KR101456676B1 - Early strength polymer modified cement concrete composite and repairing method of concrete structure using the composite - Google Patents

Abstract

The present invention relates to an ultrahigh early strength cement concrete composition which includes 4-30 wt% of a rapidly hardening binder, 25-65 wt% of fine aggregates, 20-60 wt% of coarse aggregates, 0.1-15 wt% of water, and 0.01-15 wt% of a polymer admixture agent, wherein the rapidly hardening binder is a coupling agent that realizes strength at a material age of 12 hours and generally includes 20-55 wt% of Portland cement, 5-40 wt% of calcium or magnesium sulfoaluminate, 0.1-25 wt% of aluminate, 0.01-20 wt% of plaster, 0.01-20 wt% of blast furnace slag, 0.01-20 wt% of fly ash, 0.01-10 wt% of aluminum hydroxide, and 0.01-10 wt% of barium sulfate, wherein the polymer admixture agent includes 50-99 wt% of methyl methacrylate, 0.1-25 wt% of styrene, 0.1-15 wt% of butyl acrylate, 0.01-10 wt% of polyethylene propylene, 0.01-10 wt% of itaconic acid, 0.01-10 wt% of sodium persulfate, and 0.01-10 wt% of process oil, to a method for manufacturing the same, and to a method for maintaining and repairing a concrete structure using the composition. The present invention can improve work efficiency of concrete and improve durability of concrete, and in particular, can reduce defects of concrete by improving bending strength, tensile strength, initial strength, long-term strength, resistance to chloride attack, and resistance to freezing and thawing.

Description

Technical Field [0001] The present invention relates to a cementitious polymer cement concrete composition, a method of manufacturing the same, and a maintenance method of a concrete structure using the cementitious composition,

More particularly, the present invention relates to a concrete structure, such as a road surface, a bridge bridge, a concrete slab of a bridge, a bridge bottom, and the like. The present invention relates to an aged steel polymer cement concrete composition which can be used for maintenance of a concrete structure, and a maintenance method for a concrete structure using the composition.

Generally, bridges are collectively referred to as high-priced structures that are constructed so as to pass over the upper parts of rivers, coasts, roads, and the like. The bridges are paved so that vehicles can pass smoothly on the surfaces of such bridges, .

The above-mentioned cross-pavement package is a part directly transmitting the traffic load, and it is required to have appropriate strength and crack resistance, as well as to be waterproof due to exposure to moisture such as rainwater, It is required to have a low chloride ion permeability in order to prevent the rebar from being corroded.

Conventionally, a conventional concrete pavement method or an ascon pavement method has been widely known as such a pavement pavement method.

Asphalt pavement is used for most of road pavements because it has ductility, excellent ride quality, low noise, and quick construction. However, because of the durability degradation due to heavy traffic, heavy traffic, It has a problem that the functionality as a road is easily deteriorated, frequent maintenance and maintenance costs increase, inconveniences caused by traffic interruption due to maintenance and addition of social costs. Especially, asphalt pavement is being used, there is a risk of accidents due to many plastic deformation due to durability deterioration in vehicle traffic roads and intersections.

Concrete pavement is a method of packing general concrete at the top of a bridge road surface, and it is economical because it is low in material cost, and it is advantageous in that it can be installed simultaneously with the bottom plate of a bridge, Cracks are likely to occur in the concrete, and there is a problem that corrosion of the reinforcing bars can easily occur due to penetration of toxic chemicals including chlorides from the upper part due to high permeability.

The problem to be solved by the present invention is to improve the workability of concrete by adding a polymer admixture mixed with methyl methacrylate, styrene, butyl acrylate, polyethylene propylene, itaconic acid, sodium persulfate and process oil, An improvement in durability of concrete, and in particular, an improvement in bending strength, tensile strength, initial strength, long term strength, salt resistance and freezing and thawing resistance, thereby reducing defects of concrete, And a maintenance method of a concrete structure using the composition.

The present invention relates to a process for producing a quick-setting type binder, which comprises 4 to 30% by weight of a fast-spinning binder, 25 to 65% by weight of a fine aggregate, 20 to 60% by weight of a coarse aggregate, 0.1 to 15% by weight of water and 0.01 to 15% by weight of a polymer admixture, Is a binder which exhibits strength at 12 hours of age and is usually 20 to 55 wt% of Portland cement, 5 to 40 wt% of calcium or magnesium sulfoaluminate, 0.1 to 25 wt% of aluminate, 0.01 to 20 wt% of gypsum, 0.01 to 20% by weight of fly ash, 0.01 to 20% by weight of aluminum hydroxide, 0.01 to 10% by weight of aluminum hydroxide and 0.01 to 10% by weight of barium sulfate, wherein the polymer admixture comprises 50 to 99% by weight of methyl methacrylate, By weight of propylene glycol, 0.1 to 15% by weight of butyl acrylate, 0.01 to 10% by weight of polyethylene propylene, 0.01 to 10% by weight of itaconic acid, 0.01 to 10% by weight of sodium persulfate and 0.01 to 10% Characterized in that the grained steel polymer cement concrete composition Provided.

The polymer admixture may further comprise 0.01 to 10% by weight of acrylonitrile.

