KR101670415B1 - High Early Strength Concrete Composition Using Seaweeds and Constructing Methods Using Thereof - Google Patents

Abstract

The present invention provides a high early strength concrete composition using seaweeds. The high early strength concrete composition, on the basis of 100 parts thereof, comprises: 3 to 20 parts by weight of seaweeds; 20 to 80 parts by weight of an acrylic resin; 10 to 1,000 parts by weigh of an aggregate; 10 to 70 parts by weight of ash; 10 to 70 parts by weigh of blast furnace slag; 10 to 70 parts by weight of silica fume; 10 to 60 parts by weigh of silica powder; 10 to 60 parts by weight of metakaolin; 10 to 50 parts by weight of calcium sulfoaluminate; 0.1 to 5 parts by weight of a retardant; 5 to 20 parts by weight of powder; and 0.01 to 10 parts by weight of a high function water reducing agent. The high early strength concrete composition according to the present invention can be applied not only to high-rise buildings, large structures, and bridge posts but also to various sorts of civil engineering and/or architectural works including repairing, reinforcement, cut slope works, and slope grading works.

Description

Technical Field [0001] The present invention relates to a crude steel concrete composition using seaweed, and a construction method using the same. [0002]

The present invention relates to a crude steel concrete composition, and more particularly, to a crude steel concrete composition using a seaweed to rapidly exhibit the required stiffness of a concrete composition used in construction and / or civil engineering.

In recent years, in order to maximize the efficiency of land, the frequency of construction and construction of skyscraper has increased, and structures of various structural types such as large-scale space construction such as concrete dome, highway pier and long bridge have been constructed, The use of high performance concrete is increasing.

Especially, high-strength concrete is very important as a structural material for high-rise buildings or under-floor columns and beams of large buildings.

As an example of such a high-strength concrete, Korean Patent Laid-Open Publication No. 2011-0077395 discloses a concrete composition comprising 24 to 64% by weight of an inorganic binder, 70 to 30% by weight of an aggregate and 0.1 to 6% by weight of an admixture.

Korean Patent Laid-Open Publication No. 1999-016686 discloses a crude steel concrete composition including an aged steel cement, silica fume, and a high-performance AE water reducing agent.

On the other hand, the crude steel Portland cement has an excellent workability as compared with general cement, but it has a high permeability and corrosion of concrete due to penetration of chloride or moisture.

Especially, since the curing time of cement concrete is long due to its characteristics, it is difficult to use it for urgent repair work which must be completed within a short time due to the characteristics of the work.

Recently, polymer cement concrete with polymer emulsion added to concrete has been increasingly used to overcome the shortcomings of crude steel Portland cement used for emergency repair.

However, the existing polymer cement concrete provides a cause of increase of the construction cost by using expensive polymer dispersion.

In addition, polymeric cement concrete with ultra low velocity is likely to cause initial plastic cracking due to rapid evaporation of initial moisture due to the characteristics of the material itself, and it is easy to cause cracking due to high shrinkage and hydration heat.

The present invention
Based on 100 parts by weight of cement,
3 to 20 parts by weight of seaweeds;
20 to 80 parts by weight of an acrylic resin;
10 to 1,000 parts by weight of aggregate;
10 to 70 parts by weight of blast furnace slag;
10 to 70 parts by weight of silica fume;
10 to 60 parts by weight of silica powder;
10 to 60 parts by weight of meta-kaolin;
10 to 50 parts by weight of calcium sulfoaluminate;
0.1 to 5 parts by weight of a retarding agent;
5 to 20 parts by weight of powder; And
And 0.01 to 10 parts by weight of a high-performance water reducing agent,
Further comprising 1 to 5 parts by weight of magnesium silicate based on 100 parts by weight of cement,
Further comprising 0.5 to 3 parts by weight of natural cellulose fiber based on 100 parts by weight of cement,
Further comprising 1 to 3 parts by weight of sodium bentonite based on 100 parts by weight of cement,
Further comprising a modified silane silicate compound prepared by mixing silicate and silane in an amount of 20 to 60 parts by weight based on 100 parts by weight of cement,
Further comprising 0.1 to 5 parts by weight of the catalyst based on 100 parts by weight of the cement,
Further comprising 1 to 10 parts by weight of tetraethylenepentamine based on 100 parts by weight of cement,
And 1 to 10 parts by weight of a crosslinked polyacrylate salt based on 100 parts by weight of cement.

