KR102651376B1 - Repairing, Waterproofing method of concrete structure - Google Patents

Abstract

The present invention relates to a waterproofing and painting method including repairing cracks in a concrete structure, and more specifically, to the steps of identifying cracks in a concrete structure and removing foreign substances, filling the area from which the foreign substances were removed with a crack finishing material, and , including the step of preparing the surface, wherein the crack finishing material is 10 to 40% by weight of water-soluble phenoxy resin, 1 to 5% by weight of silane coupling agent, 1 to 5% by weight of zinc chromite, and 10 to 20% of nanotype ceramic balls. % by weight, it is characterized in that it contains 1 to 5 wt% of shungite powder and the remainder of the solvent. According to the crack repair and waterproofing method of a concrete structure according to the present invention, physical properties such as water resistance, adhesion strength, extensibility, bending resistance, and heat insulation are excellent, and the crack area is self-healing due to self-healing properties, thereby improving the coating film. It has the advantage of increasing durability.

Description

Waterproofing method including crack repair of concrete structure {Repairing, Waterproofing method of concrete structure}

The present invention relates to a waterproofing method including repairing cracks in concrete structures. More specifically, it has excellent adhesive strength, as well as excellent physical properties such as tensile strength, durability, and contamination resistance, and stably waterproofs cracks in the structure. and waterproofing methods, including repairing cracks in paintable concrete structures.

Concrete is the most efficient building material made up of a combination of compressive material called concrete and tensile material called rebar, but reinforced concrete structures are constantly changing due to changes in the external environment such as temperature changes, harmful gases, and vibration, and cannot be completed in one construction or repair. It cannot be permanently preserved through . In other words, reinforced concrete structures are exposed to various problems due to concrete behavior and moisture inflow over time, which shortens its lifespan.

Representative examples include corrosion of rebar caused by external cracks in apartments and corrosion of concrete caused by carbon dioxide gas. First, cracks occur as they branch out, and rainwater flows into the reinforcing bars through the cracks, promoting corrosion of the reinforcing bars. When the reinforcing steel corrodes and expands, the parts where the concrete cover is insufficient are damaged and the reinforcing bars placed inside are exposed, and rainwater flowing in through the crack continues to move inside the structure while corroding the reinforcing bars. Second, when concrete comes into contact with carbon dioxide gas, a neutralization (aging) phenomenon occurs where the concrete changes to calcium carbonate and water and becomes brittle. This phenomenon causes users of the structure to feel at risk for the stability of the structure, and in fact, it is a cause that seriously undermines the stability of the structure.

Additionally, there is a high possibility of water leakage through microcracks around balcony railings, rooftop railings, window frames exposed around openings, rooftop bits, and structures. The possibility of such water leaks occurs through cracks that occur after construction, cold joints created during concrete pouring, or voids where materials are separated. In addition, cold air flows into the unit through microcracks, causing moisture and mold on the floors, walls, etc. It may also cause it to occur.

Since these problems impair the comfort of living and the durability of reinforced concrete over time, periodic maintenance methods are needed to solve them. If the level of maintenance is not improved as the years pass, difficult maintenance situations will arise.

For such maintenance, external cracks in concrete structures such as apartments or apartments are repaired over a certain period of time. Known repair methods include the film repair method, filling repair method, injection repair method, and structural reinforcement method. I can hear it.

The film-type repair method is a repair method that applies a film using a crack repair material to the fine crack area, and the filling-type repair method involves V-cutting and U-cutting to secure the adhesive area between the crack repair material and the existing matrix, and then repairing the crack. It is a repair method that fills the repair material, and the injection repair method is used to solve large cracks (crack width of 1 mm or more) that penetrate the structure of the main structure, transverse cracks that occur for other reasons and pose a threat to the safety of the structure, and are not solved by the film repair method. This is a repair method that is applied by injection into non-water leaking cracks. Meanwhile, the structural reinforcement method is a repair method related to the stability of the structure and must be accompanied by safety diagnosis and reinforcement design, so it is usually excluded from general crack repair methods.

These repair methods had disadvantages such as poor elasticity, poor crack followability, and occurrence of lifting phenomenon, and a short maintenance period.

