KR102144812B1 - Fiber mesh reinforcement composition for repair and reinforcement of concrete structure, fiber mesh for repair and reinforcement of concrete structure using the same, repair and reinforcement method of concrete structure using the fiber mesh and modified mortar for repair and reinforcement - Google Patents

Abstract

The present invention relates to a fiber mesh reinforcement composition having excellent strength and durability, and a repair and reinforcement method of a concrete structure using a modified mortar composition for repair and reinforcement and fiber mesh using the same. More particularly, the present invention relates to: a fiber mesh reinforcement composition having excellent strength, toughness, adhesion, durability, and particularly excellent nonflammability by using a modified filler and a performance-modified binder having excellent durability; reinforced fiber mesh having excellent workability using the same; and a repair and reinforcement method of a concrete structure using the fiber mesh and a modified mortar composition for repair and reinforcement.

Description

Fiber mesh reinforcement composition for repair and reinforcement of concrete structures, fiber mesh for repair and reinforcement of concrete structures using the same, repair and reinforcement method of concrete structures using the fiber mesh and modified mortar for repair and reinforcement {Fiber mesh reinforcement composition for repair and reinforcement of concrete structure, fiber mesh for repair and reinforcement of concrete structure using the same, repair and reinforcement method of concrete structure using the fiber mesh and modified mortar for repair and reinforcement}

The present invention relates to a fiber mesh reinforcing composition for repair and reinforcement of concrete structures, a fiber mesh for repair and reinforcement of concrete structures using the same, and a repair and reinforcement method for concrete structures using the fiber mesh and modified mortar for repair and reinforcement. will be.

In general, concrete or reinforced concrete structures are subject to external factors (impact, chemicals, seawater, etc.) or physical property deformation as time elapses, resulting in cracks, corrosion and delamination, exposure of reinforced bars, whitening, and sagging. In particular, the cracks that proceed in this way may cause the worst situation such as collapse, so reinforcement work is being performed in advance.

Reinforcement of a concrete structure needs to be dealt with precisely in terms of rebuilding the structure according to the purpose of use, and the behavior after reinforcement must be sufficiently considered.

On the other hand, since peeling of the structure surface or the occurrence of initial defects or cracks facilitates the movement of deterioration factors and promotes the progress of deterioration, in order to secure the stability and performance of reinforced concrete structures, repair and reinforcement are performed at the beginning of deterioration to further deteriorate. It is necessary to suppress progress and improve the durability performance.

Therefore, after removing the concrete part including the deterioration factor such as peeling or dropping of the structure section due to deterioration of concrete, corrosion of steel, or other causes, the section repair material may be filled to restore the section to its original performance and shape. It is common to perform repairs by spraying.

Conventional repair and reinforcement materials for cross-section restoration are mainly cement-based mortar or polymer cement mortar. These conventional repair and reinforcement materials are used for the purpose of suppressing the deterioration of the existing structure and improving the durability performance beyond the present. Since most of them focus only on improving the adhesion performance during construction, the surface is easily damaged again shortly after construction, so there is a problem that frequent repair/reinforcement work is required.

In addition, structurally damaged structures must be fully or partially repaired and reinforced to ensure safety, and as a repair and reinforcement method for concrete structures to solve these problems, steel materials are used outside of concrete structures with epoxy resin adhesive. Steel plate adhesive reinforcement method that adheres to the side, general repair and reinforcement mortar, reinforcement fiber adhesive method in which fiber-based reinforcing materials such as carbon fiber or glass fiber are manufactured in sheet form, plate form, mesh form, etc., and bonded to concrete structures, epoxy resin There is a method of bonding an epoxy panel manufactured by selectively adding a predetermined additive using as a base, or a method of pressing an epoxy resin into a cracked portion.

In the case of the steel plate adhesive reinforcement method, it is expected that materials can be purchased and the reinforcing effect can be realized. However, since the material itself is heavy, it is not easy to carry and handle, and it has disadvantages such as a fire hazard due to the use of fire such as welding.

In addition, the construction method using the general repair and reinforcement mortar has a problem in that it is difficult to ensure uniform rigidity of the structure.

In addition, since the epoxy resin itself has a weak resistance to ultraviolet rays, cracks are generated when exposed to the outside for a long period of time, and when a continuous impact load is applied, it may be ruptured by a brittle reaction. In particular, materials such as urethane were used in the repair and reinforcement construction of places requiring excellent waterproofness, such as the basement of a building with high humidity or a pier where running water is constantly in contact, but it was impossible to restore the rigidity of an already damaged structure.

Korean Patent Registration No. 10-1058157

As conceived to solve the above problems of the prior art, the present invention is excellent in strength, toughness, adhesion and durability by using a modified filler and a performance-modified binder with excellent durability, An object of the present invention is to provide a composition for reinforcing fiber mesh for reinforcement.

In addition, the present invention is manufactured by impregnating a composition for reinforcing fiber mesh for repair and reinforcement of the concrete structure, and chemical erosion of the inner and outer walls of concrete structures, overpasses, underground structures, waterborne structures, bridge structures, tunnel structures, etc. Its purpose is to provide a fiber mesh for repair and reinforcement of concrete structures that can prevent damage to concrete structures due to fire and can be constructed in any form due to its excellent flexibility.

In addition, an object of the present invention is to provide a repair and reinforcement method for a concrete structure using the fiber mesh and a modified mortar for repair and reinforcement excellent in strength and durability.

In order to achieve the above object, the present invention

A composition for reinforcing fiber mesh comprising 25 to 98% by weight of a performance-modified binder and 2 to 75% by weight of a modified filler,

The performance-modified binder is, based on a total of 100% by weight of the performance-modified binder, 40 to 94% by weight of unsaturated polyester, 1 to 20% by weight of alkyl acrylate-acrylonitrile copolymer, 1 to 20% by weight of frans resin, poly Including 1 to 20% by weight of chlorotrifluoroethylene, 0.5 to 20% by weight of a styrene-methyl methacrylate-butyl acrylate copolymer, and 0.5 to 20% by weight of polyethylene oxide,

The modified filler, based on the total 100% by weight of the modified filler, 5 to 94% by weight of barium sulfate, 1 to 30% by weight of gibbsite, 1 to 30% by weight of bauxite, 1 to 20% by weight of acid clay, Concrete comprising 0.5 to 20% by weight of silicon nitride, 0.5 to 20% by weight of zircoaluminate, 0.4 to 10% by weight of aluminum nitride, 0.4 to 10% by weight of sodium fluoride, and 0.2 to 10% by weight of halosite It provides a composition for reinforcing fiber mesh for repair and reinforcement of structures.

The performance-modified binder may further include 0.5 to 10% by weight of a copolymer represented by the following Formula 1, based on a total of 100% by weight of the performance-modified binder:

[Formula 1]

In the above formula, R1 and R2 are hydrogen or methyl groups,

a, b, c, and d are molar fractions, where a is 0.1 to 0.5, b is 0.1 to 0.5, c is 0.1 to 0.5, d is 0.1 to 0.5, and a+b+c+d=1.

The performance-modified binder is 0.01 to 10% by weight per component of at least one selected from polystyrene, methyl polyacrylate, propylethyltrimethoxysilane and polybutylene terephthalate, based on a total of 100% by weight of the performance-modified binder. It can be additionally included.

The performance-modified binder further includes 0.01 to 5% by weight of an antifoaming agent based on a total of 100% by weight of the performance-modified binder, and the antifoaming agent is an alcohol-based antifoaming agent, a polyethylene oxide-based antifoaming agent, a fatty acid-based antifoaming agent, an oil-based antifoaming agent, an ester-based antifoaming agent, or It may be an oxyalkylene-based antifoaming agent.

In addition, the present invention,

After impregnating the fiber mesh reinforcing composition for repair and reinforcement of the concrete structure of the present invention into at least one fiber selected from carbon fiber, polypropylene fiber, glass fiber, and aramid fiber, the impregnated fibers are alternately longitudinal and transverse. It provides a fiber mesh for repair and reinforcement of concrete structures manufactured in the shape of a grid or diamond by intersecting and stretching in a direction.

In addition, the present invention,

(1) removing and cleaning impurities, latencies, and deteriorated areas by grinding, chipping with a water jet or high pressure water washing machine;

(2) applying a surface layer strengthening agent to prevent penetration of foreign substances, water, etc. into the cleaned area and to provide surface layer strengthening, durability, and adhesion;

(3) drilling an anchor hole to attach the reinforcing fiber mesh to the applied area;

(4) installing a fiber mesh for repair and reinforcement of the concrete structure manufactured in the present invention using the perforated anchor hole;

(5) spraying a modified mortar composition for repair and reinforcement on the attached reinforcing fiber mesh to finish it; And

(6) applying a surface finishing agent for improving durability by preventing penetration of foreign substances such as water, chlorine ions, and carbon dioxide on the top of the finished surface; and

The modified mortar composition for repair and reinforcement

24 to 60% by weight of inorganic binder, 5 to 70% by weight of fine aggregate, 1 to 20% by weight of performance improvement admixture, and 5 to 25% by weight of water,

The inorganic binder is, based on a total of 100% by weight of the inorganic binder, crude steel Portland cement 20 to 80% by weight, amorphous calcium aluminate 3 to 40% by weight, acid clay 10 to 35% by weight, silicon nitride 1 to 25% by weight, zir 1 to 25% by weight of coaluminate, 0.1 to 15% by weight of gypsum, 1 to 10% by weight of aluminum nitride, 1 to 15% by weight of aluminosilicate, 0.5 to 10% by weight of sepiolite, 0.5 to 10% by weight of aluminum oxide, It contains 0.4 to 10% by weight of halosite, 0.4 to 10% by weight of hydrophilic fibers, and 0.2 to 10% by weight of a curing retardant,

The performance-improving admixture is, based on a total of 100% by weight of the performance-improving admixture, 35 to 95% by weight of polyethylene vinyl acetate, 1 to 45% by weight of ethylene-methyl methacrylate-vinyl acetate copolymer, and styrene-methyl methacrylate- Concrete, characterized in that it comprises 0.4 to 35% by weight of a butyl acrylate copolymer, 0.4 to 25% by weight of an alkyl acrylate-alkyl methacrylate copolymer, and 0.2 to 25% by weight of a methyl acrylate-vinyl acetate copolymer Provides structural repair and reinforcement methods.

