KR101964367B1 - Composition for repairing and reinforcing concrete structure and method for repairing and reinforcing concrete structure therewith - Google Patents

Abstract

The present invention relates to a composition for repairing and finishing a cross section of a concrete structure, which comprises 10 to 65 wt % of a functional improvement binder, 10 to 85 wt % of a fine aggregate, and 5 to 30 wt % of water, and to a method for repairing and finishing a concrete structure using the same. The functional improvement binder includes, with respect to 100 wt % of the functional improvement binder in total, 15 to 85 wt % of rapid hardening Portland cement, 5 to 45 wt % of calcium or magnesium sulfoaluminate, 3 to 40 wt % of tricalcium aluminate cement, 3 to 40 wt % of calcium chloroaluminate, 1 to 30 wt % of furnace slag, 0.5 to 20 wt % of gelite powder, 0.5 to 15 wt % of gypsum, 0.5 to 15 wt % of tricalcium silicate, 0.5 to 10 wt % of kaolin, 0.5 to 10 wt % of aluminosilicate, 0.1 to 10 wt % of graphene powder, 0.1 to 10 wt % of ethylene-vinyl acetate-vinyl alcohol copolymer, 0.1 to 10 wt % of methylacrylate-butylacrylate-butadiene copolymer, 0.1 to 10 wt % of polyfluorovinyl copolymer, and 0.1 to 10 wt % of polychloro-trifluoroethylene copolymer. Accordingly, when repairing the concrete structure using the composition of the present invention, the bending toughness, abrasion resistance, salt resistance, neutralization resistance, freeze-thaw resistance, and surface hardness of the concrete structure can be improved by using the functional improvement binder.

Description

TECHNICAL FIELD [0001] The present invention relates to a composition for repairing a section of a concrete structure, and a method for repairing a concrete structure using the same. BACKGROUND ART [0002]

The present invention relates to a composition for repairing a section of a concrete structure and a method for finishing a concrete structure using the same. More particularly, the present invention relates to a composition for repairing a section of a concrete structure having excellent strength and durability and having excellent flexural toughness, acid resistance, chemical resistance, salt resistance, Concrete corrosion due to chemical erosion of concrete structure and bridge structure, road facility structure, underground structure (sewage pipe, sewage culvert, sewage box), exponential structure (waterway, aqueduct bridge, canal tunnel) The present invention relates to a composition for repairing a section of a concrete structure and a method for finishing a concrete structure using the same, which can significantly reduce the maintenance cost of the concrete structure.

The deterioration of the performance of the concrete is a crack, and when cracks occur, harmful outside air, moisture and chemical components permeate inside the concrete, thereby further deteriorating the performance of the concrete. In addition, due to the corrosion of the reinforcing bars inside the concrete structure due to moisture and chloride ions penetrating into the concrete, additional cracks occur or concrete falls off, and at the same time, the reinforcing steel section is reduced by the corrosion of the reinforcing bars, The structure may be damaged.

There are coating methods which form the protective coating on the surface of the structure by repairing the concrete structure and the maintenance of the function and prolonging the service life to secure the safety and economical efficiency. The conventional surface protective agents used in the past are basically required It is difficult to meet special performances in addition to performance. The conventional coating method is mainly composed of an organic-based paint such as an epoxy-based paint, an urethane-based paint and an acrylic-based resin paint. In the case of a paint made of an organic-based paint, the paint has an advantage of good workability and excellent adhesiveness and flexibility. The organic material easily deteriorates due to ultraviolet rays, ozone or moisture, resulting in reduced durability, low heat resistance, and contamination with contamination of organic materials such as oil. In addition, the organic binder surface protective agent is deteriorated by various environmental factors after the release of the volatile organic compounds during curing and curing, in particular by acid rain, nitrogen oxides by automobile exhaust gas, sulfur oxides and chlorine ions in the marine environment, It is difficult to secure the durability because the service life is shortened due to yellowing phenomenon, cracking, and swelling phenomenon caused by yellowing.

A problem to be solved by the present invention is to provide a resin composition which is excellent in strength and durability and can improve flexural toughness, acid resistance, chemical resistance, flame retardancy, neutralization resistance, freeze / thaw resistance and watertightness and can prevent corrosion of concrete The present invention provides a composition for maintenance finishing of a concrete structure and a method for finishing a concrete structure using the same, which can significantly reduce maintenance cost of a concrete structure.

The present invention relates to a cementitious Portland cement composition comprising 10 to 65% by weight of a function improving binder, 10 to 85% by weight of a fine aggregate and 5 to 30% by weight of water, From 5 to 45% by weight of calcium or magnesium sulfoaluminate, from 3 to 40% by weight of tricalcium aluminate cement, from 3 to 40% by weight of calcium chloroaluminate, from 1 to 30% by weight of blast furnace slag, 0.5 to 15 wt% of gypsum, 0.5 to 15 wt% of gypsum lime, 0.5 to 10 wt% of kaolin, 0.5 to 10 wt% of aluminosilicate, 0.1 to 10 wt% of graphene powder, 0.1 to 10 wt% of a vinyl alcohol copolymer, 0.1 to 10 wt% of a methyl acrylate-butyl acrylate-butadiene copolymer, 0.1 to 10 wt% of a polyfluorovinyl copolymer, and 0.1 to 10 wt% of a polychloro-trifluoroethylene copolymer ≪ / RTI > by weight, based on the total weight of the composition. It provides a tree structure section maintenance finishing composition.

The function improving binder may be selected from the group consisting of a water reducing agent, a hardening retarder, a defoaming agent, magnesium oxychloride, 3-glycidoxypropyltrimethoxysilane, a polyvinyl ether-based smoothing agent, a polyphenylene sulfide copolymer or cellulose acetate propionate By weight based on the weight of the improving binder.

In order to improve bending and tensile strength, initial plastic cracking, and fracture toughness, the function improving binder may further include at least one selected from polypropylene fibers, polyester fibers, nylon fibers and macro fibers as hydrophilic fibers, And may further contain 0.01 to 5% by weight relative to the weight.

The fine aggregate may comprise 60 to 99% by weight of silica silica and 1 to 40% by weight of magnesite.

The present invention also provides a method of repairing a concrete structure comprising the steps of:

Removing chitin, impurities, deteriorated parts, etc. of concrete by a planer, shot blaster or hand water jet, and cleaning the chitin using a suction device or the like;

A step of improving adhesion of the concrete concrete and the composition for repairing a section of the concrete structure after confirming the moisture content of the cleaned area and treating the primer or blooming to prevent penetration of harmful substances and water;

Placing a composition for repairing the end face of the concrete structure on the primer or the top surface subjected to the flaming treatment, and then finishing the surface;

Finishing the surface with a surface protective composition to improve surface hardening and durability such as abrasion resistance, stain resistance, neutralization resistance, salt resistance, freeze-thaw resistance, ultraviolet resistance and the like; And

Curing step.