KR 10-1087700 B1

Therefore, the purpose of the present invention is to repair cracks in concrete structures that have excellent adhesive strength, excellent physical properties such as tensile strength, durability, corrosion resistance, and contamination resistance, and have excellent repair and waterproofing effects because cracks do not regenerate in the crack repair area. The purpose is to provide a waterproofing method including.

Another object of the present invention is to provide a waterproofing method including crack repair in concrete structures that prevents aging of buildings by suppressing deformation of the coating film due to thermal expansion by having an excellent heat insulation effect.

A waterproofing method including crack repair of a concrete structure of the present invention to achieve the above object includes the steps of checking the crack area of the concrete structure and removing foreign matter, filling the area from which the foreign matter was removed with a crack finishing material, It includes a step of preparing the surface, and the crack finishing material is 10 to 40% by weight of water-soluble phenoxy resin, 1 to 5% by weight of silane coupling agent, 1 to 5% by weight of zinc chromite, and 10 to 20% by weight of nanotype ceramic balls. %, 1 to 5 wt% of shungite powder, and the remainder of the solvent.

The crack finishing material further contains 1 to 5% by weight of a self-healing agent, and the self-healing agent is characterized in that it is manufactured by encapsulating isophorone diisocyanate with polyurethane.

The self-healing agent is characterized in that it is manufactured by encapsulating the isophorone diisocyanate and Stuckey fiber powder with polyurethane.

After the step of removing the foreign matter, it further includes V-cutting or U-cutting the cracked area from which the foreign matter has been removed, and filling the cut area with a filler, wherein the filler is 25 to 35% by weight of cement. , 10 to 20% by weight of quartz, 1 to 5% by weight of calcium hydroxide, 0.1 to 5% by weight of silica, 5 to 10% by weight of shungite powder, 1 to 2% by weight of pozzolan, and the balance of polyacrylonitrile. do.

The filler is characterized in that it further contains 1 to 2% by weight of partially carbonized cotton fiber and 1 to 2% by weight of duck down powder.

The filler is characterized in that it further contains 1 to 5% by weight of stucky fiber powder.

After filling the area from which the foreign matter was removed with a crack finishing material and preparing the surface, applying a primer to the surface of the structure, and applying the crack finishing material to form a surface waterproofing layer. .

According to the waterproofing method including crack repair of concrete structures according to the present invention, physical properties such as waterproofing, adhesion strength, extensibility, bending resistance, and heat insulation are excellent, and the crack area heals on its own due to self-healing properties, thereby forming a coating film. It has the advantage of being able to increase its durability.

Hereinafter, the present invention will be described in detail.

The waterproofing method including crack repair of a concrete structure according to the present invention includes the steps of checking the crack area of the concrete structure and removing foreign substances, filling the area from which the foreign matter was removed with a crack finishing material, and preparing the surface. Contains, the crack finishing material is 10 to 40% by weight of water-soluble phenoxy resin, 1 to 5% by weight of silane coupling agent, 1 to 5% by weight of zinc chromite, 10 to 20% by weight of nanotype ceramic balls, and 1 to 2% of shungite powder. It is characterized in that it contains ~5% by weight and the balance is solvent.

On the other hand, if the crack area is deep and wide, after the step of removing the foreign matter, the step of V cutting or U cutting the crack area from which the foreign matter was removed, and filling the cut area with a filler, It is advisable to fill the crack-filled area with a crack finishing material and proceed with the step of preparing the surface.

Hereinafter, the present invention will be described in detail in the attached steps.

Steps to check cracks in concrete structures and remove foreign substances

First, check the cracks in the concrete structure and remove any foreign substances. This is because if foreign substances such as dust are present during the filling of the crack finishing material in the post-process, the adhesiveness deteriorates.

The method of removing the foreign substances is not limited, and for example, high pressure washing water, brush, grinder, sand blasting, etc. can be used.

V-cutting or U-cutting the cracked area from which the foreign matter was removed

Next, if the crack area is wide and deep, V-cutting or U-cutting is performed on the cracked area from which the foreign matter has been removed. The cutting method is a conventional method, and detailed description thereof will be omitted.

This step is performed when the crack area is deep and wide, so it can of course be omitted.

Step of filling the cut area with filler

Then, filler is filled into the cut area.

