kept in a humid environment compared to wood. Although organic fibers may have a tendency to degrade under certain conditions, the generally high alkalinity of hydraulic cement will inhibit spoilage and deterioration in most circumstances.

EXAMPLES OF MODALITIES OF THE INVENTION Example 1 Several extrudable compositions having different concentrations of components are prepared according to the present invention. All mixtures are mixed according to the normal mixing procedures described above and in the references incorporated herein. Briefly, a fibrous fiber mixture, rheology modifying agent, and water are mixed for a mixing time of 1 hour before the additional components are added and mixed for an additional hour. The extrudable compositions are formulated as illustrated in Tables 1-6.

Table 1 SW = softwood and HW = hardwood Table 3 SW = softwood and HW = hardwood Table 4 SW = softwood v HW = hardwood Table 5 SW = softwood and HW = hardwood SW = softwood and HW = hardwood ? Following mixing, the compositions are extruded through a die holder having a rectangular opening of about 5.08 centimeters (2 inches) to about 10.16 centimeters (4 inches). A composite construction product is prepared in the form of a two by four. It is heated to a temperature of about 63 ° C (about 145 ° F) for about 2 days in order to controllably remove a portion of water while allowing or accelerating the hydration of Portland cement by water that is not remove. The construction product is characterized by being able to saw through a saw for ordinary wood and drilled using an auger to drill ordinary wood. The nails can be hammered and the screws can be screwed to the construction products using conventional tools used to work with wood products of similar dimension. Example 2 Various extrudable compositions having different concentrations of components are prepared according to Example 1. The extrudable compositions are formulated as illustrated in Tables 7-8. Table 7 Mixture # 1% Moisture Mixture # 2% Moisture Mixture # 3% Moisture Material KG Total KG Total KG Total Soft Wood Fiber 6.80 1 1% 6.8 10% 5 10% Hardwood Fiber - 0% 0 0% 0 0% Inorganic Microfiber - 0% 0 0% 0 0% Little Weight Filling - 0% 0 0% 0 0% Conventional filling 3.94 6% 3.94 6% 4 8% Rheology Modifying Agent 1.00 2% 0.6 1% 0.6 1% Cement 22.60 35% 22.6 34% 23 44% Water 30.00 47% 32 49% 20 38% Total 64.34 100% 65.94 100% 52.6 100% Table 8 Mixture # 4% Moisture Mixture # 5% Moisture Mixture # 6% Moisture Material KG Total KG Total KG Total Soft Wood Fiber 3.4 7% 4 8% 4 8% Hard Wood Fiber 0 0% 0 0% 1 2% Inorganic Microfibre 0 0% 3 6% 2.5 5% Low Weight Filling 0 0 % 1 2% 0 0% Conventional Filler 3.94 8% 0 0% 0 0% Rheology Modifying Agent 0.6 1% 0.6 1% 0.6 1% Cement 22.6 49% 23 45% 23 45% Water 16 34% 20 39% 20 39 % Total 46.54 100% 51.6 too% 51.1 100% The cementitious compositions that are exemplified by Mixtures 1-6 are extruded to a construction product and cured (eg, by the first heating). The amounts of each component are then calculated based on dry, and are given in Tables 9-10.