 The primer is at least one selected from styrene-butadiene, polyethylene methyl acrylate-butyl acrylate-butadiene copolymer, polyacrylic ester and acrylic emulsion.

Wherein the inorganic filler comprises from 5 to 95% by weight of heavy calcium carbonate, from 1 to 40% by weight of bovisite, from 0 to 40% by weight of inorganic filler, 1 to 20% by weight of hafnium, 1 to 20% by weight of beta-aluminum oxide, 1 to 20% by weight of gelite powder and 1 to 20% by weight of fine ceramic powder.

The inorganic filler may further contain 0.01 to 10% by weight, based on the weight of the inorganic filler, of pigments for implementing fluorine or color for improving strength, corrosion resistance, antifouling, and anticorrosiveness.

Wherein the performance modifier comprises 20-99 wt% methyl methacrylate-methyl acrylate-styrene copolymer, 0.3-35 wt% novolak vinyl ester, 0.1-30 wt% polybenzimidazole, 0.1-0.3 wt% furfuryl alcohol 0.1 wt% To 20% by weight of polyether ketone and 0.5 to 20% by weight of polyetherketone.

The performance modifier may further comprise methyltrichlorosilane, cellulosic acetate, cellulosic acetate butyrate or defoamer in an amount of 0.01 to 10 wt% based on the weight of the performance modifier.

According to the composition for repairing an end face of a concrete structure of the present invention, it is possible to improve flexural toughness, abrasion resistance, flame retardancy, neutralization resistance, freeze-thaw resistance and surface hardness by using a function improving binder. In addition, it is possible to inject only water in the field so as to improve the workability in the field and to express the early strength, thereby shortening the construction period and reducing the traffic opening time.

According to the surface finishing material composition of the present invention, peeling and peeling of the surface finishing material composition do not occur due to the integral action with the concrete, and the abrasion resistance, ultraviolet resistance, neutralization resistance, flame resistance, freezing and thaw resistance, The durability of the concrete structure can be improved and the service life of the concrete structure can be extended, as well as the maintenance cost can be reduced.

Hereinafter, preferred embodiments according to the present invention will be described in detail. However, it will be understood by those skilled in the art 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 changes and modifications may be made without departing from the scope of the present invention. It is not.

The composition for repairing an end face of a concrete structure according to a preferred embodiment of the present invention comprises 10 to 65% by weight of a function improving binder, 10 to 85% by weight of fine aggregate, and 5 to 30% by weight of water.

The function improving binder is used to develop initial strength, to enhance durability, to suppress temperature rise, to improve abrasion resistance, and the like. The composition for maintenance finishing of the concrete structure has 10 to 65 wt% %. When the content of the function improving binder exceeds 65% by weight, the strength and durability are improved, but cracks tend to occur due to the expansion and contraction effect. When the content is less than 10% by weight, workability and cracking But the effect of improving the strength and durability may be weak.

Wherein the function improving binder comprises 15 to 85% by weight of crude steel Portland cement, 5 to 45% by weight of calcium or magnesium sulfoaluminate, 3 to 40% by weight of tricalcium aluminate cement, 3 to 40% by weight of calcium chloraluminate, 0.5 to 10% by weight of kaolin, 0.5 to 10% by weight of aluminosilicate, 0.1 to 10% by weight of graphene powder, 0.1 to 10 wt% of ethylene-vinyl acetate-vinyl alcohol copolymer, 0.1 to 10 wt% of methyl acrylate-butyl acrylate-butadiene copolymer, 0.1 to 10 wt% of polyvinyl fluoride copolymer, 0.1 to 10% by weight of a chlor-trifluoroethylene copolymer.

The crude steel portland cement is preferably used as specified in KS, and cement distributed in the market can be used. It is preferable that the crude steel portland cement is contained in an amount of 15 to 85% by weight based on the function improving binder. If the content of the crude steel Portland cement is more than 85% by weight, the curing rate is accelerated and the workability is lowered. If the content is less than 15% by weight, initial strength development is deteriorated.

The calcium or magnesium sulfoaluminate is used to reduce initial strength development and drying shrinkage. The calcium or magnesium sulfoaluminate is preferably contained in an amount of 5 to 45% by weight with respect to the function improving binding material. If the content of calcium or magnesium sulfoaluminate exceeds 45% by weight, the initial strength development and shrinkage reduction effect may be improved but the workability may be deteriorated. If the content is less than 5% by weight, workability is good, but initial strength development and shrinkage reduction The effect may be weak.

The tricalcium aluminate cement is an inorganic fast hard mineral material added to increase hydration reactivity and inhibit cracking. It reacts with water in an instant when it comes into contact with water to form an ettringite hydrate, It is possible to obtain excellent compressive strength within a short time when mixing. The tri-calcium aluminate cement is preferably contained in an amount of 3 to 40% by weight with respect to the function improving binder. If the content of the tricalcium aluminate cement is less than 3% by weight, the strength improving effect and the crack generation inhibiting effect may be insignificant. When the content of the tricalcium aluminate cement is less than 40 wt% %, The good physical properties can be obtained due to the quick hardening property, but the manufacturing cost is not high and it is not economical.

The blast furnace slag is used for improving latent hydraulic characteristics, long-term strength development and durability. When the weight ratio of the blast furnace slag is increased, the early strength is lowered, but the long-term strength development and durability are increased. The blast furnace slag is preferably contained in an amount of 1 to 30% by weight based on the function improving binder. If the content of the blast furnace slag exceeds 30% by weight, the initial strength is lowered. If the blast furnace slag content is less than 1% by weight, the effect of improving the long-term strength and improving the durability may be insignificant.

The gelite powder is used for improving natural pozzolanic characteristics, long-term strength development and durability. When the weight ratio of the gel light powder is increased, the early strength is lowered, but the long-term strength development and durability are increased. The gel light powder is preferably contained in an amount of 0.5 to 20% by weight with respect to the function improving binder. If the content of the gelite powder exceeds 20% by weight, the initial strength is lowered. If the content is less than 0.5% by weight, the effect of improving the long-term strength and improving the durability may be insignificant.

The gypsum (CaSO ₄₎ is to generate a component, in particular C ₃ A (3CaO and Al ₂ O ₃₎ and Et Lin ZUID (AFt phase, C ₃ A3 and CaSO _{4 and} 32H ₂ O) in the early response of the cement The amount of etrinzite produced decreases with the progress of hydration, or a part of it decreases to monosulfate (AFm phase, C ₃ A .CaSO ₄ .12H ₂ O). When a large amount of 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 etrinzite is mainly present at the initial stage. However, since the composition of the present invention is sufficiently added with the amount of gypsum, the etlinzite is partially present in the long- In this case, 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.

It is preferable that the gypsum is contained in an amount of 0.5 to 15% by weight with respect to the function improving binder. When the weight ratio of the gypsum is increased, rapid curing characteristics are exhibited. When the content of the gypsum is less than 0.5 weight%, strength and workability may be deteriorated. When the content of the gypsum exceeds 15 weight% But it is not economical because the manufacturing cost is high.