In the present invention, the filler includes 25 to 35% by weight of cement, 10 to 20% by weight of quartz, 1 to 5% by weight of calcium hydroxide, 0.1 to 5% by weight of silica, 5 to 10% by weight of shungite powder, and 1 to 2% by weight of pozzolan. and the remainder containing polyacrylonitrile. The filler will be described again below. At this time, the filler is mixed with water at a weight ratio of 1:0.4 to 0.6.

The use of the above-mentioned filler has the advantage of further improving adhesion performance at the crack site, improving durability and strength, and improving crack followability due to excellent elasticity.

As explained previously, this step is also performed when the crack area is deep and wide, so it is natural that it can be omitted.

Filling the area filled with the filler with a crack finishing material and preparing the surface

Next, fill the crack area from which the foreign matter has been removed or the area filled with filler with a crack finishing material to a thickness of about 1 to 3 mm to prepare the surface. The crack finishing material of the present invention has excellent adhesion to concrete even without using a primer, and has the advantage of not causing lifting at the applied area.

For this purpose, the crack finishing material of the present invention contains 10 to 40% by weight of water-soluble phenoxy resin, 1 to 5% by weight of silane coupling agent, 1 to 5% by weight of zinc chromite, 10 to 20% by weight of nanotype ceramic balls, and shungite. It is characterized in that it contains 1 to 5% by weight of powder and the balance of solvent. The crack finishing material will be described again below.

At this time, the method of filling and applying the crack finishing material is not limited, and all methods such as roll application and spray squeeze are applied to fill, apply, and prepare the surface to prevent scale on the surface and to prevent separate painting work. Even if it is not done, the surface of the structure can be finished. It is natural to use the crack finishing material after application and surface preparation, by applying hot air and drying the surface temperature to 40°C to 70°C, or by drying it naturally.

In other words, the present invention not only makes it possible to omit separate painting work through the crack finishing material, but also effectively prevents the neutralized area from being deposited on the concrete and leaving powder behind, and reduces the curing shrinkage of the crack finishing material to improve crack followability. It is to raise it. In addition, the heat insulation effect is also excellent, and deformation of the coating film due to thermal expansion can be suppressed.

In addition, when applying a crack finishing material after filling the filler, it is natural to fill the crack finishing material only to a depth of 1 to 3 mm from the surface and then fill the surface finishing material.

Concrete structures repaired using the above method have the advantage that cracks are repaired efficiently, durability, adhesion, crack tracking, and heat insulation are excellent, and the crack repair and waterproofing effects of the concrete structure can be maintained for a long period of time.

In addition, the step of filling the area from which the foreign matter was removed with a crack finishing material and preparing the surface, applying a primer to the surface of the structure, and applying the crack finishing material to form a surface waterproofing layer may be further included. .

In other words, if there is a need to form an additional waterproofing layer overall, the above-mentioned process is added because the crack finishing material of the present invention is an excellent waterproofing and heat-insulating coating material. At this time, the application of the primer and the application of the crack finishing material follow methods known in the field to which this technology belongs.

Hereinafter, the crack finishing material used in the present invention will be described in detail.

The crack finishing material is 10 to 40% by weight of water-soluble phenoxy resin, 1 to 5% by weight of silane coupling agent, 1 to 5% by weight of zinc chromite, 10 to 20% by weight of nanotype ceramic balls, and 1 to 5% by weight of shungite powder. % and the balance of solvent.

The water-soluble phenoxy resin is a base resin for crack finishing materials and prevents the paint film from lifting by increasing adhesion to the structure. The water-soluble phenoxy resin is preferably included in 10 to 40% by weight in the crack finishing material.

The silane coupling agent is for the water-soluble phenoxy resin, ceramic ball, etc., and includes 3-Glycidoxypropyltrimethoxy silane and 3-Glycidoxypropylmethyldimethoxy silane. , 2-(3,4-Epoxycyclohexy)ethyltrimethoxy silane, 3-Glycidoxypropyltriethoxysilane, aminosilane and one or more selected from the group consisting of vinyl silanes.

The silane coupling agent is preferably included in 1 to 5% by weight in the crack finishing material.

The zinc chromite is included to increase strength and corrosion resistance, and improves corrosion resistance when reinforcing bars, etc. are exposed through cracks.

