KR101498502B1 - Cement concrete composition for revealing high early strength comprising the polymer and repairing method of concrete structure using the composition - Google Patents

Abstract

The present invention relates to a polymer-mixed cement concrete composition for revealing high early strength containing 5 to 35 wt% of high early strength cement-based binding material, 20 to 70 wt% of fine aggregate, 20 to 70 wt% of coarse aggregate, 0.1 to 20 wt% of water, and 0.01 to 20 wt% of synthetic polymer-based mixer, in which the synthetic polymer-based mixer contains 1 to 97 wt% of unsaturated aromatic monomer, 1 to 97 wt% of acrylic monomer, 1 to 97 wt% of aliphatic conjugate monomer, and 0.1 to 20 wt% of unsaturated carboxylic acid monomer, and a repairing method for a concrete structure using the same. According to the present invention, concrete operability and concrete durability are improved since the cement concrete composition contains the synthetic polymer-based mixer in which the unsaturated aromatic monomer, acrylic monomer, aliphatic conjugate monomer and unsaturated carboxylic acid monomer are mixed and the high early strength cement-based binding material. In addition, concrete defects can be reduced based on the improvement of flexural strength, tensile strength, initial strength, long-term strength, chloride resistance, freezing and thawing resistance, and the like.

Description

Technical Field [0001] The present invention relates to a polymer-reinforced cement concrete composition and a method for maintaining and repairing a concrete structure using the same,

The present invention relates to a cement concrete composition and a maintenance method for the concrete structure using the cement concrete composition. More particularly, the present invention relates to a polymer-incorporated toughening cement concrete composition for use in road surface packaging, bridge bridge pavement, And a maintenance method of a concrete structure using the same.

When the concrete is cracked due to deterioration in the concrete structure, especially the concrete slab of the bridge, the road surface and the lower part of the bridge, the compressive strength of the concrete gradually decreases and the tensile strength of the reinforcing bar gradually decreases. Concrete becomes neutralized and corrosion of steel bars occurs. If these rebar corrosion phenomena become severe, the concrete structure may eventually collapse. Therefore, if the concrete structure deteriorates and cracks are generated, it is necessary to repair the deteriorated part quickly.

On the other hand, the concrete pavement has a stiffness, it has a large construction restriction on the temperature and the surrounding environment, takes a long period of curing, has a disadvantage of cracking due to drying shrinkage, unfavorable riding comfort and comfort, And some of them are applied to highway and medium-sized roads. In recent emergency repair work, polymer cement concrete with polymer emulsion added to concrete has been increasingly used to overcome the disadvantages of crude steel portland cement.

Generally, there is a disadvantage in that when the concrete structure is manufactured or packed, cracks due to drying shrinkage occur, and the surface of the concrete structure is subjected to levitation due to bleeding, resulting in weak surface strength and durability.

Korean Patent Registration No. 10-0615826

The problem to be solved by the present invention is to improve the workability of concrete by adding a synthetic polymer-based admixture and an aerated cementitious binder mixed with an unsaturated aromatic monomer, an acrylic monomer, an aliphatic conjugated monomer and an unsaturated carboxylic acid monomer, The present invention relates to a polymer-incorporated cementitious cement concrete composition which improves durability and reduces defects of concrete by improving bending strength, tensile strength, initial strength, long-term strength, flame retardancy and freeze-thaw resistance, and a maintenance method of concrete structures using the same .

The present invention relates to a polymer-incorporated rigid cement concrete composition comprising 5 to 35% by weight of a rigid cementitious binder, 20 to 70% by weight of a fine aggregate, 20 to 70% by weight of a coarse aggregate, 0.1 to 20% Wherein the synthetic polymeric admixture comprises 1 to 97% by weight of an unsaturated aromatic monomer, 1 to 97% by weight of an acrylic monomer, 1 to 97% by weight of an aliphatic conjugated monomer, and 0.1 to 20% by weight of an unsaturated carboxylic acid monomer By weight based on the total weight of the cement composition.

The unsaturated aromatic monomer may include at least one material selected from styrene, alpha-methylstyrene, and vinyltoluene. The acrylic monomer may be at least one selected from the group consisting of methyl methacrylate, methyl acrylate, butyl acrylate, 2-hydroxyethyl acrylate And 2-ethylhexyl acrylate, and the aliphatic conjugated monomer may include at least one material selected from butadiene and isoprene, and the unsaturated carboxylic acid monomer may be at least one selected from the group consisting of maleic anhydride Fumaric acid, itaconic acid, acrylic acid, and crotonic acid. The term " acid "

The synthetic polymer based binder may further comprise 0.01 to 15% by weight of ethylene vinyl acetate (EVA).