Table 9 Mixture # 1% Dry Mixture # 2% Dry Mixture # 3% Dry Material KG Total KG Total KG Total Soft Wood Fiber 6.80 20% 6.8 20% 5 15% Hardwood Fiber - 0% 0 0% 0 0% Inorganic Microfiber - 0% 0 0% 0 0% Little Weight Filling - 0% 0 0% 0 0% Conventional Landfill 3.94 1 1% 3.94 12% 4 12% Rheology Modifying Agent 1.00 3% 0.6 2% 0.6 2% Cement 22.60 66% 22.6 67% 23 71% Water - 0% 0 0% 0 0% Total 34.34 100% 33.94 100% 32.6 100% Table 10 Mix # 4% Dry Mix #S% Dry Mix # 6% Dry Material KG Total KG Total KG Total Soft Wood Fiber 3.4 11% 4 13% 4 13% Hardwood Fiber 0 0% 0 0% 1 3% Inorganic Microfibre 0 0% 3 9% 2.5 8% Little Weight Filling 0 0% 1 3% 0 0% Conventional Landfill 3.94 13% 0 0% 0 0% Rheology Modifying Agent 0.6 2% 0.6 2% 0.6 2% Cement 22.6 74% 23 73% 23 74% Water 0 0% 0 0% 0 0% Total 30.54 100% 31.6 100% 31.1 100% Example 3 The flexural strength of extruded cementitious building products was tested and compared with wood. More particularly, the flexural strength was tested as a function of displacement in centimeters (inches) in response to a force applied in kilograms (pounds). As such, the displacement of the wood (x) was compared with an unreinforced extruded compound (solid diamond -?), Extruded construction product reinforced with fiberglass reinforcing bar (solid square - |) and a construction product extruded reinforced with steel reinforcing bar (solid triangle - A), as described in Figure 8. As shown, the extruded cementitious construction products imitated the wood's displacement to about 124,738 Kg. of force (275 lbs of force). Additionally, extruded construction products reinforced with steel reinforcing bar and fiberglass reinforcing bar showed more displacement for the same strength compared to wood. Therefore, extruded cementitious building products can imitate wood at lower extreme forces, and cement-reinforced construction products reinforced with rebar can actually have greater displacement for a given strength compared to wood. Example 4 The tensile strength of an extruded cementitious product form was tested. As such, the elongation percentage of the extruded cementitious construction product was measured as a function of tensile strength in kilograms per square centimeter (pounds per square inch) (psi), which is described in Figure 9. The results of the study indicates that the extruded cementitious construction product is capable of elongating up to about 1.45% before producing tensile strength at about 35,153 kgf / cm2 (500 psi). Example 5 For comparative purposes, the displacement of wood in response to a compressive pressure was measured and compared with the displacement of one embodiment of the extruded cementitious construction product. Wood (solid diamond -?) And extruded cementitious construction product (solid square - |) were each tested in the form of an article of 2.54 cm x 7.62 cm (1"? 3") (1 inch by 3 inches) , with the force that was applied with the grain on the extreme surface of each beam. The results of the study are presented in Figure 10. Wood exhibited a gradual increase in displacement at the lower pressures, but then shifted from about 10% displacement to about 50% displacement at about 309,351 kgf / cm2 (4,400 psi), which is shown by the almost horizontal line. The extruded cementitious construction product exhibited a similar displacement tendency at a lower compressive load of about 105.46 kgf / cm2 (1, 500 psi) to around 140,614 kgf / cm2 (2,000 psi), but began to resist displacement only after moving around 30%. Therefore, when a force is applied to the wood or cementitious construction product extruded at the end surface, a large displacement in a critical force can occur before again resisting the compressive force. Example 6 A cementitious composition (6-7-06-1) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 11A. The extrudate was covered with plastic and stored at room temperature until it set. The set extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C in order to controllably remove a portion of the water while accelerating the hydration of the cement binder. The cured extrudate thereafter was completely and substantially dehydrated in a drying oven, and the construction product was tested dry. The construction product had the following dimensions: length of 12.91 cm; 8.64 cm width; height of 1.92 cm; and weight of 232.45 g. The construction product exhibited the properties described in Table 11B.

Table 11 A Input Percentage of Volume Mass Composition Volume (Kq.¾ Composition Total Composition Total Water 18,000 36.6 59.0 Cement - White 23,000 46.7 23.9 Newspaper 4,000 8.1 10.9 Limestone 3,500 7.1 4.2 Cellulosic Ether 0.600 1.2 1.6 Delvo 0.100 0.2 0.3 Total Weight (Kg.) 49.200 100.0% 100.0% Delvo: concrete stabilizer sold by BASF Table 11B Example 7 A cementitious composition (6-8-06-1) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 12. The extrudate was covered with plastic and stored at room temperature until it set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was completely and substantially dehydrated in a drying oven, and the construction product was tested dry.

The construction product had the following dimensions: length of 12.4 cm; width of 8.8 cm; height of 1.96 cm; and weight of 256.49 g. The construction product exhibited the properties described in Table 12B. Table 12A Table 12B Example 8 A cementitious composition (6-14-06-1) was prepared and processed in a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 13 A. The extrudate was covered with plastic and stored at room temperature until it set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was completely and substantially dehydrated in a drying oven, and the construction product was tested dry. The construction product had the following dimensions: length of 12.53 cm; width of 8.77 cm; height of 1.96 cm; and weight of 228.08 g. The construction product exhibited the properties described in Table 13B. Table 13A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass (Kq.) Composition Total Composition Total Table 13B Example 9 A cementitious composition (6-14-06-2) was prepared and processed in a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 14. The extrudate was covered with plastic and stored at room temperature until it set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was completely and substantially dehydrated in a drying oven, and the construction product was tested dry. The construction product had the following dimensions: length of 12.57 cm; width of 8.96 cm; height of 2.06 cm; and weight of 242.88 g. The construction product exhibited the properties described in Table 14B. Table 14A Percentage of Mass Percentage of Humid Entry of the Wet Volume of Composites Mass (Kq.) Composition Total Composition Total Table 14B Example 10 A cementitious composition (6-21-06-1) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 15 A. The extrudate was covered with plastic and stored at room temperature until it set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was completely and substantially dehydrated in a drying oven, and the construction product was tested dry. The construction product exhibited the properties described in Table 15B. Table 15A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (k) (%) vol (% ( Table 15B Example 11 A cementitious composition (6-27-06-1) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 16 A. The extrudate was covered with plastic and stored at room temperature until it set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was completely and substantially dehydrated in a drying oven, and the construction product was tested dry. The construction product had the following dimensions: length of 12.93 cm; width of 8.86 cm; height of 4.33 cm; and weight of 550.03 g. The construction product exhibited the properties described in Table 16B.