The modified mortar composition for repair and reinforcement may further include 0.5 to 10% by weight of the copolymer represented by the following formula (1) as the performance-improving admixture:

[Formula 1]

In the above formula, R1 and R2 are hydrogen or methyl groups,

a, b, c, and d are molar fractions, where a is 0.1 to 0.5, b is 0.1 to 0.5, c is 0.1 to 0.5, d is 0.1 to 0.5, and a+b+c+d=1.

The surface layer strengthening agent is at least one selected from styrene-butadiene rubber (SBR), styrene-butadiene (SB) emulsion, polyacrylic ester (PAE), acrylic and ethylene vinyl acetate (EVA), and the surface finish is aqueous silica sol, It may be at least one selected from a urethane-acrylic emulsion, an acrylic emulsion, and a styrene-butadiene emulsion.

The performance-improving admixture further comprises 0.01 to 10% by weight of polyethylene glycol, 0.01 to 10% by weight of polyvinyl fluoride, 0.01 to 5% by weight of an antifoam, or 0.01 to 5% by weight of a water reducing agent, based on a total of 100% by weight of the performance improving admixture. Can include.

The curing retardant may be glucose, glucose, textrine, dextran, gluconic acid, malic acid, citric acid or acid salt thereof, aminocarboxylic acid or salt thereof, phosphonic acid or derivative thereof, or glycerin.

The fine aggregate may be composed of 75 to 99% by weight of silica silica and 1 to 25% by weight of bauxite.

The composition for reinforcing fiber mesh for repair and reinforcement of a concrete structure of the present invention provides an effect of greatly improving the strength, durability, toughness, adhesion, tensile strength and durability of the fiber mesh.

In addition, the fiber mesh for repair and reinforcement of a concrete structure of the present invention can be constructed regardless of the shape of the structure and thus has excellent workability, and has excellent strength, durability, toughness, adhesion, tensile strength and durability.

In addition, the repair and reinforcement method of a concrete structure of the present invention uses the fiber mesh and a modified mortar composition for repair and reinforcement having excellent physical properties such as strength and durability, so that concrete concrete and modified mortar for repair and reinforcement are integrated. As a result, even when vibration or impact occurs, cracks do not occur in the area where concrete concrete and reinforcing fiber mesh are attached, and it provides the effect of minimizing personal injury by prolonging the evacuation time by delaying the collapse time. In addition, since the grid-shaped reinforcing mesh is attached to the concrete structure by using the modified mortar composition for repair and reinforcement in which the mechanical binder is mixed, the integrated behavior with concrete concrete is possible and environmentally friendly and fire resistance can be expected. In addition, due to these characteristics, it effectively prevents damage due to normal and chemical erosion and fire due to neutralization, salt damage, waterproofing, freezing and thawing of civil structures such as bridges, tunnels, culverts, common tracts, and concrete structures such as underground structures and waterborne structures. And, by extending the lifespan, it provides the effect of remarkably reducing the maintenance cost used therein.

The composition for reinforcing fiber mesh of the present invention is largely composed of 2 to 75% by weight of a modified filler and 25 to 98% by weight of a performance modified binder.

The performance-modified binder functions to improve pot life, moldability, elasticity, fluidity, toughness and durability.

The performance-modifying binder of the present invention includes unsaturated polyester, acrylate alkyl ester-acrylonitrile copolymer, frans resin, polychlorotrifluoroethylene, and polyethylene oxide, and the unsaturated polyester has a function of improving strength and durability. , Acrylate alkyl ester-acrylonitrile copolymer has excellent ductility and functions to prevent explosion, franc resin has a function to improve fire resistance, and polychlorotrifluoroethylene improves chemical resistance, oil resistance, and heat resistance. And polyethylene oxide has a function of improving hygroscopicity.

In the present invention, as the acrylic acid alkyl ester-acrylonitrile copolymer, a copolymer known in the art may be used without limitation. For example, those having a weight average molecular weight of 100,000 to 2,000,000 may be used, and the molar ratio of the acrylate alkyl ester monomer and the acrylonitrile monomer may be 0.1 to 0.5: 0.1 to 0.5. The polychlorotrifluoroethylene may contain 2 to 4 chloro groups.

The performance-modified binder is, based on a total of 100% by weight of the performance-modified binder, 40 to 94% by weight of unsaturated polyester, 1 to 20% by weight of alkyl acrylate-acrylonitrile copolymer, 1 to 20% by weight of frans resin, poly 1 to 20% by weight of chlorotrifluoroethylene, 0.5 to 20% by weight of a styrene-methylmethacrylate-butylacrylate copolymer, and 0.5 to 20% by weight of polyethylene oxide.

The modified fillers include barium sulfate, gibbsite, bauxite, acid clay, silicon nitride, zircoaluminate, aluminum nitride, sodium fluoride, and halosite.

The modified filler, based on the total 100% by weight of the modified filler, 5 to 94% by weight of barium sulfate, 1 to 30% by weight of gibbsite, 1 to 30% by weight of bauxite, 1 to 20% by weight of acid clay, 0.5 to 20% by weight of silicon nitride, 0.5 to 20% by weight of zircoaluminate, 0.4 to 10% by weight of aluminum nitride, 0.4 to 10% by weight of sodium fluoride, and 0.2 to 10% by weight of halosite.

The barium sulfate is used to improve filling, impact resistance, heat retention and fire resistance. The barium sulfate is contained in 5 to 94% by weight based on the total 100% by weight of the modified filler, and when the content exceeds 94% by weight, performance is improved but workability is deteriorated, and when the content is less than 5% by weight, workability It is improved, but the effect of improving impact resistance, heat retention and fire resistance becomes weak.

The gibbsite has gray, gray-green, gray-red, etc., and is used to improve strength, abrasion resistance, and fire resistance. The gibbsite is contained in an amount of 1 to 30% by weight based on a total of 100% by weight of the modified filler. When the content of the gibbsite exceeds 30% by weight, manufacturing cost increases, which is not economical, and when the content is less than 1% by weight, the performance improvement effect is weak.

The bauxite is used to improve strength, durability, abrasion resistance, oxidation resistance, and fire resistance. The bauxite is contained in an amount of 1 to 30% by weight based on a total of 100% by weight of the modified filler. When the content is less than 1% by weight, the performance improvement effect is weak, and when the content exceeds 30% by weight, the performance is improved, but manufacturing cost is high, which is not economical.

The acid clay is used to improve adsorption performance and durability. The acid clay is contained in 1 to 20% by weight based on a total of 100% by weight of the modified filler. When the content is less than 1% by weight, the effect of improving performance is weak, and when the content of the acid clay exceeds 20% by weight, the performance is improved, but the viscosity is increased and the moldability is lowered.

The silicon nitride is used to improve strength, heat resistance, impact resistance and corrosion resistance. The silicon nitride is contained in an amount of 0.5 to 20% by weight based on a total of 100% by weight of the modified filler. When the content is less than 0.5% by weight, the performance improvement effect is weak, and when the content is more than 20% by weight, the performance is improved, but moldability and economy are deteriorated.

The zircoaluminate is used to improve corrosion resistance, adhesion, heat resistance, and the like. The zircoaluminate is preferably contained in 0.5 to 20% by weight based on the total 100% by weight of the modified filler, and when the content exceeds 20% by weight, heat resistance is improved but workability and strength are reduced, and the content is If it is less than 0.5% by weight, workability and strength may increase, but the flame retardant effect may be weak.

The aluminum nitride is used to improve hardness, wear resistance, and fire resistance. The aluminum nitride is contained in an amount of 0.4 to 10% by weight based on a total of 100% by weight of the modified filler. If the content is less than 0.4% by weight, the effect of improving hardness, abrasion resistance, and fire resistance becomes weak, and if the content exceeds 10% by weight, performance is improved, but moldability and economical efficiency may be deteriorated.

The sodium fluoride is used to prevent oxidation and corrosion. The sodium fluoride is contained in an amount of 0.4 to 10% by weight based on a total of 100% by weight of the modified filler. If the content is less than 0.4% by weight, the effect of preventing oxidation and corrosion is weak, and if the content is more than 10% by weight, curing may be accelerated and workability may be deteriorated.

The halosite is used to improve strength, fire resistance, abrasion resistance, and corrosion resistance. The halosite is contained in an amount of 0.2 to 10% by weight based on a total of 100% by weight of the modified filler. If the content of the halosite is less than 0.2% by weight, the effect of improving strength, fire resistance, abrasion resistance, and corrosion resistance becomes weak, and if the content of the halosite exceeds 10% by weight, no further performance improvement effect is expected, and price competitiveness decreases. I can.

The content of the performance-modified binder in the fiber mesh fiber mesh reinforcing composition of the present invention is used in an amount of 25 to 98% by weight. If the content exceeds 98% by weight, the viscosity is lowered, so that material separation is likely to occur, and price competitiveness may decrease. And if the content of the performance-modified binder is less than 25% by weight, the effect of improving pot life, workability, elasticity, fluidity, flame retardancy and durability becomes weak.

The performance-modifying binder is 40 to 94% by weight of unsaturated polyester, 1 to 20% by weight of alkyl acrylate-acrylonitrile copolymer, 1 to 20% by weight of frans resin, 1 to 20% by weight of polychlorotrifluoroethylene, styrene -Methyl methacrylate-butyl acrylate copolymer 0.5 to 20% by weight and 0.5 to 20% by weight of polyethylene oxide.

The unsaturated polyester is used to improve strength and durability. The unsaturated polyester is contained in an amount of 40 to 94% by weight based on a total of 100% by weight of the performance-modified binder. When the content is less than 40% by weight, the effect of improving strength and durability is weak, and when the content exceeds 94% by weight, it is difficult to expect further strength and durability improvement effects.

The acrylic acid alkyl ester-acrylonitrile copolymer is used to improve chemical resistance and water resistance. The acrylate alkyl ester-acrylonitrile copolymer is contained in 1 to 20% by weight based on the total 100% by weight of the performance-modified binder, and if the content exceeds 20% by weight, performance is improved but price competitiveness may be lowered, If the content is less than 1% by weight, the moldability is improved, but the effect of improving chemical resistance and water resistance is weak.

The Fran resin is used to improve strength, fire resistance, and durability. The fran resin is preferably contained in 1 to 20% by weight based on the total 100% by weight of the performance-modified binder.If the content exceeds 20% by weight, performance is improved but price competitiveness may be lowered, and the content is 1 If it is less than% by weight, the moldability is improved, but the effect of improving the performance is weak.

