KR101978636B1 - Repairing and reinforcing method of crack and damage part for concrete structure - Google Patents

Abstract

The present invention relates to a complex reinforcement method for cracked and damaged parts of an outer wall of a concrete structure, capable of forming a dense and highly elastic putty layer. According to the present invention, the complex reinforcement method comprises: (A) a base pretreatment step; (B) a primer coating step; (C) a high-strength mortar reinforcement step of filling a grooved portion side of a concrete structure with high-strength pressing mortar to reinforce the portion side; (D) a high-elasticity putty coating step of coating highly elastic putty on the portion side to form a highly elastic putty layer; and (E) a water-based paint coating step.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of reinforcing concrete,

The present invention relates to a composite reinforcing method for cracking and breakage of an outer wall of a concrete structure, and more particularly, to a method for reinforcing a reinforced concrete structure, And to provide an eco-friendly reinforcement method capable of maintaining the stability on the repair and reinforcement site even in the event of contraction or expansion of the concrete structure due to seasonal changes, and to a method for reinforcing cracks and cracks in the outer wall of a concrete structure.

In general, concrete is widely used as a construction material for semi-permanent structures due to its excellent durability and is being used to construct various structures for providing convenience to human life such as dams, bridges, paved roads and tunnels including houses and apartments.

However, various types of concrete structures constructed with concrete are cracked due to factors such as drying shrinkage during curing due to the characteristics of the material of the concrete, and the stresses due to immersion, bleeding or self- Large and small cracks occur due to various factors such as overage.

Also, when exposed to the marine environment for a long time, the concrete structure is eroded by the action of seawater, corrosion of the reinforcing steel occurs, cracking and peeling of the concrete due to volume expansion causes deterioration of the performance of the concrete structure, Concrete may be damaged due to freezing and thawing, and if it is exposed to automobile exhaust gas for a long period of time, the concrete may be cracked or broken as well as corrosion of the inner reinforcing steel due to the neutralization phenomenon.

These cracks affect the structural safety of the concrete structure depending on the location of the crack and the width and depth of the crack, and may cause deterioration through rebar corrosion or deteriorate durability.

In addition to these factors, the reinforcing bars may be corroded and the concrete may be damaged by the neutralization of the concrete structure, the reaction of the alkali aggregate, and the chemical erosion, which causes problems such as appearance damage and deterioration of the waterproof performance.

Conventionally, in order to improve the durability while maintaining the stability of the concrete structure when the inner reinforcing steel is corroded and the concrete is cracked or broken due to various factors, the crack repairing material is injected into the crack or damage site, putty) material to repair and reinforce the method is mainly used.

However, the conventional method of repairing and reinforcing the cracked or damaged portion of the concrete structure using the putty material is not limited to the repair or reinforcement side adhesion of the putty material, and also the adhesion to the outermost coat layer And there was a problem in preventing the corrosion of the reinforcing bars.

In addition, conventionally, a method of repairing mainly using putty which is a bonding agent for a common outer wall such as a butyl tape is used. When a butyl tape is used, due to contraction and expansion of a concrete structure due to seasonal changes, There is a problem in that the appearance is re-damaged due to the unevenness of the side surface or the exposure of the butyl tape, and there is a problem in that defects such as cracking and corrosion of the reinforcing bar are caused again by infiltration of rainwater or foreign matter .

Korean Patent Registration No. 10-1744500 Korean Registered Patent No. 10-1852333

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the related art, and it is an object of the present invention to provide a method for preventing corrosion of a reinforcing bar while maintaining excellent adhesion to a repairing and reinforcing site of a concrete structure, The present invention provides a method of reinforcing the cracks and cracks in the outer wall of a concrete structure that can maintain the stability of the repair and reinforcement site even when the concrete structure is shrunk or expanded.

The present invention provides an environmentally friendly reinforcing method through the use of a water-soluble material, and provides a method of reinforcing cracks and cracks in an outer wall of a concrete structure, which is capable of providing diffusion resistance, such as preventing neutralization of a concrete structure. .