The synthetic polymer based binder may further comprise 0.01 to 15% by weight of polyvinyl alcohol (PVOH).

The synthetic polymer based binder may further comprise 0.01 to 15% by weight of polyvinyl acetate (PVAC).

The synthetic polymer based binder may further comprise 0.01 to 15% by weight of polymethyl methacrylate.

The synthetic polymer based binder may further comprise 0.01 to 15% by weight of polyacrylonitrile.

Wherein the crude cementitious binder is a mixture of 30 to 80 wt% of Portland cement, 5 to 50 wt% of calcium alumina cement, 1 to 10 wt% of gypsum, 1 to 20 wt% of blast furnace slag, 0.1 to 10 wt% To 10% by weight of calcium silicate and 0.01 to 10% by weight of calcium silicate.

The crude hardening cement based binder may further include 0.01 to 20% by weight of at least one material selected from fly ash and silica fume.

The crude cementitious binder may further include 0.01 to 5% by weight of lithium carbonate.

According to another aspect of the present invention, there is provided a method of manufacturing a concrete slab, comprising: a step of chipping a portion where a concrete structure is deteriorated by using a shredder or a water jet to deteriorate impurities and deteriorated portions; Removing the asphalt residue and the watertight layer; cleaning the chipped portion with a vacuum suction vehicle; allowing the polymer-incorporated crude rigid cement concrete composition to adhere to the concrete structure, improve surface strength, Applying a surface layer protective material to the deteriorated portion of the concrete structure in order to suppress ion penetration and improve water resistance, restoring a cross section of the deteriorated portion by placing the polymer mixed crude cement concrete composition, Cement concrete composition And applying a curing agent to the upper portion of the concrete structure.

The surface layer protective material may include at least one selected from the group consisting of acrylic, ethylene-vinyl acetate, styrene-butadiene rubber latex, polyacrylic ester, and synthetic polymer-based materials.

According to the present invention, the synthetic polymer inclusion agent and the rigid cementitious binder which are mixed with the unsaturated aromatic monomer, the acrylic monomer, the aliphatic conjugated monomer and the unsaturated carboxylic acid monomer are contained in the cement concrete composition to improve the workability of the concrete, And can reduce defects of concrete by improving bending strength and tensile strength, initial strength, long-term strength, salt resistance and freeze-thaw resistance, among others.

The inclusion of the synthetic polymer based admixture improves the workability of the concrete, improves the durability of the concrete, and in particular has the effect of improving the flexural strength and the tensile strength.

Improved initial strength and long-term strength development, durability, flame resistance, freeze-thaw resistance and the like are obtained by containing a crude cementitious binder including Portland cement, calcium alumina cement, gypsum slag, blast furnace slag, volcanic ash powder, bentonite and calcium silicate It is effective.

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.

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 polymer-incorporated rigid cement concrete composition according to the preferred embodiment of the present invention comprises 5 to 35% by weight of a rigid cementitious binder, 20 to 70% by weight of a fine aggregate, 20 to 70% by weight of a coarse aggregate, 0.1 to 20% 0.01% to 20% by weight of the total system.

The aggregate is divided into fine aggregate and fine aggregate. 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 polymer-incorporated crude rigid cement concrete composition in an amount of 20 to 70 wt%, and the coarse aggregate is preferably contained in the polymer-incorporated precursory cement concrete composition in an amount of 20 to 70 wt%.

The above-mentioned rigid cementitious binder usually includes Portland cement, calcium alumina cement, gypsum, blast furnace slag, ash powder, bentonite and calcium silicate. Wherein the crude cementitious binder is a mixture of 30 to 80 wt% of Portland cement, 5 to 50 wt% of calcium alumina cement, 1 to 10 wt% of gypsum, 1 to 20 wt% of blast furnace slag, 0.1 to 10 wt% To 10% by weight of calcium silicate and 0.01 to 10% by weight of calcium silicate. It is preferable that such a rigid cementitious binder is contained in the polymer-incorporated rough rigid cement concrete composition in an amount of 5 to 35% by weight.

