KR20160087131A - Crack repair construction method for concrete structure - Google Patents
Crack repair construction method for concrete structure Download PDFInfo
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- KR20160087131A KR20160087131A KR1020150005788A KR20150005788A KR20160087131A KR 20160087131 A KR20160087131 A KR 20160087131A KR 1020150005788 A KR1020150005788 A KR 1020150005788A KR 20150005788 A KR20150005788 A KR 20150005788A KR 20160087131 A KR20160087131 A KR 20160087131A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/18—Materials not provided for elsewhere for application to surfaces to minimize adherence of ice, mist or water thereto; Thawing or antifreeze materials for application to surfaces
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0203—Arrangements for filling cracks or cavities in building constructions
- E04G23/0211—Arrangements for filling cracks or cavities in building constructions using injection
Abstract
Description
The present invention relates to a method of repairing cracks in a concrete structure, and more particularly, to a method of repairing cracks in a concrete structure by a method of repairing cracks in a concrete roof structure, The concrete structure itself maintains high strength due to the repair and reinforcement of the crack area by applying the high performance coating waterproofing agent and the high strength mortar after repairing the crack by applying the repair agent to the surface crack part of the concrete structure, And to a method for repairing cracks in a concrete structure which is resistant to corrosion and cracking of a structural material.
Generally, waterproofing materials used for construction and civil structure protection systems include sheet-type waterproofing materials, film-type waterproofing materials, and infiltration-proof waterproofing materials depending on the construction method. Among them, the method of applying by using an infiltration type waterproofing material is a method which was used in waterproofing work such as a bridge top plate in the past, and is a method in which silicon is dissolved as a strong solvent and used as a liquid penetration waterproofing agent. The construction method has a low resistance to cracking and has a problem that it does not penetrate into high strength concrete of 300kgf /
In addition, the sheet type waterproofing is uniform and has excellent waterproofing effect. However, it is costly and difficult to connect the sheets during the construction process, so that the surface is not uniform and the waterproof function is lost due to the leakage at the connection part. In addition, the coating type waterproofing construction has a disadvantage that the waterproofing performance is lost at the interface, while the resistance to the cracks of the concrete is weak and the continuous construction without connection portion is possible and the effect is excellent.
As described above, the waterproofing agent used in the coating waterproofing construction for construction and civil engineering is an emulsion type which is mainly composed of rubber asphalt, acrylic rubber or acrylic resin, and a solution type urethane or epoxy resin containing chloroprene or chlorosulfonated polyethylene, Among them, rubber asphalt and urethane-based waterproofing agents are widely used.
The rubber asphalt-based waterproofing agent is manufactured by a thermal process in which asphalt is rapidly cured by mixing synthetic rubber and various resins by using the thermoplastic properties of the polymer, and by a cold process in which asphalt is emulsified in a synthetic latex and then naturalized by evaporation of water , Styrene-based polymers, adventitious polypropylene, styrene-butadiene latex, and the like are usually mixed in asphalt.
In recent years, a water-soluble urethane-based waterproofing agent has been developed and used as a property of a polyurethane emulsion, a polyurethane colloidal dispersion, or a polyurethane aqueous solution in consideration of the safety of work on environmental pollution and toxicity However, in terms of physical properties including durability, there are many points that are insufficient compared with the conventional solvent type urethane type waterproofing agent.
In addition to the basic functions as a waterproofing agent to prevent leaks in buildings and the like, the coating waterproofing agents enumerated above are used in recent years to prevent corrosion of buildings, prevent the formation of weeds and insects, It is required to have additional functions such as resistance to cracks caused by a rapid change in external temperature. In particular, rubber asphalt waterproofing agents have a weak function to prevent cracking of concrete structures due to weak rubber components .
Although there are many techniques that have been developed for the water-repellent or coating-type waterproofing agent, there has been an attempt to use an emulsion-type waterproofing agent as a representative coating waterproofing agent that meets the environmentally friendly demands. In addition, Research to use is also actively underway.
In addition, the surface of the concrete structure is usually exposed to the outside, and when it ages over time, cracks are formed on the surface of the concrete structure to deteriorate the rigidity of the structure. Further, when the moisture penetrates through the cracks, In addition, the penetration of water causes corrosion of the reinforced steel inside. Therefore, when the concrete structure is aged, the surface must be repaired and finishing due to such aesthetics and strength degradation.
