KR102293741B1 - Crack repair method for building structure - Google Patents

Abstract

A method for repairing cracks in an exterior wall of a building structure according to the present invention comprises steps of: removing impurities from a construction target surface and performing pretreatment; forming a corrosion-preventing layer by applying a corrosion-preventing material to the construction target surface; forming a waterproofing layer by applying a waterproofing material to the upper surface of the corrosion-preventing layer; attaching a fiber sheet including polyester nanofibers to a crack occurrence site of the construction target surface; impregnating the waterproofing material in the fiber sheet by applying the waterproofing material to the upper surface of the fiber sheet; and forming a repair layer by applying a crack repair material containing calcite to the upper surface of the waterproof layer including the upper surface of the fiber sheet impregnated with the waterproofing material.

Description

A method of repairing cracks in the exterior wall of a building structure

The present invention relates to a primer for repairing cracks in a building structure and a method for repairing cracks in a building structure using the same, and in more detail, it is easy to fill and harden cracks occurring on the exterior and interior of a building structure, so that the crack can be effectively repaired and leaks It relates to a method for repairing cracks in the exterior wall of a building structure that can prevent

Concrete generally consists of aggregates such as water, cement, sand, and gravel, and is dried through a hydration reaction in which cement and water react and harden, and is used to form building structures.

Cracks in concrete structures are divided into material cracks and structural cracks, and the causes of these cracks are due to various causes, such as material causes, construction causes, causes according to the environment of use, and external forces.

At this time, if the cracks are left unattended, there is a problem that the load and vibration can be concentrated in the cracks with weak strength and the cracks can expand, and water and oxygen seep into the cracks, which lowers the pH of the concrete, which must maintain alkalinity. .

In order to repair these cracks, the putty method that fills the cracks with a material is being applied, and the existing putty method has a variety of experiences because the preparation process is complicated by separately providing a putty for filling cracks and a primer for forming an upper layer. and skilled contractors are required.

As a prior art for this, Korean Patent Registration No. 10-2037809 (title of invention: external crack repair method of concrete structure) has been registered.

The prior art includes the steps of washing while removing foreign substances from the site to be repaired; repairing the pitted or cracked part of the part to be repaired; and finishing by applying an external water-based paint to the area to be repaired, wherein the repairing includes filling the area to be repaired with mortar and curing it to restore the cross section; and the repair site applying a putty material to the; At least one step is performed in the above, and the mortar is a mixture of an ethylene-vinyl acetate (EVA) resin emulsion containing acetacetylated polyvinyl alcohol, a mortar strengthening agent containing calcium carbonate and a water-soluble hydrazine derivative, and Remital, The putty material is 30-40 wt% of an ethylene-vinyl acetate resin emulsion, 40-50 wt% of calcium carbonate surface-treated with an organic titanium compound, 5-10 wt% of an anionic aqueous polyurethane emulsion, 0.05-0.3 wt% of a corrosion inhibitor, Consists of a composition containing 1 to 5% by weight of a curing retarder and 13 to 20% by weight of a thickener, and the calcium carbonate surface-treated with the organic titanium compound is 1 part by weight of the organic titanium compound, 1 to 1,000 parts by weight of the organic solvent and A method for repairing external cracks in a concrete structure is presented, characterized in that it is prepared by mixing and drying a surface treatment agent comprising 0.05 to 0.3 parts by weight of a surfactant; and aqueous calcium carbonate.

According to the prior art, the composition of the putty and the method for repairing the cracks by injecting mortar or putty are presented. There was a problem, and in the case of the filling method used for larger cracks, the concrete had to be partially cut along the crack, so the steps for repair were very complicated and took a long time.

Therefore, in order to solve the above-described problems, there is a need to develop a method for repairing cracks in the exterior wall of a building structure, which improves the waterproofness and watertightness of the building structure while performing repair on the cracked area.

The present invention has been devised to overcome the problems of the above technology, and a main object of the present invention is to solve the problems of the putty injection method in the crack repair step, and to provide a crack repair method that maximizes water retention and watertightness.

Another object of the present invention is to provide a composition of a crack repair material capable of maximizing the strength of the coating film.

Another object of the present invention is to provide a composition of a waterproofing material capable of preventing internal corrosion of a building structure.