In order to accomplish the above object, the present invention provides a method for repairing cracks and cracks in an outer wall of a concrete structure, comprising the steps of: forming a primer layer, a putty layer and a coating layer on cracks and breakage portions of an outer wall of a concrete structure; A method for reinforcing cracks and cracks in an outer wall of a concrete structure, the method comprising: (A) a pretreatment step of removing the sand, dust, or oil from the cracked and damaged side surface of the concrete structure and drying the same; (B) applying a water-soluble anticorrosive primer to form a primer layer so that adhesion strength between the pretreated bottom surface of the concrete structure and the highly elastic putty layer to be formed later can be increased; (C) a high-strength mortar reinforcing step of filling the high-strength compression mortar to the side having a wavy form by breakage or dropping of the concrete structure and flattening the reinforcing mortar; (D) a high elasticity putty applying step of applying a high elasticity putty to the cracked and broken part side of the concrete structure to form a high elasticity putty layer; (E) applying a water-based paint to the upper surface of the high-elasticity putty layer to form a coat layer; and (D) applying a high- To form a high-elasticity putty layer by applying a coating amount of 1.5 to 2 kg / m < 2 > at a pressure of 160 to 250 bar so as to prevent pinholes from being formed by applying the coating solution in one direction and then alternately in the second direction .

(F) a top coating step of forming a top coating layer by applying a transparent water-soluble top coating paint to the top surface of the coating layer by the water-based exterior coating, wherein the water-soluble top coating paint comprises 100 parts by weight of an acrylic resin 10 to 20 parts by weight of a curing agent, and 30 to 50 parts by weight of an additive, with a viscosity of 10 to 100 cps; The acrylic resin is at least one selected from the group consisting of an acrylic ester copolymer, a polymethacrylic ester, an acrylic copolymer having a siloxane group, a silicone-acrylic copolymer and a silane-modified acrylic polyol resin for transparency and adhesion, , An amine compound, hexamethylene diisocyanate, isophorone diisocyanate, and xylene diisocyanate, and the additive is selected from homosalate, avobenzene, octylmethoxycinnamate, ethylhexylmethoxycinnamate, oxynosate , Octocryl, oxybenzone, tetrakis [methylene-3 (3,5-di-tert-butyl-4- hydroxyphenyl) propionate] methane, octadecyl- Butyl-4-hydroxyphenyl) propionate, 2,2'-methylenebis (4-methyl-6-thi-butylphenol), polytetrafluoroethylene, At least one selected from ethylene, perfluoroalkyl vinyl ether, and polyvinylidene fluoride can be used.

Here, the water-soluble anti-corrosive primer is a two-component composition comprising 40 to 60 parts by weight of a curing agent for curing with respect to 100 parts by weight of a water-soluble epoxy emulsion resin for rust resistance, chemical resistance and adhesiveness, and has a viscosity of 10 to 100 cps Lt; / RTI > The water-soluble epoxy emulsion resin is a bisphenol A type epoxy resin having an epoxy equivalent of 320 to 350 g / eq, having a solid content of 30 to 50% and a specific gravity of 0.90 to 0.96; The curing agent is selected from a group consisting of a modified aliphatic amine, a modified aliphatic amide, a polyamine and a polyamide, and has a specific gravity of 0.90 to 0.94; It can be applied in an amount of 0.3 to 0.5 kg / m 2.

Here, the high-strength pressed mortar is composed of 150 to 200 parts by weight of sand with respect to 100 parts by weight of blast furnace slag cement or portland cement having high strength and low water permeability, mortar adhesive 50 of acrylic resin or vinyl acetate resin for water- To 60 parts by weight, microcement 30 to 40 parts by weight for preventing cracking by responding to microstructure due to external stress, and inorganic hardstones for improving surface strength and adhesion strength 20 to 30 parts by weight of a polysiloxane, and 20 to 30 parts by weight of an isocyanate ester to induce elastic behavior to correspond to shrinkage expansion.

Here, the high elastic putty is an unsaturated polyester resin obtained by condensation reaction of maleic anhydride with phthalic anhydride and propylene glycol with respect to 100 parts by weight of an acrylic resin based on a polyacrylic acid ester or an acrylic acid maleic acid copolymer for crack resistance, water resistance and adhesiveness 30 to 50 parts by weight of a polyester resin, and 40 to 60 parts by weight of a polyurea resin or a silicone resin; A viscosity of 25000 to 35000 cps, a density of 1.35 to 1.55 kg / m 3 and a pH of 8.5 to 9.