The polymer admixture may further include 0.01 to 10% by weight of styrene-butadiene.

The polymer admixture may further include 0.01 to 10% by weight of polyphenylene.

In addition, the polymer admixture may further contain 0.01 to 10% by weight of an antifoaming agent.

The polymer admixture may further comprise 0.01 to 10% by weight of air entraining agent.

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The quick-hardening binder may further comprise 0.01 to 10% by weight of at least one material selected from meta kaolin and silica fume.

In addition, the fast-type binding material may further contain 0.001 to 5% by weight of at least one material selected from polyvinyl alcohol, polyethylene propylene, methylcellulose, starch and gum.

The quick-hardening type binder may further contain 0.001 to 5% by weight of at least one material selected from the group consisting of lithium sulfate, calcium salt, chloride, sulfate, potassium hydroxide, sodium hydroxide, carbonate, formic acid or its salt and lithium carbonate.

In addition, the quick-hardening binder may further contain 0.01 to 5% by weight of a water reducing agent.

In addition, the fast-cycling type binder may further include 0.01 to 10% by weight of a retarder.

In addition, the present invention provides a method for producing a coagulant, comprising the steps of: mixing 4 to 30 wt% of a fast-spinning binder, 25 to 65 wt% of a fine aggregate, and 20 to 60 wt% of a coarse aggregate into a mixer, Wherein the quick-setting binder comprises 20 to 55% by weight of Portland cement, 5 to 40% by weight of calcium or magnesium sulfoaluminate, 0.1 to 25% by weight of aluminate 0.01 to 20% by weight of gypsum, 0.01 to 20% by weight of blast furnace slag, 0.01 to 20% by weight of fly ash, 0.01 to 10% by weight of aluminum hydroxide and 0.01 to 10% by weight of barium sulphate, By weight of styrene, 0.1 to 15% by weight of butyl acrylate, 0.01 to 10% by weight of polyethylene propylene, 0.01 to 10% by weight of itaconic acid, 0.01 to 10% by weight of sodium persulfate, 0.01 to 10% by weight of process oil It provides a rasp steel production method of the polymer cement concrete composition to.

According to another aspect of the present invention, there is provided a method of manufacturing a concrete structure, comprising the steps of: removing impurities or deteriorated portions by chipping a site where a concrete structure is deteriorated or an impurity is attached using a crusher or a water jet; applying a primer to a site where the concrete is deteriorated; , Restoring a section of the area degraded by the cementitious-grained polymer cement concrete composition, and applying a curing agent on the cementitious reinforced polymer cement concrete composition, wherein the primer is a styrene-butadiene rubber latex, a poly Acrylic ester, acrylic and ethylene vinyl acetate, and the polymer admixture. The present invention also provides a maintenance method for a concrete structure.

According to the present invention, a polymer admixture comprising a mixture of methyl methacrylate, styrene, butyl acrylate, polyethylene propylene, itaconic acid, sodium persulfate, and process oil and a quick- And improve the durability of the concrete. In particular, the defects of concrete can be reduced by improving the bending strength, tensile strength, initial strength, long-term strength, salt resistance and freeze-thaw resistance. In particular, the use of a quick-setting type binder improves initial strength and long-term strength, durability, flame retardancy, freeze-thaw resistance and the like.

Hereinafter, preferred embodiments according to the present invention will be described in detail. However, it should be understood that the following embodiments are provided so that those skilled in the art will be able to fully understand the present invention, and that various modifications may be made without departing from the scope of the present invention. It is not.

The concrete of the present invention is characterized in that it comprises 4 to 30% by weight of a quick-setting binder, 25 to 65% by weight of a fine aggregate, 20 to 60% by weight of a coarse aggregate, 0.1 to 15% 15% by weight.

Aggregates are classified into fine aggregate and coarse aggregate. In the following, the aggregate having a particle diameter of 5 mm or less is referred to as a fine aggregate and the aggregate having a particle diameter larger than 5 mm is classified as a coarse aggregate. The fine aggregate is preferably contained in the anchor steel polymer cement concrete composition in an amount of 25 to 65 wt%, and the coarse aggregate is preferably contained in the anchor steel polymer cement concrete composition in an amount of 20 to 60 wt%.

The fast-type binder is usually composed of 20 to 55 wt% of Portland cement, 5 to 40 wt% of calcium or magnesium sulfoaluminate, 0.1 to 25 wt% of aluminate, 0.01 to 20 wt% of gypsum, 0.01 to 20 wt% of blast furnace slag, 0.01 to 20% by weight of ash, 0.01 to 10% by weight of aluminum hydroxide and 0.01 to 10% by weight of barium sulfate. The quick-hardening binder may further comprise 0.01 to 10% by weight of at least one material selected from meta kaolin and silica fume. In addition, the fast-type binding material may further contain 0.001 to 5% by weight of at least one material selected from polyvinyl alcohol, polyethylene propylene, methylcellulose, starch and gum. The quick-hardening type binder may further contain 0.001 to 5% by weight of at least one material selected from the group consisting of lithium sulfate, calcium salt, chloride, sulfate, potassium hydroxide, sodium hydroxide, carbonate, formic acid or its salt and lithium carbonate. In addition, the quick-hardening binder may further contain 0.01 to 5% by weight of a water reducing agent. In addition, the fast-cycling type binder may further include 0.01 to 10% by weight of a retarder.

