KR101498991B1 - Polymer modified rapid-hardening cement concrete composition and repairing method of concrete structure using the composition - Google Patents

Abstract

The present invention relates to a polymer-modified rapid-hardening cement concrete composition containing 8 to 35 wt% of rapid-hardening cement-based binding material, 20 to 65 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 polymer-based modifier, in which the polymer-based modifier contains 75 to 99 wt% of styrene-acryl emulsion, 0.01 to 15 wt% of polymethacrylic acid methyl, 0.01 to 15 wt% of polybutadiene, 0.01 to 15 wt% of methacrylic acid methyl butadiene, and 0.01 to 15 wt% of vinyl toluene, and a repairing method for a concrete structure using the same. According to the present invention, concrete operability and concrete durability are improved based on the addition of the polymer-based modifier in which the styrene-acryl emulsion, polymethacrylic acid methyl, polybutadiene, methacrylic acid methyl butadiene, and vinyl toluene are mixed and the rapid-hardening 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 light-modulus cement concrete composition for polymer reforming and a method for repairing a concrete structure using the same,

The present invention relates to a cement concrete composition and a maintenance method for a concrete structure using the same, and more particularly, to a cement concrete composition for polymer reforming, which is used for road surface packaging, bridge bridge pavement, And a maintenance method of a concrete structure using the same.

In developed countries, which have been interested in concrete pavement, we have accumulated detailed data and experience from design to construction and maintenance. Through the theoretical approach through academic research, we are constantly improving the design method for concrete pavement, And the introduction of new laws are being promoted.

In general, the concrete pavement is rigid and has a limitation on the construction in the temperature and the surrounding environment, the curing period is long, the cracks due to drying shrinkage, the unfavorable riding comfort and comfort are disadvantageous, And some of them are applied to highway and medium-sized roads.

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

On the other hand, when cracks occur in the concrete due to 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. Exposed concrete undergoes neutralization and corrosion of the reinforcing 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.

Korean Patent Registration No. 10-1300514

The problem to be solved by the present invention is to improve the workability of concrete by adding a polymer modifier mixed with styrene-acrylic emulsion, polymethyl methacrylate, polybutadiene, methyl methacrylate butadiene and vinyl toluene, and a light- To improve the durability of concrete and to reduce defects of concrete by improving bending strength, tensile strength, initial strength, long-term strength, flame retardancy and freeze-thaw resistance, and to provide a cementitious cementitious concrete- Maintenance method.

The present invention relates to a cementitious mortar composition comprising 8 to 35 wt% of a fast cement type binder, 20 to 65 wt% of fine aggregate, 20 to 70 wt% of coarse aggregate, 0.1 to 20 wt% of water and 0.01 to 20 wt% The system modifying agent is selected from the group consisting of 75-99 wt% styrene-acrylic emulsion, 0.01-15 wt% polymethyl methacrylate, 0.01-15 wt% polybutadiene, 0.01-15 wt% methyl methacrylate butadiene, 0.01-15 wt% The present invention provides a polymer modified cementitious cementitious concrete composition.

The polymeric modifier may further comprise 0.01 to 10% by weight of fumaric acid.

The polymer modifier may further comprise 0.01 to 10% by weight of polyisobutylene.

The polymeric modifier may further comprise 0.01 to 15% by weight of polyacrylonitrile.

Wherein the quick-setting cementitious binder comprises 30 to 80 wt% of crude steel Portland cement, 5 to 50 wt% of calcium alumina cement, 5 to 45 wt% of amorphous calcium aluminate, 0.01 to 10 wt% of gypsum, 0.01 to 20 wt% 0.01 to 10% by weight of rice husk ash, 0.01 to 10% by weight of bentonite and 0.01 to 10% by weight of calcium acetate.

The fast-curing type 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 fast-curing type cement based binder may further comprise 0.01 to 5% by weight of at least one material selected from polyvinyl alcohol, methylcellulose, starch and gum.