It is preferable to use the ordinary Portland cement specified in KS. The ordinary Portland cement is preferably contained in the crude cement based binder in an amount of 30 to 80% by weight.

When the weight ratio of the calcium alumina cement is increased, quick curing characteristics are exhibited. The calcium alumina cement is preferably contained in the crude cement based binder in an amount of 5 to 50% by weight. If the content of calcium alumina cement is less than 5% by weight, the effect of increasing the strength of concrete and the effect of suppressing cracking may be insignificant. If the content of calcium alumina cement is more than 50% by weight, It is not economical because of poor quality and manufacturing cost.

The gypsum plaster is used for initial strength development. When the content of gypsum gypsum is increased, it shows fast curing property. The gypsum is preferably contained in the crude tungsten-based binder in an amount of 1 to 10% by weight. When the content of the gypsum is less than 1% by weight, the effect of improving the initial strength of the polymer-incorporated rigid cement concrete composition may be insignificant. When the content of the gypsum exceeds 10% by weight, But workability and durability may be lowered.

The blast furnace slag is used for improving latent hydraulic characteristics, long-term strength development and durability. The blast furnace slag is preferably contained in the crude cement based binder in an amount of 1 to 20% by weight.

The volcanic ash powder is used for improving latent hydraulic characteristics, long-term strength development and durability. The ash powder is a silica-based pozzolan powder containing a large amount of silica and is a powder mainly composed of silica. The volcanic ash powder is preferably contained in the crude cementitious binder in an amount of 0.1 to 10 wt%.

The bentonite is hygroscopic and is used to improve workability and prevent material separation phenomenon. The bentonite is preferably contained in the crude cement based binder in an amount of 0.01 to 10% by weight. If the content of bentonite is less than 0.01% by weight, the effect of improving workability and preventing the separation of materials may be insufficient. If the content of bentonite is more than 10% by weight, the viscosity increases, It can be hard to expect.

The calcium silicate is used to develop initial strength and to prevent shrinkage. The calcium silicate is preferably contained in the crude cement based binder in an amount of 0.01 to 10 wt%. If the content of calcium silicate is less than 0.01% by weight, the effect of suppressing shrinkage may be insignificant. If the content of calcium silicate exceeds 10% by weight, workability may be deteriorated.

The above-mentioned roughening cement based binder may further contain 0.01 to 20% by weight of at least one material selected from fly ash and silica fume to improve latent hydraulic characteristics, long-term strength development and durability.

The crude cementitious binder may further include 0.01 to 5% by weight of lithium carbonate. When the lithium carbonate is contacted with water, the reaction rate is very fast. When the lithium carbonate is mixed with cement, it is possible to obtain the compressive strength obtained within a few days after several days. The lithium carbonate is preferably contained in the crude cement based binder in an amount of 0.01 to 5% by weight.

The crude cementitious binder may further include 0.01 to 5% by weight of a water reducing agent. 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 polycarboxylic acid based water reducing agents are preferably used. It is preferable that the water reducing agent is contained in the crude cement based binder in an amount of 0.01 to 5% by weight.

In addition, the crude cementitious binder may further include 0.01 to 5% by weight of a retarder. The retarder may be used for delaying rapid curing by gypsum to ensure workability for a certain period of time, and it is preferable that the retarder is contained in the crude cementitious binder in an amount of 0.01 to 5 wt%. 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 synthetic polymer admixture is used to improve the workability, strength and durability of concrete, and it is preferably contained in the polymer-incorporated precast concrete cement concrete composition in an amount of 0.01 to 20% by weight. The synthetic polymeric inclusion agent comprises a mono-unsaturated aromatic monomer, an acrylic monomer, an aliphatic conjugated monomer, and an unsaturated carboxylic acid monomer. The synthetic polymeric admixture comprises 1 to 97% by weight of a mono-unsaturated aromatic monomer, 1 to 97% by weight of an acrylic monomer, 1 to 97% by weight of an aliphatic conjugated monomer and 0.1 to 20% by weight of an unsaturated carboxylic acid monomer, .

The unsaturated aromatic monomer is used for improving the compressive strength and toughness. Examples of the unsaturated aromatic monomer include styrene, alphamethylstyrene, vinyltoluene, and mixtures thereof. The unsaturated aromatic monomer is preferably contained in the synthetic polymer based binder in an amount of 1 to 97% by weight. If the content of the unsaturated aromatic monomer is more than 97% by weight, no further performance improvement effect can be expected and price competitiveness may be lowered. If the content of the unsaturated aromatic monomer is less than 1% by weight, can do.