The polychlorotrifluoroethylene is used to improve corrosion resistance, heat resistance, impact resistance and electrical properties. The polychlorotrifluoroethylene is preferably contained in 1 to 20% by weight based on the total 100% by weight of the performance-modified binder.If the content of the polychlorotrifluoroethylene exceeds 20% by weight, the performance improvement effect is Although apparent, moldability is deteriorated, and when the content of the polychlorotrifluoroethylene is less than 1% by weight, the effect of improving performance is weak.

The styrene-methyl methacrylate-butyl acrylate copolymer is used to improve toughness and durability. The styrene-methyl methacrylate-butyl acrylate copolymer is preferably contained in an amount of 0.5 to 20% by weight based on the total 100% by weight of the performance-modified binder.If the content exceeds 20% by weight, performance is improved, but viscosity Is lowered to cause material separation, and if the content is less than 0.5% by weight, the performance improvement effect is insufficient. The styrene-methyl methacrylate-butyl acrylate copolymer may have a weight average molecular weight of 100,000 to 2,000,000, and may be used by purchasing a commercially available product. The molar ratio of each monomer of styrene, methyl methacrylate, and butyl acrylate may be 0.1 to 0.5: 0.1 to 0.5: 0.1 to 0.5.

The polyethylene oxide is used to improve tensile strength, hygroscopicity, material separation resistance, and chemical resistance. The polyethylene oxide is contained in 0.5 to 20% by weight based on the total 100% by weight of the performance-modified binder, and when the content exceeds 20% by weight, tensile strength, hygroscopicity, material separation resistance, and chemical resistance are improved, but moldability It may be reduced, and if the content of the polyethylene oxide is less than 0.5% by weight, the effect of improving the performance is insufficient.

The performance-modified binder may further include 0.5 to 10% by weight of a copolymer represented by the following Formula 1, based on a total of 100% by weight of the performance-modified binder:

[Formula 1]

In the above formula, R1 and R2 are hydrogen or methyl groups,

a, b, c, and d are molar fractions, where a is 0.1 to 0.5, b is 0.1 to 0.5, c is 0.1 to 0.5, d is 0.1 to 0.5, and a+b+c+d=1.

The copolymer represented by Formula 1 includes a catechol group and a methoxysilane group, includes a rubber group, and includes a 2-octyl cyanoacrylate monomer.

The catechol group is a functional group that adheres well to both organic and inorganic components. Therefore, the catechol group is well combined with the organic and inorganic materials contained in the lightweight binder, and performs a function of improving the strength and bonding strength of the binder. In addition, the silane group is a functional group that adheres well to both organic and inorganic components. Therefore, the catechol group and the silane group allow the fiber mesh to bind well with the mortar composition. In addition, the rubber group provides soft physical properties and performs a function of enhancing the flexibility of the fiber mesh. In addition, the 2-octylcyanoacrylate monomer functions to enhance the strength of the fiber mesh.

The copolymer represented by Formula 1 may have a weight average molecular weight of 50,000 to 5000,000, and more preferably 100,000 to 300,000.

The performance-modified binder may further include polystyrene to reduce shrinkage. The polystyrene is contained in an amount of 0.01 to 10% by weight based on a total of 100% by weight of the performance-modified binder. When the content exceeds 10% by weight, shrinkage is reduced, but strength decrease is liable to occur, and when the content is less than 0.01% by weight, the performance improvement effect is weak.

In addition, the performance-modified binder may further include methyl polyacrylate to improve strength, abrasion resistance, and chemical resistance. The methyl polyacrylate is contained in an amount of 0.01 to 10% by weight based on a total of 100% by weight of the performance-modified binder. If the content exceeds 10% by weight, strength, abrasion resistance, and chemical resistance are improved, but economic efficiency is lowered. If the content is less than 0.01% by weight, the effect of improving strength, abrasion resistance, and chemical resistance is weak.

In addition, the performance-modified binder may further include propylethyltrimethoxysilane in order to improve strength and durability. The propylethyltrimethoxysilane is mixed with 0.01 to 10% by weight based on the total 100% by weight of the performance-modified binder, and when the content exceeds 10% by weight, performance is improved, but moldability and price competitiveness may decrease, If the content is less than 0.01% by weight, the effect of improving strength and durability becomes weak.

In addition, the performance-modified binder may further include polybutylene terephthalate to improve adhesion and flame retardancy. The polybutylene terephthalate is contained 0.01 to 10% by weight based on the total 100% by weight of the performance-modified binder, and when the content exceeds 10% by weight, performance is improved but price competitiveness is lowered, and the content is less than 0.01% by weight. The workability of the composition for reinforcing fiber mesh on the back side is improved, but the effect of improving adhesion and fire resistance is weak.

The performance-modified binder may further include polystyrene to reduce shrinkage. The polystyrene is contained in an amount of 0.01 to 10% by weight based on a total of 100% by weight of the performance-modified binder. When the content exceeds 10% by weight, the shrinkage is reduced but strength decreases, and when the content is less than 0.01% by weight, the effect of improving the performance is weak.

The performance-modified binder may further include triphenylmethoxysilane to improve strength and durability by improving reactivity. The triphenylmethoxysilane is contained in an amount of 0.01 to 10% by weight based on a total of 100% by weight of the performance improving binder. If the content exceeds 10% by weight, strength and durability are improved, but economical efficiency is deteriorated, and if the content is less than 0.01% by weight, the effect of improving strength and durability becomes weak.

The performance-modified binder may further include a defoaming agent. The antifoaming agent is used to increase strength and durability by removing pores in the performance-modified binder. In addition, when the antifoaming agent is added to the performance-modified binder, it is possible to improve workability and pot life by providing an air entrainment effect. The antifoaming agent is contained in an amount of 0.01 to 5% by weight based on a total of 100% by weight of the performance improving admixture.

As the antifoaming agent, an alcohol-based antifoaming agent, a polyethylene oxide-based antifoaming agent, a fatty acid-based antifoaming agent, an oil-based antifoaming agent, an ester-based antifoaming agent, an oxyalkylene-based antifoaming agent, and the like may be used. Examples of the polyethylene oxide antifoaming agent include dimethyl polyethylene oxide oil, polyorganosiloxane, and fluoropolyethylene oxide oil. Examples of the fatty acid-based antifoaming agent include stearic acid and oleic acid. The oil-based antifoaming agent includes kerosene, animal and vegetable oil, castor oil, and the like. Examples of the ester-based antifoaming agent include solitol trioleate and glycerol monoricinolate. Examples of the oxyalkylene antifoaming agent include polyoxyalkylene, acetylene ethers, polyoxyalkylene fatty acid esters, and polyoxyalkylenealkylamines. Examples of the alcohol-based antifoaming agent include glycol.

In addition, the present invention relates to manufacturing a fiber mesh with improved strength and durability by using a fiber mesh reinforcing composition.

Specifically, the fiber mesh is impregnated with at least one fiber selected from carbon fiber, polypropylene fiber, glass fiber, and aramid fiber with a fiber mesh reinforcing composition for repair and reinforcement of the concrete structure, and then the impregnated fiber is alternately It is made into a lattice or diamond shape by intersecting it in the longitudinal and transverse directions and woven while stretching.

The impregnation may be performed for 10 minutes to 3 days, and may be dried through a drying process, or a weaving process may be performed in an undried state.

In addition, the manufacturing method of the fiber mesh can be used without limitation any method known in the art.

In addition, the present invention relates to a concrete structure repair and reinforcement method comprising the following steps.

(1) removing and cleaning impurities, latencies, and deteriorated areas by grinding, chipping with a water jet or high pressure water washing machine;

(2) applying a surface layer strengthening agent to prevent penetration of foreign substances, water, etc. into the cleaned area and to provide surface layer strengthening, durability, and adhesion;

(3) drilling an anchor hole to attach the reinforcing fiber mesh to the applied area;

(4) installing a fiber mesh for repair and reinforcement of the concrete structure manufactured in claim 5 using the perforated anchor hole;

(5) spraying a modified mortar composition for repair and reinforcement on the attached reinforcing fiber mesh to finish it; And

(6) Applying a surface finishing agent to improve durability by preventing penetration of foreign substances such as water, chlorine ions, and carbon dioxide on the top of the finished surface.

The modified mortar composition for repair and reinforcement

24 to 60% by weight of inorganic binder, 5 to 70% by weight of fine aggregate, 1 to 20% by weight of performance improvement admixture, and 5 to 25% by weight of water,

The inorganic binder is based on a total of 100% by weight of the inorganic binder, crude steel Portland cement 20 to 80% by weight, amorphous calcium aluminate 3 to 40% by weight, acid clay 10 to 35% by weight, silicon nitride 1 to 25% by weight, zir 1 to 25% by weight of coaluminate, 0.1 to 15% by weight of gypsum, 1 to 10% by weight of aluminum nitride, 1 to 15% by weight of aluminosilicate, 0.5 to 10% by weight of sepiolite, 0.5 to 10% by weight of aluminum oxide, It contains 0.4 to 10% by weight of halosite, 0.4 to 10% by weight of hydrophilic fibers, and 0.2 to 10% by weight of a curing retardant,

The performance-improving admixture is, based on a total of 100% by weight of the performance-improving admixture, 35 to 95% by weight of polyethylene vinyl acetate, 1 to 45% by weight of ethylene-methyl methacrylate-vinyl acetate copolymer, and styrene-methyl methacrylate- It may include 0.4 to 35% by weight of a butyl acrylate copolymer, 0.4 to 25% by weight of an acrylic acid alkyl ester-methacrylic acid alkyl ester copolymer, and 0.2 to 25% by weight of a methyl acrylate-vinyl acetate copolymer.

The performance-improving admixture is used to improve pot life, workability, fluidity, flexural strength, tensile strength, durability, flexural toughness, salt resistance, neutralization resistance, freeze-thaw resistance, and surface hardness.

The performance improving admixture is contained in 1 to 20% by weight based on a total of 100% by weight of the modified mortar composition for repair and reinforcement. When the content of the performance-improving admixture exceeds 20% by weight, the viscosity increases and workability decreases, and when the content is less than 1% by weight, flow performance, strength, durability, toughness, salt resistance, neutralization resistance, freeze-thaw resistance and surface The effect of improving the hardness becomes weak.

