KR101446245B1 - Color cement mortar composition with excellent durability for repairing concrete structure and method for repairing concrete structure using the composition - Google Patents

Abstract

The present invention relates to a color cement mortar composition for repairing a concrete structure and a method for repairing a concrete structure using the same, wherein the color cement mortar composition comprises 5-70 wt% of an inorganic-based binder including an inorganic pigment, 25-85 wt% of a fine aggregate, 0.01-20 wt% of a polymer-based admixture, and 0.1-20 wt% of water, and the polymer-based admixture includes 50-99 wt% of styrene-butadiene, 0.1-20 wt% of polymethyl metacrylate, 0.1-20 wt% of a silicate resin, and 0.1∼20 wt% of a silane resin. According to the present invention, the color cement mortar composition has strength and durability and especially, excellent neutralization resistance, acid resistance, and salt resistance, so that the color cement mortar composition can be used for: cross section restoring and repairing final work for a bridge, a sewage culvert, a neutralized underground roadway, a tunnel which is restored after a fire occurs, and an expressway structure damaged by salt due to a deicing agent; final work for a concrete pier of a railroad bridge; final work for a newly-constructed concrete bridge; a final work for concrete on the outside of a building; and functions in preventing the neutralization and improving the durability and legibility of all concrete structures such as an underground parking lot, a filtration plant, and a sewage disposal plant structure. In the present invention, for construction, an automatic facility is used, so that construction can be easily performed. Construction duration is shortened and labor costs are reduced, so that economical feasibility is ensured. Excellent construction qualities are maintained, so that maintenance costs can be remarkably reduced. The fine aggregate used in the present invention is mixed with dolomite having excellent strength, wear resistance, and fire resistance, so that color cement mortar composition has excellent wear resistance, landscape-harmonized properties, and fire resistance.

Description

Technical Field [0001] The present invention relates to a color cement mortar composition for repairing a concrete structure having excellent durability and a method for repairing a concrete structure using the same,

The present invention relates to a color cement mortar composition for repairing concrete structures and a method for repairing concrete structures using the same. More particularly, the present invention relates to a color cement mortar composition for repairing concrete structures, Repair work after completion of roads and highways, repair work on end sections of highway structures damaged by fusing agents, finishing of concrete piers of railway bridges, finishing of newly constructed concrete bridges, finishing of concrete outside of buildings It can be used for prevention of neutralization of all concrete structures such as underground parking lot, water purification plant and sewage treatment plant structure, durability improvement and visibility improvement, and it is economical through construction convenience, shortening of air, and labor cost by using automation equipment. , Maintain excellent construction quality A color cement mortar composition for repairing concrete structures excellent in strength, abrasion resistance, surface smoothness and fire resistance by using a fine aggregate containing dolomite excellent in strength, abrasion resistance and fire resistance and capable of remarkably reducing management cost And a method of repairing a concrete structure.

The deterioration of the concrete structure is caused by the deterioration of the concrete due to chemical attack, alkali aggregate reaction, fatigue, discoloration due to vehicle smoke, deterioration due to fire, etc. due to neutralization, salt corrosion, It means that the character can not perform and the character is degraded.

The effect of carbon dioxide and acid rain in the air in the general environment, the long life of the structure in the long term, and the sulfurous acid component in the automobile exhaust gas such as the underground roadway promote the neutralization of the structure to cause discoloration, peeling phenomenon, , The chemical corrosion phenomenon due to the fusing agent occurs, thereby decreasing the durability of the structure and increasing the maintenance cost. In particular, the neutralization of road related structures such as underground roads, tunnels, bridges, and railway structures is in serious condition. In the case of treatment plants for water treatment plant drainage and sewage end treatment plant, when repairing a structure with a long life and neutralizing the surface, if an antifoaming agent is applied after repairing the section with repair mortar, air pocket, The construction can not be carried out due to peeling or peeling of the resin. In order to solve this problem, it is not necessary to use a coating agent by providing a collar to the mortar, which can solve the problem of the construction.

On the other hand, cracks in concrete due to deterioration factors such as neutralization, salinity, and East Sea, etc. of concrete structures, in particular, lower slabs of bridges, piers, central separation walls of highways, roadway culverts, The compressive strength of the concrete and the tensile strength of the reinforcing bar are gradually lowered, and the exposed concrete through the cracks is degraded and corrosion of the reinforcing steel occurs. If these rebar corrosion phenomena become severe, the concrete structure may eventually collapse.

Korea Patent Registration No. 10-0772621

The problem to be solved by the present invention is to provide a high strength concrete which is excellent in strength and durability, especially in neutralization resistance, acid resistance and salt resistance, and can be used for bridges, sewer culverts, neutralized underground roads and restored tunnels , The finishing work of concrete piers of railway bridges, the finishing work of newly constructed concrete bridges, the concrete finishing works outside of buildings, the prevention of neutralization of all concrete structures such as underground parking lots, water treatment plants and sewage treatment plant constructions, and enhancement of durability And can be used for improving the visibility. By using the automatic equipment, it is possible to achieve the convenience of construction, economical efficiency by shortening the space and labor cost, and maintaining the excellent construction quality, thereby remarkably reducing the maintenance cost And a dolomite excellent in strength, abrasion resistance and fire resistance The present invention provides a color cement mortar composition for repairing concrete structures and a method for repairing concrete structures using the same, which is excellent in strength, abrasion resistance, surface smoothness and fire resistance by using fine aggregate mixed therein.

The present invention relates to a polymer composition comprising 5-70 wt% of an inorganic binder, 25-85 wt% of a fine aggregate, 0.01-20 wt% of a polymer admixture, and 0.1-20 wt% of water, wherein the polymer admixture comprises 50-99 wt% 0.1 to 20% by weight of polymethylmethacrylate, 0.1 to 20% by weight of silicate resin and 0.1 to 20% by weight of silane resin, wherein the inorganic binder comprises 20 to 90% by weight of white cement, 5 to 60 1 to 20 wt% of silica powder, 1 to 20 wt% of anhydrous gypsum, 1 to 30 wt% of calcium or magnesium-based sulfoaluminate, 0.1 to 20 wt% of alumina cement, 0.01 to 10 wt% Wherein the fine aggregate comprises from 45 to 98% by weight of quartz sandstone white silica, from 1 to 30% by weight of granular silica sand, and from 10 to 30% by weight of silica sand, A concrete structure comprising 1 to 54% by weight of dolomite It provides an acceptable color of cement mortar composition.

The polymeric admixture may further comprise 0.01 to 10% by weight of a mixture of polyacrylonitrile and methyl cellulose mixed in a ratio of 0.1 to 0.8: 0.2 to 0.9 by weight.

The polymeric admixture may further comprise 0.01 to 20% by weight of ethylene vinyl acetate.

The polymer-based admixture may further comprise 0.01 to 20% by weight of a styrene-acrylic ester.

The inorganic binder may further include 0.01 to 10% by weight of titanium oxide.

The inorganic binder may further contain 0.01 to 10% by weight of a fiber reinforcing agent, and the fiber reinforcing agent may use at least one fiber selected from nylon, polyethylene and polypropylene.