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In addition,
Removal of foreign objects on the construction surface after cleaning - Cleaning step;
3 to 20 parts by weight of algae, based on 100 parts by weight of the surface on which the foreign matter removal-cleaning step has been completed; 20 to 80 parts by weight of an acrylic resin; 10 to 1,000 parts by weight of aggregate; 10 to 70 parts by weight of ash; 10 to 70 parts by weight of blast furnace slag; 10 to 70 parts by weight of silica fume; 10 to 60 parts by weight of silica powder; 10 to 60 parts by weight of meta-kaolin; 10 to 50 parts by weight of calcium sulfoaluminate; 0.1 to 5 parts by weight of a retarding agent; 5 to 20 parts by weight of powder; And 0.01 to 10 parts by weight of a high-performance water reducing agent, magnesium silicate is further added in an amount of 1 to 5 parts by weight based on 100 parts by weight of cement and 0.5 to 3 parts by weight of natural cellulose fibers based on 100 parts by weight of cement Further comprising sodium bentonite in an amount of 1 to 3 parts by weight based on 100 parts by weight of cement, and further comprising 20 to 60 parts by weight of a modified silane silicate compound prepared by mixing silicate and silane, based on 100 parts by weight of cement, And 0.1 to 5 parts by weight based on 100 parts by weight of cement, wherein the tetraethylenepentamine is further added in an amount of 1 to 10 parts by weight based on 100 parts by weight of cement, and the crosslinked polyacrylate salt is used in an amount of 1 to 100 parts by weight, 10 parts by weight of a crude steel concrete composition is mixed with water, Installation steps; And
And a curing step of curing the crude steel concrete composition after the pouring step is completed.

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The crude steel concrete composition according to the present invention can be applied not only to high-rise buildings, large buildings, piers, but also to various civil engineering and / or building works such as repairing, reinforcement, incision surface and slope theorem requiring high strength.

Hereinafter, the present invention will be described in detail.

In one aspect, the crude steel concrete composition according to the present invention comprises, based on 100 parts by weight of cement, 3 to 20 parts by weight of seaweeds; 20 to 80 parts by weight of an acrylic resin; 10 to 1,000 parts by weight of aggregate; 10 to 70 parts by weight of ash; 10 to 70 parts by weight of blast furnace slag; 10 to 70 parts by weight of silica fume; 10 to 60 parts by weight of silica powder; 10 to 60 parts by weight of meta-kaolin; 10 to 50 parts by weight of calcium sulfoaluminate; 0.1 to 5 parts by weight of a retarding agent; 5 to 20 parts by weight of powder; And 0.01 to 10 parts by weight of a high-performance water reducing agent.

According to another aspect of the present invention, there is provided a cleaning method comprising: a foreign matter removal-cleaning step of removing foreign matters on a construction surface and cleaning the foreign matter;

3 to 20 parts by weight of algae, based on 100 parts by weight of the surface on which the foreign matter removal-cleaning step has been completed; 20 to 80 parts by weight of an acrylic resin; 10 to 1,000 parts by weight of aggregate; 10 to 70 parts by weight of ash; 10 to 70 parts by weight of blast furnace slag; 10 to 70 parts by weight of silica fume; 10 to 60 parts by weight of silica powder; 10 to 60 parts by weight of meta-kaolin; 10 to 50 parts by weight of calcium sulfoaluminate; 0.1 to 5 parts by weight of a retarding agent; 5 to 20 parts by weight of powder; And 0.01 to 10 parts by weight of a high-performance water reducing agent are mixed with water and poured; And

And a curing step of curing the crude steel concrete composition after the pouring step is completed.

The cement according to the present invention may use special Portland cement, blast furnace slag cement, ultrafine powder cement, and other special cements.

The preferred powder of the cement is preferably 3,200 to 6,500 cm ² / g.

The content of the components other than cement in the crude steel concrete composition according to the present invention is based on 100 parts by weight of cement.

The seaweeds according to the present invention are provided to prevent the concrete composition, specifically the crude steel concrete composition, contained in the concrete composition from being shrunk during drying and curing and being easily broken due to its fragility and weak impact strength.

Particularly, the seaweed according to the present invention performs the same function as latex used in LMC (Latex Modified Concrete) method. Since seaweeds act independently during concrete pouring work, the flowability of concrete increases, In the hydration reaction process, a seaweed particle film is formed around the cement hydrate to increase the adhesion, and after the hardening, the micropores in the concrete are filled with algae to suppress the occurrence of cracks.

In addition, the seaweed promotes bonding between components constituting the crude steel concrete composition and prevents cracking.

Here, since about 8,000 species of algae live in the world and about 500 species live in the sea of Korea, all of them can be used, but it is preferable to use at least one of green algae, brown algae, red algae, or at least one of them as preferable algae.

Examples of the preferable algae include, but are not limited to, green algae include, but are not limited to, seaweed, hallaria, chrysanthemum, sea bass, parasitoids, However, the present invention is not limited thereto, and the red algae may be selected from the group consisting of red algae such as red algae, black algae, Can be used, such as bamboo, bamboo, bamboo, bamboo, bamboo, bamboo, bamboo, bamboo, bamboo, bamboo, bamboo, But is not limited thereto.

As a specific aspect, seaweeds according to the present invention may be used in the form of dried seaweeds, seaweeds in the form of powders or concentrates in concentrated form, but it is advisable to use a solid form of dried powder after being dried.

The preferred amount of algae to be used is 3 to 20 parts by weight based on 100 parts by weight of cement.

The acrylic resin according to the present invention is intended to provide an excellent adhesive force of the crude steel concrete composition and to maintain excellent physical properties of the binder and mechanical properties and to remarkably improve the cracking and dropping phenomenon even after rapid curing after pouring, The acrylic resin is not particularly limited as long as it is a conventional acrylic resin having such a purpose.