The fast curing type cement based binder may further include 0.01 to 10% by weight of lithium carbonate.

According to another aspect of the present invention, there is provided a method of manufacturing a concrete structure, comprising: a step of chipping a portion where a concrete structure is deteriorated due to deterioration of a concrete structure using a crusher and a water jet to remove impurities and deteriorated portions; Removing the asphalt residue and the watertight layer; cleaning the chipped portion with a vacuum suction vehicle; facilitating adhesion of the polymer modified cementitious cementitious concrete composition to the concrete structure, improving surface strength, Applying a surface layer reinforcement to a deteriorated portion of the concrete structure to suppress ion penetration and improve water resistance, restoring a section of the deteriorated portion by placing the polymer modified cementitious cement concrete composition, Modified light cement concrete composition And applying a curing agent to the upper portion of the concrete structure.

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

According to the present invention, it is possible to improve the workability of the concrete by adding a polymer modifier mixed with styrene-acrylic emulsion, polymethyl methacrylate, polybutadiene, methyl methacrylate butadiene and vinyl toluene, And can reduce defects of concrete by improving bending strength, tensile strength, initial strength, long-term strength, salt resistance and freeze-thaw resistance, in particular.

The addition of the polymer modifier 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.

It can be used for the development of initial strength and long-term strength, durability, flame retardancy, durability and corrosion resistance by containing fast-curing type cementitious binder including crude steel Portland cement, calcium alumina cement, amorphous calcium aluminate, gypsum slag, blast furnace slag, rice husk ash, bentonite, 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.

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-modified cementitious cement concrete composition according to a preferred embodiment of the present invention comprises 8 to 35 wt% of a fast cement type binder, 20 to 65 wt% of a fine aggregate, 20 to 70 wt% of a coarse aggregate, 0.1 to 20 wt% And 0.01 to 20% by weight of a modifier.

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-modified light weight cement concrete composition in an amount of 20 to 65 wt%, and the coarse aggregate is preferably contained in the polymer modified light weight type cement concrete composition in an amount of 20 to 70 wt%.

The quick-setting cementitious binder includes crude steel portland cement, calcium alumina cement, amorphous calcium aluminate, gypsum, blast furnace slag, rice husk ash, bentonite and calcium acetate. Wherein the quick-setting cementitious binder comprises 30 to 80 wt% of crude steel Portland cement, 5 to 50 wt% of calcium alumina cement, 5 to 45 wt% of amorphous calcium aluminate, 0.01 to 10 wt% of gypsum, 0.01 to 20 wt% 0.01 to 10% by weight of rice husk ash, 0.01 to 10% by weight of bentonite and 0.01 to 10% by weight of calcium acetate. It is preferable that the fast-curing type cement based binder is contained in the polymer-modified light cement concrete composition in an amount of 8 to 35% by weight.

It is preferable that the crude steel portland cement specified in KS is used. The crude steel portland cement is preferably contained in the fast-curing type 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 fast-curing type cement based binder in an amount of 5 to 50 wt%. If the content of calcium alumina cement is less than 5% by weight, the effect of improving the strength of concrete and the effect of suppressing cracking may be insignificant. When the content of calcium alumina cement is more than 50% by weight, It is not economical because of poor quality and manufacturing cost.

As the weight ratio of the amorphous calcium aluminate increases, it exhibits fast curing properties. The amorphous calcium aluminate is preferably contained in the fast curing type cement based binder in an amount of 5 to 45% by weight. If the content of the amorphous calcium aluminate is less than 5% by weight, the effect of improving the strength of the concrete and the effect of suppressing cracking may be insufficient. When the content of the amorphous calcium aluminate exceeds 45% by weight, One is poor in workability and the manufacturing cost is not economical.

The gypsum plaster is used for initial strength development. When the content of the gypsum is increased, rapid curing characteristics are exhibited. If the content of the gypsum is less than 0.01% by weight, the effect of improving the initial strength of the polymer-modified light cement concrete composition may be insufficient. If 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 fast curing type cement based binder in an amount of 0.01 to 20% by weight.