Table 16A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 16B Example 12 A cementitious composition (6-29-06-1) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 17 A. The extrudate was covered with plastic and stored at room temperature until it set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was completely and substantially dehydrated in a drying oven, and the construction product was tested dry. The construction product had the following dimensions: length of 12.64 was; width of 8.87 cm; 2.03 cm height; and weight of 200.67 g. The construction product exhibited the properties described in Table 17B. Table 17A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 17B Example 13 A cementitious composition (7-3-06-1) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 18 A. The extrudate was covered with plastic and stored at room temperature until it set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was completely and substantially dehydrated in a drying oven, and the construction product was tested dry. The construction product had the following dimensions: length of 12.4 cm; width of 8.4 cm; height of 1.86 cm; and weight of 197,580 g. The construction product exhibited the properties described in Table 18B. Table 18A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 18B Example 14 A cementitious composition (7-5-06-1) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 19 A. The extrudate was covered with plastic and stored at room temperature until it set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was completely and substantially dehydrated in a drying oven, and the construction product was tested dry. The construction product had the following dimensions: length of 12.62 cm; width of 8.8 was; height of 1.92 cm; and weight of 313.34 g. The construction product exhibited the properties described in Table 19B. Table 19A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 19B Example 15 A cementitious composition (7-7-06-1) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 20. The extrudate was covered with plastic and stored at room temperature until it set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was completely and substantially dehydrated in a drying oven, and the construction product was tested dry. The construction product had the following dimensions: length of 35.3 cm; width of 8.8 cm; height of 1.8 was; and weight of 852.12 g. The construction product exhibited the properties described in Table 20B. Table 20A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 20B Example 16 A cementitious composition (7-13-06-1) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 21 A. The extrudate was covered with plastic and stored at room temperature until it set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was completely and substantially dehydrated in a drying oven, and the construction product was tested dry. The construction product exhibited the properties described in Table 21B. Table 21 A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 21 B Example 17 A cementitious composition (7-13-06-2) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 22 A. The extrudate was covered with plastic and stored at room temperature until it set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was completely and substantially dehydrated in a drying oven, and the construction product was tested dry. The construction product exhibited the properties described in Table 22B. Table 22A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 22B Example 18 A cementitious composition (7-14-06-1) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 23 A. The extrudate was covered with plastic and stored at room temperature until it set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was completely and substantially dehydrated in a drying oven, and the construction product was tested dry. The construction product exhibited the properties described in Table 23B. Table 23A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 23B Example 19 A cementitious composition (7-14-06-2) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 24 A. The extrudate was covered with plastic and stored at room temperature until it was set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was completely and substantially dehydrated in a drying oven, and the construction product was tested dry. The construction product had the following dimensions: length of 15.2 cm; width of 8.5 cm; height of 1.8 cm; and weight of 211.82 g. The construction product exhibited the properties described in Table 24B.

Table 24A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 24B Example 20 A cementitious composition (7-14-06-3) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 25 A. The extrudate was covered with plastic and stored at room temperature until it set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was completely and substantially dehydrated in a drying oven, and the construction product was tested dry.

The construction product had the following dimensions: length of 15.4 was; width of 8.4 cm; height of 1.8 cm; and weight of 212.15 g. The construction product exhibited the properties described in Table 25B. Table 25A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 25B Example 21 A cementitious composition (7-17-06-1-0) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 26 A. The extrudate was immediately placed in a desiccation oven after extrusion. After complete dehydration, the extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 16.6 cm; width of 8.8 cm; height of 1.95 cm; and weight of 261.57 g. The construction product exhibited the properties described in Table 26B. Table 26A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 26B Example 22 A cementitious composition (7-17-06-1-1) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 27 A. The extrudate was placed in a drying oven 1 hour after extrusion. After complete dehydration, the extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 16.6 cm; width of 8.8 cm; height of 1.95 cm; and weight of 261.57 g. The construction product exhibited the properties described in Table 27B. Table 27A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 27B Example 23 A cementitious composition (7-17-06-1-2) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 28? The extrudate was placed in a drying oven 2 hours after extrusion. After complete dehydration, the extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 16.9 cm; width of 8.7 cm; height of 1.94 cm; and weight of 272.91 g. The construction product exhibited the properties described in Table 28B.