The acrylic resin is preferably acrylic acid, methacrylic acid, acrylate, methyl methacrylate, acrylic copolymer resin or a mixture thereof. The amount of the acrylic resin is preferably 20 to 80 parts by weight based on 100 parts by weight of the cement.

The methyl methacrylate is obtained by mixing 49 to 70% by weight of a low viscosity methyl methacrylate resin having a viscosity of 10 to 1,000 cps and 20 to 50% by weight of high viscosity methyl methacrylate having a viscosity of 2,000 to 20,000 cps Modified methyl methacrylate in which 1 to 10% by weight of a mixture of at least one selected from styrene isoprene styrene (SIS), styrene butadiene rubber (SBR), and styrene butadiene styrene (SBS) is mixed with the methyl methacrylate mixture may be used.

When the content of SIS, SBR and / or SBS is less than 1% by weight, cracks may occur due to lowering of impact resistance at the time of charging. When the content exceeds 10% by weight, the viscosity of the modified methyl methacrylate resin Which may cause problems in workability.

The aggregate according to the present invention is a construction-use mineral material that can be consolidated into a lump by a binder such as concrete, and is chemically stable.

The aggregate refers to sand, gravel, basalt, o-stone, basalt and other similar materials that are mixed with cement and water to make concrete.

Specifically, the aggregate may further include basic rock carcasses having a particle size of about 25 mm and an absorption rate of about 0.7% and / or bauxite having a particle size of about 5 mm and an absorption rate of 5.40%.

The aggregate having a size of 0.074 mm or more but less than 4.76 mm is called a fine aggregate, and a material having a diameter of 4.76 mm or more is called a coarse aggregate. The amount of the aggregate to be used is preferably 10 to 1,000 parts by weight based on 100 parts by weight of the cement. The amount of the fine aggregate and the coarse aggregate contained in the aggregate is not particularly limited and may be appropriately adjusted as necessary.

The blast furnace slag according to the present invention is a slag produced when pig iron is made from iron ore in a furnace, and impurities other than iron are collected, and 500 to 1,000 kg per 1 ton of pig iron is used and used as a concrete admixture.

The content of the blast furnace slag is not particularly limited and can be appropriately adjusted as needed. For example, the blast furnace slag may be used in an amount of 10 to 70 parts by weight based on 100 parts by weight of cement.

Here, the amount of cement used can be reduced by substituting a certain amount of slag, which is an industrial by-product, specifically blast furnace slag and ash, into cement contained in concrete.

The silica fume according to the present invention is a by-product produced when a metal silicon or a silicon alloy is produced, and is amorphous silicon dioxide.

The silica fume is preferably used in an amount of 10 to 70 parts by weight based on 100 parts by weight of cement.

In a particular embodiment, the silica fume according to the present invention may comprise zirconium silica fume.

At this time, the zirconium silica fume is a by-product generated in the production of zirconia, which contains zirconium oxide in an amount of 3 to 5% by weight and has a unit volume weight of 200 to 300 kg / m ³ and a powder of 100,000 to 150,000 cm ² / g And a particle size of from 0.3 to 1 micrometer.

Silica fume, which is commonly used in the art, is amorphous silicon dioxide, and its particle size is smaller than the cement particle size. When added to a concrete composition or the like, the viscosity increases and a high compressive strength can be obtained. However, the zirconium silica fume has a large particle size It can be dispersed well between the cement particles to lower the viscosity and improve the fluidity.

The zirconium silica fumarate is an amorphous zirconium zirconium zirconium zirconium zirconium zirconium zirconium zirconium zirconium zirconium zirconium zirconium zirconium zirconium zirconium zirconium zirconium zirconium zirconium zirconium zirconium zirconium zirconium zirconium zirconium

Thus, the silica fume according to the present invention can be used by mixing silica fumes commonly used in the art, such as amorphous silicon dioxide and zirconium silica fume. In this case, the zirconium silica fume may be used in an amount of 20 To 50 parts by weight.

The silica powder according to the present invention is intended to provide silica in the curing step, particularly in the curing step and specifically in the autoclave curing step. The amount of the silica powder to be used is not particularly limited, but is preferably 10 to 60 It is good to be in weight.

Here, the size of the silica powder is not particularly limited, but preferably has a particle size of 50 to 300 nm.

The meta-kaolin according to the present invention reacts with water mainly composed of aluminum oxide and amorphous silicon oxide and exhibits pozzolanic reactivity upon hydration.

Unlike fly ash or silica fume, the metakaolin improves its initial strength rapidly at the initial stage of hydration and reacts with Ca (OH) ₂ generated during the cement hydration process in the organs to form CASH silicate hydroxide hydrate, which improves strength by making the pores more dense as compared to concrete made using conventional cement.

The amount of such meta kaolin to be used is not particularly limited, but it is preferable to use 10 to 60 parts by weight based on 100 parts by weight of cement.

The calcium sulfoaluminate according to the present invention is a material for imparting shrinkage compensation, high strength, for example, high compressive strength, bending strength and rapid hardness. Any calcium sulfoaluminate having such a purpose can be used And it is recommended that the amount thereof is 10 to 50 parts by weight based on 100 parts by weight of cement.