The inorganic pigment may be at least one selected from the group consisting of red iron oxide, yellow iron oxide, chromium oxide (CrO ₃ ), purple iron oxide and black iron oxide.

According to another aspect of the present invention, there is provided a method for repairing a concrete structure, comprising the steps of: chipping impurities and latences of a concrete structure with a hand chipping machine to form micro voids; priming a site where micro voids are formed; A step of repairing a section by applying a color cement mortar composition, and a step of surface finishing the recovered section.

The present invention also provides a method of treating a concrete structure, comprising the steps of: removing impurities, lettans or deteriorated parts of a concrete structure with a hand water jet or high pressure water washing machine; priming the removed part; A step of repairing the cross section by applying a cement mortar composition to the top of the composition, and a step of repairing the cross section by applying the above-mentioned cross-section repairing polymer cement mortar to the upper part of the composition by applying a color cement mortar composition for repairing the concrete structure, And surface finishing the resultant.

The primer treatment may use at least one material selected from the group consisting of styrene-butadiene latex, polyacrylic ester, ethylvinyl acetate, methyl methacrylate, silane-based compound and the polymer-based admixture.

The surface finishing material may further include a step of applying a surface finishing material to improve visibility, stain resistance and durability after the surface finishing step. The surface finishing material may include styrene-butadiene latex, polyacrylic ester, ethylvinylacetate, methyl methacrylate , A silane-based compound, a silicate-based inorganic compound, and the polymer-based admixture may be used.

The cement mortar composition for repairing a section may comprise 5 to 70% by weight of an inorganic binder, 25 to 85% by weight of a fine aggregate, 0.01 to 20% by weight of a polymer admixture and 0.1 to 20% by weight of water, 20 to 86 wt% of Portland cement, 10 to 60 wt% of blast furnace slag powder, 1 to 20 wt% of silica powder, 1 to 20 wt% of anhydrous gypsum, 1 to 15 wt% of calcium or magnesium- 10 to 10% by weight of zinc oxide, 0.01 to 10% by weight of bentonite, and 0.01 to 10% by weight of alumina silicate based husk ash. The fine aggregate may be granular silicate silicate 45 to 98 % Of bottom ash, 1 to 30 wt.% Of bottom ash and 1 to 54 wt.% Of dolomite, wherein the polymeric admixture comprises 50 to 99 wt.% Styrene-butadiene, 0.1 to 20 wt.% Methyl polymethacrylate, 0.1 to 20% by weight and silane resin 0. 1 to 20% by weight.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide an inorganic binder which is excellent in strength, anticorrosive property, acid resistance, durability, visibility and antifouling property and a polymer type admixture excellent in fluidity, elasticity, adhesive force, acid resistance, alkali resistance, neutralization resistance, water resistance, strength and durability It has an effect of greatly improving fluidity, elasticity, adhesive force, acid resistance, salt resistance, neutralization resistance, water resistance, anticorrosiveness, visibility, antifouling property, strength and durability.

Further, by using a fine aggregate containing dolomite excellent in strength, abrasion resistance, and fire resistance, it is excellent in strength, abrasion resistance, surface smoothness and fire resistance.

In addition, by implementing various colors with inorganic pigments, it is possible to reduce the power consumption by improving the brightness of the illumination in the dark place such as underground roadway, to express the color on the structure, and to make the landscape beautiful, There is an advantage.

The color cement mortar composition for repairing concrete structures of the present invention is excellent in strength and durability, especially in neutralization resistance, acid resistance and salt resistance, and can be used for bridging, sewage cessation, neutralized underground roadway, All of the concrete structures such as the repair work on the section of the damaged highway structure, the finishing work of the concrete pier of the railway bridge, the finishing work of the newly constructed concrete bridge, the concrete finishing work outside the building, the underground parking lot, the water treatment plant, And it can be used for the prevention of neutralization and enhancement of durability, and it is possible to reduce the maintenance cost by remarkably reducing construction cost and labor cost, Effect can be obtained.

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.

A color cement mortar composition for repairing concrete structures according to a preferred embodiment of the present invention comprises 5 to 70% by weight of an inorganic binder containing an inorganic pigment, 25 to 85% by weight of a fine aggregate, 0.01 to 20% by weight of a polymeric admixture, 20% by weight.

The polymer-based admixture is used for improving pot life, workability, fluidity, elasticity, adhesion, acid resistance, salt resistance, neutralization resistance, water resistance, strength, durability and the like. Butadiene, methyl polymethacrylate for improving acid resistance and alkali resistance, silicate resin for improving concrete anti-neutralization and ultraviolet shielding effect, and silane resin for improving water resistance, surface strength and durability. The polymer-based admixture preferably contains 50 to 99% by weight of styrene-butadiene, 0.1 to 20% by weight of polymethyl methacrylate, 0.1 to 20% by weight of silicate resin, and 0.1 to 20% by weight of silane resin.

The polymeric admixture is preferably contained in the color cement mortar composition for repairing concrete structures in an amount of 0.01 to 20% by weight. If the content of the polymeric admixture exceeds 20% by weight, the viscosity is lowered and the material separation is likely to occur, and the hydration reaction may be delayed to lower the early compression strength development and reduce the price competitiveness. If the content of the polymeric admixture is less than 0.01% by weight, the effect of improving the pot life, workability, fluidity, elasticity, adhesion, acid resistance, flame retardancy, neutralization resistance, water resistance, strength and durability may be small.

The styrene-butadiene is used to improve strength, adhesion and durability. If the content of styrene-butadiene is less than 50% by weight, the effect of improving the bonding strength, adhesion and durability of inorganic materials may be insufficient. On the other hand, If the content of styrene-butadiene exceeds 99% by weight, it may be difficult to expect further improvement in adhesion and durability.

The polymethylmethacrylate is used to improve the workability and ductility by lowering the viscosity of the color cement mortar composition for repairing concrete structures. In addition, the polymethyl methacrylate is excellent in acid resistance and alkali resistance and has an effect of improving the strength. The methyl polymethacrylate is preferably contained in the polymer admixture in an amount of 0.1 to 20% by weight. If the content of the polymethyl methacrylate exceeds 20% by weight, the performance of the color cement mortar composition for repairing concrete structures is improved However, if the content of methyl polymethacrylate is less than 0.1% by weight, the effect of improving ductility, acid resistance, alkali resistance and strength may be weak.

The silicate resin is used to improve the effect of preventing concrete neutralization and ultraviolet ray shielding. The silicate resin is preferably contained in the polymeric admixture in an amount of 0.1 to 20 wt%. If the content of the silicate resin exceeds 20 wt%, the performance may be improved but the price competitiveness may be deteriorated. If the content of the silicate resin is 0.1 When the amount is less than 10% by weight, workability is improved, but the effect of preventing neutralization and ultraviolet ray blocking may be weak.

The silane resin is used to improve the water resistance, surface strength and durability of the color cement mortar composition for repairing concrete structures. If the content of the silane resin exceeds 20% by weight, the performance of the color cement mortar composition for repairing the concrete structure may be improved but the price competitiveness may be deteriorated. If the content of the silane resin is less than 0.1% by weight, the effect of improving water resistance, surface strength and durability may be weak.