The performance-improving admixture is 35 to 95% by weight of polyethylene vinyl acetate, 1 to 45% by weight of ethylene-methylmethacrylate-vinyl acetate copolymer, and styrene-methylmethacrylate-butylacrylic based on 100% by weight of the total performance-improving admixture. Rate copolymer 0.4 to 35% by weight, acrylic acid alkyl ester-methacrylic acid alkyl ester copolymer 0.4 to 25% by weight, and methyl acrylate-vinyl acetate copolymer 0.2 to 25% by weight.

The performance-improving admixture may further include 0.01 to 10% by weight of polystyrene based on a total of 100% by weight of the performance-improving admixture.

In addition, the performance-improving admixture may further include 0.01 to 10% by weight of polyvinyl fluoride based on a total of 100% by weight of the performance-improving admixture.

In addition, the performance-improving admixture may further include 0.01 to 5% by weight of an antifoaming agent based on a total of 100% by weight of the performance-improving admixture.

In addition, the performance-improving admixture may further include 0.01 to 5% by weight of a water reducing agent based on a total of 100% by weight of the performance-improving admixture.

The polyethylene vinyl acetate is used to improve strength and durability. The polyethylene vinyl acetate is contained in an amount of 35 to 95% by weight based on a total of 100% by weight of the performance improving admixture. When the content of the polyethylene vinyl acetate exceeds 95% by weight, it is difficult to expect further strength and durability improvement effects, and when the content is less than 35% by weight, the effect of improving strength and durability performance is insufficient.

The ethylene-methyl methacrylate-vinyl acetate copolymer copolymer is used to improve abrasion resistance, chemical resistance, and heat resistance. The ethylene-methylmethacrylate-vinyl acetate copolymer copolymer is contained in an amount of 1 to 45% by weight based on a total of 100% by weight of the performance improving admixture. When the content of the ethylene-methyl methacrylate-vinyl acetate copolymer exceeds 45% by weight, it is difficult to expect further abrasion resistance, chemical resistance, and heat resistance improvement effects, and when the content is less than 1% by weight, abrasion resistance, chemical resistance, and heat resistance The improvement effect is insufficient.

The styrene-methyl methacrylate-butyl acrylate copolymer is used to improve toughness and durability. The styrene-methylmethacrylate-butylacrylate copolymer is preferably contained in an amount of 0.4 to 35% by weight based on the total 100% by weight of the performance-improving admixture.If the content exceeds 35% by weight, performance is improved but viscosity is This may result in material separation, and if the content is less than 0.4% by weight, the performance improvement effect is insufficient. The styrene-methyl methacrylate-butyl acrylate copolymer may have a weight average molecular weight of 100,000 to 2,000,000, and may be used by purchasing a commercially available product. The molar ratio of each monomer of styrene, methyl methacrylate, and butyl acrylate may be 0.1 to 0.5: 0.1 to 0.5: 0.1 to 0.5.

The acrylic acid alkyl ester-methacrylic acid alkyl ester copolymer is used to improve ductility, durability and weather resistance. The acrylic acid alkyl ester-methacrylic acid alkyl ester copolymer is preferably contained in an amount of 0.4 to 25% by weight based on a total of 100% by weight of the performance improving admixture.If the content exceeds 25% by weight, the performance is improved but the viscosity is increased. Workability decreases, and if the content is less than 0.4% by weight, the performance improvement effect is insufficient.

The methyl acrylate-vinyl acetate copolymer is used to improve chemical resistance, oil resistance, and ductility. The methyl acrylate-vinyl acetate copolymer is preferably contained in 0.2 to 25% by weight based on the total 100% by weight of the performance-improving admixture.If the content exceeds 25% by weight, the performance is improved, but the viscosity is increased, resulting in workability. It decreases, and if the content is less than 0.2% by weight, the effect of improving the performance is insufficient.

The performance-improving admixture may further include 0.5 to 10% by weight of a copolymer represented by the following Formula 1:

[Formula 1]

In the above formula, R1 and R2 are hydrogen or methyl groups,

a, b, c, and d are molar fractions, where a is 0.1 to 0.5, b is 0.1 to 0.5, c is 0.1 to 0.5, d is 0.1 to 0.5, and a+b+c+d=1.

The copolymer represented by Formula 1 includes a catechol group and a methoxysilane group, includes a rubber group, and includes a 2-octyl cyanoacrylate monomer.

The catechol group is a functional group that adheres well to both organic and inorganic components. Therefore, the catechol group is well combined with the organic and inorganic materials contained in the lightweight binder, and performs a function of improving the strength and bonding strength of the binder. In addition, the silane group is a functional group that adheres well to both organic and inorganic components. Therefore, the catechol group and the silane group enable the mortar composition to be well bonded with other mixed components such as the damaged surface of the damaged concrete structure and fiber mesh. In addition, the rubber group provides soft physical properties and performs a function of smoothly applying the mortar composition. In addition, the 2-octyl cyanoacrylate monomer performs a function of remarkably enhancing the reinforcing strength of the mortar composition.

The copolymer represented by Formula 1 may have a weight average molecular weight of 50,000 to 5000,000, and more preferably 100,000 to 300,000.

The performance improvement admixture may further include polystyrene to reduce shrinkage. The polystyrene is contained in an amount of 0.01 to 10% by weight based on a total of 100% by weight of the performance improvement admixture. When the content exceeds 10% by weight, the shrinkage is reduced but strength decreases, and when the content is less than 0.01% by weight, the effect of improving the performance is weak.

The performance-improving admixture may further include triphenylmethoxysilane in order to improve reactivity to improve strength and durability. The triphenylmethoxysilane is contained in an amount of 0.01 to 10% by weight based on a total of 100% by weight of the performance improvement admixture. If the content exceeds 10% by weight, strength and durability are improved, but economical efficiency is deteriorated, and if the content is less than 0.01% by weight, the effect of improving strength and durability becomes weak.

The modified mortar composition for repair and reinforcement may further include a defoaming agent. The antifoaming agent is used to increase strength and durability by removing air bubbles. The antifoaming agent is contained in an amount of 0.01 to 5% by weight based on a total of 100% by weight of the admixture for improving performance.

As the antifoaming agent, an alcohol-based antifoaming agent, a polyethylene oxide-based antifoaming agent, a fatty acid-based antifoaming agent, an oil-based antifoaming agent, an ester-based antifoaming agent, an oxyalkylene-based antifoaming agent, and the like may be used. Examples of the polyethylene oxide antifoaming agent include dimethyl polyethylene oxide oil, polyorganosiloxane, and fluoropolyethylene oxide oil. Examples of the fatty acid-based antifoaming agent include stearic acid and oleic acid. The oil-based antifoaming agent includes kerosene, animal and vegetable oil, castor oil, and the like. Examples of the ester-based antifoaming agent include solitol trioleate and glycerol monoricinolate. Examples of the oxyalkylene antifoaming agent include polyoxyalkylene, acetylene ethers, polyoxyalkylene fatty acid esters, and polyoxyalkylenealkylamines. Examples of the alcohol-based antifoaming agent include glycol.

The modified mortar composition for repair and reinforcement may further include a water reducing agent. The water reducing agent is used to reduce the water-cement ratio to improve strength and durability, and to secure the fluidity of the performance-improving admixture. Performance Improvement When a water reducing agent is added to the admixture, the high flow performance is improved. The water reducing agent is contained in an amount of 0.01 to 5% by weight based on a total of 100% by weight of the performance improving admixture.

The water reducing agent may be a polycarboxylic acid-based, polychlorotrifluoroethylene-based, or naphthalene-based water-reducing agent, but naphthalene-based and polychlorotrifluoroethylene-based water reducing agents may reduce the strength of the composition and workability (water-cement ratio) It is preferable to use a polycarboxylic acid-based water reducing agent that does not lower the strength and workability (water-cement ratio) of the composition because it can reduce the composition.

The inorganic binder used in the composition of the modified mortar for repair and reinforcement of the present invention exhibits initial strength, improves durability, suppresses temperature rise, improves flame retardancy, improves abrasion, etc., Contains 24 to 60% by weight based on a total of 100% by weight of the modified mortar composition for repair and reinforcement, and when the content exceeds 60% by weight, strength and durability are improved, but cracks occur due to the shrinkage and expansion effect, and the content If it is less than 24% by weight, workability and cracking are deteriorated, but the effect of improving strength and durability is insufficient.

The inorganic binder is 20 to 80% by weight of crude steel Portland cement, 3 to 40% by weight of amorphous calcium aluminate, 10 to 35% by weight of acid clay, 1 to 25% by weight of silicon nitride, zirco aluminum based on the total 100% by weight of the inorganic binder. 1 to 25% by weight of nate, 0.1 to 15% by weight of gypsum, 1 to 10% by weight of aluminum nitride, 1 to 15% by weight of aluminosilicate, 0.5 to 10% by weight of sepiolite, 0.5 to 10% by weight of aluminum oxide, halosite 0.4 to 10% by weight, 0.4 to 10% by weight of hydrophilic fibers, and 0.2 to 10% by weight of a curing retardant.

It is preferable to use the crude steel Portland cement specified in KS, and cement distributed in the general market may be used. The crude steel Portland cement is contained 20 to 80% by weight based on 100% by weight of the inorganic binder.

The amorphous calcium aluminate is an inorganic fast-hardening mineral material added to increase hydration reactivity and suppress cracking, and when it comes into contact with water, it reacts with water in an instant to produce ethringite hydrate, thereby mixing it with cement. When doing so, it makes it possible to obtain excellent compressive strength within a short time. The amorphous calcium aluminate is contained in an amount of 3 to 40% by weight based on 100% by weight of an inorganic binder. When the weight ratio of the amorphous calcium aluminate increases, it exhibits fast curing properties, but when the content exceeds 40% by weight, the manufacturing cost increases, which is not economical, and when the content is less than 3% by weight, it has the effect of improving strength and suppressing the occurrence of cracks. The effect becomes weak.

The acid clay is used for pozzolanic properties, long-term strength expression, and durability. When the weight ratio of the acid clay increases, the early strength decreases, but long-term strength and durability increase. The acid clay is contained 10 to 35% by weight based on 100% by weight of the inorganic binder. If the content exceeds 35% by weight, the initial strength expression is lowered, and if the content is less than 10% by weight, the long-term strength expression and durability improvement effect are weak.