The calcium sulfoaluminate reacts instantly when it comes into contact with water to produce an ettringite hydrate, so that the compressive strength of the cement can be obtained within several minutes to several hours.

At this time, ultrafine amorphous calcium sulfoaluminate may be used for a quick hydration reaction.

The blast powder of the ultrafine amorphous calcium sulfoaluminate used for increasing hydration reactivity is preferably about 5,000 to 8,000 cm 2 / g.

As a specific aspect, the crude steel concrete composition according to the present invention may further include a gypsum which can be cured by reacting with the calcium sulfoaluminate or the like for faster curing.

As the preferable gypsum, anhydrous gypsum and / or desulfurized gypsum can be used, and it is recommended to use desulfurization gypsum more preferably.

Here, the desulfurized gypsum is a gypsum produced in the desulfurization process, which is environmentally friendly since the sulfur component is excluded, and the by-product of the desulfurization process is recycled.

The amount of the gypsum to be used is not particularly limited, but it is preferably 2 to 10 parts by weight based on 100 parts by weight of cement.

The retarder according to the present invention is for controlling the working time and / or the speed of development of the strength, and any of those conventionally used in the art may be used for this purpose. Preferably, however, tartaric acid, citric acid, gluconic acid , Or a salt thereof, or a mixture of at least one selected from the foregoing, is preferably used. The amount of the carboxylic acid to be used is preferably 0.1 to 5 parts by weight based on 100 parts by weight of the cement.

The powder according to the present invention is included in the crude steel concrete composition and functions as a binder.

The powder includes a ceramic binder, silica, or a mixture thereof in powder form, and the particle size of the powder is not particularly limited, but preferably has several micrometers or several nanometers.

Here, the ceramic binder and silica sand constituting the powder are preferably such that the amount of the ceramic binder is more than 40% by weight based on 100% by weight of the whole powder, and the amount of the remaining silica is 60% by weight. It is adjustable accordingly.

However, the powder may be composed of only silica sand without using the ceramic binder.

The ceramic binder may be a mixture of sodium silicate, potassium silicate, lithium silicate, or a mixture of at least one of these.

As the amount of the ceramic binder to be used increases, the color, weatherability, adsorption force and coloring effect are increased, and carbon dioxide floating in the air is absorbed and absorbed through the whole of the ultraviolet wavelength region and the visible light wavelength region Ultraviolet stabilizer can be given.

The amount of the powder according to the present invention is preferably 5 to 20 parts by weight based on 100 parts by weight of the cement.

The high-performance water reducing agent according to the present invention is an admixture used to uniformly disperse small air bubbles in a concrete when constructing a concrete. It has a good foaming property and generates small bubbles evenly in the concrete to provide excellent resistance to freezing and thawing, corrosion resistance, durability And so on.

Particularly, the water reducing agent is added to the pre-mixed base concrete to make it smoother by stirring it, and is used for the purpose of improving the workability of the concrete without deteriorating the quality of the concrete.

Furthermore, the water reducing agent has a secondary effect such as facilitating the pouring work by improving the fluidity of the concrete composition, lowering the thermal conductivity of hard concrete, and improving water tightness.

At this time, the water reducing agent used in the concrete composition generally has a water reducing rate of about 10 to 15%, but a water reducing rate of 20 to 30% is generally referred to as a high-performance water reducing agent in the present invention.

The preferred high performance water reducing agent is preferably a naphthalene type, a melamine type, a polycarboxylic acid type, an aminosulfonic acid type water reducing agent or a mixture thereof. The content thereof is not particularly limited and can be appropriately adjusted as required. 0.01 to 10 parts by weight may be used.

Typical examples of the naphthalene-type water reducing agent include modified lignin, alkylarylsulfonic acid and active persistent polymer, polyalkylisulfonic acid salt and reactive polymer, alkylarylsulfonic acid salt condensate, sulfonic acid group carboxyl group-containing polyaromatic polymer, alkylnaphthalenesulfonic acid salt, Sulfonic acid salt-modified lignin co-condensates, modified lignin, lignin derivatives and alkylaryl sulfonates, or at least one selected from these.

Typical examples of the melamine-type water reducing agent include a modified methylmelamine condensate and a water-soluble special polymer compound, a sulfonated melamine condensate, and a mixture of at least one selected from the foregoing.

Representative examples of the polycarboxylic acid type water reducing agent include a copolymer containing an unsaturated carboxylic acid monomer as a single component or a salt thereof such as poly (alkylene glycol) monoacrylate, poly (alkylene glycol) monomethacrylate, Styrene copolymers, copolymers of acrylates and methacrylates, and copolymers derived from monomers copolymerizable with these monomers.

Representative examples of the aminosulfonic acid-based water reducing agent include an aromatic aminosulfonic acid-based polymer compound, an aromatic polymer condensate and a lignin sulfonic acid derivative, or a mixture of at least one selected from the foregoing.