The gypsum lime is used to obtain initial strength and drying shrinkage reduction effect. It is preferable that the gypsum lime is contained in the functional improving binder in an amount of 0.5 to 15 wt%. If the content of the gypsum lime is less than 0.5% by weight, the initial strength and shrinkage reduction effect may be deteriorated. If the content is more than 15% by weight, the performance may be improved but the workability may be lowered due to accelerated curing.

The kaolin has pozzolanic and adsorbing properties and is used to control long-term strength development, prevention of material segregation, water resistance, durability and viscosity. The kaolin is preferably contained in the functional improving binder in an amount of 0.5 to 10 wt%. If the content of the kaolin is less than 0.5 wt%, the performance improvement effect becomes insufficient. If the content exceeds 10 wt%, the material separation phenomenon does not occur, but the viscosity increases and the workability may be lowered.

The aluminosilicate powder is used for improving long-term strength, durability and fire resistance. The aluminosilicate powder is preferably contained in an amount of 0.5 to 10% by weight based on the performance improving binder. If the content of the aluminosilicate powder is less than 0.5% by weight, the effect of improving workability, strength and durability may be insignificant, and if the content of the aluminosilicate powder is less than 10% by weight, If it is exceeded, good physical properties can be obtained due to fast curing characteristics, but it is not economical due to high manufacturing cost.

The graphene powder is a semi-metallic material having a thickness of one layer composed of hexagonal honeycomb arrangements of carbon atoms in a two-dimensional sp ² bond, and is very stable not only structurally and chemically, but also has excellent mechanical properties And excellent electrical and thermal conductors. The graphene powder has a specific surface area of 2,000 to 3,000 m ² / g, which is very wide, has excellent tensile strength of about 100 times of iron, and high airtightness to block hydrogen and helium elements, thereby providing excellent durability.

The graphene powder is used for improving the strength, particularly the warping and tensile strength by reducing the water-cement ratio, and improving the durability such as waterproofness, corrosion resistance and abrasion resistance. It is preferable that the graphene powder is contained in an amount of 0.1 to 10 wt% with respect to the function improving binder. If the content of the graphene powder is less than 0.1% by weight, the performance improving effect is deteriorated. If the content is more than 10% by weight, the performance is improved but the workability and economical efficiency are deteriorated.

The ethylene-vinyl acetate-vinyl alcohol copolymer is used to induce a bond between oil and minerals and to improve strength and durability. It is preferable that the ethylene-vinyl acetate-vinyl alcohol copolymer is contained in an amount of 0.1 to 10 wt% with respect to the function improving binder. When the content of the ethylene-vinyl acetate-vinyl alcohol copolymer is less than 0.1 wt% And the effect of improving durability such as strength, salt resistance and freeze-thaw resistance may be weak. When the content is more than 10% by weight, the effect of inducing further inter-mineral bond induction, strength and durability It is hard to expect and it is not economical.

The methyl acrylate-butyl acrylate-butadiene copolymer serves to improve strength, toughness and durability. The methyl acrylate-butyl acrylate-butadiene copolymer is preferably contained in an amount of 0.1 to 10 wt% with respect to the function improving binder. If the content of the methyl acrylate-butyl acrylate-butadiene copolymer is less than 0.1 wt% The effect of improving adhesion and toughness may be insignificant. If the content is more than 10% by weight, further improvement in adhesion and toughness may not be expected and it is not economical.

The polyvinyl fluoride copolymer is used for improving adhesion strength, ultraviolet resistance and durability. It is preferable that the polyvinyl fluoride copolymer is contained in an amount of 0.1 to 10 wt% with respect to the function improving binder. When the content of the polyvinyl fluoride copolymer exceeds 10 wt%, the performance is improved, And the price competitiveness may be deteriorated. If the content is less than 0.1% by weight, the workability is improved, but the effect of improving the performance may be insufficient to improve the elasticity and durability.

The polychloro-trifluoroethylene copolymer is used for improving ductility, adhesive strength and durability. The polychloro-trifluoroethylene copolymer is preferably contained in an amount of 0.1 to 10% by weight based on the performance improving binder, and when the content of the polychloro-trifluoroethylene copolymer exceeds 10% by weight, However, if the content is less than 0.1% by weight, the effect of improving the performance is weak and the brittleness is intensified, so that the impact strength may be lowered.

The high-performance water reducing agent is used to ensure water-cement ratio reduction and workability. The high performance water reducing agent is preferably contained in an amount of 0.01 to 10 wt% based on the performance improving binder.

The curing retarder is used for delaying rapid curing in order to ensure workability for a certain period of time, and it is preferable that the curing retardant is contained in an amount of 0.01 to 10 wt% with respect to the function improving binder. As the hardening retarder, generally 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 and citric acid, aminocarboxylic acids or salts thereof, Or derivatives thereof, polyhydric alcohols such as glycerin, and the like.

The antifoaming agent is used to improve the strength and durability by adjusting the amount of air. The antifoaming agent is preferably contained in an amount of 0.01 to 10 wt% with respect to the function improving binder.

The magnesium oxychloride is used for improving initial strength, abrasion resistance and fire resistance. The magnesium oxychloride is preferably contained in an amount of 0.01 to 10% by weight based on the performance improving binder, and when the content of magnesium oxychloride exceeds 10% by weight, the performance is improved but the workability and economy are lowered, If the content is less than 0.01% by weight, the performance improvement effect is insufficient.

The 3-glycidoxypropyltrimethoxysilane is used for improving the reactivity to improve strength and durability. The 3-glycidoxypropyltrimethoxysilane is preferably contained in an amount of 0.01 to 10% by weight based on the functional bonding material, and when the content of the 3-glycidoxypropyltrimethoxysilane exceeds 10% by weight, But workability and economy are deteriorated. When the content is less than 0.01% by weight, the effect of improving the performance is insufficient.

The polyvinyl ether type smoothing agent is used to prevent defects on the surface such as brush marks, roller marks, orange peal, cratering, pinhole, color stain and the like. The polyvinyl ether-based smoothing agent is preferably contained in an amount of 0.01 to 10 wt% with respect to the function improving binder. If the content of the polyvinyl ether-based smoothing agent exceeds 10% by weight, the performance is improved but the workability and economical efficiency are deteriorated. If the content is less than 0.01% by weight, the performance improvement effect is insufficient.

The polyphenylene sulfide copolymer is used for improving heat resistance and water resistance. It is preferable that the polyphenylene sulfide copolymer is contained in an amount of 0.01 to 10 wt% with respect to the function improving binder. If the content of the polyphenylene sulfide copolymer exceeds 10% by weight, the performance is improved but the workability and economical efficiency are deteriorated. If the content is less than 0.01% by weight, the performance improvement effect becomes insufficient.

The cellulose acetic acid propionate is used for improving the material separation resistance and water resistance. The cellulose acetic acid propionate is preferably contained in an amount of 0.01 to 10% by weight with respect to the function improving binder. If the content of the cellulose acetate acetic acid propionate exceeds 10% by weight, the performance is improved but the workability and economical efficiency are lowered. If the content is less than 0.01% by weight, the performance improvement effect is insufficient.