Another object of the present invention is to provide a composition of a waterproofing material with increased durability while maximizing waterproofness.

In order to achieve the above object, there is provided a method for repairing cracks in an exterior wall of a building structure according to the present invention, the method comprising: removing impurities on a construction target surface and performing pretreatment; forming a corrosion-preventing layer by applying a corrosion-preventing material to the construction target surface; forming a waterproofing layer by applying a waterproofing material to the upper surface of the corrosion-resistant layer; attaching a fiber sheet containing polyester nanofibers to a crack occurrence site of the construction target surface; impregnating the waterproofing material in the fiber sheet by applying a waterproofing material to the upper surface of the fiber sheet; and forming a repair layer by applying a crack repair material containing calcite to the upper surface of the waterproof layer including the upper surface of the fiber sheet impregnated with the waterproof material.

In addition, the crack repair material includes 40 to 60 parts by weight of calcite powder, 25 to 35 parts by weight of an acrylic emulsion, 3 to 15 parts by weight of titanium dioxide powder, 5 to 10 parts by weight of purified water, and 1 to 5 parts by weight of polysiloxane. characterized in that

In addition, the corrosion inhibitor is characterized in that it comprises 40 to 55 parts by weight of ethylene vinyl acetate, 25 to 40 parts by weight of purified water, 5 to 15 parts by weight of polyvinyl acetate, and 1 to 5 parts by weight of latex.

Additionally, the waterproofing material comprises 50 to 70 parts by weight of ethylene vinyl acetate, 15 to 25 parts by weight of an acrylic emulsion, 10 to 20 parts by weight of polyvinyl acetate, and 1 to 5 parts by weight of vinyl acetate.

According to the method for repairing cracks in the outer wall of a building structure according to the present invention,

1) By attaching a chip-type fiber sheet without injecting putty, it provides a new method for repairing cracks in external walls that can repair cracks without injecting putty and prevent internal corrosion,

2) The crack repair material containing calcite powder enhances the strength of the repair layer and maximizes oxidation resistance and chemical resistance.

3) It is possible to prevent moisture from penetrating into the concrete structure and to prevent corrosion of the reinforcing bars inside the structure through the composition of the anti-corrosion material with excellent anti-fungal properties.

4) It has the effect of providing a composition of waterproofing material that maximizes chemical resistance, oxidation resistance, and durability of the coating film while increasing waterproofness and watertightness.

1 is a flowchart illustrating a method for repairing cracks in an outer wall of a building structure of the present invention.
2 is a cross-sectional view showing a repair coating film laminated by a crack repair method.
3 is a flowchart illustrating a method of manufacturing a physical property enhancing agent.
4 is a flowchart illustrating a method for preparing a surface modifier.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The accompanying drawings are not drawn to scale, and like reference numbers in each drawing refer to like elements.

1 is a flowchart illustrating a crack repair method of an exterior wall of a building structure of the present invention, and FIG. 2 is a cross-sectional view illustrating a repair coating film laminated by a crack repair method.

1 and 2, the method for repairing cracks in the outer wall of a building structure of the present invention includes a pretreatment performing step, a corrosion prevention layer forming step, a waterproof layer forming step, a fiber sheet attachment step, a waterproofing material impregnation step, and a repair layer forming step. characterized in that

(S11) pre-processing step

First, pretreatment is performed on the surface of the structure on which the crack has occurred, that is, the construction target surface 1 including the crack occurrence site 2 . In this case, the pre-treatment may be referred to as a process of removing impurities on the construction target surface 1 and leveling the uneven surface.

Therefore, as a pretreatment, it is possible to remove dust, concrete fragments, etc. that may exist on the construction target surface 1, and at this time, impurities may be removed by various methods such as blowing and brushing. In addition, when the surface is uneven, a separate planarization treatment may be performed on the surface to clean up the flat and uneven surface.

In addition, if moisture is contained in the crack generating site 2 included in the construction target surface 1, it may be desirable to remove the moisture in the crack generating site 2, and in addition, a known surface pretreatment process, etc. Of course, this can be done.