The silicon nitride is used to improve water resistance, chemical resistance, fire resistance, and abrasion resistance. The silicon nitride is contained in an amount of 1 to 25% by weight based on 100% by weight of the inorganic binder. When the content is less than 1% by weight, the performance improvement effect is weak, and when the content is more than 25% by weight, the performance is improved, but moldability and economy are deteriorated.

The zircoaluminate is used to improve fire resistance and strength. The zircoaluminate is contained in an amount of 1 to 25% by weight based on 100% by weight of an inorganic binder, and when the content exceeds 25% by weight, flame retardancy is improved, but workability and strength are lowered, and when the content is less than 1% by weight Workability and strength increase, but the flame retardant effect becomes weak.

The gypsum (CaSO ₄ ) reacts with a component in the cement, especially C ₃ A (3CaO·Al ₂ O ₃ ) to initially generate ethrinzite (AFt phase, C ₃ A3·CaSO ₄ ·32H ₂ O). However, the amount of ethrinzite produced decreases as hydration proceeds, or a part of it 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, ethrinzite is sufficiently generated from the beginning to densify the structure of the cement, thereby increasing the penetration resistance to chloride ions in the early age. In addition, in the case of general cement, the generated ethrinzite is mainly present only at the beginning, but since the amount of gypsum is sufficiently added, a certain portion of ethrinzite is present or a part of ethrinzite is continuously produced even in long-term age. It is also possible. The ethrinzite produced in this way densely fills the voids in the concrete structure, thereby increasing the penetration resistance to chloride even in long-term age.

The gypsum is contained 0.1 to 15% by weight based on 100% by weight of the inorganic binder. When the weight ratio of the gypsum increases, it exhibits a fast hardening property, and when the gypsum content is less than 0.1% by weight, strength and workability may decrease, and when the gypsum content exceeds 15% by weight, it is due to the fast setting property. Good physical properties can be obtained, but it is not economical due to the high manufacturing cost.

The aluminum nitride is used to improve hardness, wear resistance, and fire resistance. The aluminum nitride is contained in an amount of 1 to 10% by weight based on 100% by weight of the inorganic binder. When the content of the aluminum nitride is less than 1% by weight, the effect of improving hardness, abrasion resistance, and fire resistance becomes weak, and when the content of the aluminum nitride exceeds 10% by weight, performance is improved, but moldability and economical efficiency are poor.

The aluminosilicate is used to improve strength, corrosion resistance and chemical resistance. The aluminosilicate is contained in an amount of 1 to 15% by weight based on 100% by weight of an inorganic binder. If the content is less than 1% by weight, workability is improved, but strength, corrosion resistance and chemical resistance may be deteriorated. If the content is more than 15% by weight, performance may be improved but workability may be reduced.

The sepiolite is used as a moisture absorbent to prevent material separation and to control viscosity. The sepiolite is contained in an amount of 0.5 to 10% by weight based on 100% by weight of the inorganic binder. If the content is less than 0.5% by weight, workability is good, but the effect of preventing material separation becomes weak, and if the content is more than 10% by weight, material separation does not occur, but the viscosity increases and workability decreases.

The aluminum oxide is used to prevent oxidation and corrosion. The aluminum oxide is contained 0.5 to 10% by weight based on 100% by weight of the inorganic binder. If the content is less than 0.01% by weight, the effect of preventing oxidation and corrosion is weak, and if the content is more than 10% by weight, curing is accelerated and workability is deteriorated.

The halosite is used to improve strength, fire resistance, abrasion resistance, and corrosion resistance. The halosite is contained in an amount of 0.4 to 10% by weight based on 100% by weight of the inorganic binder. If the content of the halosite is less than 0.4% by weight, the effect of improving strength, fire resistance, abrasion resistance, and corrosion resistance becomes weak, and if the content of the halosite exceeds 10% by weight, no further performance improvement effect is expected and price competitiveness is lowered. .

The surface layer strengthening agent is selected from styrene-butadiene rubber (SBR), styrene-butadiene (SB) emulsion, polyacrylic ester (PAE), acrylic and ethylene vinyl acetate (EVA) so that the modified mortar composition for repair and reinforcement is easily attached. At least any one can be used.

The surface finish may be at least one selected from an aqueous silica sol, a urethane-acrylic emulsion, a silane compound, and a composition for reinforcing the fiber mesh fiber mesh.

The hydrophilic fiber is used to prevent plastic cracking and improve toughness. As the hydrophilic fiber, any one of nylon fiber, polyethylene fiber, polypropylene fiber, and polyaramid fiber may be selected and used. The hydrophilic fiber is contained in an amount of 0.4 to 10% by weight based on 100% by weight of the inorganic binder. When the content of the hydrophilic fiber is less than 0.4% by weight, the effect of preventing cracking and improving toughness is weak, and when the content of the hydrophilic fiber exceeds 10% by weight, workability is deteriorated.

The curing retardant is used to delay rapid curing in order to secure workability for a certain period of time, and is contained in 0.2 to 10% by weight in the inorganic binder. As the curing retardant, generally well-known substances may be used, for example, sugars such as glucose, glucose, textulin, and dextran, acids such as gluconic acid, malic acid, citric acid, or salts thereof, aminocarboxylic acids or salts thereof, phosphonic acid. Alternatively, derivatives thereof, polyhydric alcohols such as glycerin, and the like can be used.

The fine aggregate used in the modified mortar composition for repair and reinforcement of the present invention may include siliceous silica sand and bauxite. The fine aggregate preferably contains 75 to 99% by weight of silica silica and 1 to 25% by weight of gelite.

In general, aggregates are classified into fine aggregates and coarse aggregates, and coarse aggregates mean aggregates with a particle diameter exceeding 5 mm, and fine aggregates mean aggregates with a particle diameter of 5 mm or less. In the present invention, by using a fine aggregate containing bauxite, strength, abrasion resistance, fire resistance, acidity, and durability against salt damage were improved.

It is preferable that the siliceous silica has a particle size of 4 to 6 (0.05 to 2.0 mm). When the particle size of the siliceous silica is larger than 2.0mm, the fluidity of the modified mortar composition for repairing and reinforcing is lowered, and when it is smaller than 0.05mm, the workability of the modified mortar composition for repairing and reinforcing is lowered. The siliceous silica sand is contained in an amount of 75 to 99% by weight based on the fine aggregate.

The gelite contains a germanium component, and is used to improve strength, abrasion resistance, and durability, and to impart antibacterial properties and anti-condensation properties. The gelite is contained in 1 to 25% by weight based on 100% by weight of the fine aggregate, and when the content exceeds 25% by weight, performance is improved but workability may be deteriorated, and when the content is less than 1% by weight, performance is improved. The effect becomes weak.

The modified mortar composition for repair and reinforcement of the present invention includes 3 to 65% by weight of an inorganic binder, 5 to 75% by weight of fine aggregate, and 0.01 to 25% by weight of a performance-improving admixture in a forced mixer or a vacuum mixer, and then water 1 to By adding 30% by weight, it can be prepared by mixing for a predetermined time (eg, 15 minutes) with a forced mixer or a continuous mixer.

As long as the various types of copolymers used in the present invention are prepared by polymerization including the corresponding monomer components, a copolymer known in the art or a copolymer prepared by a general method may be used without limitation. Specifically, each monomer constituting the copolymer may be composed of the same molar ratio, and a weight average molecular weight of 100,000 to 2,000,000 may be used.

The modified mortar composition for repair and reinforcement contains at least one selected from the compounds represented by the following Chemical Formula 2 and Chemical Formula 3 as a chloride ion penetration inhibitor for preventing salt damage, based on the total weight of the modified mortar composition for repair and reinforcement. May contain more in %.

[Formula 2]

The compound of Formula 2 may have a weight average molecular weight of 5,000 to 100,000, more preferably 5,000 to 20,000.

[Chemical Formula 3]

The compound of Formula 3 may have a weight average molecular weight of 5,000 to 100,000, more preferably 5,000 to 20,000.

The compounds of Formula 2 and Formula 3 have excellent features of fixing chlorine ions penetrating into the surface protection finish composition by including a tertiary amine group contained in the aromatic ring, and have excellent compatibility with other components as a polymer compound. Has.

The compounds represented by Formulas 2 and 3 may be purchased and used commercially in this field, or may be prepared and used by a method well known in the field.

An organic copper compound represented by the following Formula 4 may be further included in an amount of 0.01 to 3% by weight based on the total weight of the modified mortar composition for repair and reinforcement.

[Formula 4]

The compound of Formula 4 contains copper ions to fix chlorine ions penetrating into the lightweight panel. The compound of Formula 4 has very good ability to fix chlorine ions.

The compound of Formula 4 may be prepared, for example, by reacting a lithium ditrimethylsilaneamido compound with copper iodide in hexane water.

The compound of Formula 4 may be obtained, for example, by reacting lithium hexamethyldisilazide and copper iodide (I), and the lithium hexamethylsilazide is hexamethyldisilazane and n- It can be obtained by reacting butyllithium in hexane water. However, the present invention is not limited thereto, and can be easily obtained by a method known in the art (http://reag.paperplane.io/00000722.htm).

Hereinafter, the present invention will be described in more detail through examples. However, the following embodiments are provided so that the present invention may be sufficiently understood by those of ordinary skill in the art, and may be modified in various other forms, and the scope of the present invention is limited to the embodiments described below. It does not become.

Preparation Example 1: Preparation of the copolymer of formula 1

In ethylbenzene as a reaction solvent, 1,3-butadiene, dopamine methacrylamide, 3-(trimethoxysilyl)propyl methacrylate (3-(Trimethoxysilyl)propyl methacrylate), and 2-octylcyanoacryl The rate monomer was added in a molar ratio of 1:1:1:1, and 0.5 parts by weight of normal mercaptan was mixed with 100 parts by weight of the total monomer to make it uniform.

The polymerization solution prepared above was added to a 26 L reactor at a rate of 14 L/hr, polymerized at a temperature of 105°C in the first reactor, and polymerized at a temperature of 130°C in the second reactor, and the third reactor and the fourth When the polymerization conversion rate reached 75% by polymerization in the reactor at temperatures of 140°C and 145°C, the unreacted monomer and the reaction solvent were removed at 230°C in a volatilization tank, followed by washing, dehydration, and drying to have a weight average molecular weight of 165,000. A copolymer of the general formula 1 was obtained.