Table 28A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 28B Example 24 A cementitious composition (7-17-06-1-3) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 29? The extrudate was placed in a drying oven 3 hours after extrusion. After complete dehydration, the extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 14.3 cm; width of 8.7 cm; height of 1.94 cm; and weight of 238.98 g. The construction product exhibited the properties described in Table 29B. Table 29A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total Table 29B Example 25 A cementitious composition (7-17-06-1-4) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 30 A. The extrudate was placed in a drying oven 4 hours after extrusion. After complete dehydration, the extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 15.2 cm; width of 8.7 cm; height of 1.96 cm; and weight of 245.57 g. The construction product exhibited the properties described in Table 30B. Table 30A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 30B Example 26 A cementitious composition (7-17-06-1-5) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 31 A. The extrudate was placed in a desiccation oven 5 hours after extrusion. After complete dehydration, the extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 15.2 cm; width of 8.7 cm; 1.93 cm height; and weight of 250.77 g. The construction product exhibited the properties described in Table 31B. Table 31A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 31B Example 27 A cementitious composition (7-17-06-1-6) was prepared and processed in a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 32. The extrudate was placed in a drying oven 6 hours after extrusion. After complete dehydration, the extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 15.8 cm; width of 8.7 cm; height of 1.96 cm; and weight of 250.77 g. The construction product exhibited the properties described in Table 32B.

Table 32A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 32B Example 28 A cementitious composition (7-17-06-1-28) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 33 A. The extrudate was covered with plastic and maintained at room temperature. The extrudate was then placed in a drying oven 28 days after extrusion. After complete dehydration, the extrudate was covered with plastic and maintained at room temperature. The cured extrudate was again dehydrated completely and substantially in a drying oven until completely dehydrated the day before the test, and the construction product was tested dry. The construction product exhibited the properties described in Table 33B. Table 33A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Example 29 A cementitious composition (7-17-06-2) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 34 A. The extrudate was covered with plastic at room temperature until it was set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 35.7 cm; width of 8.9 cm; height of 1.9 cm; and weight of 547.09 g. The construction product exhibited the properties described in Table 34B. Table 34A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol () Table 34B Example 30 A cementitious composition (7-18-06-1) was prepared and processed into a cementitious construction product, and the construction product was tested for physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 35 A. The extrudate was covered with plastic at room temperature until it was set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 35.72 cm; width of 8.7 cm; height of 2 cm; and weight of 580.88 g. The construction product exhibited the properties described in Table 35B. Table 35A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 35B Example 31 A cementitious composition (7-20-06-1) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 36 A. The extrudate was covered with plastic at room temperature until it was set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 35.4 cm; width of 8.9 cm; height of 1.9 cm; and weight of 560.28 g. The construction product exhibited the properties described in Table 36B.

Table 36A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 36B Example 32 A cementitious composition (7-21-06-1) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 37 A. The extrudate was covered with plastic at room temperature until it was set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 35.1 cm width of 8.9 cm; height of 2.0 cm; and weight of 817.17 g. The construction product exhibited the properties described in Table 37B.

Table 37A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 37B Example 33 A cementitious composition (7-21-06-2) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 38 A. The extrudate was covered with plastic at room temperature until it was set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length 29 cm; width of 8.8 cm; height of 2.0 cm; and weight of 451.38 g. The construction product exhibited the properties described in Table 38B. Table 38A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Example 34 A cementitious composition (7-24-06-1) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 39 A. The extrudate was covered with plastic at room temperature until it set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 19 cm; 8.3 cm wide; height of 1.9 cm; and weight of 264.14 g. The construction product exhibited the properties described in Table 39B. Table 39A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 39B Example 35 A cementitious composition (7-24-06-1-0) was prepared and processed into a cementitious construction product, and the construction product was tested for physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 40 A. The extrudate was covered with plastic at room temperature, and then placed in a drying oven on the same day of extrusion. The dried extrudate was then placed in plastic and stored at room temperature. The extrudate was dehydrated again completely and substantially in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 19.5 cm; width of 9 cm; and height of 2 cm. The construction product exhibited the properties described in Table 40B. Table 40A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Example 36 A cementitious composition (7-24-06-1-1) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 41? . The extrudate was covered with plastic at room temperature, and then placed in a drying oven one day after extrusion. The dried extrudate was then placed in plastic and stored at room temperature. The extrudate was dehydrated again completely and substantially in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 19.5 cm; width of 9 cm; and height of 2 cm. The construction product exhibited the properties described in Table 41B.

Table 41 A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 41 B Example 37 A cementitious composition (7-24-06-1-2) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 42? The extrudate was covered with plastic at room temperature, and then placed in a drying oven two days after extrusion. The dried extrudate was then placed in plastic and stored at room temperature. The extrudate was dehydrated again completely and substantially in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 19.5 cm; width of 9 cm; and height of 2 cm. The construction product exhibited the properties described in Table 42B.