Here, the exterior water-base coating composition is prepared by blending 60 to 100 parts by weight of an acrylic emulsion resin, 20 to 30 parts by weight of a water-soluble resin, 5 to 30 parts by weight of a water-soluble resin with respect to 100 parts by weight of a polyurea resin for adhesion, abrasion resistance, impact resistance, weather resistance, To 10 parts by weight, and 20 to 30 parts by weight of an additive; In order to increase the resistance to ultraviolet rays, the polyurea is used in order to prevent yellowing. The polyurea aliphatic polyurea, the aliphatic polyurea chain extended by diamine, the aliphatic polyurea in which ether amine and 4,4'-diphenylmethane diisocyanate are combined, One selected from among urea is used; The acrylic emulsion resin may be at least one selected from the group consisting of an acrylic ester copolymer, a polymethacrylic ester, an acrylic copolymer having a siloxane group, a silicone-acrylic copolymer, and a silane-modified acrylic polyol resin for adhesion and formation of a coating film; The water-soluble resin is required to exhibit weatherability and adhesion while providing complementarity. For the coating film durability, an amino alkyd resin, an acrylic alkyd resin, an alkyd mixed with a melamine formaldehyde resin and a polyester resin modified with a semi-dry or non- A urethane-modified water-dispersed alkyd polyol resin containing a fatty acid, a dimethylol propionic acid having a carboxyl group and a hydroxyl group, and hydroxyethylpropionic acid are used; The additive is preferably selected from the group consisting of polyoxyethylene alkylphenyl ether, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene alkyl ether having polyoxyethylene chain, hydroxyl group And a polyglycerol ester having a polyglycerol ester.

According to the present invention, it is possible to enhance the adhesion of the concrete structure to the repair and reinforcement sites, and also to perform durable repair and reinforcement such as having good adhesion with the coating layer. Even when the reinforcing bars are exposed to the outside due to breakage or dislocation, it is possible to prevent corrosion by covering and rust-preventing function, and it is possible to cope with contraction or expansion of concrete structure due to seasonal changes. Stability and durability can be achieved.

The present invention can realize an eco-friendly reinforcement method through the use of water-soluble materials and can provide diffusion resistance by blocking neutralization of the concrete structure side. It is possible to achieve the usefulness of performing reinforcement.

FIG. 1 is a process flow chart showing a composite reinforcing method of a cracked and broken portion of an outer wall of a concrete structure according to an embodiment of the present invention.
2 is a cross-sectional view illustrating an outer wall reinforcement structure covering an exposed reinforcing bar by a composite reinforcement method of a cracked and broken portion of an outer wall of a concrete structure according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view illustrating a reinforcement structure for an outer wall around a window by a composite reinforcement method of a cracked and broken portion of an outer wall of a concrete structure according to an embodiment of the present invention.
4 is a cross-sectional view illustrating an outer wall reinforcing structure including a top coating layer according to an embodiment of the present invention, in which the outer wall of the concrete structure is reinforced by cracks and fractures.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

As shown in FIGS. 1 to 4, the composite reinforcement method for cracks and breakage of the outer wall of a concrete structure according to an embodiment of the present invention includes a pre-treatment step S10, a primer application step S20, a high strength mortar reinforcement step S30, , A high elasticity putty applying step (S40), a water paint coating step (S50), and a top coating step (S60).

At this time, as shown in FIG. 2, the high-strength mortar reinforcing step S30 includes a portion of the concrete structure that is broken due to breakage or fall-off of the outer wall 1, and the reinforced reinforcing bars 2 are exposed to the outside It is a step that may be omitted if reinforcement of the concrete structure on the outer wall 1 side is unnecessary.

The pretreatment step S10 is a step of removing sand, dust or oil from the surface of the concrete structure 1 which is cracked and damaged, and drying the sand, dust or oil.

The primer application step S20 may be performed by increasing the adhesion of the pretreated bottom surface (repair and reinforcement site) of the concrete structure to the high strength mortar layer 20 and the highly elastic putty layer 30 to be formed later, A water-soluble anticorrosive primer is applied to form a primer layer 10 in order to prevent corrosion when the reinforcing bars 2 are exposed on an outer wall through the through holes.