It is also preferable to use a naphthalene-type high-performance water reducing agent alone or a mixed composition comprising 80 to 95 wt% of a naphthalene-based high-performance water reducing agent and 5 to 20 wt% of a polycarboxylic acid-type high-

The amount of the high-performance water reducing agent is preferably such that the total amount of air in the concrete is about 4 to 6% by volume. If it is used too much, it will not only be economical but also cause various obstacles such as reduction of compressive strength and deterioration of bond strength with reinforcing steel, so proper usage should be strictly observed.

As a specific example, in order to improve the strength of the crude steel concrete composition according to the present invention, a polymer resin such as a phenol resin, a urea resin, a melamine resin, an alkyd resin, an unsaturated polyester resin, a polyurethane resin, Or a thermosetting polymeric resin composed of a mixture thereof.

At this time, the content of the polymer resin is not particularly limited, but it is preferable that the content of the polymer resin is 5 to 30 parts by weight based on 100 parts by weight of cement contained in the crude steel concrete composition.

In another specific embodiment, when the crude steel concrete composition contains a polymer resin, it may further include a hardener and / or a water reducing agent.

The curing agent and / or the water-reducing agent may be those conventionally used in the art, but it is preferable to use hexamethylenetetramine, amines, polyamide or the like as a curing agent. As the low-shrinkage agent, unsaturated polyester- It is good to use festivals.

The amount of the curing agent and / or the water-reducing agent is preferably 0.5 to 20 parts by weight based on the total weight of the polymer resin, either singly or in combination.

In another specific embodiment, the crude steel concrete composition according to the present invention may further comprise 1 to 10 parts by weight of a coagulation retarding agent based on 100 parts by weight of the cement.

The above-mentioned coagulation retarder is intended to prevent the loss of the coagulation performance by rapidly reacting the calcium sulfoaluminate constituting the crude steel concrete composition with water, when the calcium sulfoaluminate is dispersed in water, and it is an object of the present invention to provide a coagulation- There is no particular limitation as long as it is a condensation retarder, but it is preferable to use organic acids such as citric acid, gluconic acid, boric acid, tartaric acid and the like, and organic acid salts such as sodium citrate and sodium gluconate, more preferably sodium citrate good.

In another specific embodiment, the crude steel concrete composition according to the present invention may further comprise 1 to 5 parts by weight of an antidegradant based on 100 parts by weight of cement.

Here, the deterioration inhibitor is used for preventing deterioration of the crude steel concrete composition, and any conventional deterioration inhibitor in the art having such an object may be used.

Preferable antioxidants, specifically ozone deterioration inhibitors, include 6PPD (N- (1,3-dimethylutyl) -N'- phenylphenylenediamine) and / or TAPDT (2,4,6-

The accelerated deterioration action of the concrete composition due to the oxidative action of ozone radicals activated in water, including 1,4-dimethylpentyl-p-phenylenediamino) -1,3,5-triazine, The double bond portion of the aromatic ring compound macromolecule is offset with the ozone radical activated by the free electron transfer phenomenon, so that deterioration prevention and deterioration of the concrete composition can be delayed.

That is, the ozone deterioration inhibitor may be a phenylenediamine-based wax, a mixed resin composition containing 6PPD and TAPDT, or an aromatic polyamine system in which radical generation is active. In particular, phenylenediamine- It is preferable to use a system.

In another specific embodiment, the crude steel concrete composition according to the present invention further comprises an amino-functional siloxane to effectively cure at room temperature and to provide improved properties such as heat resistance, low temperature performance, chemical resistance, solvent resistance and oil resistance can do.

The amino-containing siloxane is not particularly limited, and examples thereof include aminomethylpolydimethylsiloxane. The amount of the amino-containing siloxane is preferably 1 to 8 parts by weight based on 100 parts by weight of cement.

In another specific embodiment, the crude steel concrete composition according to the present invention may further include an absorbent polymer which is excellent in workability by absorbing water during mixing of the concrete composition, thereby reducing the unit yield of the concrete and enhancing the strength .

The water absorbent polymer may be at least one selected from the group consisting of a polyacrylate salt and a derivative thereof and a polyethylene oxide derivative. The amount of the water absorbent polymer is preferably 2 to 15 parts by weight based on 100 parts by weight of the cement.

In another specific embodiment, the crude steel concrete composition according to the present invention may further contain octyltriethoxysilane to improve adhesion and adhesion strength of the concrete composition.

The octyltriethoxysilane can be used in the form of a monomer. The molecular weight of the monomer is not particularly limited, but is preferably 150 to 450 Da, and the amount thereof is 5 to 20 parts by weight based on 100 parts by weight of cement I recommend you.

In another specific embodiment, the crude steel concrete composition according to the present invention may further contain magnesium silicate in an amount of 1 to 5 parts by weight based on 100 parts by weight of the cement in order to prolong the life of the composition.

Since the magnesium silicate has excellent chemical resistance, chemical resistance and weathering resistance, the life of the concrete composition is prolonged.

In another specific embodiment, the crude steel concrete composition according to the present invention may further include a natural cellulose fiber in order to prevent cracks that might occur on the surface depending on the drying speed.

The natural cellulose fibers are preferably used in a range of 0.5 to 3 parts by weight based on 100 parts by weight of cement.

In another specific embodiment, the crude steel concrete composition according to the present invention may further contain sodium bentonite in an amount of 1 to 3 parts by weight based on 100 parts by weight of cement in order to compact the pores, prevent water leakage, and improve the strength.