It is preferable to use the ordinary Portland cement specified in KS.

It is preferable that the weight ratio of the aluminate, calcium or magnesium sulfoaluminate increases and the calcium or magnesium sulfoaluminate is contained in the fast-setting filler in an amount of 5 to 40% by weight, And 0.1 to 25% by weight in the fast-spinning binder. When the sum of the contents of aluminate and calcium sulfoaluminate is less than 5.1% by weight, the concrete strength and the effect of suppressing the occurrence of cracks may be insignificant. When the content exceeds 65% by weight, the early strength development is excellent, And the production cost is high, which is not economical.

The gypsum is used for initial strength development. The gypsum can be anhydrous gypsum or anthracite. The gypsum is preferably contained in the quick-setting type binder in an amount of 0.01 to 20% by weight. When the content of the gypsum is increased, the fast curing property is exhibited. When the content of the gypsum is less than 0.01% by weight, the effect of improving the initial strength of the cementitious polymer cement concrete composition may be insufficient. Good physical properties can be obtained, but workability and durability may be deteriorated.

The blast furnace slag and fly ash are used for potential hydraulic properties, long-term strength development and durability enhancement. It is preferable that the blast furnace slag is contained in 0.01 to 20% by weight of the fast-burning binder. It is preferable that the fly ash is contained in 0.01 to 20% by weight of the fast-type binder.

The aluminum hydroxide is used for initial strength development and shrinkage prevention. It is preferable that the aluminum hydroxide is contained in the quick-hardening binder in an amount of 0.01 to 10% by weight. If the content of aluminum hydroxide is less than 0.01% by weight, initial strength development and shrinkage-preventing effect may be insufficient. If the content of aluminum hydroxide exceeds 10% by weight, curing may be accelerated and workability may be deteriorated.

The barium sulphate is used to prevent material separation. It is preferable that the barium sulfate is contained in the fast-slow-binding material in an amount of 0.01 to 10% by weight. If the content of barium sulfate exceeds 10% by weight, viscosity increases and workability decreases. If the content of barium sulfate is less than 0.01% by weight, workability is improved but material separation is likely to occur.

The quick-hard binder may further comprise 0.01 to 10% by weight of at least one material selected from meta kaolin and silica fume to improve latent hydraulic characteristics, long-term strength development and durability.

In addition, the fast-type binding material may further include at least one substance selected from polyvinyl alcohol, polyethylene propylene, methylcellulose, starch and gum. At least one material selected from the group consisting of polyvinyl alcohol, polyethylene propylene, methylcellulose, starch and gum is used as a material separation preventing agent in order to prevent material separation of the fast-light type binder and to improve workability. Polyvinyl alcohol, polyacrylamide, methylcellulose, starch, gum and the like as the material separation preventing agent, but it is more preferable to use a starch-type material separation preventing agent with little decrease in strength. It is preferable that at least one material selected from the group consisting of polyvinyl alcohol, polyethylene propylene, methylcellulose, starch and gum is contained in 0.001 to 5% by weight of the fast-hardening binder.

In addition, the fast-type binding material may further include at least one material selected from the group consisting of lithium sulfate, calcium salt, chloride, sulfate, potassium hydroxide, sodium hydroxide, carbonate, formic acid or salt thereof and lithium carbonate. At least one substance selected from the group consisting of lithium sulfate, calcium salt, chloride, sulfate, potassium hydroxide, sodium hydroxide, carbonate, formic acid or its salt and lithium carbonate acts as an accelerator and has a very rapid reaction rate in contact with water, It is possible to obtain the compressive strength obtained within several days within a few hours. As the accelerator, there can be used calcium formate, calcium chloride, calcium salt such as calcium nitrate, chloride such as magnesium chloride, lithium sulfate, sulfate, potassium hydroxide, sodium hydroxide, carbonate, formic acid or its salt, lithium carbonate, There is a problem that the solubility is low and the early strength development time is delayed, and lithium sulfate is particularly preferable because there is almost no such problem. Lithium sulfate has a solubility more than 300 times that of other accelerators, which has the advantage of shortening the time of early strength expression. It is preferable that at least one material selected from the group consisting of lithium sulfate, calcium salt, chloride, sulfate, potassium hydroxide, sodium hydroxide, carbonate, formic acid or its salt and lithium carbonate is contained in 0.001 to 5 wt.

The water reducing agent is used for improving the strength and durability. Examples of the water reducing agent include naphthalene-based, melamine-based, polycarboxylic acid-based water reducing agents and the like, but it is more preferable to use a polycarboxylic acid based water reducing agent. The water reducing agent is preferably contained in the fast-slow-binding material in an amount of 0.01 to 5% by weight.

The fast curing type binder may further include a retarding agent. The retarding agent may be used for delaying rapid curing by gypsum in order to ensure workability for a predetermined period of time. By weight. As the delaying agent, generally well known substances can be used. Examples thereof include saccharides such as glucose, glucose, texturin and dextran, acids or salts thereof such as gluconic acid, malic acid, citric acid and citric acid, Or a salt thereof, a phosphonic acid or a derivative thereof, and a polyhydric alcohol such as glycerin.