As shown in FIG. 2, the primer layer 10 has a broken part due to breakage or dropping of the concrete structure on the outer wall 1 side, and when the embedded reinforcing bar 2 is exposed to the outside, To the outer surface of the outer wall of the periphery thereof, and is applied to cover the outer surface of the exposed reinforcing bar 2.

As shown in FIG. 3, when cracks are generated in the periphery of the window 1 on the outer wall 1 of the concrete structure, the primer layer 10 is formed by coating until the cracked surface and the outer wall of the surrounding wall do.

At this time, the water-soluble anticorrosive primer used for the primer layer 10 may have a two-part composition comprising 40 to 60 parts by weight of a curing agent per 100 parts by weight of the water-soluble epoxy emulsion resin.

The water-soluble epoxy emulsion resin may be a bisphenol A type epoxy resin having an epoxy equivalent of 320 to 350 g / eq and may have a solid content of 30 to 30 g / 50% and the specific gravity is preferably 0.90 to 0.96.

The curing agent for curing and adhesion is one selected from the group consisting of a modified aliphatic amine, a modified aliphatic amide, a polyamine and a polyamide, and more preferably has a specific gravity of 0.90 to 0.94.

Herein, the water-soluble anticorrosive primer has a viscosity and a viscosity of 10 to 100 cps, and is applied to the water-soluble anticorrosive primer maintaining the viscosity at a usage of 0.3 to 0.5 kg / Layer 10 and the high strength mortar layer 20 and the high elasticity putty layer 30 to be formed later while maintaining the adhesiveness to the pretreated bottom surface (repair and reinforcement portion) of the concrete structure on the outer wall 1 side of the concrete structure So that the corrosion of the reinforcing bar 2 exposed on the outer wall can be prevented by the anti-corrosive function.

As shown in FIG. 2 or 3, the high-strength mortar reinforcing step S30 is a step of filling the high-strength compression mortar with a damaged portion having a fractured shape by breakage or detachment of the outer wall of the concrete structure, Thereby forming a high-strength mortar layer 20.

The high-strength pressed mortar is prepared by mixing 150 to 200 parts by weight of sand with 100 parts by weight of blast furnace slag cement or Portland cement, 50 to 60 parts by weight of mortar adhesive with vinyl acetate resin or acrylic resin, 30 to 40 parts by weight of microcement, 20 to 30 parts by weight, and 20 to 30 parts by weight of an isocyanic acid ester.

The blast furnace slag cement or Portland cement is intended to utilize high strength and low water permeability.

The mortar adhesive is more preferably used to increase the adhesive strength, to have a waterproof function, to prevent the concrete structure from being neutralized, and to use acrylic resin.

The microcement is intended to prevent cracking by making it correspond to the fine behavior due to external stress.

The polysiloxane is intended to increase the surface penetration and form an inorganic crystal on the surface of the mortar to be filled, thereby improving the surface strength and increasing the bonding strength.

The isocyanate esters are used to induce elastic behavior to correspond to shrinkage expansion. It is preferable to use an aliphatic series so as to be resistant to ultraviolet rays or heat, and has a role of providing acid resistance and alkali resistance through bonding with the polysiloxane .

Here, the high-strength pressed mortar comprising the above-described components and composition ratio provides workability and filling property due to repair or reinforcement, can increase the adhesive force with the primer layer 10, and enables high-strength and strong pressing.

The highly elastic putty applying step S40 is a step of applying a highly elastic putty, which is a paste, to the cracked and broken portions of the concrete structure on the outer wall 1 side to form the highly elastic putty layer 30. [

As shown in FIG. 2 or FIG. 3, the high elasticity putty application step S40 is a method in which a high-elasticity putty is applied by spraying in a second order, firstly applied in one direction and then staggered in the other direction in the second direction, And a high-elasticity putty layer 30 is densely formed by applying a coating amount of 1.5 to 2 kg / m < 2 > at a pressure of 160 to 250 bar for a working efficiency.

Here, the high elastic putty may be applied in various forms such as a method using a putty hera, not a spray application.

The high elastic putty may be prepared by mixing 30 to 50 parts by weight of an unsaturated polyester resin obtained by axial reaction of maleic anhydride with phthalic anhydride and propylene glycol with respect to 100 parts by weight of an acrylic resin based on a polyacrylic acid ester or an acrylic acid maleic acid copolymer, And 40 to 60 parts by weight of a silicone resin.