The polymeric admixture may contain 0.01 to 10% by weight of a blend of polyacrylonitrile and methyl cellulose mixed in a ratio of 0.1 to 0.8: 0.2 to 0.9 in weight ratio to impart a cohesive force and material separation prevention property to form a stable concrete structure. . The mixture of polyacrylonitrile and methylcellulose can contribute to formation of a stable concrete structure by imparting fluidity, cohesive force and material separation prevention property, and additionally, by excellent cohesive force, prevention of water pollution, protection of reinforcing bars of concrete structures It can have a side effect. The mixture of polyacrylonitrile and methylcellulose is preferably contained in the polymeric admixture in an amount of 0.01 to 10 wt%. If the content of the mixture of polyacrylonitrile and methylcellulose exceeds 10% by weight, the viscosity may be increased and the workability may be lowered. If the content of the mixture of polyacrylonitrile and methylcellulose is less than 0.01% by weight, the workability is improved The effect of imparting fluidity, cohesive force and material separation prevention property may be weak.

In addition, the polymeric admixture may further comprise ethylene vinyl acetate. The ethylene vinyl acetate is used for improving the adhesion, durability and heat resistance of a color cement mortar composition for repairing concrete structures. The ethylene vinyl acetate is preferably contained in an amount of 0.01 to 20% by weight in the polymer-based admixture. If the ethylene vinyl acetate content exceeds 20% by weight, the performance of the color cement mortar composition for repairing concrete structures may be improved but the price competitiveness may be deteriorated. If the ethylene vinyl acetate content is less than 0.1% by weight, The workability of the cement mortar composition is improved, but the effect of improving the adhesion, durability and heat resistance may be weak.

In addition, the polymer-based admixture may further include a styrene-acrylic ester. The styrene-acrylic ester is used for improving the acid resistance and alkali resistance of the color cement mortar composition for repairing concrete structures. The styrene-acrylic ester is preferably contained in the polymer-based admixture in an amount of 0.01 to 20 wt%. If the content of the styrene-acrylic ester exceeds 20% by weight, the performance of the color cement mortar composition for repairing concrete structures may be improved but the price competitiveness may be deteriorated. If the styrene-acrylic ester content is less than 0.01% by weight, The workability of the color cement mortar composition is improved but the effect of improving acid resistance and alkali resistance may be weak.

In addition, the polymer-based admixture may further include a defoaming agent for removing bubbles in the polymer-based admixture to increase strength and durability. The antifoaming agent is used to remove bubbles in the polymer-based admixture to increase strength and durability. When the antifoaming agent is added to the polymer-based admixture, air entraining effect is imparted to improve workability and pot life. The antifoaming agent is preferably contained in the polymer-based admixture in an amount of 0.01 to 5% by weight. Examples of the defoaming agent include alcohol defoaming agents, silicone defoaming agents, fatty acid defoaming agents, oil defoaming agents, ester defoaming agents and oxyalkylene defoaming agents. 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 agents include kerosene, animal and plant oil, and castor oil. Examples of the ester type antifoaming agents include solitol trioleate, glycerol monoricinolate, and the like. Examples of the oxyalkylene antifoaming agents include polyoxyalkylene, acetylene ethers, polyoxyalkylene diisocyanate esters, and polyoxyalkylene alkylamines. Examples of the alcohol-based defoaming agent include glycol.

In addition, the polymer-based admixture may further include a water reducing agent for reducing the water-cement ratio to improve strength and durability. The water reducing agent is used to improve the strength and durability by reducing the water-cement ratio and to secure the fluidity of the polymer-based admixture. The water-cement ratio is reduced when the water reducing agent is added to the polymer admixture. The water reducing agent is preferably contained in the polymer-based admixture in an amount of 0.01 to 5 wt%. The water reducing agent may be a polycarbonate-based, melamine-based or naphthalene-based water reducing agent. However, the naphthalene-based and melamine-based compounds may lower the strength of the composition as compared with the polycarbonate-based ones and may reduce workability and pot life, And a polycarboxylic acid-based water reducing agent which does not lower the pot life.

The environmentally friendly inorganic binder having excellent strength and durability is selected from the group consisting of white cement, blast furnace slag powder, silica powder, anhydrous gypsum, calcium or magnesium sulphoaluminate, alumina cement, zinc oxide, bentonite, alumina silicate- ) And an inorganic pigment. Wherein the inorganic binder comprises 20 to 90 wt% of white cement, 5 to 60 wt% of blast furnace slag powder, 1 to 20 wt% of silica powder, 1 to 20 wt% of anhydrous gypsum, 1 to 30 wt% of calcium or magnesium- Wherein the aluminosilicate-based cementitious composition comprises 0.1-20% by weight of alumina cement, 0.01-10% by weight of zinc oxide, 0.01-10% by weight of bentonite, 0.01-10% by weight of alumina silicate based husk ash and 0.01-10% .

The white cement is preferably a cement which meets the KS standard. The white cement is preferably contained in the inorganic binder in an amount of 20 to 90% by weight. If the content of the white cement exceeds 90% by weight, improvement in chroma and workability may be improved, but strength and durability may be deteriorated. If the content of the white cement is less than 20% by weight, the visibility may be lowered.

The blast furnace slag powder is used for improving latent hydraulic characteristics, long-term strength development and durability. When the weight ratio of the blast furnace slag powder is increased, the early strength is lowered, but the long-term strength development and durability are increased. The blast furnace slag powder is preferably contained in the inorganic binder in an amount of 5 to 60% by weight. If the content of the blast furnace slag powder exceeds 60% by weight, the initial strength development may be deteriorated. If the content of the blast furnace slag powder is less than 5% by weight, the effect of improving long-term strength and durability may be weak.

The silica powder is used for improving latent hydraulic characteristics, long-term strength development and durability. When the weight ratio of the silica powder is increased, the early strength is lowered, but the long-term strength development and durability are increased. The silica powder is preferably contained in the inorganic binder in an amount of 1 to 20% by weight. If the content of the silica powder exceeds 20 wt%, the initial strength development may be deteriorated. If the content of the silica powder is less than 1 wt%, the effect of improving the long-term strength and durability may be weak.

The anhydrous gypsum (CaSO ₄ ) reacts with the components in the cement, in particular C ₃ A ( ₃ CaO.Al ₂ O ₃ ), to initially produce ettringite (AFt phase, C ₃ A · ₃ CaSO ₄ · 32 H ₂ O) The produced etrinzate decreases in its amount as the hydration proceeds, or a part thereof is transferred to monosulfate (AFm phase, C ₃ A · CaSO ₄ · 12H ₂ O). When a large amount of anhydrous gypsum is added as in the present invention, etrinzite is sufficiently generated from the beginning to densify the structure of the cement, thereby increasing penetration resistance to chloride ions in the early age. In addition, in the case of general cement, the produced etlin zeite is mainly present at the initial stage. However, since the inorganic binder of the present invention is sufficiently added with the amount of gypsum, the etlin zeite is partially present in the long- Zites are also generated continuously. The nitrite produced in this way increases the penetration resistance to chlorides even in the long term by densely filling the pores in the concrete structure. The anhydrous gypsum is preferably contained in the inorganic binder in an amount of 1 to 20 wt%. If the content of the gypsum anhydride exceeds 20% by weight, the initial strength development effect is excellent but the durability may be lowered. If the content of the gypsum anhydrite is less than 1% by weight, the initial strength development may be delayed.