In order to solve such a problem, Korean Patent Publication No. 10-0942521 discloses a waterproofing method of a composite insulating film using an inorganic material and a coating material for waterproofing a waterproofing method for constructing a multi-layered emulsion type waterproofing material, It is recognized that it can be used only for a very limited use because it is disadvantageous in crack generation and durability due to not using a reinforcing material such as a nonwoven fabric.
Korean Patent Publication No. 10-0883743 discloses a method of coating the above-mentioned cross-linked waterproofing composition by a laminated waterproofing method in which a cross-linked waterproofing composition is impregnated with a glass fiber roving cloth, and at the same time, The present invention relates to a bridge waterproofing method using a bridge waterproofing composition of a bridge or a concrete structure comprising a step of applying an alkaline epoxy primer to a concrete surface, A first waterproof film forming step of impregnating the glass fiber with a cross-linked waterproofing composition comprising an epoxy resin, a urethane epoxy resin, tar and an adhesive, and performing a laminating operation; (SiO 2 ) is sprayed onto the top of the waterproof membrane. In the patent document 10-0688468, there is disclosed a method of waterproofing and repairing a crack of a concrete structure, And a step of laminating and curing a coating elastic waterproofing material-impregnated nonwoven fabric, and a waterproofing and crack repairing method of a concrete structure is disclosed in Patent Document No. 10-0806613, which discloses a waterproofing method using a roofing sheet.
However, since all of the above-described techniques using the known methods use a solvent-type waterproofing agent, there are problems in operation inconvenience, weakness in moisture and durability, and the present inventors tried various methods to solve the problems. Among them, Resistant to ultraviolet rays or temperature changes over a long period of time due to its excellent alkali, oil resistance, heat resistance and tensile strength, hardly changes physical properties even at high and low temperatures, and has good adhesion even in the presence of water, The waterproofing agent for waterproofing of concrete structures and the waterproofing method of concrete structures using such waterproofing agent have been developed. This technology is disclosed in Patent No. 10-0982820 (Registered on Sep. 10, 2010), Patent No. 10-1122254 (Hereinafter referred to as " sheet for concrete structure " Sum is usefully carried out in waterproofing method.
In the meantime, the present invention relates to a method for repairing cracks by injecting a repair material composed of a polybutylacrylic acid copolymer composition into a surface crack region of a concrete structure, The crack repair method of the concrete structure by using the undercoat adhesive and the waterproofing agent made of the water-soluble ethylene vinyl acetate vapor phase copolymer resin composition as it is is convenient for the construction material because it is compatible with the material to be used, The present inventors completed the present invention in consideration of the fact that the adhesive strength is excellent and the strength and the crack resistance are further improved.
It is an object of the present invention to provide a water-soluble ethylene-vinyl acetate-based copolymer resin composition which is excellent in filling property, adhesiveness and compressive strength by injecting a repair material composed of a polybutyl acrylic acid copolymer composition into a crack region and applying a subbing adhesive It is possible to prevent micro-propagation type cracking as well as waterproofing function of crack area against the change of ultraviolet ray or temperature for a long period of time by applying coating film water repellent agent. Therefore, crack repair part of concrete structure becomes more solidly integrated, And to provide a method for repairing cracks in a concrete structure in which resistance to cracking and durability are further improved.
Another object of the present invention is to provide a waterproof coating composition which is free from harmful effects due to volatile organic compounds (VOC) because the organic solvent is not used at all at the crack site of the concrete structure, the undercoat adhesive and the water- And a high-viscosity mortar which is high in viscosity and is firmly bonded to a high-strength mortar which is applied to the upper part. Therefore, it is possible to provide a method of repairing cracks in a concrete structure in which impact strength and surface smoothness are improved.
The method of repairing cracks in a concrete structure according to the present invention includes a first step of cleaning the surface of a concrete structure and cleaving a crack site; A second step of repairing cracks by injecting a repair material mixed with polybutylacrylic acid copolymer, cement, sand and water at a weight ratio of 1: 0.5 to 1.5: 0.5 to 1.5: 0.5 to 1.5 to the crack site of the concrete structure; A third step of applying a primer adhesive made of a polybutylacrylic acid copolymer on the surface of the concrete structure and drying the same; A fourth step of applying and drying a coating water repellent agent made of a water-soluble ethylene vinyl acetate-based copolymer resin composition on the undercoat agent one to three times; And a fifth step of applying a high-strength mortar to the coating film waterproofing agent to a thickness of 1 to 10.