The hydrophilic fiber is used for improving warpage and tensile strength, initial plastic cracking, and fracture toughness. As the hydrophilic fiber, it is preferable to use at least one material selected from polypropylene fiber, polyester fiber, nylon fiber and macro fiber. The hydrophilic fiber is preferably contained in an amount of 0.01 to 5% by weight based on the functional binder.

The fine aggregate may comprise silica silica and magnesite. The fine aggregate preferably comprises 60 to 99% by weight of silica silica and 1 to 40% by weight of magnesite.

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 use of the fine aggregate containing the magnesite excellent in the far-infrared ray effect has an advantage of excellent heat insulation and strength, and excellent durability against acidity, salt corrosion and the like.

It is preferable that the silica silica has a particle size of from 4 to 6 (0.05 to 2.0 mm). If the particle size of the silica silicate silica is larger than the above range, the fluidity of the composition for repairing the end face of the concrete structure may be lowered. If the particle size is smaller than that, the workability of the composition for repairing the end face of the concrete structure may be deteriorated. The silica silica is preferably contained in an amount of 60 to 99% by weight based on the fine aggregate.

The magnesite is an aggregate having excellent abrasion resistance and fire resistance and is used for improving strength, abrasion resistance and fire resistance in a composition for repairing a section of a concrete structure. The magnesite is preferably contained in an amount of 1 to 40% by weight based on the fine aggregate.

Meanwhile, the present invention provides a surface protective composition for improving strength, ultraviolet ray resistance, abrasion resistance, neutralization resistance, salt resistance, freeze-thaw resistance, stain resistance and the like.

The surface protective composition comprises 5 to 90% by weight of an inorganic filler and 10 to 95% by weight of a performance modifier based on the weight of the surface protective composition, wherein the inorganic filler comprises 5 to 95 wt% of ground calcium carbonate , 1 to 40% by weight of bovisite, 1 to 20% by weight of hafnium oxide, 1 to 20% by weight of beta-aluminum oxide, 1 to 20% by weight of gelite powder and 1 to 20% by weight of fine ceramic powder Do.

The heavy calcium carbonate is used for improving the filling property, impact resistance, warmth and fire resistance. The heavy calcium carbonate is preferably contained in an amount of 5 to 95% by weight based on the inorganic filler. When the content of the heavy calcium carbonate exceeds 95% by weight, the performance is improved but the workability is deteriorated. The workability is improved but the effect of improving the impact resistance, warmth and fire resistance may be weak.

The bauxite has a light gray color, a yellowish brown color, and is excellent in strength, abrasion resistance and fire resistance, and is used for improving strength, abrasion resistance and fire resistance. The bauxite is preferably contained in an amount of 1 to 40% by weight based on the inorganic filler. When the content of the bauxite exceeds 40% by weight, the abrasion resistance and the fire resistance are improved but the workability is lowered. When the amount is less than 10% by weight, the workability is improved but the effect of improving abrasion resistance and fire resistance may be weak.

The hafnium oxide is used for improving corrosion resistance, abrasion resistance, fire resistance, and the like. The hafnium oxide is preferably contained in an amount of 1 to 20 wt% with respect to the inorganic filler. When the hafnium oxide content is more than 20 wt%, abrasion resistance and fire resistance are improved but workability is deteriorated. When the amount is less than 10% by weight, the workability is improved but the effect of improving abrasion resistance and fire resistance may be weak.

The beta-aluminum oxide is used for improving strength, chemical resistance, corrosion resistance, abrasion resistance and the like. Preferably, the beta-aluminum oxide is contained in an amount of 1 to 20% by weight based on the inorganic filler, and when the content of the beta-aluminum oxide is more than 20% by weight, performance is improved but workability and economical efficiency are deteriorated, Is less than 1% by weight, the effect of improving the performance may be weak.

Gel light powder in the surface protective composition is used for improving durability. When the weight ratio of the gel light powder is increased, the long-term strength development and durability are increased. The gel light powder is preferably contained in an amount of 1 to 20% by weight based on the inorganic filler. If the content of the gelite powder exceeds 20% by weight, the reactivity decreases. If the content of the gelite powder is less than 1% by weight, the effect of improving the performance may be weak.

The fine ceramic powder is used for strength, abrasion resistance, impact resistance, durability and the like. The fine ceramic powder is preferably contained in an amount of 1 to 20% by weight based on the inorganic filler. If the content of the fine ceramic powder exceeds 20% by weight, the performance is improved but the workability and economical efficiency are lowered. If the content is less than 1% by weight, the effect of improving the performance may be weak.

The fluorine is used for improving strength, corrosion resistance, antifouling, anticorrosive, and the like. The fluorine is preferably contained in an amount of 0.01 to 10 wt% with respect to the inorganic filler. If the content of fluorine exceeds 10% by weight, the performance is improved but the workability and economy are deteriorated. If the content is less than 0.01% by weight, the effect of improving the performance may be weak.

The pigment is used to implement color and improve the appearance. The pigment may be at least one material selected from titanium dioxide, red iron oxide, yellow iron oxide, chromium oxide (Cr ₂ O ₃ ), purple iron oxide, black iron oxide, carbon black and barium sulfate. The pigment is preferably contained in an amount of 0.01 to 10% by weight based on the inorganic filler.

Wherein the performance modifier comprises 20-99 wt% methyl methacrylate-methyl acrylate-styrene copolymer, 0.3-35 wt% novolak vinyl ester, 0.1-30 wt% polybenzimidazole, 0.1-0.3 wt% furfuryl alcohol 0.1 wt% To 20% by weight of the polyether ketone and 0.5 to 20% by weight of the polyether ketone.

The methyl methacrylate-methyl acrylate-styrene copolymer is used to improve durability such as workability, ductility, abrasion resistance, and chemical resistance. Further, the methyl methacrylate-methyl acrylate-styrene copolymer is excellent in acid resistance and alkali resistance and has an effect of improving the strength. The methyl methacrylate-methyl acrylate-styrene copolymer is preferably contained in an amount of 20 to 99% by weight based on the performance modifying blend, wherein the content of the methyl methacrylate-methyl acrylate-styrene copolymer is 99% The performance is improved but the material separation is likely to occur and the price competitiveness may be deteriorated. If the content is less than 20% by weight, durability and strength improvement effect may be weak.

The novolak vinyl ester is used for improving adhesion, durability and the like. The novolak vinyl ester is preferably contained in an amount of 0.3 to 35% by weight based on the performance modifier. When the content of the novolac vinyl ester is less than 0.3% by weight, the effect of improving the adhesion and durability is insignificant. If the weight percentage is exceeded, it is difficult to expect a further performance improvement effect, and the workability may be deteriorated.