The zinc chromite is preferably included in 1 to 5% by weight in the crack finishing material.

The nanotype ceramic ball is an ingredient that not only helps form a dense film but also provides heat insulation properties, and is made of aluminum silicate. all. In other words, since these nanotype ceramic balls are porous, they have excellent heat reflection and heat resistance through the ceramic film of the fine closed air layer, thereby ensuring the excellent heat shielding effect of the coating film.

At this time, the particle size of the ceramic ball is preferably 5 to 100 nm. If the particle size is too large, the processability of the coating film is reduced, and if the particle size is too small, the light scattering effect is reduced and the heat shield effect is reduced.

The nanotype ceramic balls are preferably included in 10 to 20% by weight in the crack finishing material for sufficient heat shielding effect.

The shungite powder is a material containing SiO ₂ (silicate) and C60 (fullerene) as main ingredients, and has the function of purifying and decomposing contaminants, as well as sterilizing and antibacterial functions, thereby increasing environmental friendliness as well as strength. It plays a role in significantly increasing . In addition, it prevents the growth of bacteria and fungi, thereby suppressing the occurrence of cracks. In addition, when used with nano-type ceramic balls, the reflectivity in the radio wave band can be improved and heat insulation can also be improved.

The above Sungite powder can be used for elite Sungite as well as normal Sungite, and the type is not limited, and the particle size of 100 to 325 mesh is sufficient.

The shungite powder is preferably included in 1 to 5% by weight in the crack finishing material.

And water is used as the solvent, and is included as the remainder. In addition, it is natural that conventional additives such as antifoaming agents and leveling agents may be included in addition to the above ingredients.

Meanwhile, the crack finishing material preferably further contains 1 to 5% by weight of a self-healing agent.

The self-healing agent is manufactured by encapsulating isophorone diisocyanate with polyurethane. When a damaged area occurs, the polyurethane prepolymer microcapsules are decomposed and isophorone diisocyanate quickly flows out to the damaged area, reacting with moisture and air. The damaged area is filled with a highly elastic resin film to heal the crack. This self-healing agent synthesizes a polyurethane prepolymer, heats the synthesized polyurethane prepolymer and dissolves it in chlorobenzene as a solvent, isophorone diisocyanate is added thereto, stirred, and gum arabic is added again and stirred. It can be prepared by cooling and grinding.

In addition, the self-healing agent decomposes the capsule when an external force is applied to the film and a crack occurs, and isophorone diisocyanate quickly reacts with moisture, air, etc. to fill the damaged area. However, the resin film has excellent elasticity but is weak in strength, so external force is applied to the film. The disadvantage is that it can be easily damaged by . To solve this problem, it is desirable to further include Stuckey fiber material powder when encapsulating the self-healing agent. That is, the self-healing agent is manufactured by encapsulating the isophorone diisocyanate and Stuckey fiber powder with polyurethane.

The Stuki fiber powder is manufactured from Stuki, a plant. The Stuki is rich in fiber and has a high viscosity, so it can be encapsulated with isophorone diisocyanate. When forming a resin film after decomposition, the strength of the resin film and Significantly improves adhesion.

The stucco fiber powder is processed and powdered into fine fibers with a length of 400 to 1,000 ㎛ and a diameter of 20 to 40 ㎛ from the aerial part of the stucky plant. More specifically, the aerial part of the stucky plant is collected and foreign substances are removed. It is manufactured by crushing it to 0.1 to 1 mm, putting it in an ultrasonic grinder, and sonicating it for 30 to 50 minutes at a power of 100 to 500 W. The method of ultrasonic processing using an ultrasonic pulverizer simply applies the known method of using an ultrasonic pulverizer, and a detailed description thereof will be omitted.

At this time, it is sufficient to use the isophorone diisocyanate and Stuckey fiber powder in a weight ratio of 1:0.1 to 0.2.

The filler according to the present invention contains 25 to 35% by weight of cement, 10 to 20% by weight of quartz, 1 to 5% by weight of calcium hydroxide, 0.1 to 5% by weight of silica, 5 to 10% by weight of shungite powder, and 1 to 2% by weight of pozzolan. and the remainder containing polyacrylonitrile.