The polymer admixture is used to improve the workability, concrete strength and durability of the cementitious hard polymer cement concrete composition. The polymer admixture comprises 50 to 99% by weight of methyl methacrylate, 0.1 to 15% by weight of styrene, 0.1 to 15% by weight of butyl acrylate 0.01 to 10% by weight of polyethylene propylene, 0.01 to 10% by weight of itaconic acid, 0.01 to 10% by weight of sodium persulfate and 0.01 to 3% by weight of process oil. The polymer admixture may further comprise 0.01 to 10% by weight of acrylonitrile. The polymer admixture may further include 0.01 to 10% by weight of styrene-butadiene. The polymer admixture may further include 0.01 to 10% by weight of polyphenylene. In addition, the polymer admixture may further contain 0.01 to 10% by weight of an antifoaming agent. The polymer admixture may further comprise 0.01 to 10% by weight of air entraining agent.

The methyl methacrylate is used to improve the strength and durability of the composition. The methyl methacrylate is preferably contained in the polymer admixture in an amount of 50 to 99% by weight. If the content of methyl methacrylate is less than 50 wt%, the effect of improving strength and durability may be deteriorated. If the content of methyl methacrylate exceeds 99 wt%, the effect of improving strength and durability is excellent but not economical.

The styrene is used to improve the adhesive strength and flexural toughness of the composition. The styrene is preferably contained in the polymer admixture in an amount of 0.1 to 15% by weight. If the content of styrene exceeds 15% by weight, the adhesive strength and flexural toughness of the prepreg steel polymer cement concrete composition are improved but the viscosity is lowered to cause material separation. If the styrene content is less than 0.1% by weight, the flexural strength of the cement concrete composition The effect of improving toughness and adhesion may be weak.

The butyl acrylate is used for improving the dispersibility and the water resistance. The butyl acrylate is preferably contained in the polymer admixture in an amount of 0.1 to 15% by weight. If the content of butyl acrylate exceeds 15% by weight, the dispersibility and water resistance of the cementitious-grained polymer cement concrete composition are improved but the viscosity is lowered and the material separation is likely to occur and the price competitiveness may be deteriorated. If the butyl acrylate content If it is less than 0.01% by weight, the effect of improving the dispersibility and water resistance may be insignificant.

The polymer admixture uses polyethylene propylene to improve adhesion and adhesion strength. The polyethylene propylene is preferably contained in the polymer admixture in an amount of 0.01 to 10% by weight. If the content of the polyethylene propylene exceeds 10% by weight, the adhesive strength is improved but the viscosity is increased and the workability is lowered. If the content of the polyethylene propylene is less than 0.01%, the effect of improving the bonding strength may be weak.

The itaconic acid is used for controlling the dispersion stability, mixing property and air amount of the polymer admixture. The itaconic acid is preferably contained in the polymer admixture in an amount of 0.01 to 10% by weight. If the content of itaconic acid is more than 20% by weight, the dispersion stability and the mixing property may be improved but the price competitiveness may be deteriorated. If the content of itaconic acid is less than 0.1% by weight, .

The sodium persulfate is used as a reaction initiator of the polymer admixture. The sodium persulfate is preferably contained in the polymer admixture in an amount of 0.01 to 10% by weight. If the content of sodium persulfate exceeds 10% by weight, the reaction rate is increased and the workability is lowered. If the content of sodium persulfate is less than 0.01% by weight, the reaction rate is lowered and the initial strength development is deteriorated.

In addition, the polymer admixture may include a process oil to improve dispersibility. The process oil is preferably contained in the polymer admixture in an amount of 0.01 to 10% by weight. If the content of the process oil exceeds 10% by weight, workability is likely to occur but material separation is likely to occur. If the content of the process oil is less than 0.01% by weight, dispersibility is lowered and workability is lowered.

The acrylonitrile is used for improving durability. The acrylonitrile is preferably contained in the polymer admixture in an amount of 0.01 to 10% by weight. If the content of the acrylonitrile exceeds 10% by weight, the durability of the prepreg steel polymer cement concrete composition may be improved, but the price competitiveness may be deteriorated and the hydrodynamic deterioration may be deteriorated. If the content of the acrylonitrile is less than 0.01% The effect of improving the durability of the cement concrete composition may be weak.

The styrene-butadiene is used to improve strength and durability. The styrene-butadiene is preferably contained in the polymer admixture in an amount of 0.01 to 10% by weight. If the content of styrene-butadiene exceeds 10% by weight, the strength and durability are improved, but the viscosity is increased and the workability is lowered. If the content of styrene-butadiene is less than 0.01% by weight, the effect of improving the strength and durability may be weak .

The polyphenylene is used for improving heat resistance and durability. The polyphenylene is preferably contained in the polymer admixture in an amount of 0.01 to 10% by weight. If the content of the polyphenylene exceeds 10% by weight, the heat resistance and durability are improved but the viscosity is increased and the workability is deteriorated. If the content of the polyphenylene is less than 0.01% by weight, the effect of improving the heat resistance and durability may be weak .