(S12) Corrosion prevention layer formation step

Next, the corrosion prevention material is applied to the construction target surface (1) to prevent mold from growing on the entire construction target surface (1) where cracks and crack repair are performed, or corrosion occurs in the steel structure embedded in the concrete structure. prevent. The corrosion inhibitor is preferably applied to the entire surface of the construction surface 1, that is, the entire construction surface 1 including the crack occurrence site 2, and the corrosion inhibitor is applied to the construction object surface through drying for a predetermined time after application. A corrosion prevention layer (3) is formed on the surface of (1).

At this time, the corrosion inhibitor is not limited to the component composition as long as it can increase the watertightness and oxidation resistance of the structure, but preferably 40 to 55 parts by weight of ethylene vinyl acetate, 25 to 40 parts by weight of purified water, 5 to 5 parts by weight of polyvinyl acetate 15 parts by weight, characterized in that it contains 1 to 5 parts by weight of latex.

Ethylene-Vinyl Acetate is a copolymer resin of ethylene and acetic acid that has excellent transparency, adhesion, and flexibility. It does not harden at low temperatures and does not soften at high temperatures, so it can be used in all seasons, has strong oxidation resistance and is non-toxic.

Poly(vinyl acetate) is commonly used to increase adhesion, and is used as a coating agent or as a latex material in acrylic latex paint. In the present invention, it is included to increase adhesion and coating properties.

Latex includes both natural latex and synthetic latex. Preferably, latex refers to a material in which fine polymer particles are dispersed in an aqueous solution. In addition, natural latex refers to rubber refined from the latex extracted by making a wound on the epidermis of a plant. Synthetic latex is a dispersion product of synthetic rubber manufactured based on petrochemical-derived vinyl monomers such as styrene and butadiene. means Preferably, SB latex based on styrene-butadiene may be used as the latex of the present invention in order to increase the adhesion of the coating layer and increase the coating efficiency to increase the acid resistance of the corrosion prevention layer.

These ethylene vinyl acetate, polyvinyl acetate, and latex are dissolved through purified water to form an aqueous corrosion inhibitor.

Therefore, by applying such a corrosion inhibitor to form the corrosion prevention layer 3, the surface of the construction target surface 1 including the cracked area is coated with the corrosion inhibitor to increase the watertightness, and the waterproofing material to be described later is better adhered It provides an environment that can be used to prevent corrosion of steel structures that can be exposed at cracks, and it can suppress the formation of mold, etc., that can occur when exposed to moisture.

(S13) waterproof layer formation step

Next, a waterproofing material is applied to the upper surface of the anticorrosion layer 3 to form a waterproofing layer 4 . Preferably, the waterproofing material may be a waterproofing material capable of forming a coating film having high viscosity and elasticity. The waterproofing material may be applied 1 to 5 times on the upper surface of the anticorrosion layer, and the waterproofing material forms the waterproofing layer 4 through drying treatment after application.

Here, the composition of the waterproofing material is not specifically limited, but preferably includes 50 to 70 parts by weight of ethylene vinyl acetate, 15 to 25 parts by weight of acrylic emulsion, 10 to 20 parts by weight of polyvinyl acetate, and 1 to 5 parts by weight of vinyl acetate. A waterproofing material may be used.

Ethylene vinyl acetate is a copolymer resin of ethylene and acetic acid that has excellent transparency, adhesion, and flexibility as described above.

Polyvinyl acetate is also generally used to increase adhesiveness as described above, and is said to be used as a latex material in a coating agent or acrylic latex paint. In the present invention, it is included to increase adhesion and coating properties.

Acrylic emulsion is an acrylic resin with excellent adhesion. Basically, it may be composed of an acrylic acid ester or a methacrylic acid ester, further comprising an unsaturated carboxylic acid, an acrylic monomer, and the like. At least one of acrylic acid, methacrylic acid, crotonic acid, itaconic acid, and maleic acid may be used as the unsaturated carboxylic acid. As the acrylic monomer, at least one of acrylonitrile, acrylamide, N-hydroxyacrylamide, N-butoxy methylacrylamide, styrene, and vinyl acetate may be used. It does not discolor even when exposed to the outdoors, has good chemical resistance, and has good electrical insulation and water resistance.

Vinyl acetate is a polymer commonly used in the manufacture of plastics and films, and is used for various purposes such as adhesives, paints, fabrics, paper, and bases for chewing gum. When added, it helps to improve adhesion and can play a role in viscosity control.