Table 42A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total Table 42B Example 38 A cementitious composition (7-24-06-1-4) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 43? The extrudate was covered with plastic at room temperature, and then placed in a drying oven four days after extrusion. The dried extrudate was then placed in plastic and stored at room temperature. The extrudate was dehydrated again completely and substantially in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 19.5 cm; width of 9 cm; and height of 2 cm. The construction product exhibited the properties described in Table 43B. Table 43A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total Table 43B Example 39 A cementitious composition (7-24-06-1-8) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 44 A. The extrudate was covered with plastic at room temperature, and then placed in a drying oven eight days after extrusion. The dried extrudate was then placed in plastic and stored at room temperature. The extrudate was dehydrated again completely and substantially in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 19.5 cm; width of 9 cm; and height of 2 cm. The construction product exhibited the properties described in Table 44B. Table 44A Percentage of Mass Percentage of Humid of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Example 40 A cementitious composition (7-24-06-1-22) was prepared and processed into a cementitious construction product, and the construction product was tested for physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 45 A. The extrudate was covered with plastic at room temperature, and then placed in a drying oven twenty-two days after extrusion. The dried extrudate was then placed in plastic and stored at room temperature. The extrudate was dehydrated again completely and substantially in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 19.5 cm; width of 9 cm; and height of 2 cm. The construction product exhibited the properties described in Table 45B. Table 45A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 45B Example 41 A cementitious composition (7-24-06-1-32) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 46 A. The extrudate was covered with plastic at room temperature, and then placed in a drying oven thirty-two days after extrusion. The dried extrudate was then placed in plastic and stored at room temperature. The extrudate was dehydrated again completely and substantially in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 19.5 cm; width of 9 cm; and height of 2 cm. The construction product exhibited the properties described in Table 46B. Table 46A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 46B Example 42 A cementitious composition (7-24-06-2) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 47 A. The extrudate was covered with plastic at room temperature until it was set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 17.4 cm; width of 8.5 cm; and height of 1.9 cm. The construction product exhibited the properties described in Table 47B.

Table 47A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 47B Example 43 A cementitious composition (7-24-06-3) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 48 A. The extrudate was covered with plastic at room temperature until it set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 17.9 cm width of 8. 4 was; height of 1.9 cm; and a weight of 232.8 g. The construction product exhibited the properties described in Table 48B.

Table 48A Percentage of Mass Percentage of Humid of the Humid Volume of Composition Composition Total Composition Total (component) (%) vol (%) Table 48B Example 44 A cementitious composition (7-31-06-7) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 49 A. The extrudate was covered with plastic at room temperature until it was set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 16.6 cm; width of 8.4 cm; height of 1.95 cm; and a weight of 199.64 g. The construction product exhibited the properties described in Table 49B. Table 49A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 49B Example 45 A cementitious composition (7-31-06-8) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 50 A. The extrudate was covered with plastic at room temperature until it was set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 16.6 cm; width of 8.4 cm; height of 1.95 cm; and a weight of 199.64 g. The construction product exhibited the properties described in Table 50B.

Table 50A Percentage of Mass Percent of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (% | Table 50B Example 46 A cementitious composition (8-1-06-4) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 51 A. The extrudate was covered with plastic at room temperature until it was set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 16.13 cm; width of 8.4 cm; height of 1.96 was; and a weight of 204.17 g. The construction product exhibited the properties described in Table 51B.

Table 51 A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 51 B Example 47 A cementitious composition (8-1-06-9) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 52 A. The extrudate was covered with plastic at room temperature until it was set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 17.04 cm; 8.58 cm width; height of 1.99 cm; and a weight of 255.36 g. The construction product exhibited the properties described in Table 52B. Table 52A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total Table 52B Example 48 A cementitious composition (8-2-06-1) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 53 A. The extrudate was covered with plastic at room temperature until it was set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 16.34 cm; width of 7.66 cm; height of 1.86 cm; and a weight of 215.51 g. The construction product exhibited the properties described in Table 53B.

Table 53A Percentage of Mass Percent of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 53B Example 49 A cementitious composition (8-2-06-2) was prepared and processed in a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 54 A. The extrudate was covered with plastic at room temperature until it was set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 16.1 cm; 7.87 cm wide; height of 1.87 cm; and a weight of 226.8 g. The construction product exhibited the properties described in Table 54B.

Table 54A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 54B Example 50 A cementitious composition (8-2-06-3) was prepared and processed into a cementitious construction product, and the construction product was tested for physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 55 A. The extrudate was covered with plastic at room temperature until it was set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 35 cm; width of 8.81 cm; 1.98 cm height; and a weight of 660.44 g. The construction product exhibited the properties described in Table 55B. Table 55A Percentage of Mass Percent of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 55B Example 51 A cementitious composition (8-2-06-5) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 56? The extrudate was covered with plastic at room temperature until it was set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 15.4 cm; 8.35 cm width; 2.04 cm height; and a weight of 197.18 g. The construction product exhibited the properties described in Table 56B.

Table 56A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 56B Example 52 A cementitious composition (8-2-06-6) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 57 A. The extrudate was covered with plastic at room temperature until it set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 17.1 cm; 8.62 cm width; 2.03 cm height; and a weight of 248.32 g. The construction product exhibited the properties described in Table 57B.

Table 57A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 57B Example 53 A cementitious composition (8-16-06-1) was prepared and processed in a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 58 A. The extrudate was covered with plastic at room temperature until it was set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 15.83 cm; width of 6.9 cm; height of 0.99 cm; and a weight of 128.6 g. The construction product exhibited the properties described in Table 58B.