The defoaming agent is used to remove the pores in the concrete to increase the strength and durability of the concrete, and it is preferable to add 0.01 to 10% by weight to the polymer admixture. As the antifoaming agent, generally known substances such as an alcohol antifoaming agent, a silicone antifoaming agent, a fatty acid antifoaming agent, an oil antifoaming agent, an ester antifoaming agent and an oxyalkylene antifoaming agent can be used. Examples of the silicone defoaming agent include dimethyl silicone oil, polyorganosiloxane, and fluorosilicone oil. Examples of the fatty acid defoaming agent include stearic acid and oleic acid. Examples of the oil-based antifoaming agent include kerosene, animal and plant oil, castor oil, and the ester-based antifoaming agents include solitol trioleate and glycerol monoricinolate. Examples of the oxyalkylene antifoaming agents include polyoxyalkylene, acetylene ethers, polyoxyalkylene diazoxide esters, polyoxyalkylene alkylamines, and the like. Examples of the antifoaming agent include glycol.

The air entraining agent is used to improve workability by improving the dispersibility of the grained steel polymer cement concrete composition. The air entraining agent may be a polycarboxylic acid type, a naphthalene type, a melamine type or the like, but it is preferable to use a polycarboxylic acid type air entraining agent. The air entraining agent is preferably contained in the polymer admixture in an amount of 0.01 to 10% by weight.

The method for producing an aged steel polymer cement concrete composition according to a preferred embodiment of the present invention comprises mixing 4 to 30 wt% of a fast-spinning binder, 25 to 65 wt% of a fine aggregate, and 20 to 60 wt% of a coarse aggregate in a mixer, And mixing and stirring 0.1 to 15% by weight of water and 0.01 to 15% by weight of a polymer admixture to the stirred and resultant product, wherein the quick-setting binder is usually 20 to 55% by weight of a portland cement, calcium or magnesium sulfoaluminate A mixture of 5 to 40 wt% of nitrate, 0.1 to 25 wt% of aluminate, 0.01 to 20 wt% of gypsum, 0.01 to 20 wt% of blast furnace slag, 0.01 to 20 wt% of fly ash, 0.01 to 10 wt% Wherein the polymer admixture comprises 50 to 99 wt% of methyl methacrylate, 0.1 to 15 wt% of styrene, 0.1 to 15 wt% of butyl acrylate, 0.01 to 10 wt% of polyethylene propylene, 0.01 to 10 wt% of itaconic acid, 10% by weight, And a sulfate of 0.01 to 10% by weight of process oil and 0.01 to 10% by weight.

According to a preferred embodiment of the present invention, there is provided a method of maintaining and repairing a concrete structure, the method comprising the steps of: removing impurities or deteriorated portions by chipping a portion of a concrete structure deteriorated or impurities with a crusher or a water jet; A step of applying a primer to the deteriorated part, a step of recovering a section of the part deteriorated by the cementitious-grained polymer cement concrete composition, and a step of applying a curing agent on the cemented reinforced polymer cement concrete composition .

Hereinafter, the term "concrete structure" is used to mean any structure made of concrete, such as a road surface, a bridge bridge, a concrete slab of a bridge, and a bridge bottom.

The primer may be selected from the group consisting of styrene butadiene rubber latex, polyacrylic ester (PAE), acryl and ethylene vinyl acetate (PET), which facilitate the attachment of the cementitious polymer cement concrete composition to a concrete structure. EVA), and the polymer admixture. At this time, the solid content of the primer is preferably lowered to about 13% by weight. When it is used in an amount exceeding 13% by weight, the film thickness becomes thick, and adhesion performance may be deteriorated.

The curing agent may be a generally known material.

Hereinafter, embodiments of the pultrusion steel polymer cement concrete composition according to the present invention will be more specifically shown, and the present invention is not limited by the following embodiments.

17 wt% of a fast-melting binder, 43 wt% of a fine aggregate, and 35 wt% of a coarse aggregate were charged into a mixer, and the mixture was forcedly stirred. Then, 2 wt% of water and 3 wt% of a polymer admixture were further mixed, A concrete composition was prepared.

At this time, the fast-type binding material is composed of 40 wt% of ordinary Portland cement, 30 wt% of calcium or magnesium sulfoaluminate, 10 wt% of aluminate, 6 wt% of gypsum, 5 wt% of blast furnace slag, 5 wt% of fly ash, % By weight of barium sulfate, 0.5% by weight of a water reducing agent, 0.5% by weight of an anti-segregation agent, 0.5% by weight of an accelerator and 0.5% by weight of a retarder. A polycarboxylic acid-based water reducing agent was used as the water reducing agent, starch-based material separation preventing agent was used as the material separation preventing agent, lithium sulfate was used as the accelerator, and citric acid was used as the delaying agent.

