Classifications

• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
  • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
  • C04B28/10—Lime cements or magnesium oxide cements
  • C04B28/12—Hydraulic lime
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
  • C04B20/10—Coating or impregnating
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
  • C04B20/10—Coating or impregnating
  • C04B20/1018—Coating or impregnating with organic materials
  • C04B20/1029—Macromolecular compounds
  • C04B20/1033—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
  • C04B24/02—Alcohols; Phenols; Ethers
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
  • C04B26/02—Macromolecular compounds
  • C04B26/04—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
  • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
  • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
  • C04B28/04—Portland cements
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
  • C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
  • C04B28/16—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing anhydrite, e.g. Keene's cement
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
  • C04B2103/48—Foam stabilisers
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
  • C04B2111/00034—Physico-chemical characteristics of the mixtures
  • C04B2111/00146—Sprayable or pumpable mixtures
  • C04B2111/00155—Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
  • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
  • C04B2111/00482—Coating or impregnation materials
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
  • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
  • C04B2111/00637—Uses not provided for elsewhere in C04B2111/00 as glue or binder for uniting building or structural materials
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
  • C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
  • C04B2111/72—Repairing or restoring existing buildings or building materials
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W30/00—Technologies for solid waste management
  • Y02W30/50—Reuse, recycling or recovery technologies
  • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

• the present invention relates to a method for the preparation of a lightweight concrete or mortar having a density in the cured state of less than 1800 kg / m 3 , from a dry or paste composition, the mortar composition or concrete thus obtained and its use in the manufacture of construction products such as wall coatings, facade coatings, technical mortars, floor renders or lightweight screeds.
• Concretes or mortars are composed of aggregates and / or sands agglomerated by a lant.
• aggregates are aggregates of stone, gravel or sand.
• Mortar is distinguished from concrete by the size of aggregates present in its composition. 3 the aggregates have a mean diameter greater than 8 mm, we speak of concrete. 3 their diameter is less than 8 mm, it will be called mortar.
• a mortar is composed of fine sands or aggregates and f ilers which are finely ground inorganic materials, all of which constituents are agglomerated by a lant.
• Lightweight concrete is characterized by a lower volumetric mass than a common concrete. While a common concrete or mortar has a density in the cured state of about 2300 kg / m 3 , a concrete or light mortar is conventionally characterized by a density in the cured state of less than 1800 kg / m 3 .
• the lightening of mortars or concretes is carried out either by the introduction of lightening loads, such as expanded clays, expanded schists, pumice stones, expanded polystyrene (or EPS, cork, cenospheres). in particular fly ash, expanded glass, vermiculite or perlite, or by the introduction into the composition of surfactants which generate air bubbles during mixing or by chemical reaction, for example in the presence of powdered dusts.
• lightening loads such as expanded clays, expanded schists, pumice stones, expanded polystyrene (or EPS, cork, cenospheres).
• fly ash expanded glass, vermiculite or perlite
• surfactants which generate air bubbles during mixing or by chemical reaction, for example in the presence of powdered dusts.
• the solution adopted today for the lightening of wall coatings (monolayers for example) or screeds is obtained by the addition of light mineral fillers such as perlite, vermiculite, expanded clay (Leca®), EPS or glass expanded (Poraver®).
• light mineral fillers such as perlite, vermiculite, expanded clay (Leca®), EPS or glass expanded (Poraver®).
• the inventors have surprisingly discovered that it is possible to obtain a mortar or concrete composition having the same lightening properties as a composition based on lightening fillers, even if it is free of such fillers, but which remains stable. in the pasty state before curing and which has the properties of workability and strength sought for the desired applications.
• Lightening is achieved by essentially using the entrained air during mixing of the mortar or concrete composition during its preparation process.
• the process developed in the present invention advantageously makes it possible to reduce the consumption of granules lightened compared with to the solutions currently used: for the same surface to be coated and the same thickness of product, while maintaining the desired mechanical properties, it is possible to use a smaller amount of powdered mortar composition or paste.
• the proposed solution is more sustainable in terms of the environment than the solutions currently used: it makes it possible in particular to limit the consumption of raw materials which are wasteful riches, by using a readily available by-product of the biodiesel industry.
• Formulations that use lighter fillers as the sole means of lightening are highly energy-intensive since these fillers must be extracted or prepared and then shaped to meet the lightening criterion and again be transported to the processing site. , then on the site of use.
• the present invention relates to a process for the preparation of a lightened concrete or concrete having a density in the cured state of less than 1800 kg / m 3 from a dry composition or from a mortar or concrete paste comprising at least one inorganic or organic binder, aggregates and fillers, and at least one air-entraining agent, in which the various constituents are mixed in the presence of a quantity of glycerine of between 0.01 and 4% by weight relative to the weight total of the dry or paste composition.