Therefore, it is possible to form the waterproof layer 4 having high adhesion and excellent acid resistance and chemical resistance through such a waterproofing material, thereby protecting the surface of the concrete structure and forming a dense water-resistant film on the surface of the cracked area.

(S14) Fiber sheet attachment step

Next, the fiber sheet 5 is attached to the crack generating region 2 of the construction target surface 1, that is, the cracked region to reinforce the crack generating region 2 and prevent further cracking. At this time, attaching the fiber sheet 5 to the crack generating region means filling the crack generating region 2 with the fiber sheet 5 . Here, the fiber sheet 5 may be formed in a wide panel type and may fill the crack generation site 2 of the construction target surface 1, but preferably a small-sized fiber sheet 5 such as a chip is used. It is possible to attach the fiber sheet 5 to the crack occurrence region 2 by filling the crack occurrence region 2 of the construction target surface 1 .

Here, there is no particular limitation on the material of the fiber sheet 5, but preferably, it may be made of polyester nanofibers. The fiber sheet 5 may be attached before the waterproof layer 4 is completely dried, and may be attached without a separate adhesive, but a separate adhesive may be further used for attaching the fiber sheet 5 . Alternatively, a fiber sheet 5 made of a chip-type polyester nanofiber is attached to the upper surface of the waterproof layer 4 that has not been completely dried, and high-pressure water is sprayed onto the fiber sheet 5 in a water punching method. can also be attached.

Here, the polyester nanofiber used as the fiber sheet 5 is economical, has high strength, is strong in abrasion, has little hygroscopicity and absorbency, has excellent chemical resistance, and has excellent antifungal properties. Accordingly, by attaching and filling the fiber sheet 5 to the crack generating region 2 , the crack generating region 2 can be protected and further cracking can be suppressed.

(S15) waterproofing material impregnation step

Next, a waterproofing material impregnation step of impregnating the waterproofing material in the fiber sheet 5 by applying a waterproofing material to the upper surface of the attached fiber sheet 5 is performed. Since the fiber sheet 5 contains fine pores, a waterproofing material is applied between the pores so that the fiber sheet 5 is impregnated with the waterproofing material. At this time, in order to impregnate the fiber sheet 5 with a waterproofing material, a waterproofing material may be applied to the surface of the fiber sheet 5, but when a large amount of the fiber sheet 5 is attached because the cracking area 2 is wide, a liquid waterproofing material may be poured onto the fiber sheet 5 to impregnate the waterproofing material.

Here, the waterproofing material may be the same waterproofing material as the above-described waterproofing layer 4, or by adding a viscosity modifier to the above-described waterproofing material to partially lower the viscosity, thereby making it easier to modify the waterproofing material for impregnation.

In addition, when the waterproofing material is impregnated as described above, a predetermined drying process is performed at room temperature to provide sufficient time for the waterproofing material impregnated in the fiber sheet 5 to be dried.

(S16) forming a repair layer

Finally, a crack repair material is applied to the upper surface of the waterproof layer 4 and the upper surface of the fiber sheet 5 impregnated with the waterproofing material, that is, the entire surface of the construction target surface 1, and dried to form a repair layer 6 and repair external wall cracks. finish Here, the crack repair material is applied not only to the upper surface of the fiber sheet 5 impregnated with the waterproofing material, but also to the entire surface of the construction target surface 1, that is, the entire upper surface of the above-described waterproofing layer 4 through the above-described waterproofing material impregnation process.

Such a crack repair material can be referred to as a kind of top coat, but preferably, the surface is finished with a crack repair material having high elasticity and high film strength, thereby minimizing leakage in the future and maximizing the efficiency of maintenance.

To this end, the crack repair material preferably contains calcite powder, where calcite is a main component of limestone, marble, and chalk, and serves as an inorganic filler and has high mechanical strength. It plays the role of allowing the crack repair material to form a harder film.

Therefore, by applying a crack repair material containing calcite powder to the upper surface of the waterproofing layer 4 and the upper surface of the fiber sheet 5 impregnated with the waterproofing material and drying it to form the repairing layer 6, high mechanical strength, corrosion resistance, and resistance A water-retaining layer having both oxidation properties can be formed.