The sodium bentonite absorbs a large amount of water and expands to several times its original volume, and becomes a gel-like state, so that the pores of the composition become dense and dense, thereby preventing water leakage and improving strength and contributing to prevention of cracks.

In another specific embodiment, the crude steel concrete composition according to the present invention may contain 20 to 60 parts by weight of a modified silane silicate compound based on 100 parts by weight of cement to improve crack resistance, water resistance, stain resistance, abrasion resistance and / As shown in FIG.

Herein, the modified silane silicate compound acts as a crosslinking agent to improve the tackiness of the composition by forming organic-inorganic polymerization reactivity.

The modified silane silicate compound can be prepared by mixing silicate and silane.

The preferred silicate may be any silicate commonly used in the art, but more preferably an alkali silicate, particularly preferably a lithium silicate, a pure potassium silicate, a pre-treated potassium silicate, a synthetic silicate (lithium, , Potassium), colloidal silica, or a mixture of at least one selected from these. However, the present invention is not limited thereto.

The preferred silane may be any silane commonly used in the art, but it may be any one selected from aminosilane, vinylsilane, epoxysilane, methacrylsilane, sulfur, alkylsilane, phenylsilane, vinyltrichloro Silane, n-hexyltriethoxysilane, aminoethylaminopropylsilane, phenyltrimethoxysilane, vinylbenzylaminoethylaminopropyltrimethoxysilane, methyldimethoxysilane, methacryloxypropyltrimethoxysilane, aminoethylamino It is preferable to use at least one selected from the group consisting of propyltrimethoxysilane, vinyltrimethoxysilane, tetraethoxysilane (TEOS), 3 glycidoxypropyltrimethoxysilane, aminopropyltrimethoxysilane, and mixtures thereof. However, the present invention is not limited thereto.

The method for preparing the modified silane silicate compound by mixing the silicate and the silane is not particularly limited, but preferably 0.1 to 2 parts by weight of silane is added to the silicate at a temperature ranging from 95 to 110 占 폚 based on 100 parts by weight of the silicate And stirring for 1 to 2 hours at a speed of 200 to 400 rpm.

In another specific embodiment, the crude steel concrete composition according to the present invention may further include nanoceramic particles.

Preferred nanoceramic particles include silicon carbide, alumina, silica, zirconia-silica, ZnO, TiO ₂ and / or CaCO ₃ .

Preferably, the average particle size of the ceramic particles is in the range of 300 to 500 nm, the average particle size of the alumina is 500 to 1000 nm, the average particle size of the silica is 700 to 1500 nm, the zirconia- It is preferable that the average particle size of silica is 500 to 1000 nm, the average particle size of ZnO is 500 to 1000 nm, the average particle size of TiO ₂ is 100 to 300 nm, and the average particle size of CaCO ₃ is 500 to 1000 nm.

Among them, silicon carbide does not exist as natural minerals, so it is synthesized artificially, has excellent chemical stability and corrosion resistance at high temperature, and has high hardness.

The silicon carbide and the alumina ultrafine particle powder float to the surface where the film formation is completed during drying to form a dense and hard coat film. Therefore, it is possible to prevent permeation of water vapor and other gases and liquids and to prevent moisture, durability, , Impact resistance and chemical resistance, and protects the composition from ultraviolet rays.

In addition, due to the excellent thermal stability of silicon carbide and alumina, it prevents shrinkage and expansion of concrete by preventing temperature rise and prevents dewatering / chlorination of resin to maintain durability for a long time.

The amount of the nanoceramic particles to be used may be changed according to the user's choice, but it is preferably 10 to 30 parts by weight based on 100 parts by weight of the cement.

In another specific embodiment, the crude steel concrete composition according to the present invention may further comprise 0.1 to 5 parts by weight of catalyst based on 100 parts by weight of cement.

The catalyst is used for facilitating curing and for easily bonding an algae, an organic material, and a cement other than an inorganic substance to each other. Any catalyst may be used as long as it is an ordinary catalyst in the art having such a purpose, It is advisable to use a fin-tree epoxy silane.

In another specific embodiment, the crude steel concrete composition according to the present invention may further contain 1 to 10 parts by weight of tetraethylenepentamine (TEPA) based on 100 parts by weight of cement for viscosity control and strength enhancement, If the amount is less than 1 part by weight based on 100 parts by weight of pentamethylene cement, the effect is insignificant. If the amount is more than 10 parts by weight, the amount thereof may be excessive, which may adversely affect the physical properties of the crude steel concrete composition.

In another specific embodiment, the crude steel concrete composition of the present invention may further comprise 1 to 10 parts by weight of a crosslinked polyacrylate salt based on 100 parts by weight of cement to prevent moisture penetration and improve durability.

The crosslinked polyacrylate salt fills the voids in the crude steel concrete composition to prevent the penetration of moisture and thus improves the durability of the interior. More specifically, the crosslinked polyacrylate salt is an acrylate Refers to a substance in which a polymer of a salt of a salt is crosslinked and is composed of a copolymer of acrylic acid and sodium acrylate containing acrylic acid as a crosslinking agent and has the following formula (C ₃ H ₄ O ₂ .C ₃ H ₃ O ₂ Na) x.