The polybenzimidazole is used to improve heat resistance and chemical resistance. It is preferable that the polybenzimidazole is incorporated in the performance modifier in an amount of 0.1 to 30 wt%. When the content of the polybenzimidazole exceeds 30 wt%, the performance is improved but the material is easily separated, If it is less than 0.1% by weight, the effect of improving the performance may be small.

The furfuryl alcohol is used for improving corrosion resistance, heat resistance and chemical resistance. If the content of the furfuryl alcohol exceeds 20 wt%, the performance is improved but the material is easily separated, and the content of the furfuryl alcohol is 0.1 wt% %, The performance improvement effect may be small.

The polyether ketone is used for improving impact resistance, fatigue resistance, heat resistance and the like. It is preferable that the polyether ketone is incorporated in the performance modifier in an amount of 0.5 to 20 wt%. If the content of the polyether ketone exceeds 20 wt%, the performance is improved but the material is easily separated, %, The performance improvement effect may be small.

The performance modifier may further include methyltrichlorosilane in an amount of 0.01 to 10 wt% based on the weight of the performance modifier to improve reactivity and improve strength and durability. If the content of the methyltrichlorosilane exceeds 10% by weight, the performance is improved but the reactivity is increased and the workability is lowered. If the content is less than 0.01% by weight, the effect of improving the performance may be weak.

The performance modifier may further contain 0.01 to 10 wt% of cellulosic acetate based on the weight of the performance modifier to prevent material separation. If the content of the cellulose acetic acid exceeds 10% by weight, the performance is improved but the viscosity is increased to lower the workability. If the content is less than 0.01% by weight, the effect of improving the performance becomes weak and the material separation may occur.

In addition, the performance modifier may be prepared by adding cellulosic acetate butyrate to prevent surface defects such as brush marks, roller marks, orange peaks, cratering, pinholes, 0.01 to 10% by weight based on the weight of the performance modifier. If the content of the cellulose acylate butyrate exceeds 10% by weight, surface defects are small, but material separation is likely to occur. If the content is less than 0.01% by weight, the effect of improving the performance may be insignificant.

In addition, the performance modifier may further include an antifoaming agent to reduce an increase in the amount of air due to generation of entrained air, in an amount of 0.01 to 10 wt% based on the weight of the performance modifier. If the content of the antifoaming agent exceeds 10% by weight, the film is creaming and the strength and durability are deteriorated. If the content of the antifoaming agent is less than 0.01% by weight, the effect of reducing the air amount may be insignificant.

The composition for repairing a section of a concrete structure according to a preferred embodiment of the present invention is prepared by premixing 10 to 65% by weight of the function improving binder and 10 to 85% by weight of fine aggregate in a forced mixer or a vacuum type mixer, %, And mixing the mixture with a forced mixer or a continuous mixer for a predetermined time (for example, 1 to 5 minutes).

Also, the surface protective composition according to a preferred embodiment of the present invention may be prepared by mixing 5 to 90% by weight of an inorganic filler and 10 to 95% by weight of a performance modifier with a forced mixer or a continuous mixer for a predetermined time (for example, 1 to 5 minutes) Can be manufactured.

The present invention proposes a repair finishing method for a concrete structure using a composition for maintenance finishing of the above-mentioned concrete structure. Hereinafter, the concrete structure means a road structure (a road section, a median block, a wing wall, etc.), a road pavement structure, a road surface, a bridge structure (bridge pavement, bridge upper and lower slab, bridge, foundation), an underground structure , Sewage pipes, sewage boxes), exponential structures (waterways, aqueducts, canal tunnels), and so on.

The concrete structure repair finishing method according to a preferred embodiment of the present invention includes the steps of chipping and removing a laying, an impurity, and a deteriorated portion of concrete by a planer, a short blaster, or a hand water jet, A step of improving adhesiveness of the concrete concrete and the composition for repairing a section of the concrete structure after confirming the moisture content of the cleaned area and treating the primer or blooming to prevent infiltration of harmful substances and water, A surface finishing step of applying a composition for repairing a section of the concrete structure to the upper surface of the concrete structure and a step of finishing the surface of the concrete structure to improve the surface layer strengthening and durability such as abrasion resistance, stain resistance, neutralization resistance, flame resistance, Closing the surface with a protective composition; And a curing step of curing the concrete structure.

The step of cleaning may further include a step of using the vacuum suction vehicle to clean the area where the repair area is large.

The primer may include at least one material selected from styrene-butadiene, polyethylene methyl acrylate-butyl acrylate-butadiene copolymer, polyacrylic ester, and acrylic emulsion.

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

(Preparation of Composition for Maintenance Finishing of Concrete Structure)

≪ Example 1 >

5 kg of calcium chloride aluminate, 5 kg of calcium chloride aluminate, 5 kg of blast furnace slag, 5 kg of gel light powder, 5 kg of gypsum, 5 kg of gypsum lime, 5 kg of kaolin, 1 kg of aluminosilicate, 0.5 kg of a fin powder, 0.5 kg of an ethylene-vinyl acetate-vinyl alcohol copolymer, 0.5 kg of a methyl acrylate-butyl acrylate-butadiene copolymer, 0.5 kg of a polyfluorovinyl copolymer, 0.5 kg of a polycarboxylic acid-based water reducing agent, 0.5 kg of citric acid as a curing retarder, 0.5 kg of a silicone-based defoaming agent, 0.5 kg of nylon fibers as hydrophilic fibers, 0.5 kg of magnesium oxychloride, 0.5 kg of 3-glycidoxypropyltrimethoxysilane, 0.5 kg of a polyvinyl ether-based smoothing agent, 0.5 kg of a polyphenylene sulfide copolymer, and 0.5 kg of celluloses of acetic acid propionate were mixed to obtain 100 kg of a functionally improving binding material .

50 kg of the fine aggregate mixed with 40 kg of the functional improving binder obtained above and silica silicate and magnesite at a weight ratio of 9: 1 were premixed in a forced mixer, and then 10 kg of water was added. After stirring for 2 minutes, 100 kg of a composition was prepared.

≪ Example 2 >

33 kg of crude steel Portland cement, 20 kg of calcium magnesium sulphoaluminate, 5 kg of tricalcium aluminate cement, 5 kg of calcium chloraluminate, 5 kg of blast furnace slag, 5 kg of gelite powder, 5 kg of gypsum, 5 kg of gypsum lime, 5 kg of kaolin, 0.5 kg of graphene powder, 1 kg of ethylene-vinyl acetate-vinyl alcohol copolymer, 1 kg of methyl acrylate-butyl acrylate-butadiene copolymer, 1 kg of polyfluorovinyl copolymer, 1 kg of polychloro-trifluoroethylene copolymer, 0.5 kg of a polycarbonate-based water-reducing agent, 0.5 kg of citric acid as a curing retarder, 0.5 kg of a silicone antifoam, 0.5 kg of nylon fiber as a hydrophilic fiber, 0.5 kg of magnesium oxychloride, 1 kg of 3-glycidoxypropyltrimethoxysilane, 1 kg of smoothness, 1 kg of polyphenylene sulfide copolymer and 1 kg of cellulosic acetate propionate were mixed to obtain 100 kg of a functionally improving binding material.