The acrylic monomer is used for improving strength and water resistance. Examples of the acrylic monomer include methyl methacrylate, methy acrylate, n-butyl acrylate or sec-butyl acrylate, 2-hydroxyethyl acrylate, , 2-ethylhexyl acrylate, or a mixture thereof may be used. The acrylic monomer is preferably contained in the synthetic polymer-based binder in an amount of 1 to 97% by weight. If the content of the acrylic monomer is more than 97% by weight, the strength and water resistance may be improved but the material separation phenomenon may easily occur. If the content of the acrylic monomer is less than 1% by weight, the effect of improving the strength and water- have.

The aliphatic conjugated monomer is used for improving warpage and adhesion strength. As the aliphatic conjugated monomer, butadiene, isoprene, or a mixture thereof may be used. The aliphatic conjugated monomer is preferably contained in the synthetic polymer-based binder in an amount of 1 to 97% by weight. If the content of the aliphatic conjugated monomer exceeds 97% by weight, the warpage and the adhesive strength may be increased, but the price competitiveness may be deteriorated. If the content of the aliphatic conjugated monomer is less than 1% by weight, have.

The unsaturated carboxylic acid monomer is added to improve dispersion and storage stability of the synthetic polymer-based binder and miscibility of the polymer-incorporated crude rigid cement concrete composition. Examples of the unsaturated carboxylic acid monomer include maleic acid or maleic anhydride, maleinimide, fumaric acid, itaconic acid, acrylic acid, acid or methacrylic acid, crotonic acid, or a mixture thereof. The unsaturated carboxylic acid monomer is preferably contained in the synthetic polymer-based binder in an amount of 0.1 to 20% by weight. If the content of the unsaturated carboxylic acid monomer is more than 20% by weight, the material separation phenomenon may easily occur. If the content of the unsaturated carboxylic acid monomer is less than 0.1% by weight, the effect of improving dispersion stability, storage stability, can do.

The synthetic polymer based binder may further comprise 0.01 to 15% by weight of ethylene vinyl acetate (EVA). The ethylene vinyl acetate (EVA) is used for improving the waterproof performance. The ethylene vinyl acetate (EVA) is preferably contained in the synthetic polymer binder in an amount of 0.01 to 15% by weight.

The synthetic polymer based binder may further include 0.01 to 15 wt% of polyvinyl alcohol (PVOH). The polyvinyl alcohol is used for improving the waterproof performance and the adhesive strength. The polyvinyl alcohol is preferably contained in the synthetic polymer binder in an amount of 0.01 to 15% by weight.

The synthetic polymer based binder may further comprise 0.01 to 15% by weight of polyvinyl acetate (PVAC). The polyvinyl acetate is used for improving waterproof performance and self-leveling property. The polyvinyl acetate is preferably contained in the synthetic polymer binder in an amount of 0.01 to 15% by weight.

The synthetic polymer based binder may further comprise 0.01 to 15% by weight of polymethyl methacrylate. The polymethyl methacrylate is used to improve water resistance or workability. The polymethyl methacrylate is preferably contained in the synthetic polymer binder in an amount of 0.01 to 15% by weight.

The synthetic polymer based binder may further comprise 0.01 to 15% by weight of polyacrylonitrile. The polyacrylonitrile is used to improve the strength. The polyacrylonitrile is preferably contained in the synthetic polymer binder in an amount of 0.01 to 15% by weight.

The synthetic polymer-based binder may further contain 0.01 to 5% by weight of a defoaming agent. The antifoaming agent is used to remove the pores in the concrete to increase the strength and durability of the concrete, and it is preferable that the antifoaming agent is contained in the synthetic polymer-based admixture in an amount of 0.01 to 5 wt%. 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 synthetic polymeric binder may further comprise from 0.01 to 5% by weight of air entraining agent. The air entraining agent is used to improve workability by improving the dispersibility of polymer-incorporated rigid 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 synthetic polymer-based admixture in an amount of 0.01 to 5 wt%.