The calcium or magnesium-based sulfoaluminate is an inorganic fastidious mineral material which is added to increase hydration reactivity and inhibit cracking. When calcium or magnesium-based sulfoaluminate is contacted with water, it reacts with water in an instant to generate an ettringite hydrate, When mixed with cement, excellent compressive strength can be obtained in a short time. The calcium or magnesium-based sulfoaluminate is meant to include calcium sulfoaluminate or magnesium sulfoaluminate. The calcium or magnesium-based sulfoaluminate is preferably contained in the inorganic binder in an amount of 1 to 30% by weight. When the content of the calcium or magnesium-based sulfoaluminate is increased, the rapid curing property is exhibited. When the content of the calcium or magnesium-based sulfoaluminate is less than 1% by weight, the strength improvement and the crack generation inhibiting effect may be insignificant. Or magnesium-based sulfoaluminate is more than 30% by weight, good physical properties can be obtained due to quick curing characteristics, but it is not economical because the production cost is high.

The alumina cement is used for improving chemical resistance, particularly acid resistance. The alumina cement is preferably contained in the inorganic binder in an amount of 0.1 to 20% by weight. If the content of the alumina cement is less than 0.1% by weight, the effect of improving the chemical resistance and acid resistance may be insignificant. If the content of the alumina cement is more than 20% by weight Good physical properties can be obtained due to fast curing characteristics, but it is not economical due to high production cost.

The zinc oxide is used for antiseptic and antimicrobial functions. The zinc oxide is preferably contained in the inorganic binder in an amount of 0.01 to 10 wt%. When the weight ratio of zinc oxide is increased, the antifouling performance is exhibited. When the content of zinc oxide is less than 0.01 wt%, the effect of preservation, antibacterial and antifouling performance may be weak. When the content of zinc oxide is more than 10 wt% The strength development can be lowered and the production cost is increased, which is not economical.

The bentonite acts as a sorbent material as a porous inorganic material. The bentonite is preferably contained in the inorganic binder in an amount of 0.01 to 10 wt%. When the content of the bentonite is less than 0.01% by weight, the viscosity improvement and the adsorption effect may be weak. When the content of the bentonite is more than 10% by weight, the workability And the production cost is high, which is not economical.

The alumina silicate based senosphere powder is used for improving latent hydraulic characteristics, long-term strength development and durability. When the weight ratio of the alumina silicate based SenoSpare powder is increased, the early strength is lowered, but the long-term strength development and durability are increased. The alumina silicate based senespear powder is preferably contained in the inorganic binder in an amount of 0.01 to 10 wt%.

The inorganic pigments are used to realize various colors. The inorganic pigment is preferably contained in the inorganic binder in an amount of 0.01 to 10 wt%. The inorganic pigment may be at least one selected from the group consisting of red iron oxide, yellow iron oxide, chromium oxide (CrO ₃ ), purple iron oxide and black iron oxide (carbon black), whereby red, green, yellow, black, Various colors can be implemented.

The inorganic binder may further include 0.01 to 10% by weight of titanium oxide. The titanium oxide can be used for antiseptic and antimicrobial functions. The titanium oxide is preferably contained in the inorganic binder in an amount of 0.01 to 10 wt%. When the weight ratio of the titanium oxide is increased, the antifouling performance is exhibited. When the content of the titanium oxide is less than 0.01 wt%, the effect of preservation, antibacterial and antifouling performance may be weak. When the content of the titanium oxide is more than 10 wt% The strength development can be lowered and the production cost is increased, which is not economical.

In addition, the inorganic binder may further include a water reducing agent. The water reducing agent is used to improve the strength and durability by reducing the water-cement ratio of the inorganic binder. The water reducing agent may be a polycarbonate-based, melamine-based or naphthalene-based fluidizing agent. The melamine- or naphthalene-based water reducing agent is less effective in improving the strength and durability than the polycarboxylic acid-based water reducing agent and has a small effect of reducing the water-cement ratio. When mixed with a polymer-based admixture, There are disadvantages. Therefore, the water reducing agent is preferably a polycarboxylic acid-based water reducing agent, and is preferably contained in the inorganic binder in an amount of 0.01 to 2% by weight.

In addition, the inorganic binder may further include a retarder. The retarder can be used to ensure workability for a certain period of time and to delay rapid curing. The retarder is preferably contained in the inorganic binder in an amount of 0.01 to 2% 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 inorganic binder may further include a fiber reinforcing agent. The fiber reinforcing agent is used for reducing toughness, drying shrinkage cracking, and improving adhesion strength. The fiber reinforcing agent is preferably contained in the inorganic binder in an amount of 0.01 to 10 wt%. It is preferable that at least one fiber selected from nylon, polyethylene and polypropylene is used as the fiber reinforcing agent.

The fine aggregate may include quartz sandy white sand, granite sand, and dolomite. The fine aggregate preferably contains 45 to 98% by weight of quartz sandy white silica, 1 to 30% by weight of granite silica, and 1 to 54% by weight of dolomite. In general, aggregate is classified into fine aggregate and coarse aggregate. Coarse aggregate means aggregate exceeding 5 mm in diameter. Hereinafter, fine aggregate refers to aggregate having particle size of 5 mm or less in comparison with coarse aggregate.

The quartz sandy white squamish is used for improving visibility and saturation, and preferably has a particle size of from 4 to 8 (0.05 to 2.0 mm). If the particle size of quartz sandy white silica is larger than this range, the fluidity of the color cement mortar composition for repairing concrete structures may be lowered. If the particle size is smaller than that, the workability of the color cement mortar composition for repairing concrete structures may be lowered. It is preferable that the quartz sandy silicate sand is contained in the fine aggregate in an amount of 45 to 98 wt%. If the content of the quartz rocky white silica is more than 98 wt%, the visibility and the chroma are improved but the price competitiveness is decreased. If the content of the quartz rock white silica is less than 45 wt%, the effect of improving the visibility and the saturation may be weak.

Preferably, the granular silica sand has a particle size of from 4 to 8 (0.05 to 2.0 mm). If the particle size of the granite silica sand is larger than this, the fluidity of the color cement mortar composition for repairing the concrete structure may be lowered, and if it is smaller than this, the workability of the color cement mortar composition for repairing the concrete structure may be lowered. The granular silica sand is preferably contained in the fine aggregate in an amount of 1 to 30% by weight.

The dolomite has a specific gravity of 2.9 and a hardness of about 4 and is excellent in strength, abrasion resistance and fire resistance, and is used to improve strength, abrasion resistance and fire resistance in a color cement mortar composition for repairing concrete structures. The dolomite is preferably contained in the fine aggregate in an amount of 1 to 54% by weight.

The cement mortar composition for repairing a section according to a preferred embodiment of the present invention comprises 5 to 70% by weight of an inorganic binder, 25 to 85% by weight of a fine aggregate, 0.01 to 20% by weight of a polymeric admixture and 0.1 to 20% by weight of water.