The rice husk ash is used for improving latent hydraulic characteristics, long-term strength development and durability. Rice husks Ash contains a lot of silica as rice husk ash. The rice husk ash is preferably contained in the fast-curing type binder in an amount of 0.01 to 10% by weight.

The bentonite is hygroscopic and is used to improve workability and prevent material separation phenomenon. The bentonite is preferably contained in the fast curing type 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 acetate is used to develop early strength and to prevent shrinkage. The calcium acetate is preferably contained in the fast-curing type cement based binder in an amount of 0.01 to 10 wt%. If the content of calcium acetate is less than 0.01% by weight, the early strength development and shrinkage inhibiting effect may be insufficient. If the content of calcium acetate exceeds 10% by weight, workability may be deteriorated.

The fast-curing type cement based binder may further include 0.01 to 20% by weight of at least one material selected from fly ash and silica fume. Fly ash, and silica fume is used for improving latent hydraulic characteristics, long-term strength development, and durability. One or more materials selected from the above fly ash and silica fume are contained in 0.01 to 20% by weight of a fast- .

The fast curing type cement based binder may further comprise 0.01 to 5% by weight of at least one material separation preventing agent selected from polyvinyl alcohol, methylcellulose, starch and gum. The above-mentioned material separation preventing agent is used to prevent material separation of the fast-light cement type binder and to improve workability. The material separation preventing agent may include at least one substance selected from polyvinyl alcohol, methylcellulose, starch, and gum. The material separation preventing agent is preferably contained in the fast-curing type cement based binder in an amount of 0.01 to 5% by weight.

In addition, the fast curing type cement based binder may further include 0.01 to 10% by weight of lithium carbonate. The lithium carbonate is used for early strength development and durability improvement. The lithium carbonate is preferably contained in the fast-curing type cement based binder in an amount of 0.01 to 10 wt%. If the content of lithium carbonate is less than 0.01% by weight, the effect of improving the curing rate and strength may be insufficient. If the content of lithium carbonate exceeds 10% by weight, the curing rate and strength may be improved but the workability may be deteriorated.

The fast curing type cement based binder may further contain 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. The water reducing agent is preferably contained in the fast curing type cement based binder in an amount of 0.01 to 5% by weight.

Further, the fast-curing type cement based binder may further contain 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 fast-curing type cement based 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 polymer modifier is used to improve the workability, strength and durability of concrete, and it is preferable that the polymer modifier is contained in 0.01-20% by weight of the polymer modified cement concrete composition. The polymer modifier includes styrene-acrylic emulsion, methyl polymethacrylate, polybutadiene, methylbutadiene methacrylate, and vinyltoluene. Wherein the polymer modifier is selected from the group consisting of 75-99 wt% styrene-acrylic emulsion, 0.01-15 wt% polymethyl methacrylate, 0.01-15 wt% polybutadiene, 0.01-15 wt% methyl methacrylate butadiene, % By weight.

The styrene-acrylic emulsion is used to improve strength and durability. The styrene-acrylic emulsion is preferably contained in the polymer modifier in an amount of 75 to 99 wt%. If the content of the styrene-acrylic emulsion is less than 75% by weight, the effect of improving the strength and durability may be deteriorated. If the content of the styrene-acrylic emulsion exceeds 99% by weight, the effect of improving the strength and durability is excellent but not economical.

Addition of methyl polymethacrylate to the polymer modifier improves adhesion and flexural toughness. The polymethyl methacrylate is preferably contained in the polymer modifier in an amount of 0.01 to 15% by weight. If the content of the polymethyl methacrylate exceeds 15% by weight, the adhesive strength and flexural toughness of the light modulus cement concrete composition for polymer modification can be improved but the viscosity may be increased, resulting in poor workability and poor price competitiveness. The polymethyl methacrylate If the content is less than 0.01% by weight, the effect of improving the flexural toughness and adhesion may be insignificant.