The polymer-incorporated rigid cement concrete composition according to a preferred embodiment of the present invention is prepared by adding 5 to 35 wt% of a rigid cementitious binder, 20 to 70 wt% of fine aggregate, and 20 to 70 wt% of a coarse aggregate to a mixer, By weight of water, 0.1 to 20% by weight of water and 0.01 to 20% by weight of a synthetic polymeric admixture, and stirring for a predetermined time (for example, 1 to 10 minutes).

The maintenance method of a concrete structure according to a preferred embodiment of the present invention includes the steps of removing impurities and deteriorated portions by chipping a portion where concrete is deteriorated due to deterioration of a concrete structure using a crusher and a water jet, A step of removing residual asphalt residue and a waterproof layer using a small drum-mounted surface cutting machine; cleaning the chipped portion with a vacuum suction vehicle; and a step of easily attaching the polymer-mixed crude rigid cement concrete composition to the concrete structure Applying a surface layer protective material to the deteriorated portion of the concrete structure in order to improve the surface strength and to suppress penetration of water and penetration of chlorine ions and to improve water resistance and a step of applying a polymer protective cementitious cement concrete composition to the deteriorated portion Take steps to repair section and And the said polymer incorporated crude rigid cement comprising applying a concrete composition of the upper zero-curing.

The surface layer protective material is used for facilitating adhesion of the polymer-incorporated crude rigid cement concrete composition to a concrete structure, improving surface strength, inhibiting penetration of water, penetration of chlorine ions, and improving water resistance. Examples of the surface protective material include acryl, ethylene- A styrene butadiene rubber latex, a polyacrylic ester (PAE), and the synthetic polymer based admixture. At this time, it is preferable to lower the solid content of the surface layer protective material to about 13% by weight. When the solid content of the surface layer protective material is more than 13% by weight, the film thickness may become thick, and adhesion performance may be deteriorated.

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

≪ Example 1 >

18% by weight of a rigid cementitious binder, 40% by weight of a fine aggregate, and 37% by weight of a coarse aggregate were added to a mixer, and the mixture was forcedly stirred. Then, 2% by weight of water and 3% by weight of a synthetic polymer- Polymer - impregnated rigid cement concrete composition was prepared.

The crude cementitious binder is composed of 36 wt% of Portland cement, 40 wt% of calcium alumina cement, 5 wt% of gypsum slag, 10 wt% of blast furnace slag, 5 wt% of ash powder, 1 wt% of bentonite, 1 wt% of calcium silicate, , 1% by weight of a water reducing agent, 0.5% by weight of lithium carbonate, and 0.5% by weight of a retarder. A polycarboxylic acid-based water reducing agent was used as the water reducing agent, and glucose was used as the retarding agent.

The synthetic polymeric binder comprises 50 percent by weight of an unsaturated aromatic monomer, 20 percent by weight of an acrylic monomer, 20 percent by weight of an aliphatic conjugated monomer, 3 percent by weight of an unsaturated carboxylic acid monomer, 1 percent by weight of ethylene vinyl acetate, 1 percent by weight of polyvinyl alcohol, 1% by weight of vinyl acetate, 1% by weight of polymethyl methacrylate, 1% by weight of polyacrylonitrile, 1% by weight of a silicone antifoam agent and 1% by weight of a polycarboxylic acid air entraining agent were mixed and used. Styrene was used as the unsaturated aromatic monomer, methyl methacrylate was used as the acrylic monomer, butadiene was used as the aliphatic conjugated monomer, and itaconic acid was used as the unsaturated carboxylic acid monomer.

≪ Example 2 >

18% by weight of a crude cementitious binder, 40% by weight of a fine aggregate and 37% by weight of a coarse aggregate were added to a mixer, and the mixture was forcedly stirred. Then, 2% by weight of water and 3% by weight of a synthetic polymer- Followed by stirring to prepare a polymer-impregnated rigid cement concrete composition.

The crude cementitious binder is composed of 36 wt% of Portland cement, 40 wt% of calcium alumina cement, 5 wt% of gypsum slag, 10 wt% of blast furnace slag, 5 wt% of ash powder, 1 wt% of bentonite, 1 wt% of calcium silicate, , 1% by weight of a water reducing agent, 0.5% by weight of lithium carbonate, and 0.5% by weight of a retarder. A polycarboxylic acid-based water reducing agent was used as the water reducing agent, and glucose was used as the retarding agent.