The inorganic binder is usually 20 to 86 wt% of Portland cement, 10 to 60 wt% of blast furnace slag powder, 1 to 20 wt% of silica powder, 1 to 20 wt% of anhydrous gypsum, 1 to 15 wt% of calcium or magnesium- 0.1-10% by weight of alumina cement, 0.01-10% by weight of zinc oxide, 0.01-10% by weight of bentonite and 0.01-10% by weight of alumina silicate based husk ash powder.

The inorganic binder may further include 0.01 to 10% by weight of titanium oxide.

In addition, the inorganic binder may further include 0.01 to 2% by weight of a water reducing agent. As the water reducing agent, a polycarboxylic acid type, melamine type or naphthalene type water reducing agent may be used.

The inorganic binder may further include 0.01 to 2% by weight of a retarder. 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.

In addition, the inorganic binder may further include 0.01 to 10% by weight of a fiber reinforcing agent. It is preferable that at least one fiber selected from nylon, polyethylene and polypropylene is used as the fiber reinforcing agent.

In addition, the inorganic binder may further include 0.01 to 10% by weight of an inorganic pigment. The inorganic pigment may be at least one selected from the group consisting of red iron oxide, yellow iron oxide, chromium oxide (CrO ₃ ), purple iron oxide and black iron oxide (carbon black).

The fine aggregate may include 45 to 98 wt% of granite silica, 1 to 30 wt% of bottom ash, and 1 to 54 wt% of dolomite.

The polymeric admixture may include 50 to 99 wt% of styrene-butadiene, 0.1 to 20 wt% of polymethyl methacrylate, 0.1 to 20 wt% of silicate resin, and 0.1 to 20 wt% of silane resin.

The polymeric admixture may contain 0.01 to 10% by weight of a blend of polyacrylonitrile and methyl cellulose mixed in a ratio of 0.1 to 0.8: 0.2 to 0.9 in weight ratio to impart a cohesive force and material separation prevention property to form a stable concrete structure. .

In addition, the polymeric admixture may further include 0.01 to 20% by weight of ethylene vinyl acetate.

In addition, the polymer-based admixture may further include 0.01 to 20% by weight of a styrene-acrylic ester.

In addition, the polymer-based admixture may further include 0.01 to 5% by weight of an antifoaming agent for removing bubbles in the polymer-based admixture to increase strength and durability. Examples of the defoaming agent include alcohol defoaming agents, silicone defoaming agents, fatty acid defoaming agents, oil defoaming agents, ester defoaming agents and oxyalkylene defoaming agents.

In addition, the polymer-based admixture may further include 0.01 to 5% by weight of a water reducing agent for reducing the water-cement ratio to improve the strength and durability. As the water reducing agent, a polycarboxylic acid type, melamine type or naphthalene type water reducing agent may be used.

Hereinafter, a color cement mortar composition for repairing a concrete structure and a method for producing a cement mortar composition for repairing a section according to a preferred embodiment of the present invention will be described.

The color cement mortar composition for repairing concrete structures according to a preferred embodiment of the present invention is prepared by premixing 5 to 70% by weight of the inorganic binder and 25 to 85% by weight of fine aggregate in a forced mixer, By weight and water in an amount of 0.1 to 20% by weight, and mixing the mixture with a forced mixer or a continuous mixer for a predetermined time (for example, 1 to 10 minutes).

The cement mortar composition for repairing an end face according to a preferred embodiment of the present invention is prepared by premixing 5 to 70% by weight of the inorganic binder and 25 to 85% by weight of the fine aggregate in a forced mixer, And water in an amount of 0.1 to 20% by weight, and mixing the mixture with a forced mixer or a continuous mixer for a predetermined time (for example, 1 to 10 minutes).

Hereinafter, a method of repairing a concrete structure using the above-described color cement mortar composition for repairing concrete structures and a cement mortar composition for repairing an area is described. Hereinafter, the concrete structure refers to concrete structures such as bridges, sewage culverts, underground roads, underground parking lots, water purification plants, sewage treatment plants, neutralized tunnels, chemical plants, food factories, housing floors and related structures, marine concrete structures, It is used to mean a structure made of concrete as a structure of a sewer, a road surface, a bridge bridge, a concrete slab of a bridge, a bridge expansion joint, a bridge, a median bridge of a highway.

According to another aspect of the present invention, there is provided a method of repairing a concrete structure, comprising the steps of: forming a microvoid by chipping an impurity and a latence of a concrete structure with a hand chipping machine; applying a primer to a site where microvoids are formed; Applying a color cement mortar composition for repairing the concrete structure to the primer-treated upper portion to repair the cross-section, and finishing the surface of the recovered cross-section. At this time, after the surface finishing step, it may further include coating the surface finishing material as necessary to improve visibility, antifouling property and durability.

The primer treatment means that the color cement mortar composition for repairing the concrete structure is applied to the concrete structure. The primer treatment may be performed using at least one material selected from the group consisting of styrene-butadiene latex, polyacrylic ester, ethylvinyl acetate, methyl methacrylate, silane-based compound and the polymer-based admixture, but is not limited thereto.

The surface finishing material may be at least one material selected from the group consisting of styrene-butadiene latex, polyacrylic ester, ethylvinylacetate, methyl methacrylate, silane-based compound, silicate-based inorganic compound and polymer-based admixture, no.

According to another preferred embodiment of the present invention, there is provided a method of repairing concrete structures, comprising the steps of removing impurities, rungs, deteriorated parts, etc. of concrete structures with a hand water jet or high pressure water washing machine, A step of repairing the cross-section of the polymeric cement mortar composition for repairing the cross-section by applying the cross-section repairing polymeric cement mortar composition to the top of the resultant treated with the primer, And a step of finishing the surface of the finished product having the cross section.

The deteriorated portion may be removed to a lower portion of the reinforcing bar, and the exposed reinforcing bar may be rustproofed before the primer treatment. When the hand water jet or high pressure water washing machine is used, the reinforcing bars of the concrete structure are not exposed in the normal case, but the reinforcing bars may be exposed in the deteriorated areas when the deterioration is severe. It is desirable to prevent corrosion.

The primer treatment means that the polymer cement mortar composition for maintenance of the section is coated with a substance that facilitates adhesion to the concrete structure. The primer treatment may be performed using at least one selected from the group consisting of styrene-butadiene latex, polyacrylic ester, ethyl vinyl acetate, methyl methacrylate, silane-based compounds and the polymer-based admixture.

Hereinafter, embodiments of a color cement mortar composition for repairing concrete structures and a cement mortar composition for repairing a section according to the present invention will be more specifically shown, and the present invention is not limited by the following embodiments.

≪ Example 1 >

1-1. Cement mortar composition for maintenance of section

45% by weight of inorganic binder and 45% by weight of fine aggregate were premixed in a forced mixer, and then 6% by weight of a polymer admixture and 4% by weight of water were added and stirred for 2 minutes by a forced mixer to prepare a cement mortar composition for repairing a section .

At this time, the inorganic binder is usually 35 weight% of Portland cement, 15 weight% of blast furnace slag powder, 6 weight% of silica powder, 6 weight% of anhydrous gypsum, 20 weight% of calcium sulfoaluminate, 10 weight% of alumina cement, %, Bentonite 2% by weight, alumina silicate based senosphere powder 3% by weight, delaying agent 0.3% by weight, water reducing agent 0.2% by weight and fiber reinforcing agent 0.5% by weight. As the retarder, citric acid was used. A polycarboxylic acid-based water reducing agent was used as the water reducing agent. Nylon fiber was used as the fiber reinforcing agent.