The polybutylacrylic acid copolymer used in the second step and the third step is prepared by emulsion polymerization of polybutylacrylic acid, polyethylacrylic acid, polystyrene, and polyacrylic acid with water, and the water-soluble ethylenevinylene (A) 50 to 60% by weight of a water-soluble ethylene vinyl acetate-based copolymer, (B) 20 to 30% by weight of a water-soluble acrylic emulsion resin, and (C) a polybutylacrylic acid copolymer 10 To 20% by weight, and a solid content of 40 to 60% by weight and a viscosity of 5,000 to 10,000 cps (25).
The high-strength mortar to be used in the fifth step is characterized by having a compressive strength (20 basis) after 28 days of application of 300 kgf / or more.
The repairing agent and undercoating agent used in the crack repairing method of the present invention are excellent in stability due to permeability, adhesiveness, compressive strength and temperature change to concrete structures using polybutylacrylic acid copolymer, and water- The acrylic emulsion resin and the polybutylacrylic acid copolymer are mixed with the acetic acid gas-phase copolymer, so that the composition stability is excellent, the solid content is high and the drying speed is fast and the acid resistance, alkali resistance, oil resistance, heat resistance and tensile strength are excellent. It is strong against change. Therefore, the crack area repaired by the method of the present invention is extremely firmly integrated with the existing concrete structure, so that not only separation phenomenon and heterogeneity are generated, but also resistance to crack and durability are excellent, and high temperature (about 70) and low temperature -50), there is almost no change in physical properties, and there is an effect that the adhesion is good even in the presence of water.
In addition, since the organic solvent is not used at all in the repairing agent, the undercoating adhesive and the water-soluble coating film waterproofing agent used in the crack repairing method of the present invention, there is no harmfulness due to the organic solvent and in particular, the water content and the viscosity of the water- It has a good impact strength and surface smoothness after construction because it is firmly bonded to the high strength mortar that is applied to the upper part.
1 is a flowchart showing a method of repairing cracks in a concrete structure of the present invention.
The present invention relates to a method of repairing cracks in a concrete structure, comprising: a first step of arranging a surface of a concrete structure and cleaning a crack area; A second step of repairing cracks by injecting a repair material mixed with polybutylacrylic acid copolymer, cement, sand and water at a weight ratio of 1: 0.5 to 1.5: 0.5 to 1.5: 0.5 to 1.5 to the crack site of the concrete structure; A third step of applying a primer adhesive made of a polybutylacrylic acid copolymer on the surface of the concrete structure and drying the same; A fourth step of applying and drying a coating water repellent agent made of a water-soluble ethylene vinyl acetate-based copolymer resin composition on the undercoat agent one to three times; And a fifth step of applying a high-strength mortar to the coating film waterproofing agent at a thickness of 1 to 10.
Hereinafter, the process of each step of the present invention will be described in detail with reference to the drawings. It should be understood that the present invention is not limited to the specific details of the present invention, And does not mean that the technical ideas and the scope of the invention are limited.
As shown in FIG. 1, the method of repairing cracks in a concrete structure according to the present invention includes steps 1 to 5, and the first step is a step of cleaning the surface of the concrete structure and cleaning the cracks . This is to remove foreign matter from the concrete surface by a planer or a manual work, or to clean the floor with a high-pressure washer or broom after arranging the protrusions, thereby facilitating the penetration of the repair material into the crack area of the concrete surface.
In the second step, cracks are repaired by injecting a repair material mixed with polybutylacrylic acid copolymer, cement, sand and water at a weight ratio of 1: 0.5 ~ 1.5: 0.5 ~ 1.5: 0.5 ~ 1.5 to the crack site of the concrete structure This is because the repair material made of the polybutylacrylic acid copolymer composition containing the inorganic component between the gap and the pores in the crack is densely packed to have a strong adhesive force so as to prevent the fine progressive cracks in the concrete structure, It is effective to prevent lifting phenomenon and pinhole occurrence with the adhesive layer or the waterproof layer applied to the adhesive layer.
In other words, the polybutylacrylic acid copolymer used as a repair material in the present invention is excellent in transparency, transparency, weather resistance, chemical resistance, electrical insulation and water resistance, has excellent heat resistance of about 150, The inorganic composite component is easily infiltrated and filled between the pores of the crack due to the excellent permeability. Therefore, not only the microcracks of the concrete structure and the corrosion of the internal steel are prevented by the action of the repair material, Thereby remarkably improving the heterogeneous phenomenon.
The polybutylacrylic acid copolymer used in the second step is a component which is compatible with the undercoating agent used in the third step of the present invention and the polybutylacrylic acid copolymer (C) which is one component in the coating film waterproofing agent used in the fourth step Of course, can be conveniently used in the field.