The synthetic polymeric binder comprises 40% by weight of an unsaturated aromatic monomer, 25% by weight of an acrylic monomer, 25% by weight of an aliphatic conjugated monomer, 3% by weight of an unsaturated carboxylic acid monomer, 1% by weight of ethylene vinyl acetate, 1% by weight of vinyl acetate, 1% by weight of polymethyl methacrylate, 1% by weight of polyacrylonitrile, 1% by weight of a silicone antifoam agent and 1% by weight of a polycarboxylic acid air entraining agent were mixed and used. Styrene was used as the unsaturated aromatic monomer, methyl methacrylate was used as the acrylic monomer, butadiene was used as the aliphatic conjugated monomer, and itaconic acid was used as the unsaturated carboxylic acid monomer.

≪ Example 3 >

18% by weight of a crude cementitious binder, 40% by weight of a fine aggregate and 37% by weight of a coarse aggregate were added to a mixer, and the mixture was forcedly stirred. Then, 2% by weight of water and 3% by weight of a synthetic polymer- Followed by stirring to prepare a polymer-impregnated rigid cement concrete composition.

The crude cementitious binder is composed of 36 wt% of Portland cement, 40 wt% of calcium alumina cement, 5 wt% of gypsum slag, 10 wt% of blast furnace slag, 5 wt% of ash powder, 1 wt% of bentonite, 1 wt% of calcium silicate, , 1% by weight of a water reducing agent, 0.5% by weight of lithium carbonate, and 0.5% by weight of a retarder. A polycarboxylic acid-based water reducing agent was used as the water reducing agent, and glucose was used as the retarding agent.

The synthetic polymeric binder comprises 30% by weight of an unsaturated aromatic monomer, 30% by weight of an acrylic monomer, 30% by weight of an aliphatic conjugated monomer, 3% by weight of an unsaturated carboxylic acid monomer, 1% by weight of ethylene vinyl acetate, 1% by weight of vinyl acetate, 1% by weight of polymethyl methacrylate, 1% by weight of polyacrylonitrile, 1% by weight of a silicone antifoam agent and 1% by weight of a polycarboxylic acid air entraining agent were mixed and used. Styrene was used as the unsaturated aromatic monomer, methyl methacrylate was used as the acrylic monomer, butadiene was used as the aliphatic conjugated monomer, and itaconic acid was used as the unsaturated carboxylic acid monomer.

Comparative Examples are presented to more easily grasp the characteristics of Examples 1 to 3, and Comparative Examples 1 to 2 show ordinary Portland cement concrete compositions and acrylic mixed cement concrete compositions.

≪ Comparative Example 1 &

18% by weight of crude steel Portland cement, 40% by weight of fine aggregate, 37% by weight of coarse aggregate and 5% by weight of water were charged into a mixer and forcedly stirred to prepare a concrete composition.

≪ Comparative Example 2 &

18 wt% of crude steel Portland cement, 40 wt% of fine aggregate, and 37 wt% of coarse aggregate were charged into a mixer and forcedly stirred. Then, 2 wt% of water and 3 wt% of unsaturated aromatic monomer were further mixed and stirred for 2 minutes, A composition was prepared. Styrene was used as the unsaturated aromatic monomer.

The following test examples show experimental results in which the characteristics according to the present invention are compared with the characteristics of Comparative Example 1 and Comparative Example 2 in order to more easily grasp the characteristics of Examples 1 to 3 according to the present invention .

≪ Test Example 1 >

The polymer-incorporated crude rigid cement concrete composition prepared according to Examples 1 to 3 and the cement concrete composition prepared according to Comparative Example 1 and Comparative Example 2 were subjected to a slump test (degree of kneading) according to the method defined in KS F 2402, The results are shown in Fig. 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 18 16 13 11 8 Example 2 19 17 14 12 10 Example 3 19 18 16 14 11 Comparative Example 1 14 10 7 5 4 Comparative Example 2 19 14 10 8 7

As shown in Table 1, the polymer-incorporated rigid cement concrete composition prepared according to Examples 1 to 3 was superior in workability to the cement concrete composition prepared according to Comparative Example 1 and Comparative Example 2.

≪ Test Example 2 &

The polymer-incorporated rigid cement concrete compositions prepared according to Examples 1 to 3 and the concrete compositions prepared according to Comparative Examples 1 and 2 were subjected to a compressive strength test according to the method specified in KS F 2405 will be.