In addition, the crack repair material is preferably composed of 40 to 60 parts by weight of calcite powder, 25 to 35 parts by weight of acrylic emulsion, 3 to 15 parts by weight of titanium dioxide powder, 5 to 10 parts by weight of purified water, and 1 to 5 parts by weight of polysiloxane. can

Here, it was said that calcite powder performs the role of an inorganic filler and exhibits high mechanical strength as described above, and in the case of purified water, it is added to increase the mixability of the materials contained in the crack repair material and to adjust the viscosity at the same time.

As described above, the acrylic emulsion is an acrylic resin that does not discolor even when exposed to the outdoors, has good chemical resistance, and has good electrical insulation and water resistance. For the description of the acrylic emulsion, refer to the above description, so a detailed description will be omitted.

Titanium dioxide powder, also called titania powder, has excellent hiding power and is generally used as a water-based paint. According to this titanium dioxide addition, the effect of improving the film strength can be expected.

Polysiloxane is a conductive organic material that can form a hard film, so that when added as an active ingredient in a crack repair material, durability is increased, antifouling property is improved, and an anti-blocking effect can be expected at the same time. . In addition, by forming a clear and transparent coating film, it is possible to improve the appearance of the coated construction surface.

Therefore, through such a crack repair material, it is possible to form the repair layer 6 with excellent coating film strength, good adhesion, anti-blocking effect and antifouling properties, and also have a beautiful appearance.

In addition, the corrosion inhibitor may further include 5 to 10 parts by weight of a physical property enhancer including vinyl acetate-butyl acrylate copolymer.

The vinyl acetate-butyl acrylate copolymer, which is an active ingredient of the physical property reinforcing agent, not only can improve the mechanical strength of the crack repair material, but can also improve the adhesion of the crack repair material when added, thereby improving the durability of the formed repair layer 6 there is

However, the physical property enhancing agent may further include additional other components as well as the vinyl acetate-butyl acrylate copolymer, which will be described with reference to the drawings as follows.

3 is a flowchart illustrating a method for manufacturing a physical property enhancing agent.

Referring to FIG. 3 , the physical property enhancing agent of the present invention is characterized in that it is manufactured through the steps of preparing a first solution, preparing a second solution, and completing the physical property enhancing agent.

(S21) preparing a first solution

First, 30 to 60 parts by weight of vinyl acetate-butyl acrylate copolymer, 5 to 20 parts by weight of acrylic acid, and 30 to 65 parts by weight of polyvinyl alcohol are mixed to prepare a first solution. manufacture

As described above, the vinyl acetate-butyl acrylate copolymer is said to have the effect of enhancing the adhesion strength as well as improving the mechanical strength of the water-retaining layer formed when added as a physical property strengthening agent.

Acrylic acid is the simplest unsaturated carboxylic acid containing a carboxylic acid and a vinyl group, and has the effect of not only increasing the viscosity of the physical property enhancer produced when added, but also improving adhesion.

Polyvinyl alcohol is added as a solvent of the first solution, is thermoplastic and oil-resistant, and is also used as an adhesive and coating agent. Therefore, according to the addition of polyvinyl alcohol, the miscibility of the acrylic acid and vinyl acetate-butyl acrylate copolymer is increased, and there is an effect of improving adhesion and coating properties at the same time.

(S22) preparing a second solution

Next, 60 to 80 parts by weight of the first solution, 10 to 30 parts by weight of poly(2-ethylhexyl acrylate), and 3 to 10 parts by weight of tetradecyl trimethylammonium bromide are mixed to prepare a second solution. manufacture

Poly(2-ethylhexyl acrylate) added here is a polymer added to improve processability. It has an excellent modulus of elasticity compared to conventional thermoplastic elastomers, and is not destroyed even when external pressure is applied. It has excellent resistance properties. Therefore, when such poly(2-ethylhexyl acrylate) is added, the pressure workability of the surface is improved, so that the surface of the water-retaining layer 6 can be prevented from falling off even when pressure is applied from the outside.

Tetradecyl trimethyl ammonium bromide (Tetradecyl Trimethyl Ammonium Bromide) has an effect of increasing the miscibility of the various resin components included in the first solution and the second solution by performing the role of a surfactant.

(S23) Step of completing the physical property strengthening agent

Finally, 75 to 90 parts by weight of the second solution, 5 to 15 parts by weight of polyisobutylene, and 3 to 10 parts by weight of a surface modifier including cerium oxide nanoparticles are mixed to provide physical properties Complete the reinforcement.