Addition of polybutadiene to the polymer modifier improves dispersibility and water resistance. The polybutadiene is preferably contained in the polymer modifier in an amount of 0.01 to 15% by weight. If the content of the polybutadiene exceeds 15% by weight, the dispersibility and water resistance of the polymer-modified cementitious cementitious concrete composition may be improved but the viscosity may be increased, resulting in poor workability and poor price competitiveness. If the content of the polybutadiene is less than 0.01% By weight, the effect of improving dispersibility and water resistance may be insignificant.

The addition of methyl methacrylate butadiene to the polymer modifier improves workability and strength. The methyl methacrylate butadiene is preferably contained in the polymer modifier in an amount of 0.01 to 15% by weight. If the content of methylbutadiene methacrylate exceeds 15% by weight, the strength of the polymer-modified light cement concrete composition may be improved but the viscosity may be increased, resulting in poor workability and poor price competitiveness. When the content of methylbutyrate methacrylate is 0.01 If the amount is less than 10% by weight, the effect of improving workability and strength may be insignificant.

The addition of vinyl toluene to the polymeric modifier improves compressive strength and toughness. The vinyltoluene is preferably contained in the polymer modifier in an amount of 0.01 to 15% by weight. If the content of the vinyltoluene exceeds 15% by weight, the compression strength and toughness of the polymer-modified light cement concrete composition may be improved but the price competitiveness may be deteriorated. If the content of the vinyltoluene is less than 0.01% by weight, can do.

The polymeric modifier may further comprise 0.01 to 10% by weight of fumaric acid. The fumaric acid is used to improve dispersibility and storage stability. The fumaric acid is preferably contained in the polymer modifier in an amount of 0.01 to 10 wt%.

In addition, the polymer modifier may further include 0.01 to 10 wt% of polyisobutylene. The polyisobutylene is used for improving warpage and adhesion strength. The polyisobutylene is preferably contained in the polymer modifier in an amount of 0.01 to 10 wt%.

The polymeric modifier 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 polymer modifier in an amount of 0.01 to 15% by weight.

The polymer modifier may further comprise 0.01 to 5 wt% of a defoaming agent. 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 5 wt% to the polymer type modifier. 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.

In addition, the polymer modifier may further comprise 0.01 to 5% by weight of air entraining agent. The air entraining agent is used to improve workability by improving the dispersibility of the polymer modified cementitious 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 modifier in an amount of 0.01 to 5% by weight.

The polymer modified cementitious cement concrete composition according to a preferred embodiment of the present invention is prepared by mixing 8 to 35 wt% of a fast cement type binder, 20 to 65 wt% of a fine aggregate, and 20 to 70 wt% of a coarse aggregate in a mixer, , 0.1 to 20% by weight of water and 0.01 to 20% by weight of a polymer modifier, 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, Removing the residual asphalt residue and waterproof layer using a small cutting drum mounted crusher, cleaning the chipped portion with a vacuum suction vehicle, and allowing the polymer reforming lightweight cementitious concrete composition to adhere to the concrete structure Applying a surface layer reinforcing material to the deteriorated portion of the concrete structure in order to improve the surface strength and to suppress water penetration and chlorine ion penetration and improve water resistance, The step of recovering the cross section of And applying the upper part of the polymer modified cementitious cement concrete composition with the curing agent.

The surface layer reinforcing material is used for facilitating adhesion of the polymer modified cementitious light cement concrete composition to the concrete structure, improving the surface strength, inhibiting penetration of water and penetration of chlorine ions, and improving water resistance, and acrylic, ethylene vinyl acetate, A styrene butadiene rubber latex, a polyacrylic ester (PAE), and a polymer modifier. At this time, it is preferable to lower the solid content of the surface layer reinforcement 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.

Hereinafter, embodiments of the polymer modified cementitious cementitious 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 wt% of a fast cement type binder, 42 wt% of a fine aggregate, and 35 wt% of a coarse aggregate were charged into a mixer and forcedly stirred. Then, 2 wt% of water and 3 wt% of a polymer modifier were further mixed, A polymer modified cementitious cement concrete composition was prepared.