The crosslinked polyacrylate salt having the above structure can be obtained by crosslinking a polyacrylate salt in the presence of a hydrophilic group in a three-dimensional network structure or a single-chain structure through cross-linking between polymer chains, Thereby filling the internal voids to prevent the penetration of moisture and improving the durability.

The method of constructing using the crude steel concrete composition using seaweeds according to the present invention is not particularly limited as long as it is a method commonly used in the art such as mobile mixing carried out directly in the field, a concrete manufacturing process, and a concrete using method In order to explain the present invention more easily, one example will be described as follows.

First, a foreign matter removal-cleaning step for removing foreign matters on a construction surface to be applied to a crude steel concrete composition using seaweeds and cleaning;

3 to 20 parts by weight of algae, based on 100 parts by weight of cement, 20 to 80 parts by weight of an acrylic resin; 10 to 1,000 parts by weight of aggregate; 10 to 70 parts by weight of ash; 10 to 70 parts by weight of blast furnace slag; 10 to 70 parts by weight of silica fume; 10 to 60 parts by weight of silica powder; 10 to 60 parts by weight of meta-kaolin; 10 to 50 parts by weight of calcium sulfoaluminate; 0.1 to 5 parts by weight of a retarding agent; 5 to 20 parts by weight of powder; And 0.01 to 10 parts by weight of a high-performance water reducing agent are mixed with water and poured; And

And a curing step of curing the crude steel concrete composition after the pouring step is completed.

Hereinafter, the present invention will be described in detail by way of examples. However, the following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

[Example 1]

40 g of silica fume composed of amorphous silicon dioxide, 30 g of silica powder having an average particle size of 200 nm, 30 g of meta kaolin, 25 g of calcium sulfoaluminate, 25 g of calcium sulfoaluminate, 10 g of potassium cement, 10 g of acrylic acid, 40 g of coarse aggregate, , 10 g of a powder mixture of sodium silicate and silica sand in a weight ratio of 1: 1 and 2 parts by weight of a polycarboxylate type high-performance water reducing agent were mixed to prepare a crude steel concrete composition.

[Example 2]

A crude steel concrete composition was prepared in the same manner as in Example 1 except that 40 g of silica fume composed of amorphous silicon dioxide and 60 g of amorphous silicon dioxide and 40 g of zirconium silica fume were used instead of 40 g of amorphous silicon dioxide.

Wherein the zirconium silica fume has a unit volume weight of 250 kg / m ³ , a particle size of 120,000 cm ² / g and a particle size of about 0.5 micrometer.

[Example 3]

15 parts by weight of a polymer resin consisting of 50% by weight of phenol resin and 50% by weight of urea resin was added to 100 parts by weight of cement to prepare a crude steel concrete composition.

[Example 4]

3 g of a curing agent containing hexamethylenetetramine as a main component and 2 g of a water-reducing agent containing an unsaturated polyester as a main component were added in the same manner as in Example 3 to prepare a crude steel concrete composition.

[Example 5]

The same procedure as in Example 1 was followed except that 3 g of citric acid was further added to prepare a crude steel concrete composition.

[Example 6]

The crude steel concrete composition was prepared in the same manner as in Example 1 except that 10 g of octyltriethoxysilane having an average molecular weight of about 200 Da was further added.

[Example 7]

The procedure of Example 1 was repeated except that 7 g of polyacrylate was added to prepare a crude steel concrete composition.

[Example 8]

The same procedure as in Example 1 was followed except that 3 g of magnesium silicate was added to prepare a crude steel concrete composition.

[Example 9]

The same procedure as in Example 1 was carried out except that 2 g of natural cellulose fiber was further added to prepare a crude steel concrete composition.

[Example 10]

The same procedure as in Example 1 was followed except that 2 g of sodium bentonite was further added to prepare a crude steel concrete composition.

[Example 11]

30 g of a modified silane silicate compound prepared by synthesizing lithium silicate and epoxy silane was added in the same manner as in Example 1 to prepare a crude steel concrete composition.

[Example 12]

15 g of silicon carbide having an average particle size of 400 nm was further added as nanoceramic grains in the same manner as in Example 1 to prepare a crude steel concrete composition.

[Example 13]

A crude steel concrete composition was prepared in the same manner as in Example 1 except that 3 g of aminopropane triepoxysilane was added as a catalyst.

[Example 14]

The procedure of Example 1 was repeated except that 5 g of tetraethylene pentamine was further added to prepare a crude steel concrete composition.

[Example 15]

The procedure of Example 1 was followed except that 5 g of crosslinked polyacrylate salt was further added to prepare a crude steel concrete composition.

[Experiment]

The concrete prepared according to the examples was mixed with water to prepare concrete, and the compressive strength and the shrinkage ratio at low temperature and in the standard state were measured and shown in Table 1. The compressive strength was measured by using a concrete compressive strength tester. Dry shrinkage (microns) was measured by a comparator method on 26 specimens of each concrete composition stored at 20 ° C and 60% RH, And the drying shrinkage ratio was determined. The smaller this value, the smaller the drying shrinkage.