50 kg of the fine aggregate mixed with 40 kg of the functional improving binder obtained above and silica silicate and magnesite at a weight ratio of 9: 1 were premixed in a forced mixer, and then 10 kg of water was added. After stirring for 2 minutes, 100 kg of the composition was prepared.

≪ Example 3 >

27 kg of crude steel Portland cement, 20 kg of calcium or magnesium sulfoaluminate, 5 kg of tricalcium aluminate cement, 5 kg of calcium chloraluminate, 5 kg of blast furnace slag, 5 kg of gel light powder, 5 kg of gypsum, 5 kg of gypsum lime, 5 kg of kaolin, , 0.5 kg of graphene powder, 2 kg of ethylene-vinyl acetate-vinyl alcohol copolymer, 2 kg of methyl acrylate-butyl acrylate-butadiene copolymer, 2 kg of polyfluorovinyl copolymer, 2 kg of polychloro-trifluoroethylene copolymer 0.5 kg of a polycarboxylic acid-based water reducing agent, 0.5 kg of citric acid as a curing retarder, 0.5 kg of a silicone-based defoaming agent, 0.5 kg of nylon as a hydrophilic fiber, 0.5 kg of magnesium oxychloride, 2 kg of 3-glycidoxypropyltrimethoxysilane, 2 kg of smoothness, 1 kg of polyphenylene sulfide copolymer and 1 kg of cellulosic propionate acetate were mixed to obtain 100 kg of a functionally improving binding material.

50 kg of the fine aggregate mixed with 40 kg of the functional improving binder obtained above and silica silicate and magnesite at a weight ratio of 9: 1 were premixed in a forced mixer, and then 10 kg of water was added. After stirring for 2 minutes, 100 kg of a composition was prepared.

A comparative example is presented to more easily grasp the characteristics of Embodiments 1 to 3 according to the present invention. It is to be noted that Comparative Example 1 described below is provided merely for comparison with the characteristics of the embodiments, and is not a prior art of the present invention.

≪ Comparative Example 1 &

40 kg of crude steel Portland cement, 50 kg of fine aggregate and 4 kg of ethylene-vinyl acetate-vinyl alcohol copolymer were premixed in a forced mixer, and then 6 kg of water was added and stirred for 2 minutes to prepare 100 kg of a polymer cement mortar composition.

<Test Example>

The following experiments show experimental results comparing characteristics of the embodiment of the present invention with those of Comparative Example 1 in order to more easily grasp the characteristics of Embodiments 1 to 3 according to the present invention.

Experiment 1 (compression, flexure and adhesion strength measurement)

In order to compare the physical properties of the self-healing environmental-friendly cement mortar composition for repairing and reinforcing concrete structures produced according to Examples 1 to 3 and the polymer-cement mortar composition prepared in Comparative Example 1, Compression, flexure and adhesion strength tests of the composition for repairing a section of a concrete structure according to Example 3 and the polymer-cement mortar composition prepared according to Comparative Example 1 were conducted by KS F 4042 (polymer cement mortar for repairing concrete structures) And the results are shown in Table 1 below.

Example 1 Example 2 Example 3 Comparative Example 1 burglar
(MPa) warp 11.1 12.3 12.8 10.3 compression 54.5 56.9 59.1 50.9 adhesion Standard condition 2.2 2.3 2.4 2.0 After warm-cold repeat 2.1 2.2 2.3 1.8

Compared to the polymer cement mortar composition prepared according to Comparative Example 1, the flexural, compressive and adhesive strengths of the compositions for repairing the cross-section of the concrete structure prepared according to Examples 1 to 3 of the present invention, Respectively.

Experiment 2 (Measurement of rate of change of length)

The composition for repairing a section of the concrete structure according to Examples 1 to 3 of the present invention and the polymer-cement mortar composition prepared according to Comparative Example 1 was measured by KS F 4042 (polymer cement mortar for repairing concrete structures) And the results are shown in Table 2 below.

Example 1 Example 2 Example 3 Comparative Example 1 Length change rate (%) 0.028 0.019 0.012 0.041

As shown in the above Table 2, the composition for repair finishing the concrete structure according to Examples 1 to 3 has a shrinkage reduction effect due to a decrease in the rate of change in length as compared with the polymer cement mortar composition prepared according to Comparative Example 1 .

Experiment 3 (Measurement of permeability)

A composition for repairing a section of a concrete structure according to Examples 1 to 3 of the present invention and a polymer-cement mortar composition prepared according to Comparative Example 1 were prepared by KS F 4042 (Polymer Cement Mortar for Repairing Concrete Structures) The results of the measurement of the permeability are shown in Table 3 below. If the amount of water permeates, if the 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 Permeability (g) 0.3 0.2 0.15 0.48

As shown in Table 3, the water-repellent amount of the composition for repairing the cross-section of the concrete structure prepared according to Examples 1 to 3 was lower than that of the polymer-cement mortar composition prepared according to Comparative Example 1.

Experiment 4 (Chloride ion penetration resistance measurement)

The composition for repairing the cross-section of the concrete structure prepared according to Examples 1 to 3 of the present invention and the polymer-cement mortar composition prepared according to Comparative Example 1 was applied to KS F 4042 (polymer cement mortar for repairing concrete structures) The penetration resistance test was performed, and the results are shown in Table 4 below.

Example 1 Example 2 Example 3 Comparative Example 1 Chloride ion penetration resistance
(coulombs) 420 350 300 510

As shown in the above Table 4, the composition for repair finishing the concrete structure according to Examples 1 to 3 had less resistance to chloride ion penetration than the polymer cement mortar composition prepared according to Comparative Example 1, And the resistance was high.

Experiment 5 (Measurement of neutralization resistance)

The composition for repairing a section of a concrete structure according to Examples 1 to 3 of the present invention and the polymeric cement mortar composition prepared according to Comparative Example 1 were tested for KS F 4042 (polymer cement mortar for repairing concrete structures) And the results are shown in Table 5 below.

Example 1 Example 2 Example 3 Comparative Example 1 Neutralization resistance (mm) 0.2 0.15 0.11 0.4

As shown in Table 5 above, the composition for repairing a section of a concrete structure according to Examples 1 to 3 has a lower neutralization penetration depth than that of the polymer-cement mortar composition prepared according to Comparative Example 1, Was high.

Experiment 6 (Chemical resistance measurement)

The composition for repairing a section of a concrete structure according to Examples 1 to 3 of the present invention and the polymer-cement mortar composition prepared according to Comparative Example 1 were tested according to the Japanese Industrial Standards (Test Method for Chemical Resistance by Solution Deposition of Concrete) , The aqueous solution of 2% hydrochloric acid, 5% sulfuric acid and 45% sodium hydroxide was immersed in the test solution for 28 days, and the measurement results of the chemical resistance test are shown in Table 6 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Weight change rate
(%) Hydrochloric acid -0.8 -0.6 -0.45 -1.1 Sulfuric acid -0.02 0.1 0.15 -0.11 Sodium hydroxide +0.5 +0.9 +1.1 +0.3

As shown in the above Table 6, the composition for repairing a section of a concrete structure according to Examples 1 to 3 showed less weight change rate with respect to chemical resistance than the polymer cement mortar composition prepared according to Comparative Example 1 And it was confirmed that they are highly resistant to chemicals.