The third step is a step of applying a primer made of a polybutylacrylic acid copolymer to the surface of the concrete structure and drying the same. The water-soluble adhesive as described above improves the smoothness of the concrete crack area and the adhesive strength with the waterproof layer But also provides an effect of preventing cracks on the concrete surface. In the present invention, a resin made of a polybutylacrylic acid copolymer having excellent permeability and elasticity to the surface of a concrete structure is the most desirable. This was considered to be the same as that of the polybutylacrylic acid copolymer (C), which is one component of the repair material used in the second step of the present invention and the coating film waterproofing agent used in the fourth step, considering the workability and convenience in the field .
The fourth step is a step of applying a waterproofing agent of a water-soluble ethylene-vinyl acetate-acetic acid copolymer resin composition on the undercoating agent one to three times and drying the applied coating agent. (A) 50 to 60% by weight of a water-soluble ethylene vinyl acetate-based copolymer, (B) 20 to 30% by weight of a water-soluble acrylic emulsion resin; And 10 to 20% by weight of a polybutylacrylic acid copolymer (C), and having a solid content of 40 to 60% by weight and a viscosity of 5,000 to 10,000 cps (25) And adhesion.
For reference, the water-soluble ethylene-vinyl acetate (V) copolymer (A) has a weight average molecular weight of 1,000 to 12,000 and a density of 0.918 to 0.932 g / And a polyethylene having a narrow molecular weight distribution is preferable in view of the uniformity of the product. Typical polyethylene is a copolymer obtained by chemically bonding a main chain of a polymer having a polarity such as acrylic acid or maleic anhydride as a side chain In the present invention, the flexibility of a product is increased by using a copolymer obtained by graft-polymerizing ethylene with vinylacetate.
The water-soluble ethylene vinyl acetate-based copolymer (A) is produced by copolymerizing ethylene and vinyl acetate with an amount of about 1 to 50% of vinyl acetate, and a vinyl acetate content of about 1 to 25% %. However, as the content of vinyl acetate is increased, the elastic modulus and the heat bonding temperature of the film are lowered, while the impact strength, tensile strength and permeability are increased. Therefore, in the present invention, the content of vinyl acetate is 25% This is because it has flexibility at low temperature and has good low temperature bonding property and good hot tack (adhesive strength immediately after heat bonding).
The water-soluble acrylic emulsion resin (B) is contained in an amount of about 20 to 30% by weight based on the total resin composition and is mixed at a weight ratio of about 1/3 to 1/2 as compared with 50 to 60% by weight of the component (A) Generally, acrylic emulsion resin is a general term for a thermoplastic resin obtained by polymerizing esters of acrylic acid or methacrylic acid. When acrylic emulsion is used as an adhesive, it is usually used as a binder. In the present invention, when acrylic acid is polymerized, The viscosity of the acrylic emulsion resin (B) is increased to make the viscosity of the polymer not completely hardened. Therefore, when the resin composition is blended with predetermined water due to the composition of the acrylic emulsion resin (B) It is possible to form a coating film waterproofing agent having high adhesion and adhesion to the bottom surface after drying.
The water base-type acrylic emulsion resin can be variously manufactured by a variety of methods such as aqueous, organic solvent type, room temperature drying type, and heat drying type. However, the aqueous type used in the present invention is excellent in heat resistance And has excellent transparency and transmittance (excellent refractive index is 1.49), chemical resistance, electrical insulation and water resistance, and is excellent in absorbency, permeability, weatherability and gloss, and a water-soluble binder Unlike existing waterborne binders, it has excellent adhesion to various substrates of various buildings as well as steel, so that it is possible to coat the system economically. Unlike existing planetary binders, it is designed to be environmentally friendly, so it is possible to create a pleasant work environment by not containing heavy metals and minimizing odor generated during coating operation.
The water-soluble acrylic emulsion resin is prepared by adding commonly used additives such as an emulsifier, defoamer, and dispersant to the emulsion, mixing them evenly, and then adding and dispersing the pigment if necessary. When the dispersion is completed, the additive necessary for various functions is added to complete the product. Conventionally, a method of dispersing a pigment directly in a water-soluble paint or the like, rather than adding an emulsion after dispersing the pigment in water, and then adjusting the viscosity with a small amount of water, if necessary, is adopted to enable high solids of the resin, The content is 30 to 60% by weight, thereby imparting quick drying property to the water-soluble acrylic emulsion resin.