Polyisobutylene is a synthetic rubber composed of a polymer of 2-methyl-1-propene. It is a colorless or pale yellow, sticky, elastic rubber-like semi-solid, environmentally friendly enough to be added to gum, and harmless to the human body. In addition, when polyisobutylene is added, it is possible to prevent a defect that becomes hard in cold and cold weather and becomes soft in hot weather, so that the surface of the added water retention layer 6 can maintain an appropriate level of hardness.

The surface modifier containing cerium oxide nanoparticles can be expected to improve the hardness of the water-retaining layer formed when added to the physical property enhancer, and furthermore, the cerium oxide nanoparticles have a large surface area and are applied to the surface through excellent oxidation/reduction action. By forming a dense film, the internal protection effect through the film is high, so when it is added to a crack repair material, it has an excellent effect of increasing durability.

Therefore, through the addition of such a physical property reinforcing agent, it is possible to increase the adhesion and at the same time increase the strength of the created water retention layer, and control the hardness of the surface to prevent the water retention layer from being destroyed even when external pressure is applied, and at the same time have excellent durability. .

In addition, the surface modifier may further include an additional composition in addition to the cerium oxide nanoparticles. A method for preparing such a surface modifier will be described with the drawings as follows.

4 is a flowchart illustrating a method for preparing a surface modifier.

Referring to FIG. 4 , the surface modifier of the present invention is characterized in that it is prepared through the steps of preparing a primary solution, preparing a secondary solution, and completing the surface modifier.

(S31) preparing the first solution

A first solution is prepared by mixing 15 to 25 parts by weight of cerium oxide nanoparticles, 5 to 15 parts by weight of polydimethyldiphenyl siloxane, and 60 to 80 parts by weight of purified water.

As described above, the cerium oxide nanoparticles have a large surface area and form a dense film on the surface through excellent oxidation/reduction action, so that the internal protection effect through the film is high.

Polydimethyldiphenyl siloxane is a curable siloxane and has the property of modifying the surface of the resin. In addition, it is possible to increase the adhesion of the film when added.

These cerium oxide nanoparticles and polydimethyldiphenyl siloxane form a dispersed primary solution through purified water, where dispersion through a stirrer is preferably applied for smooth dispersion of the cerium oxide nanoparticles.

(S32) preparing a secondary solution

Next, 85 to 90 parts by weight of the first solution and 2,4,6-trimethyl-2,4,6-trivinylcyclotrisilazane (2,4,6-trimethyl-2,4,6-trivinylcyclo trisilazane) ) 3 to 10 parts by weight and 3 to 5 parts by weight of sesquiterpene are mixed to prepare a secondary solution.

2,4,6-trimethyl-2,4,6-trivinylcyclotrisilazane (2,4,6-trimethyl -2,4,6-trivinyl cyclo trisilazane) is a kind of inorganic silazane polymer and has an inorganic structure. Since only hydrogen atoms are bonded without carbon to the surface, there is no yellowing phenomenon even when cured, and a very transparent network is formed.

Sesquiterpenes are terpenes with 15 carbons composed of three isoprene units, and together with monoterpenes, are the main components of aromatic oils extracted from plants. It provides resistance to pathogens and is composed of farnesene, zingiberene, bisabolene, humulene, and patchouli, and is well known as a defense material against microorganisms. . In addition, of course, it has a refreshing and unique scent, so that you can feel a refreshing feeling of use. Therefore, when sesquiterpene is included as an active material, the prepared water retaining layer 6 can provide a protective function against microorganisms, thereby providing both antibacterial properties.

(S33) Step of completing the surface modifier

Finally, 90 to 95 parts by weight of the secondary solution, 3 to 5 parts by weight of 3-aminopropyl trimethoxysilane, 1,6-hexanediol diglycidyl ether (1,6-Hexanediol diglycidyl) ether) 1 to 5 parts by weight to complete the surface modifier.

3-Aminopropyl trimethoxysilane (3-Aminopropyl trimethoxysilane) is a material added to improve adhesion. When 3-aminopropyl trimethoxysilane is added, the coating property of the film is increased as well as the effect of improving adhesion. have.