The polymer admixture was prepared by mixing 90 wt% of methyl methacrylate, 1 wt% of styrene, 1 wt% of butyl acrylate, 1 wt% of polyethylene propylene, 1 wt% of itaconic acid, 1 wt% of sodium persulfate, 1% by weight of acrylonitrile, 1% by weight of styrene-butadiene, 1% by weight of polyphenylene, 0.5% by weight of an antifoaming agent and 0.5% by weight of air entraining agent. The antifoaming agent was a silicone antifoaming agent and the air entraining agent was a polycarboxylic acid air entraining agent.

17 wt% of a fast-melting binder, 43 wt% of a fine aggregate, and 35 wt% of a coarse aggregate were charged into a mixer, and the mixture was forcedly stirred. Then, 2 wt% of water and 3 wt% of a polymer admixture were further mixed, A concrete composition was prepared.

At this time, the fast-type binding material is composed of 40 wt% of ordinary Portland cement, 30 wt% of calcium or magnesium sulfoaluminate, 10 wt% of aluminate, 6 wt% of gypsum, 5 wt% of blast furnace slag, 5 wt% of fly ash, % By weight of barium sulfate, 0.5% by weight of a water reducing agent, 0.5% by weight of an anti-segregation agent, 0.5% by weight of an accelerator and 0.5% by weight of a retarder. A polycarboxylic acid-based water reducing agent was used as the water reducing agent, starch-based material separation preventing agent was used as the material separation preventing agent, lithium sulfate was used as the accelerator, and citric acid was used as the delaying agent.

The polymer admixture was composed of 85 wt% of methyl methacrylate, 2 wt% of styrene, 2 wt% of butyl acrylate, 2 wt% of polyethylene propylene, 2 wt% of itaconic acid, 2 wt% of sodium persulfate, 1% by weight of acrylonitrile, 1% by weight of styrene-butadiene, 1% by weight of polyphenylene, 0.5% by weight of an antifoaming agent and 0.5% by weight of air entraining agent. The antifoaming agent was a silicone antifoaming agent and the air entraining agent was a polycarboxylic acid air entraining agent.

17 wt% of a fast-melting binder, 43 wt% of a fine aggregate, and 35 wt% of a coarse aggregate were charged into a mixer, and the mixture was forcedly stirred. Then, 2 wt% of water and 3 wt% of a polymer admixture were further mixed, A concrete composition was prepared.

At this time, the fast-type binding material is composed of 40 wt% of ordinary Portland cement, 30 wt% of calcium or magnesium sulfoaluminate, 10 wt% of aluminate, 6 wt% of gypsum, 5 wt% of blast furnace slag, 5 wt% of fly ash, % By weight of barium sulfate, 0.5% by weight of a water reducing agent, 0.5% by weight of an anti-segregation agent, 0.5% by weight of an accelerator and 0.5% by weight of a retarder. A polycarboxylic acid-based water reducing agent was used as the water reducing agent, starch-based material separation preventing agent was used as the material separation preventing agent, lithium sulfate was used as the accelerator, and citric acid was used as the delaying agent.

The polymer admixture was composed of 80 wt% of methyl methacrylate, 3 wt% of styrene, 3 wt% of butyl acrylate, 3 wt% of polyethylene propylene, 3 wt% of itaconic acid, 3 wt% of sodium persulfate, 1% by weight of acrylonitrile, 1% by weight of styrene-butadiene, 1% by weight of polyphenylene, 0.5% by weight of an antifoaming agent and 0.5% by weight of air entraining agent. The antifoaming agent was a silicone antifoaming agent and the air entraining agent was a polycarboxylic acid air entraining agent.

Comparative Example 1 and Comparative Example 2 are presented so that the characteristics of Examples 1 to 3 can be grasped more easily. Comparative Examples 1 to 2 show ordinary Portland cement concrete composition and acrylic modified cement concrete composition It is.

[Comparative Example 1]

17% by weight of Portland cement, 43% by weight of fine aggregate, 35% by weight of coarse aggregate and 5% by weight of water were added to a mixer and forced stirring to prepare a usual Portland cement concrete composition.

[Comparative Example 2]

17% by weight of Portland cement, 43% by weight of fine aggregate, and 35% by weight of coarse aggregate were added to a mixer and forced stirring. Then, 2% by weight of water and 3% by weight of methyl methacrylate were further mixed, A concrete composition was prepared.

The following test examples show experimental results comparing characteristics of the embodiments of the present invention with those of Comparative Examples 1 to 2 so as to more easily grasp the characteristics of Embodiments 1 to 3 according to the present invention .

[Test Example 1]

The slurry test (the degree of kneading) was carried out according to the method specified in KS F 2402 for the cementitious concrete composition prepared according to Examples 1 to 3 and Comparative Examples 1 to 2 . The slump test is to test the quality of the dough such as the flue and viscosity of the concrete. The larger the value, the better the workability in putting the concrete.

Table 1 below shows the change in slump over time.

division Slump (cm) Immediately after stirring After 20 minutes After 30 minutes After 40 minutes After 60 minutes Example 1 20 17 12 10 9 Example 2 19 17 13 12 10 Example 3 20 18 15 14 10 Comparative Example 1 14 10 7 5 3 Comparative Example 2 18 14 10 8 4

As shown in Table 1 above, the prepreg steel polymer cement concrete compositions prepared according to Examples 1 to 3 were superior to the cement concrete compositions prepared according to Comparative Examples 1 to 2.