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 1 263 310 360 381 420 Example 2 272 319 370 390 435 Example 3 289 330 380 401 449 Comparative Example 1 220 291 330 360 401 Comparative Example 2 226 298 335 364 410

As shown in Table 2, the polymer-incorporated rigid 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 and 2.

≪ Test Example 3 >

The flexural strengths of the polymer-incorporated crude rigid cement concrete compositions prepared according to Examples 1 to 3 and the concrete compositions prepared according to Comparative Examples 1 and 2 were measured according to the method defined in KS F 2408 .

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 56 60 69 74 80 Example 2 59 65 72 78 83 Example 3 62 68 76 80 87 Comparative Example 1 49 53 60 66 72 Comparative Example 2 51 56 63 68 76

As shown in Table 3, the polymer-incorporated rigid cement concrete composition prepared according to Examples 1 to 3 had significantly higher flexural strength than the cement concrete composition prepared according to Comparative Example 1 and Comparative Example 2.

<Test Example 4>

The adhesive strengths of the polymer-incorporated crude rigid cement concrete compositions prepared according to Examples 1 to 3 and the cement concrete compositions prepared according to Comparative Examples 1 to 2 were measured according to the method specified in KS F 2762, The results are shown in Table 4.

division Adhesion strength (kgf / cm 2) After 12 hours After 24 hours 3 days later After 7 days After 28 days Example 1 15 16 18 20 21.5 Example 2 16 17 19.5 21.5 22.6 Example 3 17 17.5 20.2 23 23 Comparative Example 1 9 10 14 16 17.6 Comparative Example 2 12 13 15.8 18.9 20.3

As shown in Table 4 above, the polymer-incorporated rigid cement concrete compositions prepared according to Examples 1 to 3 had significantly higher bonding strength than the cement concrete compositions prepared according to Comparative Examples 1 and 2.

&Lt; Test Example 5 >

The polymer-incorporated crude rigid cement concrete composition prepared according to Examples 1 to 3 and the concrete composition prepared according to Comparative Example 1 and Comparative Example 2 were measured for water absorption rate according to the method 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 (%) 0.8 0.64 0.55 3.1 0.98

As shown in Table 5, the polymer-incorporated crude rigid cement concrete composition prepared according to Examples 1 to 3 had a lower water absorption rate than the cement concrete composition prepared according to Comparative Example 1 and Comparative Example 2.

&Lt; Test Example 6 >

The polymer-incorporated crude rigid cement concrete composition prepared according to Examples 1 to 3 and the concrete composition prepared according to Comparative Example 1 and Comparative Example 2 were measured for KS F 2424 (length change test method of concrete) The results are shown in Table 6 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Length change rate (%) 0.04 0.033 0.028 0.10 0.07

As shown in Table 6 above, the polymer-incorporated crude rigid cement concrete composition prepared according to Examples 1 to 3 had a reduced shrinkage in shrinkage as compared with the cement concrete composition prepared according to Comparative Example 1 and Comparative Example 2, It was confirmed that there was an effect.

&Lt; Test Example 7 >

The polymer incorporated crude rigid cement concrete composition prepared according to Examples 1 to 3 and the concrete composition prepared according to Comparative Example 1 and Comparative Example 2 were tested by JIS A 1171 (Test Method of Polymer Cement Mortar) , And the results are shown in Table 7.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Neutralization depth (mm) 0.38 0.31 0.25 1.3 0.6

As shown in Table 7 above, the polymer incorporated crude rigid cement concrete composition prepared according to Examples 1 to 3 had a smaller neutralization penetration depth than the cement concrete compositions prepared according to Comparative Examples 1 and 2, And that the resistance to

<Test Example 8>

The polymer-incorporated crude rigid cement concrete compositions prepared according to Examples 1 to 3 and the concrete compositions prepared according to Comparative Examples 1 and 2 were tested by JIS A 1171 and the results are shown in Table 8 Respectively.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Chloride ion penetration depth (mm) 0.9 0.7 0.45 2.5 1.2

As shown in Table 8 above, the polymer-incorporated rigid cement concrete compositions prepared according to Examples 1 to 3 had a lower chloride ion penetration depth than the cement concrete compositions prepared according to Comparative Example 1 and Comparative Example 2 It was confirmed that the resistance to salting was high.