Air content (%) Slump (mm) Dry shrinkage () Compressive strength (MPa) 3 days 7 days 28 days Example 1 0.7 225 179 21.1 26.7 75 Example 2 0.8 225 182 26.2 32.8 81 Example 3 0.8 225 181 28.7 31.5 76 Example 4 0.9 220 172 29.3 31.2 79 Example 5 0.8 222 181 25.2 32.5 81 Example 6 0.8 226 180 28.7 31.5 76 Example 7 0.9 221 179 29.3 33.2 82 Example 8 0.9 224 183 28.5 31.5 75 Example 9 0.9 220 173 29.2 31.4 78 Example 10 0.8 225 181 26.2 31.5 81 Example 11 0.9 224 181 27.7 31.5 76 Example 12 0.8 224 178 28.3 31.2 81 Example 13 0.8 225 181 26.2 31.4 81 Example 14 0.9 223 181 27.7 31.5 76 Example 15 0.8 224 178 28.3 31.4 80

As shown in Table 1, the compressive strengths of Examples 1 to 15 using the crude steel concrete composition were more than 75 mega pascals after 28 days passed, and it was confirmed that all the concrete compositions in all the examples in Examples always have high strength.

As described above, those skilled in the art will understand that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the embodiments described above are all illustrative and not restrictive. The scope of the present invention should be construed as being included in the scope of the present invention without departing from the spirit and scope of the present invention as defined by the appended claims and their equivalents.

Claims (5)

Based on 100 parts by weight of cement,
3 to 20 parts by weight of seaweeds;
20 to 80 parts by weight of an acrylic resin;
10 to 1,000 parts by weight of aggregate;
10 to 70 parts by weight of blast furnace slag;
10 to 70 parts by weight of silica fume;
10 to 60 parts by weight of silica powder;
10 to 60 parts by weight of meta-kaolin;
10 to 50 parts by weight of calcium sulfoaluminate;
0.1 to 5 parts by weight of a retarding agent;
5 to 20 parts by weight of powder; And
And 0.01 to 10 parts by weight of a high-performance water reducing agent,
Further comprising 1 to 5 parts by weight of magnesium silicate based on 100 parts by weight of cement,
Further comprising 0.5 to 3 parts by weight of natural cellulose fiber based on 100 parts by weight of cement,
Further comprising 1 to 3 parts by weight of sodium bentonite based on 100 parts by weight of cement,
Further comprising a modified silane silicate compound prepared by mixing silicate and silane in an amount of 20 to 60 parts by weight based on 100 parts by weight of cement,
Further comprising 0.1 to 5 parts by weight of the catalyst based on 100 parts by weight of the cement,
Further comprising 1 to 10 parts by weight of tetraethylenepentamine based on 100 parts by weight of cement,
Wherein the crosslinked polyacrylate salt further comprises 1 to 10 parts by weight based on 100 parts by weight of cement.
The method according to claim 1,
The above-mentioned algae can be used in a variety of seaweeds, such as barnyardgrass, hallaria, chrysanthemum, hermit crab, hearing, beard, beard, jade, salt, seaweed, kelp, , Ginseng mushroom, cow mushroom, mushroom, hornbill mushroom, mulberry, chrysanthemum, chrysanthemum, mugwort, chrysanthemum, kotoni, dog gambling, round starch, , Gravel, short-timber, rock sand, gypsum, ginori, or a mixture of at least one selected from the foregoing.
delete delete Removal of foreign objects on the construction surface after cleaning - Cleaning step;
3 to 20 parts by weight of algae, based on 100 parts by weight of the surface on which the foreign matter removal-cleaning step has been completed; 20 to 80 parts by weight of an acrylic resin; 10 to 1,000 parts by weight of aggregate; 10 to 70 parts by weight of ash; 10 to 70 parts by weight of blast furnace slag; 10 to 70 parts by weight of silica fume; 10 to 60 parts by weight of silica powder; 10 to 60 parts by weight of meta-kaolin; 10 to 50 parts by weight of calcium sulfoaluminate; 0.1 to 5 parts by weight of a retarding agent; 5 to 20 parts by weight of powder; And 0.01 to 10 parts by weight of a high-performance water reducing agent, magnesium silicate is further added in an amount of 1 to 5 parts by weight based on 100 parts by weight of cement and 0.5 to 3 parts by weight of natural cellulose fibers based on 100 parts by weight of cement Further comprising sodium bentonite in an amount of 1 to 3 parts by weight based on 100 parts by weight of cement, and further comprising 20 to 60 parts by weight of a modified silane silicate compound prepared by mixing silicate and silane, based on 100 parts by weight of cement, And 0.1 to 5 parts by weight based on 100 parts by weight of cement, wherein the tetraethylenepentamine is further added in an amount of 1 to 10 parts by weight based on 100 parts by weight of cement, and the crosslinked polyacrylate salt is used in an amount of 1 to 100 parts by weight, 10 parts by weight of a crude steel concrete composition is mixed with water, Installation steps; And
And a curing step of curing the crude steel concrete composition after the pouring step is completed.