[Test Example 2]

The results are shown in the results of compressive strength test according to the method of KS F 2405 according to the concrete compositions prepared according to Examples 1 to 3 and Comparative Examples 1 to 2 .

Table 2 below shows the change in compressive strength with time.

division Compressive strength (kgf /) After 12 hours After 24 hours 3 days later After 7 days After 28 days Example 1 268 335 345 369 438 Example 2 278 348 355 370 445 Example 3 279 351 360 379 451 Comparative Example 1 - - - 206 387 Comparative Example 2 - - - 214 406

As shown in the above Table 2, since the cementitious steel polymer cement concrete composition prepared according to Examples 1 to 3 hardens after 3 hours after the application, it is possible to perform other operations in the concrete placed thereon, The cement concrete composition prepared according to Example 1 and Comparative Example 2 can not be cured even after a lapse of one day and can not perform any other work at all. Also, even after fully cured, the extruded steel polymer cement concrete composition prepared according to Examples 1 to 3 had significantly higher compressive strength than the cement concrete compositions prepared according to Comparative Examples 1 to 2. [

[Test Example 3]

The results are shown in Table 1. The results are shown in Table 1. The results are shown in Table 1. The results are shown in Tables 1 and 2.

Table 3 below shows the changes in bending strength with time.

division Bending strength (kgf /) After 12 hours After 24 hours 3 days later After 7 days After 28 days Example 1 57 61 65 70 80 Example 2 59 64 68 75 86 Example 3 62 69 72 78 88 Comparative Example 1 - - - 32 55 Comparative Example 2 - - - 56 76

As shown in Table 3, the prepreg steel polymer cement concrete compositions prepared according to Examples 1 to 3 had significantly higher bending strength than the cement concrete compositions prepared according to Comparative Examples 1 to 2. [

[Test Example 4]

The adhesive strength of the cement concrete composition prepared according to Examples 1 to 3 and Comparative Examples 1 to 3 was measured according to KS F 2762, The results are shown in Table 4.

division Adhesive strength (kgf /) After 12 hours After 24 hours After 3 hours After 7 days After 28 days Example 1 16 18 19 22 23 Example 2 17 19 21 23 24 Example 3 18 20 23 25 26 Comparative Example 1 - - - 12 18 Comparative Example 2 - - - 15 22

As shown in Table 4 above, the ultrahigh strength steel polymer cement concrete composition prepared according to Examples 1 to 3 had significantly higher bonding strength than the cement concrete compositions prepared according to Comparative Examples 1 to 2.

[Test Example 5]

The results of measurement of the water absorption rate according to the method in which the cementitious steel polymer cement concrete composition prepared according to Examples 1 to 3 and the concrete composition prepared according to Comparative Examples 1 to 2 were specified in KS F 4004 (cement brick) . If the water absorption rate is high, if the impurities or water penetrate into the concrete, the porosity increases in the interior of the concrete, thereby causing a problem of causing damage to the structure. That is, the lower the absorptivity, the more the strength of the concrete is improved after curing.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Absorption rate
(%) 0.5 0.4 0.3 2.8 1.1

As shown in Table 5 above, the water-hardened polymer cement concrete composition prepared according to Examples 1 to 3 had a lower water absorption rate than the cement concrete compositions prepared according to Comparative Examples 1 to 2. [

[Test Example 6]

The results of the freeze-thaw resistance test according to the method specified in KS F 2456 are shown in the results of the frost-thaw resistance test of the cementitious-strength polymer cement concrete composition prepared according to Examples 1 to 3 and the concrete composition prepared according to Comparative Examples 1 to 2 will be. Freezing and thawing means that the water absorbed in the concrete is frozen and melted. When freezing and thawing is repeated, fine cracks are generated in the concrete structure, and the durability is lowered.

Table 6 shows the durability indices of the respective examples and comparative examples according to the freeze-thaw resistance test.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Durability index 92 93 93 59 88

As shown in Table 6 above, since the durability index of the cement concrete composition prepared according to Examples 1 to 3 is higher than that of the cement concrete compositions prepared according to Comparative Examples 1 to 2, Is improved.

[Test Example 7]

The shrinkage percentage of the concrete prepared from the prepregulated steel polymer cement concrete compositions prepared according to Examples 1 to 3 and the concrete compositions prepared according to Comparative Examples 1 to 2 was measured by KS F 2424 (length change test method for concrete) The results are shown in Table 7 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Dry shrinkage
(%) 0.04 0.03 0.01 0.12 0.09

As shown in Table 7 above, the cement concrete composition of the present invention produced according to Examples 1 to 3 had reduced shrinkage of shrinkage compared with the cement concrete compositions prepared according to Comparative Examples 1 to 2, .

[Test Example 8]

The test specimens of the prepreg steel polymer cement concrete compositions prepared according to Examples 1 to 3 and the concrete compositions prepared according to Comparative Examples 1 to 2 were tested in accordance with JIS A 1171 (Test Method for Polymer Cement Mortar) The results are shown in Table 8.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Neutralization depth (mm) 0.5 0.3 0.2 1.5 0.9

As shown in Table 8, the cement concrete compositions of Examples 1 to 3 had a lower neutralization penetration depth than the cement concrete compositions prepared according to Comparative Examples 1 to 2, And the resistance was high.