Experiment 7 (durability measurement)

The composition for repairing a section of a concrete structure according to Examples 1 to 3 of the present invention and the polymer-cement mortar composition prepared according to Comparative Example 1 were measured according to the method defined in KS F 2456 Are shown in Table 7 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 7 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 Durability index 92 93 94 89

As shown in Table 7, the durability index of the composition for repair finishing the concrete structure according to Examples 1 to 3 is much higher than that of the polymer-cement mortar composition prepared according to Comparative Example 1, .

Experiment 8 (Measurement of compressive strength)

The alkali resistance test of the composition for repairing a section of a concrete structure according to Examples 1 to 3 of the present invention and the polymer cement mortar composition prepared according to Comparative Example 1 was applied to KS F 4042 (polymer cement mortar for repairing concrete structures) (50 ± 2) ° C for 28 days and then cooled to room temperature to measure the compressive strength. The results are shown in Table 8 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Compressive strength
(kgf / cm2) 43.0 47.5 49.3 39.2

As shown in Table 8, the compressive strength of the composition for repairing a section of a concrete structure according to Examples 1 to 3 was higher than that of the polymer-cement mortar composition prepared according to Comparative Example 1, and the resistance to alkali resistance Was high.

Experiment 9 (Measurement of moisture permeation resistance)

The composition for repairing a section of a concrete structure according to Examples 1 to 3 of the present invention and the polymer-cement mortar composition prepared according to Comparative Example 1 were subjected to moisture permeation by KS F 4042 (polymer cement mortar for repairing concrete structures) A resistance test was conducted and the results are shown in Table 9 below.

Example 1 Example 2 Example 3 Comparative Example 1 Moisture permeation resistance (m) 0.4 0.2 0.2 0.6

As shown in Table 9 above, the composition for repairing a section of a concrete structure according to Examples 1 to 3 had a lower neutralization penetration depth than that of the polymer-cement mortar composition prepared according to Comparative Example 1, Was high.

(Preparation of surface protective composition)

<Example 4>

65 kg of heavy calcium carbonate, 10 kg of bovisite, 5 kg of hafnium oxide, 5 kg of beta-aluminum oxide, 5 kg of gelite powder, 5 kg of fine ceramic powder, 3 kg of fluorine and 2 kg of pigment were mixed to obtain 100 kg of inorganic filler.

Separately, 92 kg of methyl methacrylate-methyl acrylate-styrene copolymer, 1 kg of novolak vinyl ester, 1 kg of polybenzimidazole, 1 kg of furfuryl alcohol, 1 kg of polyether ketone, 1 kg of methyltrichlorosilane, 1 kg of cellulose triacetate , 1 kg of cellulosic acetate butyrate and 1 kg of a silicone antifoamer were mixed to obtain 100 kg of a performance modifier.

25 kg of the inorganic filler obtained above and 75 kg of the performance modifier were added and stirred with a forced mixer for 2 minutes to prepare 100 kg of the surface finish composition according to the present invention.

&Lt; Example 5 >

100 kg of an inorganic filler was obtained by weighing 65 kg of heavy calcium carbonate, 10 kg of bovisite, 5 kg of hafnium oxide, 5 kg of beta-aluminum oxide, 5 kg of gelite powder, 5 kg of fine ceramic powder, 3 kg of fluorine and 2 kg of pigment.

Separately, 86 kg of methyl methacrylate-methyl acrylate-styrene copolymer, 2 kg of novolak vinyl ester, 2 kg of polybenzimidazole, 2 kg of furfuryl alcohol, 2 kg of polyether ketone, 2 kg of methyltrichlorosilane, , 1 kg of cellulosic acetate butyrate and 1 kg of a silicone antifoamer were mixed to obtain 100 kg of a performance modifier.

25 kg of the inorganic filler obtained above and 75 kg of the performance modifier were added and stirred with a forced mixer for 2 minutes to prepare 100 kg of the surface finish composition according to the present invention.

&Lt; Example 6 >

100 kg of inorganic filler was obtained by mixing 65 kg of heavy calcium carbonate, 10 kg of bovisite, 5 kg of hafnium oxide, 5 kg of beta-aluminum oxide, 5 kg of gelite powder, 5 kg of fine ceramic powder, 3 kg of fluorine and 2 kg of pigment.

Separately, 80 kg of methyl methacrylate-methyl acrylate-styrene copolymer, 3 kg of novolak vinyl ester, 3 kg of polybenzimidazole, 3 kg of furfuryl alcohol, 3 kg of polyether ketone, 3 kg of methyltrichlorosilane, , 1 kg of cellulosic acetate butyrate and 1 kg of a silicone antifoamer were mixed to obtain 100 kg of a performance modifier.

25 kg of the inorganic filler obtained above and 75 kg of the performance modifier were added and stirred for 2 minutes with a forced mixer to prepare 100 kg of the surface finish composition according to the present invention.

The comparative example 2 which can be compared with the embodiments of the present invention is provided so as to more easily grasp the characteristics of the above-mentioned fourth to sixth embodiments.

&Lt; Comparative Example 2 &

25 kg of heavy calcium carbonate and 75 kg of methyl methacrylate-methyl acrylate-styrene copolymer were added and stirred for 2 minutes with a forced mixer to prepare 100 kg of a finish composition.

(Preparation of Test Specimens)

100 × 100 mm (appearance after forming a coating film), 100 × 100 × 100 mm mortar plate (manufactured by Shin-Etsu Chemical Co., Ltd.) by KS F 4936 (coating material for concrete protection) according to the formulations shown in Examples 4 to 6 and Comparative Example 2 of the present invention 150 × 40 mm mortar plate (water permeable), 70 × 70 × 20 mm mortar plate (adhesion strength) and 230 × 90 × 6 mm (depth of neutralization), 100 × 50 mm mortar plate (chloride ion penetration resistance) The specimens were fabricated using a flex plate (neutralization depth) and cured at a temperature of (20 ± 2) ° C and a humidity of (65 ± 10)%.

Experiment 10 (appearance after coating formation)

Table 10 below shows the appearance after the coating films of the compositions prepared according to Examples 4 to 6 and the compositions prepared according to Comparative Example 2 were formed.

division Example 4 Example 5 Example 6 Comparative Example 2 After standard curing clear clear clear clear After accelerated weathering test After repeated cold and cold tests After alkali resistance test After the salt water resistance test

As shown in Table 10, the composition prepared according to Examples 4 to 6 and the composition prepared according to Comparative Example 2 showed no abnormal appearance after the formation of the coating film.