The fine aggregate was used in a mixture of 80% by weight of granite silica, 10% by weight of bottom ash and 10% by weight of dolomite.

The polymer admixture was prepared by mixing 95% by weight of styrene-butadiene, 2% by weight of polymethylmethacrylate, 1% by weight of silicate resin, 1% by weight of silane resin, 0.5% by weight of defoamer and 0.5% by weight of water reducing agent. The defoamer was a silicone defoamer. A polycarboxylic acid-based water reducing agent was used as the water reducing agent.

1-2. Color cement mortar composition for repairing concrete structures

45% by weight of inorganic binder and 45% by weight of fine aggregate were premixed in a forced mixer, and then 6% by weight of a polymer admixture and 4% by weight of water were added and stirred for 2 minutes by a forced mixer to prepare a cement mortar composition for repairing a section .

The inorganic binder is composed of 50 wt% of white cement, 10 wt% of blast furnace slag powder, 5 wt% of silica powder, 5 wt% of anhydrous gypsum, 15 wt% of calcium sulfoaluminate, 5 wt% of alumina cement, 2 wt% bentonite, 3 wt% alumina silicate based senospear powder, 0.3 wt% retarder, 0.2 wt% water reducing agent, and 2.5 wt% inorganic pigment were mixed and used. As the retarder, citric acid was used. A polycarboxylic acid-based water reducing agent was used as the water reducing agent. Red iron oxide was used as the inorganic pigment.

The fine aggregate was prepared by mixing 80 wt% of quartz sandy white silica sand, 10 wt% of granite silica sand, and 10 wt% of dolomite.

The polymeric admixture was prepared by mixing 95 wt% of styrene-butadiene, 1 wt% of polymethylmethacrylate, 1 wt% of silicate resin, 1 wt% of silane resin, 0.5 wt% of polyacrylonitrile and methylcellulose mixture, 0.5 wt 0.5% by weight of a styrene-acrylic ester, 0.2% by weight of a defoaming agent, and 0.3% by weight of a water reducing agent. The defoamer was a silicone defoamer. A polycarboxylic acid-based water reducing agent was used as the water reducing agent. The mixture of polyacrylonitrile and methylcellulose used was a mixture of polyacrylonitrile and methylcellulose in a weight ratio of 0.2: 0.8.

≪ Example 2 >

2-1. Cement mortar composition for maintenance of section

45% by weight of inorganic binder and 45% by weight of fine aggregate were premixed in a forced mixer, and then 6% by weight of a polymer admixture and 4% by weight of water were added and stirred for 2 minutes by a forced mixer to prepare a cement mortar composition for repairing a section .

At this time, the inorganic binder is usually 35 weight% of Portland cement, 15 weight% of blast furnace slag powder, 6 weight% of silica powder, 6 weight% of anhydrous gypsum, 20 weight% of calcium sulfoaluminate, 10 weight% of alumina cement, %, Bentonite 2% by weight, alumina silicate based senosphere powder 3% by weight, delaying agent 0.3% by weight, water reducing agent 0.2% by weight and fiber reinforcing agent 0.5% by weight. As the retarder, citric acid was used. A polycarboxylic acid-based water reducing agent was used as the water reducing agent. Nylon fiber was used as the fiber reinforcing agent.

The fine aggregate was used in a mixture of 80% by weight of granite silica, 10% by weight of bottom ash and 10% by weight of dolomite.

The polymeric admixture was prepared by mixing 90 wt% of styrene-butadiene, 4 wt% of polymethyl methacrylate, 2.5 wt% of silicate resin, 2.5 wt% of silane resin, 0.5 wt% of defoamer, and 0.5 wt% of water reducing agent. The defoamer was a silicone defoamer. A polycarboxylic acid-based water reducing agent was used as the water reducing agent.

2-2. Color cement mortar composition for repairing concrete structures

45% by weight of inorganic binder and 45% by weight of fine aggregate were premixed in a forced mixer, and then 6% by weight of a polymer admixture and 4% by weight of water were added and stirred for 2 minutes by a forced mixer to prepare a cement mortar composition for repairing a section .

The inorganic binder is composed of 50 wt% of white cement, 10 wt% of blast furnace slag powder, 5 wt% of silica powder, 5 wt% of anhydrous gypsum, 15 wt% of calcium sulfoaluminate, 5 wt% of alumina cement, 2 wt% bentonite, 3 wt% alumina silicate based senospear powder, 0.3 wt% retarder, 0.2 wt% water reducing agent, and 2.5 wt% inorganic pigment were mixed and used. As the retarder, citric acid was used. A polycarboxylic acid-based water reducing agent was used as the water reducing agent. Red iron oxide was used as the inorganic pigment.

The fine aggregate was prepared by mixing 80 wt% of quartz sandy white silica sand, 10 wt% of granite silica sand, and 10 wt% of dolomite.

The polymeric admixture was prepared by mixing 90 wt% of styrene-butadiene, 2.5 wt% of polymethylmethacrylate, 2 wt% of silicate resin, 2 wt% of silane resin, 1 wt% of polyacrylonitrile and methylcellulose mixture, 1% by weight of a styrene-acrylic ester, 0.2% by weight of a defoaming agent, and 0.3% by weight of a water reducing agent. The defoamer was a silicone defoamer. A polycarboxylic acid-based water reducing agent was used as the water reducing agent. The mixture of polyacrylonitrile and methylcellulose used was a mixture of polyacrylonitrile and methylcellulose in a weight ratio of 0.2: 0.8.

≪ Example 3 >

3-1. Cement mortar composition for maintenance of section

45% by weight of inorganic binder and 45% by weight of fine aggregate were premixed in a forced mixer, and then 6% by weight of a polymer admixture and 4% by weight of water were added and stirred for 2 minutes by a forced mixer to prepare a cement mortar composition for repairing a section .

At this time, the inorganic binder is usually 35 weight% of Portland cement, 15 weight% of blast furnace slag powder, 6 weight% of silica powder, 6 weight% of anhydrous gypsum, 20 weight% of calcium sulfoaluminate, 10 weight% of alumina cement, %, Bentonite 2% by weight, alumina silicate based senosphere powder 3% by weight, delaying agent 0.3% by weight, water reducing agent 0.2% by weight and fiber reinforcing agent 0.5% by weight. As the retarder, citric acid was used. A polycarboxylic acid-based water reducing agent was used as the water reducing agent. Nylon fiber was used as the fiber reinforcing agent.

The fine aggregate was used in a mixture of 80% by weight of granite silica, 10% by weight of bottom ash and 10% by weight of dolomite.

The polymeric admixture was prepared by mixing 85% by weight of styrene-butadiene, 6% by weight of polymethylmethacrylate, 4% by weight of silicate resin, 4% by weight of silane resin, 0.5% by weight of defoamer and 0.5% by weight of water reducing agent. The defoamer was a silicone defoamer. A polycarboxylic acid-based water reducing agent was used as the water reducing agent.