[Formula 1]

In the above formula, R1 and R2 are methyl groups,

a, b, c and d have a molar fraction of 1:1:1:1.

Example 1: Preparation of fiber mesh reinforcing composition for repair and reinforcement of concrete structures

Modified by mixing 75 kg of barium sulfate, 4 kg of gibsite, 4 kg of bauxite, 4 kg of acid clay, 4 kg of silicon nitride, 4 kg of zircoaluminate, 2 kg of aluminum nitride, 2 kg of sodium fluoride and 1 kg of halosite 100 kg of filler was obtained.

Separately, 85 kg of unsaturated polyester, 3 kg of alkyl acrylate-acrylonitrile copolymer, 3 kg of frans resin, 3 kg of polychlorotrifluoroethylene, 1 kg of styrene-methyl methacrylate-butyl acrylate copolymer, 1 kg of polyethylene oxide, 1 kg of polystyrene, 1 kg of polyacrylate, 1 kg of propylethyltrimethoxysilane, 1 kg of polybutylene terephthalate, and 1 kg of dimethyl polyethylene oxide oil as a defoaming agent were mixed to obtain 100 kg of a performance-modified binder. .

10 kg of the modified filler obtained above and 90 kg of the performance modified binder were added and stirred in a forced mixer for 2 minutes to obtain 100 kg of a fiber mesh fiber mesh reinforcing composition.

Example 2: Preparation of fiber mesh reinforcing composition for repair and reinforcement of concrete structures

70 kg of barium sulfate, 5 kg of gibbsite, 5 kg of bauxite, 5 kg of acid clay, 5 kg of silicon nitride, 5 kg of zircoaluminate, 2 kg of aluminum nitride, 2 kg of sodium fluoride, and 1 kg of halosite By mixing, 100 kg of modified filler was obtained.

Separately, unsaturated polyester 80 kg, acrylate alkyl ester-acrylonitrile copolymer 4 kg, Fran resin 4 kg, polychlorotrifluoroethylene 4 kg, styrene-methyl methacrylate-butyl acrylate copolymer 2 kg, 1 kg of polyethylene oxide, 1 kg of polystyrene, 1 kg of polyacrylate, 1 kg of propylethyltrimethoxysilane, 1 kg of polysulfone, and 1 kg of dimethyl polyethylene oxide oil as an antifoaming agent were mixed to obtain 100 kg of a performance-modifying binder.

10 kg of the modified filler obtained above and 90 kg of the performance modified binder were added and stirred in a forced mixer for 2 minutes to obtain 100 kg of a fiber mesh fiber mesh reinforcing composition.

Example 3: Preparation of fiber mesh reinforcement composition for repair and reinforcement of concrete structures

65 kg of barium sulfate, 6 kg of gibbsite, 6 kg of bauxite, 6 kg of acid clay, 6 kg of silicon nitride, 6 kg of zircoaluminate, 2 kg of aluminum nitride, 2 kg of sodium fluoride, and 1 kg of halosite By mixing, 100 kg of modified filler was obtained.

Separately, 73 kg of unsaturated polyester, 5 kg of alkyl acrylate-acrylonitrile copolymer, 5 kg of frans resin, 5 kg of polychlorotrifluoroethylene, 3 kg of styrene-methyl methacrylate-butyl acrylate copolymer, 2 kg of polyethylene oxide, 1 kg of polystyrene, 1 kg of polyacrylate, 1 kg of propylethyltrimethoxysilane, 1 kg of polysulfone, 1 kg of dimethyl polyethylene oxide oil as an antifoaming agent, the air represented by Formula 1 prepared in Preparation Example 1 2 kg of coalescence was mixed to obtain 100 kg of performance-modified binder.

10 kg of the modified filler obtained above and 90 kg of the performance-modified binder were added and stirred in a forced mixer for 2 minutes to obtain 100 kg of a composition for reinforcing fiber mesh fiber mesh.

Example 4: Preparation of fiber mesh for repair and reinforcement of concrete structures

After immersing 2 kg of aramid fiber mesh and 2 kg of glass fiber mesh in 10 kg of the fiber mesh fiber mesh reinforcing composition prepared in Example 1, the composition for reinforcing fiber mesh was impregnated while stretching by alternately crossing the longitudinal and transverse directions. A grid-like reinforcing fiber mesh was prepared.

Example 5: Preparation of fiber mesh for repair and reinforcement of concrete structures

After immersing 2 kg of aramid fiber mesh and 2 kg of glass fiber mesh in 10 kg of the fiber mesh fiber mesh reinforcing composition prepared according to Example 2, the fiber mesh reinforcing composition was alternately stretched by crossing it in the longitudinal direction and the transverse direction. Impregnated to prepare a grid-shaped reinforcing fiber mesh.

Example 6: Preparation of fiber mesh for repair and reinforcement of concrete structures

2 kg of aramid fiber mesh and 2 kg of glass fiber mesh were immersed in 10 kg of the fiber mesh fiber mesh reinforcing composition prepared according to Example 3, and then impregnated with the fiber mesh reinforcing composition while stretching by alternately crossing the longitudinal and transverse directions. To prepare a grid-shaped reinforcing fiber mesh.

[Comparative Example]

In order to compare the properties of the composition for reinforcing fiber mesh prepared according to Examples 1 to 3 of the present invention and the reinforcing fiber mesh prepared according to Examples 4 to 6 of the present invention, one component of the modified filler of the present invention and A composition for reinforcing fiber mesh and a reinforcing fiber mesh were prepared as a control using only one component of the performance-modified binder.

Comparative Example 1: Preparation of a control composition for reinforcing fiber mesh

10 kg of barium sulfate and 90 kg of unsaturated polyester were added and stirred in a forced mixer for 2 minutes to obtain 100 kg of a composition for reinforcing fiber mesh and fiber mesh.

Comparative Example 2: Preparation of control reinforcing fiber mesh

After impregnating 2 kg of aramid fiber mesh and 2 kg of glass fiber mesh in 10 kg of the fiber mesh fiber mesh reinforcing composition prepared in Comparative Example 1, a grid-shaped reinforcing fiber mesh was prepared while stretching by alternatingly crossing the longitudinal and transverse directions. .

[Experimental Example]

The following test examples show experimental results comparing the characteristics of the examples according to the present invention and the comparative examples so that the characteristics of Examples 1 to 6 according to the present invention can be more easily grasped.

Experimental Example 1: Strength and tensile performance test

Compositions for reinforcing fiber mesh prepared according to Examples 1 to 3 of the present invention, reinforcing fiber mesh prepared according to Examples 4 to 6, composition prepared according to Comparative Example 1, and prepared according to Comparative Example 2 In order to compare the physical properties of the reinforced fiber mesh, tensile strength tests were performed according to KS M 3015, compressive strength, flexural strength, and adhesion strength tests were performed according to KS M 3734, and flame retardancy tests were performed according to KS M 3015. And, for the reinforcing fiber mesh, tensile strength, tensile modulus and elongation were measured by KS M 3006, and the results are shown in Table 1 below.

Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2
burglar
(MPa) The tensile strength 39.0 40.3 42.0 - - - 35.0 - Compressive strength 98.0 101.0 108.2 - - - 93.0 - Flexural strength 35.0 37.2 39.3 - - - 31.8 - Adhesion strength 2.2 2.6 2.8 - - - 2.1 -
Tensile performance Tensile (MPa) - - - 4,150 4,195 4,280 - 4,000 Tensile modulus of elasticity (GPa) - - - 247.0 250.1 254.5 - 220.1 Elongation (%) - - - 2.3 2.5 3.1 - 2.0 Shear stress
(MPa) - - - 308.0 340.0 350.1 - 285.5

As shown in Table 1, the flexural, compressive, tensile, and adhesive strength of the composition for reinforcing fiber mesh prepared according to Examples 1 to 3 of the present invention was significantly higher than that of the control composition prepared according to Comparative Example 1. .

It was confirmed that the reinforcing fiber mesh prepared according to Examples 4 to 6 of the present invention was far superior in terms of tensile, tensile modulus and elongation compared to the control reinforcing fiber mesh prepared according to Comparative Example 2.

Experimental Example 2: Water absorption test

In the composition for reinforcing fiber mesh prepared according to Examples 1 to 3 of the present invention, the reinforcing fiber mesh prepared according to Examples 4 to 6, the control composition prepared according to Comparative Example 1, and Comparative Example 2 The measurement results of the water absorption rate of the control reinforcing fiber mesh prepared according to the method specified in KS M 3305 are shown in Table 2 below.

division Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Water absorption (%) 0.03 0.02 0.01 0.01 0.01 0.01 0.06 0.04

As shown in Table 2 above, the composition for reinforcing fiber mesh prepared according to Examples 1 to 3 of the present invention had a lower absorption rate compared to the control composition prepared according to Comparative Example 1.

The reinforcing fiber mesh prepared according to Examples 4 to 6 of the present invention had a lower absorption rate compared to the control reinforcing fiber mesh prepared according to Comparative Example 2.

Experimental Example 3: Chemical resistance test

In the composition for reinforcing fiber mesh prepared according to Examples 1 to 3 of the present invention, the reinforcing fiber mesh prepared according to Examples 4 to 6, the control composition prepared according to Comparative Example 1, and Comparative Example 2 According to the original Japanese Industrial Standard [Method for chemical resistance test by solution deposition of concrete], the test sample was immersed in an aqueous solution of 2% hydrochloric acid, 5% sulfuric acid and 45% sodium hydroxide as a test solution for 28 days. Thus, the measurement results of the chemical resistance test are shown in Table 3 below.

division Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Weight change rate
(%) Hydrochloric acid - - - - - - -0.7 -0.1 Sulfuric acid - - - - - - -0.2 - Sodium hydroxide - - - - - - 0 -

As shown in Table 3 above, the composition for reinforcing fiber mesh prepared according to Examples 1 to 3 of the present invention exhibited less weight change rate for chemical resistance compared to the control composition prepared according to Comparative Example 1. It was confirmed that resistance to chemicals was high.