Here, the high elastic putty has a viscosity of 25,000 to 35,000 cps, a density of 1.35 to 1.55 kg / m 3 and a pH of 8.5 to 9 in order to prevent excellent adhesion and neutralization of the concrete structure and to have diffusion resistance.

The acrylic resin by the polyacrylic acid ester or acrylic acid maleic acid copolymer has crack resistance, water resistance and adhesiveness.

The unsaturated polyester resin in which the maleic anhydride is condensed with phthalic anhydride and propylene glycol has high elasticity and impact resistance.

The polyurea resin includes elasticity to impart adhesiveness, durability, chemical resistance, water resistance, corrosion resistance, abrasion resistance, impact resistance, and the like. The silicone resin is excellent in heat resistance and cold resistance, chemical resistance, water resistance and aging resistance .

Here, the high-elastic putty may be mixed with microcement powder or calcium carbonate powder for adhesion and affinity with the concrete structure, and it may be durable, but a small amount is added in order to prevent deterioration of high elasticity, It is preferable to add 5 to 15 parts by weight to 100 parts by weight.

Here, the high elastic putty may include a pH adjuster such as phosphate or sodium hydroxide to maintain the alkalinity as a method for exhibiting the neutralization prevention function of the concrete structure, and may include a dispersant and a defoaming agent.

The aqueous paint coating step S50 is a step of forming the coating layer 40 by painting the exterior water-based paint onto the upper surface of the high-elasticity putty layer 30 by spraying.

The water-based exterior paint for forming the coating layer (40) comprises 60 to 100 parts by weight of an acrylic emulsion resin, 20 to 30 parts by weight of a water-soluble resin, 5 to 10 parts by weight of a pigment, 20 to 30 parts by weight of an acrylic emulsion resin, And 50 to 100 parts by weight of a curing agent.

The polyurea is capable of exhibiting the functions of adhesion, abrasion resistance, impact resistance and weather resistance in addition to providing coating film durability and waterproofing property. In particular, in order to enhance the resistance to ultraviolet rays and to prevent the occurrence of yellowing, polyurea spic aliphatic poly Urea, an aliphatic polyurea chain extended by a chain of diamine, and an aliphatic polyurea in which ether amine and 4,4'-diphenylmethane diisocyanate are combined.

The acrylic emulsion resin is at least one selected from an acrylic ester copolymer, a polymethacrylic ester, an acrylic copolymer having a siloxane group, a silicone-acrylic copolymer, and a silane-modified acrylic polyol resin as a binder for forming an adhesive property and a coating film .

The water-soluble resin is mixed with an amino alkyd resin, an acrylic alkyd resin, a polyester resin modified with semi-dry or non-drying oil-repellent, and a melamine formaldehyde resin so as to exhibit weatherability and adhesion while maintaining complementarity A urethane-modified water-dispersed alkyd polyol resin containing a fatty acid, a dimethylol propionic acid having a carboxyl group and a hydroxyl group, and hydroxyethylpropionic acid are preferably used.

The additives may be selected from the group consisting of polyoxyethylene alkylphenyl ether, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene chain having polyoxyethylene chain An ethylene alkyl ether, and a polyglycerol ester having a hydroxyl group.

The curing agent may be at least one selected from polyamine, etheramine, methyldiethylamine, N, N, N, N-tetramethylbutane diamine, polyether polyol, amine compound and aminoalcohol compound.

In this case, it is preferable that the external water-based coating material is constituted to occupy 35 to 45% of solids in order to be adhered. When spraying for coating is applied, it is treated with 7 to 9 m 2 / L and formed into a dry film thickness of 40 to 60 μm .

In order to prevent neutralization of the concrete structure, the external water-based coating material is preferably provided to have a physical property of pH 8 to 9. To this end, a pH adjusting agent such as phosphate or sodium hydroxide may be used.

Here, the water-based exterior coating material may include a dispersant and a defoaming agent.

As shown in FIG. 4, the top coating step S60 is a step of forming a top coating layer 50 by applying a water-soluble top coating paint on the top surface of the coating layer 40 formed by the water-based exterior coating.