1,6-Hexanediol diglycidyl ether (1,6-Hexanediol diglycidyl ether) is a chemical substance having two or more epoxy groups in its molecule. When added, it serves to provide flexibility to the repair layer.

Therefore, when such a surface modifier is added, the coating property of the film is increased, chemical resistance and chemical resistance are improved, and at the same time, a certain level of hardness as well as flexibility is provided to the repair layer, and there is an effect of increasing the water resistance of the film.
As described so far, the method for repairing cracks in the outer wall of a building structure according to the present invention has been expressed in the above description and drawings, but this is only an example and the spirit of the present invention is not limited to the above description and drawings, Of course, various changes and modifications are possible without departing from the technical idea.

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1: Construction target surface 2: Crack occurrence site
3: anti-corrosion layer 4: waterproof layer
5: Fiber sheet 6: Repair layer

Claims (9)

A method for repairing cracks in an exterior wall of a building structure, the method comprising:
removing impurities from the construction target surface and performing pretreatment;
forming a corrosion-preventing layer by applying a corrosion-preventing material to the construction target surface;
forming a waterproofing layer by applying a waterproofing material to the upper surface of the corrosion-resistant layer;
attaching a fiber sheet containing polyester nanofibers to a crack occurrence site of the construction target surface;
impregnating the waterproofing material into the textile sheet by applying the waterproofing material to the upper surface of the textile sheet;
40 to 60 parts by weight of calcite powder, 25 to 35 parts by weight of an acrylic emulsion, 3 to 15 parts by weight of titanium dioxide powder, 5 to 10 parts by weight of purified water on the upper surface of the waterproofing layer including the upper surface of the fiber sheet impregnated with the waterproofing material Forming a repair layer by applying a crack repair material containing 1 to 5 parts by weight of polysiloxane by weight; delete The method of claim 1,
The corrosion inhibitor is
40 to 55 parts by weight of ethylene vinyl acetate, 25 to 40 parts by weight of purified water, 5 to 15 parts by weight of polyvinyl acetate, and 1 to 5 parts by weight of latex. The method of claim 1,
The waterproofing material is
50 to 70 parts by weight of ethylene vinyl acetate, 15 to 25 parts by weight of an acrylic emulsion, 10 to 20 parts by weight of polyvinyl acetate, and 1 to 5 parts by weight of vinyl acetate. The method of claim 1,
The crack repair material is
Further comprising 5 to 10 parts by weight of a physical property enhancing agent comprising a vinyl acetate-butyl acrylate copolymer,
The physical property enhancing agent,
A first solution is prepared by mixing 30 to 60 parts by weight of vinyl acetate-butyl acrylate copolymer, 5 to 20 parts by weight of acrylic acid, and 30 to 65 parts by weight of polyvinyl alcohol. step;
60 to 80 parts by weight of the first solution, 10 to 30 parts by weight of poly(2-ethylhexyl acrylate), and 3 to 10 parts by weight of tetradecyl trimethylammonium bromide to prepare a second solution step;
75 to 90 parts by weight of the second solution, 5 to 15 parts by weight of polyisobutylene, and 3 to 10 parts by weight of a surface modifier containing cerium oxide nanoparticles are mixed to form a physical property strengthening agent Completing the step; characterized in that manufactured through, the exterior wall crack repair method of the building structure. 6. The method of claim 5,
The surface modifier,
Preparing a first solution by mixing 15 to 25 parts by weight of cerium oxide nanoparticles, 5 to 15 parts by weight of polydimethyldiphenyl siloxane, and 60 to 80 parts by weight of purified water;
85 to 90 parts by weight of the first solution, 2,4,6-trimethyl-2,4,6-trivinylcyclotrisilazane (2,4,6-trimethyl-2,4,6-trivinylcyclo trisilazane) 3 to 10 parts by weight and 3 to 5 parts by weight of sesquiterpene to prepare a secondary solution;
90 to 95 parts by weight of the secondary solution, 3 to 5 parts by weight of 3-aminopropyl trimethoxysilane, 1,6-hexanediol diglycidyl ether (1,6-Hexanediol diglycidyl ether) Completing the surface modifier by mixing 1 to 5 parts by weight; characterized in that produced through, the crack repair method of the exterior wall of the building structure. delete delete delete

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