Table 58A Percentage of Mass Percentage of Humid Entry of the Wet Volume of Composites Mass Composition Total Composition Total Table 58B Example 54 A cementitious composition (9-6-06-1-5) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 59 A. The extrudate was covered with plastic at room temperature until it was set. The set extrudate was then placed in a curing tank for 5 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 16.7 cm; width of 8.97 cm; 2.03 cm height; and a weight of 312.42 g. The construction product exhibited the properties described in Table 59B.

Table 59A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (> vol (%) Table 59B Example 55 A cementitious composition (9-6-06-1-6) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 60 A. The extrudate was covered with plastic at room temperature until it set. The hardened extrudate was then placed in a curing tank for 6 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 15.9 cm; width of 8.91 cm; 2.03 cm height; and a weight of 296.28 g. The construction product exhibited the properties described in Table 60B.

Table 60A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 60B Example 56 A cementitious composition (9-6-06-1-7) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 61? The extrudate was covered with plastic at room temperature until it was set. The set extrudate was then placed in a curing tank for 7 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 11.1 was; width of 8.91 cm; height of 2.05 cm; and a weight of 211.26 g. The construction product exhibited the properties described in Table 61B. Table 61 A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 61 B Example 57 A cementitious composition (9-6-06-1-8) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 62 A. The extrudate was covered with plastic at room temperature until it was set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 16.6 cm; 8.63 cm width; height of 1.95 cm; and a weight of 199.64 g. The construction product exhibited the properties described in Table 62B.

Table 62A Percentage of Mass Percent of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 62B Example 58 A cementitious composition (9-8-06-1) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 63 A. The extrudate was covered with plastic at room temperature until it set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 10.95 cm; 8.65 cm width; height of 1.87 cm; and a weight of 189.67 g. The construction product exhibited the properties described in Table 63B. Table 63A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 63B Example 59 A cementitious composition (9-8-06-2) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 64 A. The extrudate was covered with plastic at room temperature until it set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product had the following dimensions: length of 11.7 cm; width of 8.6 cm; height of 1.9 cm; and a weight of 202.8 g. The construction product exhibited the properties described in Table 64B.

Table 64A Percentage of Mass Percent of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 64B Example 60 A cementitious composition (9-18-06-1-1) was prepared and processed in a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 65? The extrudate was covered with plastic at room temperature until it was set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was removed from the curing tank and tested wet. The wet construction product had the following dimensions: length of 12 cm; width of 9 cm; height of 2 cm; and a weight of 308.57 g. Additionally, the construction product was dried to have the following drying properties: length of 10.63 cm; 8.54 cm width; height of 1.8 cm; and weight of 179.3 g. The construction product exhibited the properties described in Table 65B.

Table 65A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 65B Example 61 A cementitious composition (9-18-06-1-2) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 66 A. The extrudate was covered with plastic at room temperature until it set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product exhibited the properties described in Table 66B. Table 66A Percentage of Mass Percent of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Example 62 A cementitious composition (9-18-06-1-3) was prepared and processed into a cementitious construction product, and the construction product was tested to determine the physical properties. Briefly, the cementitious construction product was prepared by mixing and extruding the composition described in Table 67? . The extrudate was covered with plastic at room temperature until it was set. The hardened extrudate was then placed in a curing tank for 8 days and maintained at 55 ° C. The cured extrudate was again fully and substantially dehydrated in a drying oven until completely dehydrated, and the construction product was tested dry. The construction product exhibited the properties described in Table 67B. Table 67A Percentage of Mass Percentage of Humid Entry of the Humid Volume of Composition Mass Composition Total Composition Total (component) (kg) (%) vol (%) Table 67B Example 63 The cementitious construction product of Example 6 was tested to determine the gripping force of the nail in accordance with the standard ASTM methods described in Designation: D 1761-88 (Approved again in 2000), published by ASTM. The cementitious construction product was determined to have a nail gripping force of 12,651.16689 kg / s2 (72.24 lbf / in). Example 64 The cementitious construction product of Example 9 was tested to determine the nail gripping force and the gripping force of the screw according to the standard ASTM methods described in the Designation: D 1761-88 (Approved again in 2000) , published by ASTM. The cementitious construction product was determined to have a nail gripping force of 15,218.52718 kg / s2 (86.9 lbf / in), and a screw grip force of 150,987.4038 kg / s2 (862.16 lbf / in). Example 65 The cementitious construction product of Example was tested to determine the clamping force of the nail and the gripping force of the screw according to standard ASTM methods. The cementitious construction product was determined to have a nail gripping force of 6.280.050455 kg / s2 (35.86 lbf / in), and a screw grip force of 69.943.93059 kg / s2 (399.39 lbf / in). The present invention can be represented in other specific forms without deviating from its spirit or essential characteristics. The described modalities are to be considered in every sense only in an illustrative and not restrictive way. Therefore, the scope of the invention is indicated by the. appended claims instead of the above description All changes that arise within the meaning and scope of equivalency of the claims will be adopted within its scope.