The water-soluble top coating paint for the top coating layer 50 may be composed of 10 to 20 parts by weight of a curing agent and 30 to 50 parts by weight of an additive with respect to 100 parts by weight of the acrylic resin. It is preferable to have a physical property of viscosity of 10 to 100 cps for stable adhesion.

The above-mentioned acrylic resin has transparency and water resistance as well as functions as a binder to have stable adhesiveness. Particularly, acrylic resin, acrylate copolymer, polymethacrylic ester, acrylic copolymer having siloxane group, silicone-acrylic copolymer, silane-modified acrylic polyol resin It is preferable to use at least one selected from among them.

It is preferable that the curing agent is one selected from polyamine, amine compound, hexamethylene diisocyanate, isophorone diisocyanate, and xylene diisocyanate.

The additive is preferably selected from the group consisting of homosalate, avobenzene, octylmethoxycinnamate, ethylhexylmethoxycinnamate, oxynosate, octohexaate, octanoate, (3,5-di-t-butyl-4-hydroxyphenyl) propionate] methane, octadecyl-3- 4-hydroxyphenyl) propionate, and 2,2'-methylenebis (4-methyl-6-thi-butylphenol).

Further, at least one selected from the group consisting of polytetrafluoroethylene, fluoroethylene propylene, tetrafluoroethylene, perfluoroalkyl vinyl ether and polyvinylidene fluoride can be used to improve the water repellency by increasing the water repellency with the above additives have.

Here, the top coating material may include a dispersing agent and a defoaming agent.

Accordingly, through the composite reinforcing method of cracks and breakage sites on the outer wall of the concrete structure according to the present invention having the above-described structure, it is possible not only to enhance the adhesion to the repair and reinforcement side of the concrete structure, It is possible to perform durable maintenance and reinforcement work such as making it possible to prevent corrosion by covering and rusting function even when the reinforcing bar is exposed to the outside due to breakage or detachment of existing concrete structure, It is possible to cope with contraction or expansion of the concrete structure due to the change, and it is possible to provide the advantage that the stability and durability of the concrete structure on the maintenance and reinforcement side can be provided.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. May be made, which will be within the technical scope of the present invention.

10: primer layer 20: high strength mortar layer
30: high elasticity putty layer 40: coat layer
50: Top coating layer

Claims (6)