3-2. Color cement mortar composition for repairing concrete structures

45% by weight of inorganic binder and 45% by weight of fine aggregate were premixed in a forced mixer, and then 6% by weight of polymer admixture and 4% by weight of water were added and stirred for 2 minutes with a forced mixer to prepare a cement mortar composition for repairing a section .

The inorganic binder is composed of 50 wt% of white cement, 10 wt% of blast furnace slag powder, 5 wt% of silica powder, 5 wt% of anhydrous gypsum, 15 wt% of calcium sulfoaluminate, 5 wt% of alumina cement, 2 wt% bentonite, 3 wt% alumina silicate based senospear powder, 0.3 wt% retarder, 0.2 wt% water reducing agent, and 2.5 wt% inorganic pigment were mixed and used. As the retarder, citric acid was used. A polycarboxylic acid-based water reducing agent was used as the water reducing agent. Red iron oxide was used as the inorganic pigment.

The fine aggregate was prepared by mixing 80 wt% of quartz sandy white silica sand, 10 wt% of granite silica sand, and 10 wt% of dolomite.

The polymeric admixture comprised 85 wt% styrene-butadiene, 4.0 wt% polymethyl methacrylate, 3 wt% silicate resin, 3 wt% silane resin, 1.5 wt% polyacrylonitrile and methyl cellulose mixture, 1.5 wt% ethylene vinyl acetate 1.5% by weight of styrene-acrylic ester, 0.2% by weight of an antifoamer and 0.3% by weight of a water reducing agent. The defoamer was a silicone defoamer. A polycarboxylic acid-based water reducing agent was used as the water reducing agent. The mixture of polyacrylonitrile and methylcellulose used was a mixture of polyacrylonitrile and methylcellulose in a weight ratio of 0.2: 0.8.

Comparative Examples that can be compared with the embodiments of the present invention are shown in order to more easily grasp the characteristics of the above Examples 1 to 3. Comparative Examples 1 and 2 to be described later are examples of the ordinary cement mortar composition and the polymer cement mortar Lt; / RTI >

≪ Comparative Example 1 &

45% by weight of ordinary Portland cement, 45% by weight of fine aggregate and 10% by weight of water were mixed with a forced mixer to prepare a usual cement mortar composition.

≪ Comparative Example 2 &

45% by weight of white cement and 45% by weight of fine aggregate were premixed by a forced mixer, and then 6% by weight of styrene-butadiene and 4% by weight of water were added and stirred with a forced mixer for 2 minutes to prepare a polymer cement mortar composition.

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 cement mortar composition for repairing a cross-sectional repair cement mortar composition and the cement mortar composition for repairing a concrete structure according to Examples 1 to 3 and the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 were applied to KS F 2405 Test method), and the results are shown in Table 1 below. Bending strength test was carried out by KS F 2408 (Bending strength test method of mortar), Tensile strength test was conducted by KS F 2423 (Tensile strength test method of mortar), JIS A 6916 (Tension adjustment material for finishing paint) And the results are shown in Table 1. The results are shown in Table 1. < tb > < TABLE > In Table 1, '1-1' represents a cement mortar composition for repairing a section according to Example 1, '1-2' represents a color cement mortar composition for repairing a concrete structure according to Example 1, 1 'represents a cement mortar composition for repairing a section according to Example 2,' 2-2 'represents a color cement mortar composition for repairing a concrete structure according to Example 2, and' 3-1 ' '3-2' represents a color cement mortar composition for repairing a concrete structure according to Example 3. FIG.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 1-1 1-2 2-1 2-2 3-1 3-2
burglar
(kgf / cm2) warp 110 100 116 108 122 112 65 99 compression 488 468 502 489 529 505 449 468 Seal 42 38 48 42 53 47 25 39 adhesion 14 14 16 15 17 17 10 12

As shown in Table 1, the flexural, compressive, tensile, and adhesive strengths of the cement mortar composition for repairing a cross-section and the color cement mortar composition for repairing a concrete structure produced according to Examples 1 to 3 were as shown in Comparative Example 1 and Comparative Example 2 < / RTI > of the cement mortar composition.

≪ Test Example 2 &

The cement mortar composition for repairing a cross-section repair cement mortar composition and the color cement mortar composition for repairing a concrete structure produced according to Examples 1 to 3 and the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 were evaluated as KS F 2424 Test method), and the results are shown in Table 2 below.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 1-1 1-2 2-1 2-2 3-1 3-2 Dry shrinkage (%) 0.07 0.08 0.05 0.06 0.04 0.045 0.12 0.10

As shown in Table 2 above, the cement mortar composition for repairing a section and the color cement mortar composition for repairing a concrete structure produced according to Examples 1 to 3 were used for the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 It was confirmed that shrinkage reduction effect was reduced by decreasing drying shrinkage.

≪ Test Example 3 >

The cement mortar composition for repairing a cross-sectional repair cement mortar composition and the cement mortar composition for repairing a concrete structure and the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 prepared according to Examples 1 to 3 were evaluated according to JIS A 1171 (polymer cement mortar The test results are shown in Table 3 below. If the water absorption rate is high, impurities or water penetrate into the interior of the concrete, the porosity increases in the interior of the concrete, thereby causing a problem of causing damage to the structure.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 1-1 1-2 2-1 2-2 3-1 3-2 Absorption Rate (%) 0.6 0.62 0.45 0.48 0.33 0.37 1.9 0.9

As shown in the above Table 3, the cement mortar composition for repairing a section and the color cement mortar composition for repairing a concrete structure produced according to Examples 1 to 3 were the same as those of the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 The absorption rate was low.

<Test Example 4>

The cement mortar composition for repairing a cross-sectional repair cement mortar composition and the cement mortar composition for repairing a concrete structure and the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 prepared according to Examples 1 to 3 were evaluated according to JIS A 1171 (polymer cement mortar Test method), and the results are shown in Table 4 below.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 1-1 1-2 2-1 2-2 3-1 3-2 Chloride ion penetration depth (mm) 0.8 0.82 0.68 0.71 0.55 0.59 1.9 1.0

As shown in Table 4, the cement mortar composition for repairing a section and the color cement mortar composition for repairing a concrete structure produced according to Examples 1 to 3 were the same as those of the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 It was confirmed that chloride ion penetration depth was low and resistance to salting was high.

&Lt; Test Example 5 >

The cement mortar composition for repairing a cross-section repair cement mortar composition and the concrete structure repair cement mortar composition prepared according to Examples 1 to 3 and the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 were subjected to chloride ion penetration by KS F 4042 The results are shown in Table 5 below.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 1-1 1-2 2-1 2-2 3-1 3-2 Chloride ion penetration resistance (coulombs) 560 586.8 525.2 535.3 500.5 510.2 1800 820.0

As shown in Table 5, the cement mortar composition for repairing a section and the color cement mortar composition for repairing a concrete structure produced according to Examples 1 to 3 were the same as those of the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 The chloride ion penetration resistance was low and it was confirmed that it was highly resistant to salt attack.