• the process according to the present invention makes it possible to prepare a lightened concrete or concrete composition without requiring the prior formation of an intermediate foam which would then be mixed with the rest of the constituents, in particular with the binder.
• the lightened composition is prepared directly in a single step and is stable in the pasty state.
• the mortar composition may be in pulverulent form and is then referred to as a dry composition. Such a composition is said to be “ready to mix” in the sense that only an addition of water is necessary to obtain the composition of mortar or wet concrete which will then harden.
• the mortar composition may also be in the form of a paste and is referred to as a paste mortar composition. Such a composition is said to be “ready to use” since it is not necessary to mix it with mixing water before it is used.
• the composition according to the present invention is free of lightening fillers. The lightening is obtained thanks to the simultaneous presence of the air-entraining agent and glycerin and does not require the compulsory presence of lightening loads. 3 However, the composition contains lightening loads, the relief will only be improved.
• the composition may comprise up to 30% by weight of lightening fillers chosen from expanded clay, expanded shale, pumice, expanded polystyrene (or EPS), cork, cenospheres including fly ash, expanded glass, vermiculite or perlite.
• lightening fillers chosen from expanded clay, expanded shale, pumice, expanded polystyrene (or EPS), cork, cenospheres including fly ash, expanded glass, vermiculite or perlite.
• the amount of these charges is in particular variable according to their apparent density.
• the percentages of the various constituents of the composition are given in percentage by weight relative to the total weight of the dry composition or paste.
• the amounts indicated for the various components are given before mixing with the amount of water required for mixing.
• the term "leaching charges” is intended to mean fillers having a particle density of between 10 and 1000 kg / m 3 , such as expanded clays, expanded shales, pumice stones, expanded polystyrenes, cenospheres including fly ash, expanded glass, vermiculite or perlite, cork or other light loads conventionally used in the field of building materials.
• the mortar or concrete composition is in the form of a mixture comprising aggregates, fibers, binders and other additives (eg, starch ether, water repellent, fluidizing agent, fibers, air entraining agent. ).
• additives eg, starch ether, water repellent, fluidizing agent, fibers, air entraining agent.
• Glycerol or glycerol of empirical formula CsHsC is 1,2,3-propanetriol. It is a by-product of the transesterification reaction of vegetable oils used in biodiesel production processes. Ble occurs naturally in liquid form. In the process according to the present invention, it is possible to use glycerin in liquid form. It is also possible that it is encapsulated in an envelope or that it is adsorbed on a solid component: it is therefore comparable to an ide soil. In these two cases (encapsulation and adsorption) we speak of a sol state.
• glycerine can be introduced into the process in different ways.
• Glyceri can not be introduced during the preparation of the dry or paste composition.
• B can also be introduced after the preparation of the dry or paste composition at the site of use.
• the glycerin When the glycerin is integrated directly into the dry composition or paste mortar or concrete, during the preparation of it, whatever the form in which it is presented (solid or liquid), the composition used The process according to the present invention is then "ready to mix” (dry composition) or “ready to use” (paste composition).
• the glycerium used is in the liquid state and can be sprayed onto at least one of the powder components of the composition prior to mixing the various components during manufacture of the mortar composition. This operation is carried out in factories manufacturing dry mortar or paste compositions.
• the glyceroliquid is adsorbed on a filler prior to mixing and preparing the composition.
• it can be adsorbed on a filler having a high specific surface, for example a filler having a specific surface area greater than 10 m 2 / g.
• This filler may be one of the constituents of the mortar or concrete composition, or may be a specific charge dedicated to the adsorption of glycerine.
• the liquid glycerine can also be sprayed onto a filler, for example of the sand type, at the time of preparation of the dry mortar or paste composition.
• the liquid glycerine may also be introduced into the mixer used for the manufacture of a paste mortar composition, without it having been previously absorbed or sprayed onto any charge.
• glycerine in the liquid state can be added directly when mixing with water a dry mortar composition at the application site.
• Ble can also be mixed directly on the application site with the paste composition, even if this mode of real isation is not preferred since the paste mortar composition can no longer be considered "ready for use”.
• the glycerine When the glycerine is in the solid state, that is to say when it is encapsulated in an envelope or adsorbed on a charge, it can be considered to be in the form of a powder.
• the glycerin powder can then be introduced together with the other powder constituents (aggregates, binders, mineral fillers, powdery additives, etc.) in the mixer at the site where the dry mortar or paste composition is made.
• the mixing water and the other possible fluid additives are then mixed with this composition at the site of use to obtain a mortar or pasty concrete composition from a composition of dry mortar.
• glycerine in powder form directly on the application site, for example by stirring with the mixing water.