At this time, the fast-curing type cementitious binder is composed of 33 wt% crude steel portland cement, 25 wt% calcium alumina cement, 20 wt% amorphous calcium aluminate, 5 wt% gypsum slag, 10 wt% blast furnace slag, 3 wt% 1% by weight of calcium acetate, 0.5% by weight of a water reducing agent, 0.5% by weight of an anti-segregation agent, 0.5% by weight of lithium carbonate and 0.5% by weight of a retarder. As the water reducing agent, a polycarboxylic acid based water reducing agent was used, starch type material separation preventing agent was used as the material separation preventing agent, and glucose was used as the delaying agent.

The polymeric modifier may be selected from the group consisting of 92 wt% styrene-acrylic emulsion, 2 wt% polymethyl methacrylate, 1 wt% polybutadiene, 1 wt% methyl methacrylatebutadiene, 1 wt% vinyltoluene, 1 wt% 1% by weight of isobutylene, 0.5% by weight of an antifoam agent and 0.5% by weight of an air entraining agent were mixed and used. The antifoaming agent used was glycol, and the air entraining agent was a polycarboxylic acid-based air entraining agent.

≪ Example 2 >

18 wt% of a fast cement type binder, 42 wt% of a fine aggregate, and 35 wt% of a coarse aggregate were charged into a mixer and forcedly stirred. Then, 2 wt% of water and 3 wt% of a polymer modifier were further mixed, A polymer modified cementitious cement concrete composition was prepared.

In this case, the quick-setting cementitious binder includes 33 wt% of crude steel portland cement, 25 wt% of calcium alumina cement, 20 wt% of amorphous calcium aluminate, 5 wt% of gypsum, 10 wt% of blast furnace slag, 3 wt% 1% by weight of bentonite, 1% by weight of calcium acetate, 0.5% by weight of a water reducing agent, 0.5% by weight of a material separation inhibitor, 0.5% by weight of lithium carbonate and 0.5% by weight of a retarder. As the water reducing agent, a polycarboxylic acid based water reducing agent was used. As the material separation preventing agent, starch-based material separation preventing agent was used. Lithium carbonate was used as the accelerator, and glucose was used as the delaying agent.

The polymeric modifier may be selected from the group consisting of 87 wt% styrene-acrylic emulsion, 3 wt% polymethyl methacrylate, 2 wt% polybutadiene, 2 wt% methyl methacrylate butadiene, 2 wt% vinyltoluene, 2 wt% 1% by weight of isobutylene, 0.5% by weight of an antifoam agent and 0.5% by weight of an air entraining agent were mixed and used. The antifoaming agent used was glycol, and the air entraining agent was a polycarboxylic acid-based air entraining agent.

≪ Example 3 >

18 wt% of a fast cement type binder, 42 wt% of a fine aggregate, and 35 wt% of a coarse aggregate were charged into a mixer and forcedly stirred. Then, 2 wt% of water and 3 wt% of a polymer modifier were further mixed, A polymer modified cementitious cement concrete composition was prepared.

At this time, the fast-curing type cement based binder usually contains 33 wt% of Portland cement, 25 wt% of calcium alumina cement, 20 wt% of amorphous calcium aluminate, 5 wt% of gypsum, 10 wt% of blast furnace slag, 3 wt% 1% by weight of bentonite, 1% by weight of calcium acetate, 0.5% by weight of a water reducing agent, 0.5% by weight of a material separation inhibitor, 0.5% by weight of lithium carbonate and 0.5% by weight of a retarder. As the water reducing agent, a polycarboxylic acid based water reducing agent was used, starch type material separation preventing agent was used as the material separation preventing agent, and glucose was used as the delaying agent.