&Lt; Test Example 6 >

The cement mortar composition for repairing a cross-sectional repair cement mortar composition and the cement mortar composition for repairing a concrete structure and the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 prepared according to Examples 1 to 3 were evaluated according to JIS A 1171 (polymer cement mortar Test method) was performed, and the results are shown in Table 6. &lt; tb &gt; &lt; TABLE &gt;

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 1-1 1-2 2-1 2-2 3-1 3-2 Neutralization depth (mm) 0.4 0.45 0.3 0.33 0.2 0.21 1.4 0.8

As shown in the above Table 6, the cement mortar composition for repairing a section and the color cement mortar composition for repairing a concrete structure produced according to Examples 1 to 3 were the same as those of the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 It was confirmed that the depth of neutralization penetration was smaller than that of neutralization.

&Lt; Test Example 7 >

The cement mortar composition for repairing a section of a repairing cement and the cement mortar composition for repairing a concrete structure and the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 were produced according to the Japanese Industrial Standards The test results of the chemical resistance test are shown in Table 7 below by immersing the specimen in an aqueous solution of 2% hydrochloric acid, 5% sulfuric acid and 45% sodium hydroxide in the test solution for 28 days in accordance with the test method of chemical resistance by immersion.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 1-1 1-2 2-1 2-2 3-1 3-2 Weight change rate
(%) Hydrochloric acid -1.7 -1.9 -1.4 -1.5 -1.1 -1.2 -8.0 -2.3 Sulfuric acid -0.2 -0.23 -0.2 -0.22 -0.11 -0.15 -1.8 -0.8 Sodium hydroxide 0.5 0.5 0.8 0.75 1.1 1.0 -0.1 0.2

As shown in Table 7, the cement mortar composition for repairing a cross-section and the color cement mortar composition for repairing concrete structure produced according to Examples 1 to 3 were the same as those of the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 The weight change ratio with respect to the chemical resistance was small and the resistance to chemical resistance was high.

<Test Example 8>

The cement mortar composition for repairing a cross-sectional repair cement mortar composition and the cement mortar composition for repairing a concrete structure prepared according to Examples 1 to 3 and the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 were evaluated by the method defined in KS F 2456 The results of the freeze-thaw resistance test are shown in Table 8 below. Freezing and thawing means that the water absorbed in the capillary is frozen and melted in the concrete. If the freezing and thawing is repeated, fine cracks are generated in the concrete structure and the durability is lowered. Table 8 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 1-1 1-2 2-1 2-2 3-1 3-2 Durability index 91 90 92 91 93 92 68 89

As shown in Table 8, the cement mortar composition for repairing a cross-section and the color cement mortar composition for repairing concrete structures produced according to Examples 1 to 3 were the same as those of the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 And the durability is improved because the durability index is much higher than that of the comparative example.

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 (6)

From 5 to 70% by weight of an inorganic binder, from 25 to 85% by weight of a fine aggregate, from 0.01 to 20% by weight of a polymeric admixture, and from 0.1 to 20%
Wherein the polymeric admixture comprises 50 to 99% by weight of styrene-butadiene, 0.1 to 20% by weight of polymethyl methacrylate, 0.1 to 20% by weight of silicate resin and 0.1 to 20% by weight of silane resin,
Wherein the inorganic binder comprises 20 to 90 wt% of white cement, 5 to 60 wt% of blast furnace slag powder, 1 to 20 wt% of silica powder, 1 to 20 wt% of anhydrous gypsum, 1 to 30 wt% of calcium or magnesium- 0.01 to 10% by weight of alumina cement, 0.01 to 10% by weight of zinc oxide, 0.01 to 10% by weight of bentonite, 0.01 to 10% by weight of alumina silicate based cenosphere powder and 0.01 to 10%
Wherein the fine aggregate comprises 45 to 98 wt% quartz sandy white silica, 1 to 30 wt% of granite silica, and 1 to 54 wt% of dolomite.
The polymeric admixture according to claim 1, wherein the polymeric admixture comprises 0.01 to 10 wt% of a mixture of polyacrylonitrile and methyl cellulose in a weight ratio of 0.1 to 0.8: 0.2 to 0.9, 0.01 to 20 wt% of ethylene vinyl acetate, By weight based on the total weight of the cement mortar composition.
[5] The method according to claim 1, wherein the inorganic binder further comprises 0.01 to 10% by weight of titanium oxide and 0.01 to 10% by weight of a fiber reinforcing agent, wherein the fiber reinforcing agent is one or more fibers selected from nylon, polyethylene and polypropylene Wherein the cement mortar composition is a cement mortar composition for repairing concrete structures.
Chipping impurities and latences of a concrete structure with a hand chipping machine to form micro voids;
Priming the site where the microvoids are formed;
Applying the color cement mortar composition for repairing concrete structures according to claim 1 to the primer treated top to repair a cross section; And
Wherein the cross-section includes surface finishing the recovered product,
Wherein the primer treatment uses at least one material selected from the group consisting of styrene-butadiene latex, polyacrylic ester, ethylvinylacetate, methyl methacrylate, silane-based compounds and polymeric admixtures described in claim 1. Repair method.
Removing impurities, run-ins, or deteriorated portions of the concrete structure with a hand water jet or high-pressure water washing machine;
Priming the removal site;
Inserting a polymeric cement mortar composition for repairing the cross-section on the resultant primer-treated product;
A step of repairing the cross-section by applying the above-mentioned cross-section repairing polymer cement mortar to the upper part of the composition by applying the color cement mortar composition for repairing a concrete structure according to claim 1; And
A step of surface finishing the finished product having a cross section,
Wherein the primer treatment uses at least one material selected from the group consisting of styrene-butadiene latex, polyacrylic ester, ethylvinyl acetate, methyl methacrylate, silane-based compound and polymeric admixture described in claim 1,
The cement mortar composition for repairing an end face of the above-
From 5 to 70% by weight of an inorganic binder, from 25 to 85% by weight of a fine aggregate, from 0.01 to 20% by weight of a polymeric admixture, and from 0.1 to 20%
The inorganic binder of the cement mortar composition for repairing a section is usually 20 to 86% by weight of Portland cement, 10 to 60% by weight of blast furnace slag powder, 1 to 20% by weight of silica powder, 1 to 20% by weight of anhydrous gypsum, 1 to 15% by weight of sulfoaluminate, 0.1 to 10% by weight of alumina cement, 0.01 to 10% by weight of zinc oxide, 0.01 to 10% by weight of bentonite and 0.01 to 10% by weight of alumina silicate based husk ash powder and,
The fine aggregate of the cement mortar composition for repairing a section includes 45 to 98% by weight of granite silica, 1 to 30% by weight of bottom ash and 1 to 54% by weight of dolomite,
The polymer admixture of the cement mortar composition for repairing a cross section includes 50 to 99 wt% of styrene-butadiene, 0.1 to 20 wt% of polymethyl methacrylate, 0.1 to 20 wt% of silicate resin, and 0.1 to 20 wt% of silane resin And the repairing method of the concrete structure.
5. The method of claim 4, further comprising the step of applying a surface finishing material to improve visibility, stain resistance and durability after said surface finishing step,
Wherein the surface finishing material is at least one selected from the group consisting of styrene-butadiene latex, polyacrylic ester, ethylvinyl acetate, methyl methacrylate, silane-based compound, silicate-based inorganic compound, Of the concrete structure.