The reinforcing fiber mesh prepared according to Examples 4 to 6 of the present invention showed less weight change rate for chemical resistance compared to the control reinforcing fiber mesh prepared according to Comparative Example 2, confirming that resistance to chemical resistance was high. Could

Experimental Example 4: Weight change rate, temperature deviation, appearance test

In the composition for reinforcing fiber mesh prepared according to Examples 1 to 3 of the present invention, the reinforcing fiber mesh prepared according to Examples 4 to 6, the control composition prepared according to Comparative Example 1, and Comparative Example 2 Table 4 below shows the measurement results of the nonflammability test for the control reinforcing fiber mesh prepared according to the method specified in KS F ISO 1182. Table 4 shows the results of observing the weight change rate, temperature deviation, and appearance state after the test of each of the Examples and Comparative Examples according to the non-flammability test. The standard of KS standard is less than 30% of weight change and less than 20K of temperature deviation.

division Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Weight change rate
(%) 7.8 7.5 7.2 7.2 6.9 6.3 12.0 9.6 Temperature deviation (K) 2.1 1.9 1.8 1.8 1.7 1.6 10.0 4.9 Appearance after test No change No change No change No change No change No change No change No change

As shown in Table 4 above, the composition for reinforcing fiber mesh prepared according to Examples 1 to 3 of the present invention has a significantly higher non-combustibility compared to the control composition prepared according to Comparative Example 1, so that the non-flammability is improved. Could know.

The reinforcing fiber mesh prepared according to Examples 4 to 6 of the present invention has a significantly higher non-combustibility compared to the control reinforcing fiber mesh prepared according to Comparative Example 2.

Example 7: Preparation of modified mortar composition for repair and reinforcement

Polyethylene vinyl acetate 93 kg, ethylene-methyl methacrylate-vinyl acetate copolymer 1 kg, styrene-methyl methacrylate-butyl acrylate copolymer 1 kg, acrylate alkyl ester-alkyl methacrylate copolymer 1 kg, methyl An acrylate-vinyl acetate copolymer 1 kg, polyethylene glycol 1 kg, polyvinyl fluoride 1 kg, dimethyl polyethylene oxide oil 0.5 kg as a defoaming agent, and a polyethercarboxylic acid polymer compound 0.5 kg as a water reducing agent were mixed to prepare 100 kg of a performance improvement admixture. Got it.

Crude Portland cement 75 kg, amorphous calcium aluminate 5 kg, acid clay 10 kg, silicon nitride 3 kg, zirco aluminate 2 kg, gypsum 1 kg, aluminum nitride 1 kg, aluminosilicate 1 kg, sepiolite 0.5 kg, 0.5 kg of aluminum oxide, 0.4 kg of halosite, 0.4 kg of nylon fiber as a hydrophilic fiber, and 0.2 kg of citric acid as a curing retardant were mixed to obtain 100 kg of an inorganic binder.

42 kg of the inorganic binder obtained above, 48 kg of a mixture of siliceous silica and gelite as fine aggregate (mixing weight ratio 8:2) and 4 kg of a performance-improving admixture were premixed in a forced mixer, and then 6 kg of water was added. By stirring for 2 minutes, 100 kg of a modified mortar composition for repair and reinforcement was prepared.

Example 8: Preparation of modified mortar composition for repair and reinforcement

Polyethylene vinyl acetate 87 kg, ethylene-methyl methacrylate-vinyl acetate copolymer 2 kg, styrene-methyl methacrylate-butyl acrylate copolymer 2 kg, acrylate alkyl ester-alkyl methacrylate copolymer 2 kg, methyl 2 kg of acrylate-vinyl acetate copolymer, 2 kg of polyethylene glycol, 2 kg of polyvinyl fluoride, 0.5 kg of dimethyl polyethylene oxide oil as a defoaming agent, and 0.5 kg of a polyethercarboxylic acid polymer compound as a water reducing agent were mixed to prepare 100 kg of a performance-modifying binder. Got it.

Crude Portland cement 70 kg, amorphous calcium aluminate 8 kg, acid clay 10 kg, silicon nitride 5 kg, zirco aluminate 2 kg, gypsum 1 kg, aluminum nitride 1 kg, aluminosilicate 1 kg, sepiolite 0.5 kg, 0.5 kg of aluminum oxide, 0.4 kg of halosite, 0.4 kg of nylon fiber as a hydrophilic fiber, and 0.2 kg of citric acid as a curing retardant were mixed to obtain 100 kg of an inorganic binder.

40 kg of the inorganic binder obtained above, 50 kg of a mixture of siliceous silica and gelite as fine aggregate (mixing weight ratio 8:2), and 4 kg of the performance-improving admixture obtained above were premixed in a forced mixer, and then 6 kg of water It was added and stirred for 2 minutes to prepare 100 kg of a modified mortar composition for repair and reinforcement.

Example 9: Preparation of modified mortar composition for repair and reinforcement

Polyethylene vinyl acetate 77.5 kg, ethylene-methyl methacrylate-vinyl acetate copolymer 3 kg, styrene-methyl methacrylate-butyl acrylate copolymer 3 kg, acrylate alkyl ester-alkyl methacrylate copolymer 3 kg, methyl 3 kg of acrylate-vinyl acetate copolymer, 3 kg of polyethylene glycol, 3 kg of polyvinyl fluoride, 0.5 kg of dimethyl polyethylene oxide oil as an antifoaming agent and 0.5 kg of a polyethercarboxylic acid polymer compound as a water reducing agent, Formula 1 prepared in Preparation Example 1 2 kg of a copolymer represented by, 0.5 kg of a compound represented by Formula 2, 0.5 kg of a compound represented by Formula 3, and 0.5 kg of a compound represented by Formula 4 were mixed to obtain 100 kg of a performance improving admixture.

Crude Portland cement 65 kg, amorphous calcium aluminate 10 kg, acid clay 10 kg, silicon nitride 7 kg, zirco aluminate 3 kg, gypsum 1 kg, aluminum nitride 1 kg, aluminosilicate 1 kg, sepiolite 0.5 kg, 0.5 kg of aluminum oxide, 0.4 kg of halosite, 0.4 kg of nylon fiber as a hydrophilic fiber, and 0.2 kg of citric acid as a curing retardant were mixed to obtain 100 kg of an inorganic binder.

50 kg of the inorganic binder obtained above, 400 kg of a mixture of siliceous silica and gelite as fine aggregate (mixing weight ratio 8:2), and 4 kg of the performance-improving admixture obtained above were premixed in a forced mixer, and then 6 kg of water It was added and stirred for 2 minutes to prepare 100 kg of a modified mortar composition for repair and reinforcement.

[Formula 2]

Weight average molecular weight 5,000 to 20,000

[Chemical Formula 3]

The compound of Formula 3 has a weight average molecular weight of 5,000 to 20,000

[Formula 4]

Comparative Example 3: Preparation of modified mortar composition for repair and reinforcement

Usually 42 kg of Portland cement and 48 kg of fine aggregate were stirred in a forced mixer for 2 minutes, then 10 kg of water was added and stirred for 2 minutes to prepare 100 kg of a control cement mortar composition.

Comparative Example 4: Preparation of modified mortar composition for repair and reinforcement

Usually, 42 kg of Portland cement, 48 kg of fine aggregate, and 4 kg of polyethylene vinyl acetate were premixed in a forced mixer, then 6 kg of water was added and stirred for 2 minutes to prepare 100 kg of a polymer cement mortar composition.

Experimental Example 5: Measurement of compression, bending, and adhesive strength

The modified mortar composition for repair and reinforcement prepared according to Examples 7 to 9 of the present invention and the mortar prepared according to Comparative Examples 3 and 4 were specified in KS F 4042 (polymer cement mortar for repairing concrete structures). According to the method, compression, bending and adhesive strength were measured, and the results are shown in Table 5 below.

division
Compressive strength (N/mm ² ) Flexural strength (N/mm ² ) Adhesive strength (N/mm ² ) Example 7 56.2 10.5 2.1 Example 8 58.5 11.3 2.2 Example 9 63.2 13.5 2.9 Comparative Example 3 47.0 6.2 1.4 Comparative Example 4 49.2 9.8 1.9

As shown in Table 5 above, the modified mortar composition for repair and reinforcement prepared according to Examples 7 to 9 of the present invention had significantly higher compressive strength compared to the control mortar prepared according to Comparative Examples 3 and 4 .

Test Example 6: Measurement of length change rate

The modified mortar composition for repair and reinforcement prepared according to Examples 7 to 9 of the present invention and the control mortar prepared according to Comparative Examples 3 and 4 were used in KS F 4042 (polymer cement mortar for repairing concrete structures). By measuring the rate of change in length, the results are shown in Table 6 below.

division Example 7 Example 8 Example 9 Comparative Example 3 Comparative Example 4 Length change rate (%) 0.005 0.004 0.003 0.11 0.02

As shown in Table 6 above, the modified mortar composition for repair and reinforcement prepared according to Examples 7 to 9 of the present invention has a reduced length change rate compared to the control mortar prepared according to Comparative Examples 3 and 4 It was confirmed that there is a shrinkage reduction effect.

Experimental Example 7: Water permeability

The modified mortar composition for repair and reinforcement prepared according to Examples 7 to 9 of the present invention and the control mortar prepared according to Comparative Examples 3 and 4 were used in KS F 4042 (polymer cement mortar for repairing concrete structures). Table 7 shows the measurement results of the water permeability test according to the prescribed method.

division Example 7 Example 8 Example 9 Comparative Example 3 Comparative Example 4 Water permeability (g) 2.0 1.5 0.9 9.5 3.0

As shown in Table 7 above, the modified mortar composition for repair and reinforcement prepared according to Examples 7 to 9 of the present invention has a lower absorption rate compared to the control mortar prepared according to Comparative Examples 3 and 4 It was found that the water resistance was excellent.

Experimental Example 8: Depth of neutralization

The modified mortar composition for repair and reinforcement prepared according to Examples 7 to 9 of the present invention and the control mortar prepared according to Comparative Examples 3 and 4 were used in KS F 4042 (polymer cement mortar for repairing concrete structures). The test was carried out, and the results are shown in Table 8 below.

division Example 7 Example 8 Example 9 Comparative Example 3 Comparative Example 4 Neutralization depth (mm) 0.3 0.25 0.11 2.3 0.7

As shown in Table 8 above, the modified mortar composition for repair and reinforcement prepared according to Examples 7 to 9 of the present invention has a neutralization penetration depth compared to the control mortar prepared according to Comparative Examples 3 and 4 It could be confirmed that the resistance to neutralization was high.