• the binder used in the compositions prepared according to the present invention may be a mineral hydraulic binder chosen from Portland cements, aluminous cements, sulphoaluminous cements, belitic cements, blast furnace slags, phosphomagnesium cements, pozzolanic blend cements. optionally comprising fly ash, silica fumes, limestone, calcined shale and / or natural or calcined pozzolans, alone or as a mixture. It can also be a source of calcium sulphate and be selected from plaster or hemihydrate, gypsum and / or anhydrite. It can also be aerial lime or hydraulic lime, natural or artificial. These different types of binders can be used alone or in mixture.
• the binder may also be an organic binder and may comprise polymer dispersions or redispersible powders.
• acrylic or vinyl polymers or co-polymers styrene and butadiene copolymers, styrene and acrylic acid copolymers, vinyl acetate and ethylene copolymers, copolymers of styrene and butadiene copolymers, copolymers of styrene and of acrylic acid, copolymers of vinyl acetate and of ethylene, copolymers of vinyl acetate and vinyl versatate, and their derivatives.
• binders are used in so-called "organic" mortar compositions to prepare for example, adhesives, undercoatings, finishing coatings for thermal insulation from the outside (ITE) or smoothing and floor plasters.
• organic mortar compositions to prepare for example, adhesives, undercoatings, finishing coatings for thermal insulation from the outside (ITE) or smoothing and floor plasters.
• This type of composition is in the form of a paste in which the mixing water is already introduced. The dough usually stored in buckets is directly ready for use.
• Some inorganic binder compositions may also include a powdery organic binder, such as powdered polymeric resins.
• the inorganic and / or organic binder represents between 5 and 50% by weight of the total dry mixture of the various powder constituents, depending on the use chosen for the composition.
• Aggregates are grains of stone, gravel, chippings, pebbles and / or sands whose content varies between 50 and 95% by weight relative to the total dry composition or paste.
• inert fillers also known as calcareous and / or siliceous fillers.
• Their content is generally between 0 and 30% by weight relative to the total dry composition or paste.
• the glycerine when it is in liquid form, is sprayed on the siliceous fillers present in the dry composition or paste.
• the composition used in the process according to the present invention necessarily comprises at least one air-entraining agent, preferentially chosen from anionic, cationic, zwitterionic and / or nonionic surfactants or their mixture. Examples include sulphated or sulphonated compounds.
• Said composition comprises between 0.005 to 0.4% by weight of air-entraining agent relative to the total weight of the dry composition or paste.
• the composition comprises between 0.005 and 0.1% by weight of air-entraining agent relative to the total weight of the dry composition or paste.
• the amount of glycerine varies between 0.3 and 2.5% by weight relative to the total weight of the dry composition or paste.
• the glycerine advantageously makes it possible to stabilize the air bubbles formed by the air-entraining agent and to maintain this stability as long as the composition is in the pasty state.
• the composition used in the process according to the present invention further comprises, preferably, a viscosifying agent. Examples include polyvinyl alcohols, starch ethers, cellulose ethers, guar ethers, polyamides, clays as a viscosity agent. 3 ⁇ 4 presence makes it possible to reinforce the stability of the air bubbles, forming a network crosslinking.
• the amount of viscosity agent present in the composition according to the present invention is between 0.01 and 0.5% by weight relative to the total weight of the dry composition or paste.
• the amount of polyvinyl alcohol represents less than 0.1% by weight relative to the total weight of the dry composition or paste.
• the composition according to the present invention therefore comprises at most 0.1% by weight of polyvinyl alcohol relative to the total weight of the dry composition or paste.
• additives or adjuvants conferring particular properties to the concrete or mortar composition may be added.
• rheological agents such as plasticizers or super plasticizers, water-retaining agents, thickening agents, biocidal and / or fungicidal agents, dispersing agents, pigments, accelerators and / or retarders, fibers and also other agents to improve the setting, hardening and / or stability of the mortar or concrete after application, to adjust the color, the workability, the implementation or the impermeability.
• the total content of additives and adjuvants conventionally varies between 0.001 and 5% by weight relative to the total weight of the dry or paste composition. These additives are generally included in the formulations of the dry composition.
• the present invention also relates to a composition of mortar or wet concrete, obtainable by the method described above.
• a composition is characterized in particular by a density of less than 1800 kg / m 3 in the cured state and a good stability of the dough.
• the stability of the entrained air in the wet composition is measured according to the conditions defined in EN 196-1, by measuring the density of the paste immediately after mixing (t 0 ) and then 30 minutes after mixing (t 3 o) - 9 the variation in volumetric mass between these two measurements is less than 100 g / 1, the dough is considered stable.