The polymeric modifier may be selected from the group consisting of 82 wt% styrene-acrylic emulsion, 4 wt% polymethyl methacrylate, 3 wt% polybutadiene, 3 wt% methyl methacrylate butadiene, 3 wt% vinyl toluene, 2 wt% 2% by weight of isobutylene, 0.5% by weight of an antifoam agent and 0.5% by weight of an air entraining agent were mixed and used. The antifoaming agent used was glycol, and the air entraining agent was a polycarboxylic acid-based air entraining agent.

Comparative Examples are shown in order to more easily grasp the characteristics of Examples 1 to 3, and Comparative Examples 1 to 2 show an ordinary Portland cement concrete composition and an acrylic modified cement concrete composition.

≪ Comparative Example 1 &

18% by weight of crude steel Portland cement, 42% by weight of fine aggregate, 35% 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% by weight of crude steel Portland cement, 42% by weight of fine aggregate, and 35% by weight of coarse aggregate were put into a mixer and stirred forcibly. Then, 2% by weight of water and 3% by weight of styrene- acryl emulsion were further mixed, A concrete composition was prepared.

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 modified cementitious cement concrete compositions prepared according to Examples 1 to 3 and the cement concrete compositions prepared according to Comparative Examples 1 and 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 Example 1 19 17 14 10 Example 2 20 17 15 11 Example 3 19 17 15 11 Comparative Example 1 15 10 7 5 Comparative Example 2 20 15 10 6

As shown in Table 1 above, the polymer modified cementitious 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 results of compressive strength tests of the polymer modified cementitious concrete cement concrete compositions prepared according to Examples 1 to 3 and the concrete compositions prepared according to Comparative Examples 1 and 2 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 3 hours After 12 hours After 1 day After 7 days After 28 days Example 1 260 345 368 390 418 Example 2 269 351 378 399 425 Example 3 276 358 389 407 431 Comparative Example 1 - - 207 336 408 Comparative Example 2 - - 210 344 412

As shown in Table 2 above, the polymer modified cementitious cement concrete compositions prepared according to Examples 1 to 3 can be cured after 3 hours after the application, so that other operations can be performed on the concrete. Also, after fully cured, the polymer modified cementitious cement concrete compositions prepared according to Examples 1 to 3 had significantly higher compressive strength than the cement concrete compositions prepared according to Comparative Example 1 and Comparative Example 2.

≪ Test Example 3 >

The flexural strengths of the polymer-modified cementitious concrete 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 3 hours After 12 hours After 1 day After 7 days After 28 days Example 1 51 58 62 69 76 Example 2 54 60 66 73 82 Example 3 58 63 68 77 85 Comparative Example 1 - - 35 52 58 Comparative Example 2 - - 41 58 69

As shown in the above Table 3, the polymer modified cementitious cement concrete composition prepared according to Examples 1 to 3 hardened after 3 hours of application, causing resistance to external load, Is not generated. In particular, after 28 days after the concrete was completely cured, the polymer-modified lightweight cementitious concrete compositions prepared according to Examples 1 to 3 had significantly higher flexural strengths than the cementitious concrete compositions prepared according to Comparative Examples 1 and 2 .

<Test Example 4>

The adhesive strength of the polymer modified cementitious concrete 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 3 hours After 12 hours After 1 day After 7 days After 28 days Example 1 15 16 18 20 23 Example 2 16 17.5 19 21.5 25 Example 3 17 18 20 22.5 26.5 Comparative Example 1 - - - 15 17.5 Comparative Example 2 - - - 17 20.5

As shown in Table 4, the polymer modified cementitious 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 modified cementitious concrete cement concrete compositions prepared according to Examples 1 to 3 and the concrete compositions prepared according to Comparative Examples 1 and 2 were measured for water absorption 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 0.5 0.4 3.1 1.1

As shown in Table 5, the polymer modified cementitious cement concrete compositions prepared according to Examples 1 to 3 had a lower water absorption rate than the cement concrete compositions prepared according to Comparative Examples 1 and 2.