Experimental Example 9: Chloride ion penetration resistance

The modified mortar composition for repair and reinforcement prepared according to Examples 7 to 9 of the present invention and the control mortar prepared according to Comparative Examples 3 and 4 were used in KS F 4042 (polymer cement mortar for repairing concrete structures). The chloride ion penetration resistance test was performed, and the results are shown in Table 9 below.

division Example 7 Example 8 Example 9 Comparative Example 3 Comparative Example 4 Chloride ion penetration resistance (coulombs) 700 621 325 1,320 890

As shown in Table 9 above, the modified mortar composition for repair and reinforcement prepared according to Examples 7 to 9 of the present invention penetrates chloride ions compared to the control mortar prepared according to Comparative Examples 3 and 4 It was confirmed that the resistance was low, indicating that the resistance to salt damage was high.

Experimental Example 10: Alkali resistance, water absorption coefficient and moisture permeation resistance

The modified mortar composition for repair and reinforcement prepared according to Examples 7 to 9 of the present invention and the control mortar prepared according to Comparative Examples 3 and 4 were used in KS F 4042 (polymer cement mortar for repairing concrete structures). Alkali resistance, water absorption coefficient, and moisture permeation resistance tests were performed, and the results are shown in Table 10 below.

division Example 7 Example 8 Example 9 Comparative Example 3 Comparative Example 4 Alkali resistance (MPa) 46.2 48.1 49.8 31.0 42.3 Water absorption coefficient (kg/m ² ㆍh ^0.5 ) 0.28 0.23 0.19 0.55 0.31 Moisture permeation resistance (Sd, m) 1.2 1.0 0.9 2.0 1.7

As shown in Table 10 above, it was found that the modified mortar composition for repair and reinforcement prepared according to Examples 7 to 9 of the present invention has superior performance compared to the mortar prepared according to Comparative Examples 3 and 4. Could

Experimental Example 11: Freeze-thaw resistance

Freeze-thawing resistance test of the modified mortar composition for repair and reinforcement prepared according to Examples 7 to 9 of the present invention and the control mortar prepared according to Comparative Examples 3 and 4 according to the method specified in KS F 2456 And the results are shown in Table 11 below. Freeze-thawing refers to freezing and melting of moisture absorbed in concrete. If freeze-thawing is repeated, fine cracks occur in the concrete structure, resulting in a problem of deteriorating durability.

division Example 7 Example 8 Example 9 Comparative Example 3 Comparative Example 4 Durability index 94 95 99 71 91

As shown in Table 11 above, the modified mortar composition for repair and reinforcement prepared according to Examples 7 to 9 of the present invention has a significantly higher durability index compared to the mortar prepared according to Comparative Examples 3 and 4. Therefore, it can be seen that the durability is improved.

Experimental Example 12: Chemical resistance

The modified mortar composition for repair and reinforcement prepared according to Examples 7 to 9 of the present invention and the control mortar prepared according to Comparative Examples 3 and 4 were prepared in the original Japanese Industrial Standard [Chemical resistance by solution deposition of concrete Test Method], the test sample was immersed in an aqueous solution of 2% hydrochloric acid, 5% sulfuric acid and 45% sodium hydroxide as a test solution for 28 days, and the measurement results of the chemical resistance test are shown in Table 12 below.

division Example 7 Example 8 Example 9 Comparative Example 3 Comparative Example 4 Weight change rate
(%) Hydrochloric acid -0.9 -0.7 -0.5 -4.0 -1.2 Sulfuric acid -0.04 0 0 -2.0 -0.1 Sodium hydroxide +0.2 +0.8 +1.0 -0.1 0.1

As shown in Table 12 above, the modified mortar composition for repair and reinforcement prepared according to Examples 7 to 9 of the present invention was compared to the mortar prepared according to Comparative Examples 3 and 4, the weight change rate for chemical resistance It was confirmed that the resistance to chemical resistance was high, which appeared less.

In the above, although the preferred embodiment of the present invention has been described in detail, the present invention is not limited to the above embodiment, and various modifications by those of ordinary skill in the art within the scope of the technical idea of the present invention This is possible.

Claims (11)

A composition for reinforcing fiber mesh comprising 25 to 98% by weight of a performance-modified binder and 2 to 75% by weight of a modified filler,
The performance-modified binder is, based on a total of 100% by weight of the performance-modified binder, 40 to 94% by weight of unsaturated polyester, 1 to 20% by weight of alkyl acrylate-acrylonitrile copolymer, 1 to 20% by weight of frans resin, poly Including 1 to 20% by weight of chlorotrifluoroethylene, 0.5 to 20% by weight of a styrene-methyl methacrylate-butyl acrylate copolymer, and 0.5 to 20% by weight of polyethylene oxide,
The modified filler, based on the total 100% by weight of the modified filler, 5 to 94% by weight of barium sulfate, 1 to 30% by weight of gibbsite, 1 to 30% by weight of bauxite, 1 to 20% by weight of acid clay, Concrete comprising 0.5 to 20% by weight of silicon nitride, 0.5 to 20% by weight of zircoaluminate, 0.4 to 10% by weight of aluminum nitride, 0.4 to 10% by weight of sodium fluoride, and 0.2 to 10% by weight of halosite Fiber mesh reinforcement composition for repair and reinforcement of structures. The repair and reinforcement of a concrete structure according to claim 1, wherein the performance-modified binder further comprises 0.5 to 10% by weight of a copolymer represented by the following Formula 1, based on a total of 100% by weight of the performance-modified binder. Composition for reinforcing fiber mesh for:
[Formula 1]

In the above formula, R1 and R2 are hydrogen or methyl groups,
a, b, c, and d are molar fractions, where a is 0.1 to 0.5, b is 0.1 to 0.5, c is 0.1 to 0.5, d is 0.1 to 0.5, and a+b+c+d=1. The method of claim 2, wherein the performance-modified binder contains 0.01 to 10% by weight of polystyrene, methyl polyacrylate, propylethyltrimethoxysilane and polybutylene terephthalate per component, based on a total of 100% by weight of the performance-modified binder. Fiber mesh reinforcement composition for repair and reinforcement of a concrete structure, characterized in that it further comprises as. 4. , An ester-based antifoaming agent, or an oxyalkylene-based antifoaming agent, a composition for reinforcing fiber mesh for repair and reinforcement of concrete structures. After impregnating at least one fiber selected from carbon fiber, polypropylene fiber, glass fiber, and aramid fiber with the fiber mesh reinforcing composition for repair and reinforcement of a concrete structure according to any one of claims 1 to 4, the impregnated fiber Fiber mesh for repair and reinforcement of concrete structures manufactured in a lattice or diamond shape by intersecting and tensioning by alternating in the longitudinal and transverse directions. (1) removing and cleaning impurities, latencies, and deteriorated areas from the concrete structure by grinding, chipping with a water jet or high pressure water washer;
(2) applying a surface layer strengthening agent to prevent penetration of foreign substances and water into the cleaned area, and to provide surface layer strengthening, durability and adhesion;
(3) drilling an anchor hole to attach the reinforcing fiber mesh to the applied area;
(4) installing a fiber mesh for repair and reinforcement of the concrete structure manufactured in claim 5 using the perforated anchor hole;
(5) spraying a modified mortar composition for repair and reinforcement on the attached reinforcing fiber mesh to finish it; And
(6) applying a surface finishing agent for improving durability by preventing the penetration of foreign substances such as water, chlorine ions and carbon dioxide on the top of the finished surface; and
The modified mortar composition for repair and reinforcement
24 to 60% by weight of inorganic binder, 5 to 70% by weight of fine aggregate, 1 to 20% by weight of performance improvement admixture, and 5 to 25% by weight of water,
The inorganic binder is, based on a total of 100% by weight of the inorganic binder, crude steel Portland cement 20 to 80% by weight, amorphous calcium aluminate 3 to 40% by weight, acid clay 10 to 35% by weight, silicon nitride 1 to 25% by weight, zir 1 to 25% by weight of coaluminate, 0.1 to 15% by weight of gypsum, 1 to 10% by weight of aluminum nitride, 1 to 15% by weight of aluminosilicate, 0.5 to 10% by weight of sepiolite, 0.5 to 10% by weight of aluminum oxide, It contains 0.4 to 10% by weight of halosite, 0.4 to 10% by weight of hydrophilic fibers, and 0.2 to 10% by weight of a curing retardant,
The performance-improving admixture is 35 to 95% by weight of polyethylene vinyl acetate, 1 to 45% by weight of ethylene-methylmethacrylate-vinyl acetate copolymer, and styrene-methylmethacrylate- Concrete comprising 0.4 to 35% by weight of a butyl acrylate copolymer, 0.4 to 25% by weight of an alkyl acrylate-alkyl methacrylate copolymer, and 0.2 to 25% by weight of a methyl acrylate-vinyl acetate copolymer Structure repair and reinforcement method. The method of claim 6, wherein the modified mortar composition for repair and reinforcement further comprises 0.5 to 10% by weight of the copolymer represented by the following formula (1) as the performance improving admixture:
[Formula 1]

In the above formula, R1 and R2 are hydrogen or methyl groups,
a, b, c, and d are molar fractions, where a is 0.1 to 0.5, b is 0.1 to 0.5, c is 0.1 to 0.5, d is 0.1 to 0.5, and a+b+c+d=1. The method of claim 7, wherein the surface strengthening agent is at least one selected from styrene-butadiene rubber (SBR), styrene-butadiene (SB) emulsion, polyacrylic ester (PAE), acrylic and ethylene vinyl acetate (EVA), and the surface finish A concrete structure repair and reinforcement method, characterized in that I am at least one selected from aqueous silica sol, urethane-acrylic emulsion, acrylic emulsion, and styrene-butadiene emulsion. The method of claim 6, wherein the performance-improving admixture is 0.01 to 10% by weight of polyethylene glycol, 0.01 to 10% by weight of polyvinyl fluoride, 0.01 to 5% by weight of an antifoaming agent, or a water reducing agent based on a total of 100% by weight of the performance improving admixture. Repair and reinforcement method of a concrete structure, characterized in that it further comprises 0.01 to 5% by weight. The concrete structure according to claim 9, wherein the curing retardant is glucose, glucose, textrin, dextran, gluconic acid, malic acid, citric acid or an acid salt thereof, aminocarboxylic acid or salt thereof, phosphonic acid or a derivative thereof, or glycerin. Repair and reinforcement method. The method of claim 6, wherein the fine aggregate is composed of 75 to 99% by weight of siliceous silica and 1 to 25% by weight of bauxite.