• the present invention also relates to construction products such as wall coatings, floor coatings or lightweight screeds, as well as mortars, repair mortars, patching mortars, organic adhesives, finishing coatings, organic undercoatings ITE or organic patching compounds obtained by curing the mortar or wet concrete composition as described above.
• construction products such as wall coatings, floor coatings or lightweight screeds, as well as mortars, repair mortars, patching mortars, organic adhesives, finishing coatings, organic undercoatings ITE or organic patching compounds obtained by curing the mortar or wet concrete composition as described above.
• the apparent volumic masses and the mechanical properties of the cured products are measured on specimens at 7 and 28 days in accordance with the NF EN 196-1 standard on 4x4x16 cm test pieces. The dimensional and weight variations of the specimens are also measured.
• Example 1 formulation of facade plaster monolayer al legé
• a conventional lightened mortar composition is prepared using lightening fillers from a composition currently marketed under the name weber.
• lite F by mixing 21 g of water with 100 g of this powdery composition (mixing rate of 21 ° /).
• This product is classified as C9I W2, that is to say that it has a compressive strength after 28 days between 1, 5 and 5 MPa and that the adsorption of water by capillarity is less than 2 kg / m 2 . min 0 5 .
• a Putzmeister SP1 type spraying device a wet mortar composition is stripped by mixing for 4 to 10 minutes and then the resulting mix is applied in a 15 mm pass on a masonry support.
• the product consumption on proj ection for a thickness of 15 mm is of the order of 20 kg / m 2 .
• a lightened dry mortar composition A is prepared according to the process of the present invention by mixing the following components in the proportions indicated in Table 1 below.
• constituent (by weight) Composition A is indicated in Table 1 below.
• the mixing rate to prepare this wet coating composition is 17% (thus 17 g of water are mixed with 100 g of powder corresponding to the mixture described above), so as to obtain a paste whose implementation. is identical to that obtained with the commercial product weber.lite F.
• the glycerin is introduced in liquid form, directly with the mixing water.
• a Putzmeister SP11 type projection device a wet mortar composition is stripped by mixing for 4 to 10 minutes and then the resulting mix is applied in a 15 mm pass on a masonry support.
• the mechanical characteristics are measured and summarized in Table 2 below.
• the density is measured immediately after projection of the coating (to), then after 30 min (t 3 o) and finally in the cured state after 28 days.
• Capillary absorption is measured to evaluate the structure of the porosity of the coating.
• the dimensional variations reflect the evolution of the shrinkage conventionally measured on 2x4x16 samples stored at a temperature of 23 ° C in a medium at 50% relative humidity. Density at t0 (after 1550 projection) in kg / m 3
• the small difference between the densities measured at t 0 and t 3 o shows the stability of the entrained air.
• the mortar composition thus obtained is lightened and has a compressive strength compatible with the desired applications, and controlled shrinkage.
• the mortar thus obtained is classified C9I W2 and is therefore quite comparable to that obtained with the weber.lite F product based on reducing loads. .
• Example 2 monolayer coating formulations
• composition B2 to B5 were made from a monolayer coating composition of weber.pral F type (composition B1) in which various constituents were added (cellulose ether, air entrainer, glycerin and or polyvinyl alcohol). The mixtures are made in the laboratory by mixing the various constituents in a lem planetary mixer at a speed of 60 rpm for a period of 90 seconds.
• compositions B2 and B3 are compositions according to the present invention which show that in the presence of glycerin and possibly polyvinyl alcohol, it is possible to obtain a mortar lighter than the control composition B1 for which no addition has been performed, with also very good stability of the entrained air.
• composition B4 not according to the invention
• the density is greatly reduced at t 0 but the stability of the entrained air is very poor.
• the composition B5 (not according to the invention) which comprises a larger amount of air entrainer: the density decreases but the stability of the air is not satisfactory.
• the differences between the densities at t 0 and t 3 o is greater than 100 g for the compositions B4 and B5, indicating a high instability of the entrained air.
• compositions C2 and C3 correspond to compositions without lightening fillers implemented according to the method of the present invention.
• Composition C1 is a comparative composition comprising expanded clays as lightweight fillers.
• Glycerin is introduced in liquid form directly with the mixing water.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Ceramic Engineering (AREA)
• Materials Engineering (AREA)
• Structural Engineering (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Inorganic Chemistry (AREA)
• Curing Cements, Concrete, And Artificial Stone (AREA)

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• 2015
  • 2015-07-23 FR FR1556999A patent/FR3039145A1/fr not_active Withdrawn
• 2016
  • 2016-07-22 WO PCT/FR2016/051913 patent/WO2017013376A1/fr unknown
  • 2016-07-22 EP EP16753953.5A patent/EP3325424A1/de not_active Withdrawn

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