Claims

CLAIMS 1. A cementitious product for use as a wood substitute, the product comprises: a cured cementitious compound comprising a hydraulic cement, a rheology modifying agent, and fibers substantially homogeneously distributed through the cured cementitious composition and included in an amount greater than about 10% by weight of the cured cementitious compound, such cured cementitious compound characterized by: a cross-sectional thickness of at least 2 mm; a flexural firmness in a range of about 14,061,397 kgf / cm2 (200,000 psi) to about 351,534.93 kgf / cm2 (5,000,000 psi); accept the standard wood nails using a hammer or nail gun and standard wood screws using a screwdriver; a resistance to nail extraction of at least about 4,378.172375 kg / s2 (25 lbf / in) using the standard AST method; and a screw withdrawal force of at least about 52,538.0685 kg / s2 (300 lbf / in) using a standard ASTM method; such a cured cementitious composition which is prepared by a process comprising: mixing together the water, hydraulic cement, fibers and a rheology modifying agent to form an extrudable cementitious composition in which the fibers are substantially homogeneously dispersed, the extrudable cementitious composition has a plastic consistency and which includes water in a concentration from about 25% to about 75% wet weight, hydraulic cement in a concentration from about 25% to about 75% wet weight, rheology modifying agent in a concentration from about 0.1% to about 10% by wet weight, and fibers in a concentration greater than about 5% by wet weight; extruding the extrudable cementitious composition into an unprocessed intermediate extrudate having a predefined cross-sectional area, the unprocessed extrudate having a stable extrusion shape and being capable of substantially retaining the cross-sectional area to allow handling without breaking; causing or allowing the hydraulic cement to cure to form the cementitious compound in a manner so that the hydraulic cement contributes to an adherent force that is at least about 50% of the overall adhesive strength of the cementitious compound.
2. The cementitious product according to claim 1, characterized in that the hydraulic cement is cured by heating the intermediate extrudate to remove a portion of the water by evaporation and reduce the density of the extrudate.
3. The cementitious product according to claim 1, characterized in that the extrudable composition has a nominal water / cement ratio greater than about 0.75 before heating and an actual water / cement ratio of less than about 0.5 after the evaporation of the water portion.
4. The cementitious composite product according to claim 1, further characterized in that it comprises at least one reinforcing member selected from the group consisting of the reinforcing bar, cable, mesh and fabric at least partially encapsulated by the cementitious compound. .
5. The cementitious product according to claim 4, characterized in that at least one reinforcing member is adhered to the cementitious compound by an adherent agent.
6. The cementitious product according to claim 1, characterized in that the fibers are included in an amount greater than about 15% by dry weight of the cementitious compound.
The cementitious product according to claim 1, characterized in that the fibers are included in an amount greater than about 20% by dry weight of the cementitious compound.
8. The cementitious composite product according to claim 1, the cementitious compound is characterized by being configured in a cut cap.
9. The cementitious product according to claim 1, the cementitious compound characterized in that it comprises a construction product that is a substitute for a timber construction product.
10. The cementitious product according to claim 1, characterized in that the cementitious compound has a density of less than about 1.2 g / cm3.
11. The cementitious composite product according to claim 1, characterized in that the cementitious compound can be sawed using a standard wood saw.
12. The cementitious product according to claim 9, characterized in that the construction product has a shape selected from the group consisting of a rod, bar, tube, cylinder, board, beams I, public service wooden post, lid cut, two by four, structural board, one by eight, board, straightened sheet, roof tile, and a table that has a hollow interior.
13. The cementitious composite product according to claim 9, characterized in that the construction product is capable of receiving an IOd nail when hammering thereon with a hand hammer without significantly bending.
14. The cementitious product according to claim 9, characterized in that the construction product has a resistance to nail extraction of at least about 8,756.34475 kg / s2 (50 lbf / in) for a lOd nail.
15. The cementitious product according to claim 9, characterized in that the construction product has a screw removal strength of at least about 87,563.4475 kg / s2 (500 lbf / in).
16. The cementitious product according to claim 1, characterized in that at least one of the following: the fibers that are selected from a group consisting of hemp fibers, cotton fibers, trunk fibers or plant sheet , hardwood fibers, softwood fibers, glass fibers, graphite fibers, silica fibers, ceramic fibers, metal fibers, polymer fibers, polypropylene fibers, carbon fibers, and combinations thereof; Hydraulic cement selected from the group consisting of Portland cements, MDF cements, DSP cements, Densit type cements, Pyrament type cements, calcium aluminate cements, gypsum, silicate cements, gypsum cements, phosphate cements, high alumina cements, micro fine cements, slag cements, magnesium oxychloride cements, and combinations thereof; the rheology modifying agent selected from the group consisting of polysaccharides, proteins, celluloses, starches, methylhydroxyethylcellulose, hydroxymethylethylcellulose, carboxymethylcellulose, methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, amylopectin, amulose, SEAgel, starch acetates, starch hydroxyethers, starches ionics, long chain alkyl starches, dextrins, amine starches, phosphate starches, dialdehyde starches, clay and combinations thereof; which includes a setting accelerator from the group consisting of Na2OH, KC03, KOH, NaOH, CaCl2, C02, magnesium chloride, triethanolamine, aluminates, inorganic salts of HC1, inorganic salts of HN03, inorganic salts of H2SO4, hydrates of calcium silicate (CSH), and combinations thereof; or that includes a filling material chosen from the group consisting of sand, dolomite, gravel, rock, basalt, granite, limestone, sandstone, glass beads, aerogels, xerogels, seagel, mica, clay, synthetic clay, alumina, silica, loose ash, silica fume, tabular alumina, kaolin, glass microspheres, ceramic spheres, gypsum dihydrate, calcium carbonate, calcium aluminate, and combinations thereof.