Experiment 11 (neutralization depth)

Neutralization depth tests of the composition prepared according to Examples 1 to 3 and the composition prepared according to Comparative Example 1 were carried out, and the results are shown in Table 11 below.

division Example 4 Example 5 Example 6 Comparative Example 2 Neutralization Depth
(mm) - - - 0.02

As shown in Table 11, the compositions prepared according to Examples 4 to 6 have excellent neutralization resistance as compared with the compositions prepared according to Comparative Example 2.

Experiment 12 (Chloride ion penetration resistance)

The chloride ion penetration resistance test of the compositions prepared according to Examples 4 to 6 and the composition prepared according to Comparative Example 2 was carried out, and the results are shown in Table 12 below.

division Example 4 Example 5 Example 6 Comparative Example 2 Chloride ion
Penetration resistance
(Coulombs) 60 42 22 100

As shown in Table 12, the compositions prepared according to Examples 4 to 6 exhibited excellent chloride ion penetration resistance as compared with the composition prepared according to Comparative Example 2. [

Experiment 13 (moisture permeability)

The moisture permeability of the compositions prepared according to Examples 4 to 6 and the compositions prepared according to Comparative Example 2 were measured, and the results are shown in Table 13 below.

division Example 4 Example 5 Example 56 Comparative Example 2 Moisture permeability
(g / m ²占 폚) 17 15 13 21

As shown in Table 13, the compositions prepared according to Examples 4 to 6 of the present invention showed lower moisture permeability than the compositions prepared according to Comparative Example 2. [

Experiment 14 (Bond Strength)

Bond strength tests of the compositions prepared according to Examples 4 to 6 and the compositions prepared according to Comparative Example 2 were carried out, and the results are shown in Table 14.

division Example 4 Example 5 Example 6 Comparative Example 2 Bond strength
(N / mm ² ) After standard curing 1.5 1.7 1.8 1.3 After accelerated weathering test 1.4 1.6 1.7 1.2 After repeated cold and cold tests 1.4 1.5 1.7 1.1 After alkali resistance test 1.4 1.6 1.7 1.2 After the salt water resistance test 1.4 1.6 1.7 1.1

As shown in Table 14, it can be seen that Examples 4 to 6 exhibit higher adhesive strength than Comparative Example 2.

Experiment 15 (Crack Resistance)

Crack correspondence tests of the compositions prepared according to Examples 4 to 6 and the compositions prepared according to Comparative Example 2 were carried out, and the results are shown in Table 15 below.

division Example 4 Example 5 Example 6 Comparative Example 2 Crack Resistance -20 ° C clear clear clear clear 20 ℃ clear clear clear clear After accelerated weathering test clear clear clear clear

As shown in Table 15, it was found that the compositions prepared according to Examples 4 to 6 and the compositions prepared according to Comparative Example 2 had no abnormality in crack correspondence.

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, but, on the contrary, This is possible.

Claims (10)

delete delete delete delete Removing chitin, impurities, deteriorated parts, etc. of concrete by a planer, shot blaster or hand water jet, and cleaning the chitin using a suction device or the like;
A primer or blooming treatment to improve adhesion of the concrete concrete and the composition for repairing the end face of the concrete structure and to prevent penetration of harmful substances or water after confirming the moisture content of the cleaned part;
10 to 65% by weight of a functional improving binder, 10 to 85% by weight of a fine aggregate and 5 to 30% by weight of water on a primer or a flooded top; Wherein the function improving binder is selected from the group consisting of 15 to 84% by weight of crude steel Portland cement, 5 to 45% by weight of calcium or magnesium sulfoaluminate, 3 to 40% by weight of tricalcium aluminate cement, Wherein the slag is composed of 3 to 40 wt% of aluminate, 1 to 30 wt% of blast furnace slag, 0.5 to 20 wt% of gelled powder, 0.5 to 15 wt% of gypsum, 0.5 to 15 wt% 0.1 to 10 wt% of silane, 0.1 to 10 wt% of graphene powder, 0.1 to 10 wt% of ethylene-vinyl acetate-vinyl alcohol copolymer, 0.1 to 10 wt% of methyl acrylate-butyl acrylate-butadiene copolymer, 0.1 to 10% by weight of a polyvinyl chloride copolymer, 0.1 to 10% by weight of a polychloro-trifluoroethylene copolymer;
Magnesium stearate, water reducing agent, hardening retarder, antifoaming agent, magnesium oxychloride, 3-glycidoxypropyltrimethoxysilane, polyvinyl ether-based smoothing agent, polyphenylene sulfide copolymer or cellulosic acetate propionate to 0.5 To 10% by weight; Wherein the hydrophilic fiber comprises at least one selected from the group consisting of polypropylene fiber, polyester fiber, nylon fiber and macro fiber, in an amount of 0.5 to 5 wt% based on the weight of the functional improving binder;
Wherein the fine aggregate comprises 60 to 99% by weight of silica silica, and 1 to 40% by weight of magnesite.
A surface modifier composition comprising 5 to 90% by weight of an inorganic filler and 10 to 95% by weight of a performance modifier in order to improve surface hardening and durability such as abrasion resistance, stain resistance, neutralization resistance, flame retardancy, freezing and thaw resistance, ultraviolet resistance, ;
Curing step;
The primer is at least one selected from styrene-butadiene, polyethylene methyl acrylate-butyl acrylate-butadiene copolymer, polyacrylic ester and acrylic emulsion;
Wherein the inorganic filler comprises 5 to 95% by weight of heavy calcium carbonate, 1 to 40% by weight of bogsite, 1 to 20% by weight of hafnium oxide, 1 to 20% by weight of beta-aluminum oxide, 1 to 20% by weight of gelite powder, 1 to 20% by weight;
Wherein the performance modifier comprises 20 to 99% by weight of methyl methacrylate-methyl acrylate-styrene copolymer, 0.3 to 35% by weight of novolak vinyl ester, 0.1 to 30% by weight of polybenzimidazole, 0.1 to 20% by weight of furfuryl alcohol, From 0.5 to 20% by weight of a polyether ketone;
A bending strength of 11.1 to 12.8 MPa, a compressive strength of 54.5 to 59.1 MPa, a standard conditional bonding strength of 2.2 to 2.4 MPa, an adhesion strength of 2.1 to 2.3 MPa after cold-cold repetition, a rate of change of length of 0.012 to 0.028% 0.3 to 0.2 g, a chloride ion penetration resistance of 300 to 420 Coulombs, a neutralization resistance of 0.11 to 0.2, a weight conversion ratio to hydrochloric acid of -0.8 to -0.45%, a weight conversion ratio to sulfuric acid of -0.02 to 0.15, A weight conversion rate of 0.5 to 1.1, a durability index of 92 to 94, a compressive strength of 43.0 to 49.3 kgf / cm ² in an alkaline test in a saturated calcium hydroxide solution, and a moisture permeation resistance of 0.2 to 0.4 m;
Repairing finishing method of concrete structures. delete delete delete delete delete