&Lt; Test Example 9 >

The polymer-incorporated crude rigid cement concrete composition prepared according to Examples 1 to 3 and the concrete composition prepared according to Comparative Example 1 and Comparative Example 2 were subjected to the freeze-thaw resistance test according to the method specified in KS F 2456 . 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 9 shows 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 90 91 91 58 88

As shown in Table 9, since the polymer-incorporated crude rigid cement concrete composition prepared according to Examples 1 to 3 has a significantly higher durability index than the cement concrete composition prepared according to Comparative Example 1 and Comparative Example 2, The durability is improved.

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 (12)

The polymer-impregnated rigid cement concrete composition comprises 5 to 35% by weight of a rigid cementitious binder, 20 to 70% by weight of fine aggregate, 20 to 70% by weight of coarse aggregate, 0.1 to 20% by weight of water and 0.01 to 20% / RTI &gt;
Wherein the synthetic polymeric admixture comprises 1 to 97 wt% of an unsaturated aromatic monomer, 1 to 97 wt% of an acrylic monomer, 1 to 97 wt% of an aliphatic conjugated monomer, and 0.1 to 20 wt% of an unsaturated carboxylic acid monomer,
Wherein the crude cementitious binder is a mixture of 30 to 80 wt% of Portland cement, 5 to 50 wt% of calcium alumina cement, 1 to 10 wt% of gypsum, 1 to 20 wt% of blast furnace slag, 0.1 to 10 wt% To 10% by weight of calcium silicate and 0.01 to 10% by weight of calcium silicate.
The method of claim 1, wherein the unsaturated aromatic monomer comprises at least one material selected from styrene, alpha-methylstyrene, and vinyltoluene,
The acrylic monomer includes at least one material selected from methyl methacrylate, methyl acrylate, butyl acrylate, 2-hydroxyethyl acrylate, and 2-ethylhexyl acrylate,
Wherein the aliphatic conjugated monomer comprises at least one material selected from butadiene and isoprene,
Wherein the unsaturated carboxylic acid monomer comprises at least one material selected from maleic anhydride, maleic anhydride, fumaric acid, itaconic acid, acrylic acid and crotonic acid. Cement concrete composition.
The polymer-incorporated rigid cement concrete composition of claim 1, wherein the synthetic polymer-based binder further comprises 0.01 to 15% by weight of ethylene-vinyl acetate (EVA).
The polymer-incorporated rigid cement concrete composition of claim 1, wherein the synthetic polymer-based binder further comprises 0.01 to 15% by weight of polyvinyl alcohol (PVOH).
The polymer-incorporated rigid cement concrete composition of claim 1, wherein the synthetic polymer-based binder further comprises from 0.01 to 15% by weight of polyvinyl acetate (PVAC).
The polymer-incorporated rigid cement concrete composition of claim 1, wherein the synthetic polymer-based binder further comprises 0.01 to 15% by weight of polymethyl methacrylate.
The polymer-incorporated rigid cement concrete composition of claim 1, wherein the synthetic polymer-based binder further comprises 0.01 to 15% by weight of polyacrylonitrile.
delete The polymer-incorporated rigid cement concrete composition according to claim 1, wherein the rigid cement based binder further comprises 0.01 to 20% by weight of at least one material selected from fly ash and silica fume.
The polymer-incorporated rigid cement concrete composition according to claim 1, wherein the crude rigid cement based binder further comprises 0.01 to 5% by weight of lithium carbonate.
Removing impurities and deteriorated portions by chipping a portion where concrete is deteriorated due to deterioration of a concrete structure using a crusher and a water jet;
Removing residual asphalt residue and waterproof layer using a drum-mounted surface cutting machine to suppress the occurrence of a step;
Cleaning the chipped portion with a vacuum suction vehicle;
The method of claim 1, wherein, in order to facilitate adhesion of the polymer-incorporated crude rigid cement concrete composition to the concrete structure, to improve surface strength, to inhibit penetration of water and chlorine ion penetration, and to improve water resistance, ;
Inserting the polymer-incorporated crude rigid cement concrete composition to restore a section of the deteriorated portion; And
And a step of applying the polymer-incorporated crude rigid cement concrete composition composition with the curing agent.
12. The concrete structure according to claim 11, wherein the surface layer protective material comprises at least one selected from the group consisting of acrylic, ethylene-vinyl acetate, styrene-butadiene rubber latex, polyacrylic ester and the synthetic polymer- Maintenance method.