17. A method for manufacturing a cementitious compound having suitable properties for use as a substitute for wood timber, comprises: mixing together water, hydraulic cement, fibers and a rheology modifying agent to form an extrudable cementitious compound in which the fibers are substantially homogeneously dispersed, the extrudable cementitious composition has a plastic consistency and which includes water in a concentration from about 25% to about 75% by wet weight, hydraulic cement in a concentration from about 25% to about 75 % by wet weight, rheology modifying agent in a concentration from about 0.1% to about 10% by wet weight, and fibers in a concentration greater than about 5% by wet weight; extruding the extrudable cementitious composition into an unprocessed intermediate extrudate having a predefined cross-sectional area, the unprocessed extrudate having a stable extrusion shape and being capable of substantially retaining the cross-sectional area to allow handling without breaking; cause or allow the hydraulic cement to cure to form the cementitious compound in a manner so that the hydraulic cement contributes to an adherent strength that is at least about 50% of the overall adhesive strength of the cementitious compound, which is characterized by one or more of the following: a thickness in cross section of at least 2 mm; a density of less than about 1.2 g / cm3; a flexural modulus in a range of about 14,061,397 kgf / cm2 (200,000 psi) to about 351,534.93 kgf / cm2 (5,000,000 psi); accept the standard wood nails using a hammer or nail gun and standard wood screws using a screwdriver; a resistance to nail extraction of at least about 4378.172375 kg / s2 (25 lbf / in) using the standard ASTM method; and a screw withdrawal force of at least about 52,538.0685 kg / s2 (300 lbf / in) using a standard ASTM method; or can be sawed using a standard wood saw.
18. The method according to claim 17, characterized in that the fibers are included in an amount greater than about 10% by wet weight of the extrudable cementitious composition.
19. The method according to the claim 17, characterized in that the fibers are included in an amount greater than about 15% by wet weight of the extrudable cementitious composition.
The method according to claim 17, characterized in that the hydraulic cement is cured by heating the intermediate extrudate to remove a portion of the water by evaporation and reduce the density of the extrudate.
The method according to claim 20, characterized in that the extrudable composition has a nominal water / cement ratio greater than about 0.75 before heating and an actual water / cement ratio of less than about 0.5 after evaporation of the portion of water.
22. The method of compliance with the claim 17, characterized in that it extrudes the extrudable cementitious composition around at least one reinforcing member selected from the group consisting of the reinforcing bar, cable, mesh and fabric to at least partially encapsulate the reinforcing member within the unprocessed extrudate.
23. The method according to claim 22, further characterized in that it comprises: extruding an unprocessed extrudate having at least one continuous orifice having a stable shape; inserting a reinforcing bar and an adherent agent into the continuous orifice while the cementitious compound is in a stable unprocessed state or is at least partially cured; and adhering the reinforcing bar to a surface of the continuous bore with the bonding agent, optionally by applying the bonding agent to the rebar before inserting the rebar.
24. The method according to claim 17, further characterized in that it comprises configuring the cementitious compound in a cut cap.
25. The method according to claim 17, further characterized in that it comprises processing the cementitious compound in a construction product to be a substitute for a timber construction product having a shape selected from the group consisting of a rod, bar, pipe, cylinder, board, beams I, utility pole, cover cut, two by four, structural plank, one by eight, board, straightened sheet, roof tile, and a table that has a hollow interior.
26. The method according to claim 17, further characterized in that it comprises processing the extruded unprocessed stably and / or cured cementitious compound by at least one process selected from the group consisting of bending, cutting, sawing, sanding, grinding, texturize, flatten, polish, polish, pre-drill holes, paint and dye.
27. The method according to claim 17, further characterized in that it comprises recycling a portion of the unprocessed extrudate of waste obtained from processing the unprocessed extrudate, wherein recycling includes combining the unprocessed extrudate of waste with the extrudable cementitious composition.
28. The method according to claim 17, characterized in that the cementitious composition is extruded through a die opening and / or by roll extrusion.
29. The method according to claim 17, further characterized in that it comprises die-cutting or impact molding the unprocessed intermediate extrudate.