Next, the polybutylacrylic acid copolymer (C) to be mixed with the resin composition is used as an adhesive, which has an effect of preventing surface cracks while imparting a slight elasticity to the surface of the waterproof surface, The amount of the copolymer (C) to be used is preferably about 10 to 15% by weight based on 100% by weight of the resin composition, and about 15 to 20% by weight in the case of a high humidity, It was studied as appropriate. The polybutylacrylic acid copolymer (C) used in the present invention is a copolymer obtained by mixing polybutylacrylic acid homopolymer, polyethylacrylic acid homopolymer, polystyrene homopolymer, and polyacrylic acid homopolymer in an appropriate ratio and emulsifying with water , Water-soluble, and excellent in physical properties such as fire resistance, abrasion resistance, oil resistance and ultraviolet resistance.
A method for producing a water repellent agent for a concrete structure according to the present invention is characterized in that a resin composition composed of (A) + (B) + (C) is put into a mixing vessel and the mixing vessel is agitated at a rate of 1 to 3 The viscosity of the waterproofing agent is adjusted so that the viscosity of the waterproofing agent is in the range of 40 to 60 wt% based on the weight of the composition and 25 to 10,000 cps in terms of the viscosity at 25, It is preferable to adjust within a limited range in consideration of workability and adhesion.
The coating film waterproofing agent is excellent in compounding stability, has a high solids content and has a high drying rate. By mixing a water-soluble acrylic emulsion resin and a polybutylacrylic acid copolymer adhesive in a certain ratio, it is possible to improve the acid resistance, oil resistance, oil resistance, heat resistance and tensile strength So that the waterproof layer having excellent durability against changes in ultraviolet rays or air temperature over a long period of time and having little change in physical properties even at a high temperature (about 70) and a low temperature (about -50) is formed.
The fifth step is a step of applying a high-strength mortar to the coating film waterproofing agent to a thickness of 1 to 10, and it is preferable that the coating thickness is usually finished to about 3 to 7 on the average. If the thickness of the mortar is less than 1, the surface of the mortar tends to be poorly bonded to the waterproofing agent applied to the bottom of the mortar, and it is difficult to smoothly finish the surface. If the thickness of the mortar is 10 or more, Or peeling phenomenon may occur, and it is difficult to maintain smoothness and airtightness for a crack repairing site for a long period of time.
The high-strength mortar has various compressive strengths of about 200 to 300 kgf / sec., While the high-strength mortar used in the present invention has a compressive strength of 20 When the water is used in a range of 3.1 to 3.5 (3.5 in summer, 3.3 in winter, 3.1 in winter) based on 20 kg of mortar powder, the concrete structure and the coat The adhesive force with the waterproofing agent becomes good and the temperature at which the construction can be performed should be 5 or more and 30 or less so that the adhesive strength after curing can be maintained at 20 to 30 kgf / The high-strength mortar is a non-shrinkage mortar with a coefficient of expansion (within 24 hours) of 0 to 0.2%. It is preferable that a large area repair of about 100 or more is based on shotcrete construction, and a small repair is performed using a trowel.
Next, a description will be made of an experiment and a comparative example in which a crack repair method of a concrete structure using the above-mentioned coating film waterproofing agent is performed. The present invention has been completed through a number of experiments, but it will be easily understood by those skilled in the art The present invention will be described by way of preferred embodiments.
[Example 1]
30 parts by weight of a water-soluble acrylic emulsion resin and 20 parts by weight of a polybutylacrylic acid copolymer were added to 50 parts by weight of a water-soluble ethylene-vinyl acetate acetic acid copolymer and added to a blender together with a plasticizer to obtain a viscosity of 7,000 cps At a rotation speed of 200 rpm for about 2 hours until a water-soluble coating film was obtained.
[Example 2]
A water-soluble coating film waterproofing agent was prepared in the same manner as in Example 1, except that 30 parts by weight of a water-soluble acrylic emulsion resin and 10 parts by weight of a polybutylacrylic acid copolymer were contained in 60 parts by weight of a water-soluble ethylene-vinyl acetate acetic acid copolymer .
[Example 3]
Except that 20 parts by weight of a water-soluble acrylic emulsion resin and 20 parts by weight of a polybutylacrylic acid copolymer were added to 60 parts by weight of a water-soluble ethylene vinyl acetate-based copolymer, .