&Lt; Test Example 6 >

The polymer-modified cementitious 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 (%) 0.03 0.028 0.021 0.10 0.08

As shown in Table 6 above, the polymer-modified cementitious cement concrete composition produced 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 modified mortar type cementitious 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 (Test Method for 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) 0.3 0.2 0.18 1.5 0.65

As shown in Table 7 above, the polymer modified cementitious concrete cement concrete compositions prepared according to Examples 1 to 3 had less neutralization penetration depth than the cement concrete compositions prepared according to Comparative Example 1 and Comparative Example 2, And that the resistance to

<Test Example 8>

The polymer modified cementitious concrete 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 0.75 0.61 2.6 1.2

As shown in Table 8 above, the polymer modified cementitious concrete cement concrete compositions prepared according to Examples 1 to 3 had less 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 10 &

The results of the measurement of the freeze-thaw resistance test according to the method defined in KS F 2456 for the polymer-modified cementitious concrete cement concrete compositions prepared according to Examples 1 to 3 and the concrete compositions prepared according to Comparative Examples 1 and 2 . 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 10 shows the durability indexes 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 92 60 88

As shown in Table 10, the durability index of the polymer modified cementitious concrete cement concrete composition prepared according to Examples 1 to 3 is much higher than that of the cement concrete compositions prepared according to Comparative Example 1 and Comparative Example 2, It was found that the durability was 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 (10)

A cementitious binder of a fast curing type, 20 to 65 wt% of a fine aggregate, 20 to 70 wt% of a coarse aggregate, 0.1 to 20 wt% of water and 0.01 to 20 wt% of a polymer modifier,
Wherein the polymer modifier is selected from the group consisting of 75-99 wt% styrene-acrylic emulsion, 0.01-15 wt% polymethyl methacrylate, 0.01-15 wt% polybutadiene, 0.01-15 wt% methyl methacrylate butadiene, % By weight,
Wherein the quick-setting cementitious binder comprises 30 to 80 wt% of crude steel Portland cement, 5 to 50 wt% of calcium alumina cement, 5 to 45 wt% of amorphous calcium aluminate, 0.01 to 10 wt% of gypsum, 0.01 to 20 wt% 0.01 to 10% by weight of bentonite, and 0.01 to 10% by weight of calcium acetate, based on the total weight of the cement composition.
The polymer modified cementitious cementitious concrete composition of claim 1, wherein the polymer modifier further comprises 0.01 to 10 wt% of fumaric acid.
The polymer reforming light weight cementitious concrete composition according to claim 1, wherein the polymer modifier further comprises 0.01 to 10 wt% of polyisobutylene.

The polymer modified cementitious cementitious concrete composition of claim 1, wherein the polymer modifier further comprises 0.01 to 15 wt% of polyacrylonitrile.
delete The cement based concrete composition of claim 1, wherein the quick-setting cement based binder further comprises 0.01 to 20 wt% of at least one selected from fly ash and silica fume.
The polymer reforming material according to claim 1, wherein the fast-curing type cement based binder further comprises 0.01 to 5% by weight of at least one material selected from polyvinyl alcohol, methylcellulose, starch and gum. Light type cement concrete composition.
The cementitious cementitious concrete composition of claim 1, wherein the fast cementitious binder further comprises 0.01 to 10% 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 the residual asphalt residue and the waterproof layer using a cutting drum mounted crusher to suppress the occurrence of a step;
Cleaning the chipped portion with a vacuum suction vehicle;
A cementitious cementitious concrete composition as claimed in any one of claims 1 to 3, wherein the cementitious cementitious concrete composition comprises a surface layer reinforcing material for improving the surface strength of the concrete structure, preventing water penetration and chlorine ion penetration, ;
Repairing the cross-section of the deteriorated portion by placing the polymer-modified cementitious cementitious concrete composition; And
And applying the upper part of the polymer-modified cementitious cement concrete composition with the curing agent.
10. The method of claim 9, wherein the surface layer reinforcement material comprises at least one selected from the group consisting of acrylic, ethylene-vinyl acetate, styrene-butadiene rubber latex, polyacrylic ester, Method.