In a method of reinforcing a crack and a damaged area of an outer wall of a concrete structure to be repaired and reinforced by a method of forming a primer layer, a putty layer and a coating layer on cracks and broken portions of an outer wall of a concrete structure,
(A) a pretreatment step of removing sand, dust or oil from the surface of the cracked and damaged portion of the concrete structure and drying the same;
(B) applying a water-soluble anticorrosive primer to form a primer layer so that adhesion strength between the pretreated bottom surface of the concrete structure and the highly elastic putty layer to be formed later can be increased;
(C) a high-strength mortar reinforcing step of filling the high-strength compression mortar to the side having a wavy form by breakage or dropping of the concrete structure and flattening the reinforcing mortar;
(D) a high elasticity putty applying step of applying a high elasticity putty to the cracked and broken part side of the concrete structure to form a high elasticity putty layer;
(E) painting a water-based paint on the upper surface of the high-elasticity putty layer to form a coat layer by applying an external water-based paint; / RTI >
In the step (D), the high-elasticity putty is applied by spraying in the second order, and the coating is applied in one direction in the first direction and then alternately in the second direction so as to prevent pinholes from being generated. And a coating amount of 1.5 to 2 kg / m < 2 > to form a highly elastic putty layer;
The high elastic putty is an unsaturated polyester resin 30 which is subjected to axial reaction of maleic anhydride with phthalic anhydride and propylene glycol for high elasticity with respect to 100 parts by weight of acrylic resin based on polyacrylic acid ester or acrylic acid maleic acid copolymer for crack resistance, To 50 parts by weight of a polyurethane resin or 40 to 60 parts by weight of a polyurethane resin or a silicone resin and has a viscosity of 25000 to 35000 cps, a density of 1.35 to 1.55 kg / m3, and a pH of 8.5 to 9. [ Composite Reinforcement Method of Crack and Damage Area of Exterior Wall of Structure. The method according to claim 1,
(F) a top coating step of forming a top coating layer by applying a transparent water-soluble top coating paint to the top surface of the coating layer by the water-based exterior coating; Further comprising:
The water-
10 to 20 parts by weight of a curing agent and 30 to 50 parts by weight of an additive, based on 100 parts by weight of an acrylic resin, and having a viscosity of 10 to 100 cps;
The acrylic resin may be at least one selected from an acrylic ester copolymer, a polymethacrylic ester, an acrylic copolymer having a siloxane group, a silicone-acrylic copolymer, and a silane-modified acrylic polyol resin for transparency and adhesiveness,
The curing agent may be one selected from polyamines, amine compounds, hexamethylene diisocyanate, isophorone diisocyanate, and xylene diisocyanate,
The additive is selected from the group consisting of homosalate, abobenzene, octylmethoxycinnamate, ethylhexylmethoxycinnamate, oxynosate, octocryl, oxybenzone, tetrakis [methylene- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, 2,2'-methylenebis (4-methyl- At least one selected from the group consisting of polytetrafluoroethylene, polytetrafluoroethylene, fluoroethylene propylene, tetrafluoroethylene, perfluoroalkyl vinyl ether and polyvinylidene fluoride is used. Composite Reinforcement Method for Crack and Damage Area of. The method according to claim 1,
The water-soluble rust-
And 40 to 60 parts by weight of a curing agent for curing with respect to 100 parts by weight of a water-soluble epoxy emulsion resin for rust resistance, chemical resistance and adhesiveness, and having a viscosity of 10 to 100 cps;
The water-soluble epoxy emulsion resin is a bisphenol A type epoxy resin having an epoxy equivalent of 320 to 350 g / eq, having a solid content of 30 to 50% and a specific gravity of 0.90 to 0.96;
The curing agent is selected from a group consisting of a modified aliphatic amine, a modified aliphatic amide, a polyamine and a polyamide, and has a specific gravity of 0.90 to 0.94;
And a coating amount of 0.3 to 0.5 kg / m < 2 > is applied to the outer wall of the concrete structure. The method according to claim 1,
The high-
50 to 60 parts by weight of a mortar adhesive composed of vinyl acetate resin or acrylic resin for increasing the adhesive strength and waterproofing function, 100 parts by weight of the blast furnace slag cement or portland cement having a high strength and a low water permeability, 20 to 30 parts by weight of polysiloxane for improving surface strength and adhesion strength by forming inorganic crystals on the surface of the mortar to be filled and for increasing the surface penetration ability, And 20 to 30 parts by weight of an isocyanate ester for inducing a behavior to cope with expansion and shrinkage of the concrete structure. delete The method according to claim 1,
The exterior waterborne coating material,
A water-soluble resin, 20 to 30 parts by weight of a water-soluble resin, 5 to 10 parts by weight of a pigment, 20 to 30 parts by weight of a water-soluble resin, 20 to 30 parts by weight of a water- 30 parts by weight;
In order to increase the resistance to ultraviolet rays, the polyurea is used in order to prevent yellowing. The polyurea aliphatic polyurea, the aliphatic polyurea chain extended by diamine, the aliphatic polyurea in which ether amine and 4,4'-diphenylmethane diisocyanate are combined, One selected from among urea is used;
The acrylic emulsion resin may be at least one selected from the group consisting of an acrylic ester copolymer, a polymethacrylic ester, an acrylic copolymer having a siloxane group, a silicone-acrylic copolymer, and a silane-modified acrylic polyol resin for adhesion and formation of a coating film;
The water-soluble resin is required to exhibit weatherability and adhesion while providing complementarity. For the coating film durability, an amino alkyd resin, an acrylic alkyd resin, an alkyd mixed with a melamine formaldehyde resin and a polyester resin modified with a semi-dry or non- A urethane-modified water-dispersed alkyd polyol resin containing a fatty acid, a dimethylol propionic acid having a carboxyl group and a hydroxyl group, and hydroxyethylpropionic acid are used;
The additive is preferably selected from the group consisting of polyoxyethylene alkylphenyl ether, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene alkyl ether having polyoxyethylene chain, hydroxyl group And a polyglycerin ester having an average particle size of not more than 100 m < 2 >.

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