[Experimental Example]
The waterproofing agent prepared according to Examples 1 to 3 and the commercially available waterproofing agent were compared with the rubber asphalt coating film waterproofing agent and solvent type urethane coating film waterproofing agent to determine tensile strength, elongation, adhesion strength, chemical resistance, surface smoothness and workability The results are shown in Table 1. < tb >< TABLE > Here, tensile strength and adhesion strength were measured according to ASTM D 638-91 and ASTM D 4541-89, elongation was measured according to ASTM D638-91, and chemical resistance was measured according to ASTM D 543 method.
In the surface smoothness,
: No surface defect such as pinholes
: Surface defects such as pinholes are generated finely
From the results shown in Table 1, it can be seen that the water-soluble coating film waterproofing agent of the present invention is generally excellent in tensile strength, elongation, adhesion strength, chemical resistance and surface smoothness, And it can be seen that there is no hazard due to organic solvents.
As described above, the water-soluble coating film waterproofing agent of the present invention can exhibit a strong resistance to cracks in a concrete structure, so that the waterproof performance is not deteriorated for a long period of time, , Water tanks, septic tanks, swimming pools, tunnels, and bridges.
Next, cracks were repaired by the crack repair method of the concrete structure according to the present invention, and then the undercoating adhesive was applied and dried. Then, the water repellent layer (5 mm in thickness) coated with the EVA coating water repellent agent of Examples 1 to 3, The waterproofing properties of the conventional rubber asphalt coating film (3 mm thickness) and the rubber asphalt glass fiber lamination technique (5 ~ 7 mm thickness) were compared with each other to evaluate adhesiveness, waterproof performance, irregularity of the surface of the waterproof layer, And cracks, waterproof layer peeling, workability, curing speed, and construction time.
As a result, the repair site of the crack repairing method of the present invention can maintain a compressive strength equal to or higher than that of the existing concrete due to the use of the high strength mortar even when repairing a high strength concrete structure of 300f / And excellent workability. As a result, it can be seen that the present invention is the most ideal method of repairing cracks in concrete structures compared to the conventional methods.
Therefore, the crack repair method of the concrete structure of the present invention is excellent in tensile property by successively constructing the repair material, the undercoating adhesive, the coat-waterproofing agent and the high-strength mortar on the cracks generated in the column and wall surfaces, Cracks are not generated, so that the elasticity and the heat insulating property of the concrete structure surface are strengthened and the occurrence of micro cracks can be prevented more effectively.
Claims (4)
A second step of repairing cracks by injecting a repair material mixed with polybutylacrylic acid copolymer, cement, sand and water at a weight ratio of 1: 0.5 to 1.5: 0.5 to 1.5: 0.5 to 1.5 to the crack site of the concrete structure;
A third step of applying a primer adhesive made of a polybutylacrylic acid copolymer on the surface of the concrete structure and drying the same;
A fourth step of applying and drying a coating water repellent agent made of a water-soluble ethylene vinyl acetate-based copolymer resin composition on the undercoat agent one to three times;
A fifth step of applying a high-strength mortar to the coating film waterproofing agent to a thickness of 1 to 10;
A crack repair method for a concrete structure.
Wherein the polybutylacrylic acid copolymer used in the second and third steps is obtained by emulsion-polymerizing polybutylacrylic acid, polyethylacrylic acid, polystyrene, and polyacrylic acid with water.
(A) 50 to 60% by weight of a water-soluble ethylene vinyl acetate-based copolymer, (B) 20 to 30% by weight of a water-soluble acrylic emulsion resin, And 10 to 20% by weight of a polybutylacrylic acid copolymer (C) having a solid content of 40 to 60% by weight and a viscosity of 5,000 to 10,000 cps (25).
Wherein the high-strength mortar used in the fifth step has a compressive strength (20 basis) after 28 days of application of 300 kgf / or more.
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| KR102329523B1 (en) * | 2021-04-22 | 2021-11-22 | 주식회사 다우 | Seismic reinforcement and repair and reinforcement method for cracked and detached areas of concrete structure |
| KR102342746B1 (en) | 2021-06-11 | 2022-01-03 | 대유건설 주식회사 | Concrete crack repair material and concrete structure repair mathod using the same |
| CN115724687A (en) * | 2022-11-14 | 2023-03-03 | 北京易晟元环保工程有限公司 | Multi-component material for repairing concrete cracks of cooling tower and construction method |
| CN115724687B (en) * | 2022-11-14 | 2024-03-12 | 华能莱芜发电有限公司 | Multicomponent material for repairing concrete cracks of cooling tower and construction method |
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