[Test Example 9]

The results are shown in Table 9. The results are shown in Table 9 below. The results are shown in Table 9 below. ≪ tb > < TABLE > Id = Table 9 Columns = 3 < tb > .

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Chloride ion
Penetration depth (mm) 1.2 1.0 0.8 3.1 1.8

As shown in Table 9 above, the steel-reinforced polymer cement concrete composition prepared according to Examples 1 to 3 had a lower chloride ion penetration depth than the cement concrete compositions prepared according to Comparative Examples 1 to 2, And that the resistance to

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, This is possible.

Claims (14)

Wherein the polymeric binder comprises 4 to 30% by weight of a quick-setting binder, 25 to 65% by weight of a fine aggregate, 20 to 60% by weight of a coarse aggregate, 0.1 to 15% by weight of water and 0.01 to 15%
The quick-hard binder is a binder which exhibits strength at 12 hours of age. The binder is usually 20 to 55% by weight of Portland cement, 5 to 40% by weight of calcium or magnesium sulfoaluminate, 0.1 to 25% by weight of aluminate, 0.01 to 20% 0.01 to 20% by weight of blast furnace slag, 0.01 to 20% by weight of fly ash, 0.01 to 10% by weight of aluminum hydroxide and 0.01 to 10% by weight of barium sulfate,
Wherein the polymer admixture comprises 50 to 99 wt% of methyl methacrylate, 0.1 to 25 wt% of styrene, 0.1 to 15 wt% of butyl acrylate, 0.01 to 10 wt% of polyethylene propylene, 0.01 to 10 wt% of itaconic acid, 0.01 to 10% by weight of a process oil and 0.01 to 10% by weight of a process oil. [3] The composition of claim 1, wherein the polymer admixture further comprises 0.01 to 10% by weight of acrylonitrile. [3] The composition of claim 1, wherein the polymer admixture further comprises 0.01 to 10% by weight of styrene-butadiene. [3] The composition of claim 1, wherein the polymer admixture further comprises 0.01 to 10% by weight of polyphenylene. [3] The composition of claim 1, wherein the polymer admixture further comprises 0.01 to 10% by weight of an antifoaming agent. [3] The composition of claim 1, wherein the polymer admixture further comprises 0.01 to 10% by weight of air entraining agent. delete [3] The composition of claim 1, wherein the quick-melting type binder further comprises 0.01 to 10% by weight of at least one material selected from meta kaolin and silica fume. [3] The method of claim 1, wherein the fast-type binding material further comprises 0.001 to 5% by weight of at least one substance selected from the group consisting of polyvinyl alcohol, polyethylene propylene, methylcellulose, starch and gum. Steel polymer cement concrete composition. The method of claim 1, wherein the fast-type binder further comprises 0.001 to 5% by weight of at least one material selected from lithium sulfate, calcium salt, chloride, sulfate, potassium hydroxide, sodium hydroxide, carbonate, formic acid or salt thereof and lithium carbonate By weight based on the total weight of the cement composition. [3] The composition of claim 1, wherein the quick-melting type binder further comprises 0.01 to 5% by weight of a water reducing agent. [3] The composition of claim 1, wherein the quick-setting binder further comprises 0.01 to 10% by weight of a retarder. 4 to 30% by weight of a quick-setting binder, 25 to 65% by weight of a fine aggregate, and 20 to 60% by weight of a coarse aggregate are added to a mixer and the mixture is forcedly agitated. To the resultant mixture, 0.1 to 15% by weight of water and 0.01 to 15% % ≪ / RTI > and further stirring,
The fast-type binder is usually composed of 20 to 55 wt% of Portland cement, 5 to 40 wt% of calcium or magnesium sulfoaluminate, 0.1 to 25 wt% of aluminate, 0.01 to 20 wt% of gypsum, 0.01 to 20 wt% of blast furnace slag, Wherein the polymer admixture comprises from 50 to 99% by weight of methyl methacrylate, from 0.1 to 15% by weight of styrene, from 0.01 to 10% by weight of aluminum hydroxide, from 0.01 to 20% by weight of ash, from 0.01 to 10% Characterized in that it comprises 0.1 to 15% by weight of polyethylene terephthalate, 0.01 to 10% by weight of polyethylene propylene, 0.01 to 10% by weight of itaconic acid, 0.01 to 10% by weight of sodium persulfate and 0.01 to 10% A method for producing a concrete composition. Removing impurities or deteriorated portions by chipping a site where a concrete structure is deteriorated or an impurity is attached using a crusher or a water jet;
Applying a primer to a site where the concrete has deteriorated,
A method for manufacturing a cementitious hardened polymer cement concrete composition, comprising the steps of: recovering a section of a part degraded by the cemented anchor steel polymer cement concrete composition according to claim 1; and applying a curing agent on the cemented anchor steel cement concrete composition,
Wherein the primer is at least one material selected from styrene-butadiene rubber latex, polyacrylic ester, acrylic and ethylene vinyl acetate, and the polymer admixture.