The cement refers to ordinary Portland cement, and when mixed with water, it forms a gel through a hydration reaction and is used as a hardener to secure physical properties such as strength. The cement is preferably a micro cement with a fineness of 8,000 cm3/g or more and a particle size of 1 ㎛ or less making up 80% or more of the particle size distribution, but this is not limited.

The cement is preferably included in 25 to 35% by weight in the filler.

The quartz reacts with water and cement to produce a catalyst combined with Ca, and the catalyst combined with Ca promotes the creation of calcium silicate hydrate, so that modified calcium silicate hydrate crystals in the form of crystals fill the pores of the concrete, providing excellent waterproofing properties. provides. In addition, this modified calcium silicate hydrate crystal has excellent durability and provides an attractive surface.

At this time, any of crystalline quartz and silver microcrystalline quartz can be used as the quartz, and its particle size of about 100 to 325 mesh is sufficient. More preferably, calcined quartz is used, which is calcined at 800 to 1470°C. When the quartz is heated at a high temperature, it is transformed into tridymite at 850°C and then transformed into cristobalite at 1450°C. Its durability is further improved.

The quartz is preferably included in 10 to 20% by weight in the filler.

The calcium hydroxide plays a role in improving waterproofing by producing insoluble calcium silicate through reaction with silica, etc.

The calcium hydroxide is preferably contained in 1 to 5% by weight in the filler.

The silica serves to improve waterproofing through reaction with calcium hydroxide.

The silica is preferably contained in 0.1 to 5% by weight in the filler.

The shungite powder is a material containing SiO ₂ (silicate) and C60 (fullerene) as main ingredients, and has the function of purifying and decomposing contaminants, as well as sterilizing and antibacterial functions, thereby increasing environmental friendliness as well as strength. It plays a role in significantly increasing . In addition, it prevents the growth of bacteria and fungi, thereby suppressing the occurrence of cracks.

The above Sungite powder can be used for elite Sungite as well as normal Sungite, and the type is not limited, and the particle size of 100 to 325 mesh is sufficient.

The shungite powder is preferably included in 5 to 10% by weight in the filler.

The pozzolan is an admixture containing silica (SiO ₂ ), and natural pozzolans such as volcanic ash, diatomaceous earth, and white clay can be used, as well as artificial pozzolans such as fly ash. Pozzolan improves workability and improves long-term strength and watertightness.

The pozzolan is preferably included in 1 to 2% by weight in the filler.

The polyacrylonitrile is intended to improve the adhesive strength between concrete and is a resinous, fibrous, and elastic material belonging to the organic polymer series made by polymerizing acrylonitrile units.

The polyacrylonitrile is included as the remainder in the filler.

In addition, the filler preferably further contains 1 to 2% by weight of partially carbonized cotton fiber and 1 to 2% by weight of duck down powder.

The partially carbonized cotton fiber is intended to enhance durability. The durability of such fillers significantly deteriorates over time, and the partially carbonized cotton fiber is used to improve this disadvantage.

The partially carbonized cotton fiber is used by carbonizing cotton fiber at a temperature of 200~500℃ for 30~180 minutes and grinding it to a particle size of 01~100㎛. When carbonized under the above conditions, only moisture and low molecular weight components in the particle are removed. This is removed, and only the high molecular weight, high physical properties components remain condensed into a strong structure, thereby demonstrating excellent physical properties.

The duck down powder is intended to significantly increase tensile strength, corrosion resistance and waterproofing, and it is sufficient to grind dried duck down to a particle size of about 10 to 500 nm.

In addition, the surface of the duck down powder may be coated with a coating solution containing an ester-based lubricant and a nonionic surfactant. This is to improve dispersibility, bonding power, etc., and the coating amount of the coating solution is preferably 0.5 to 1% by weight of the coating solution to 99 to 99.5% by weight of the duck down powder. However, in the present invention, the coating amount of the coating liquid is not specifically limited, and is only a preferred example. In addition, the coating solution may be composed of 40 to 50% by weight of a polyhydric alcohol ester lubricant and 50 to 60% by weight of a nonionic surfactant.

In addition, the filler may further include 1 to 5% by weight of stucky fiber powder as a fiber reinforcement. Since the Stuckey fiber powder has been previously described, further description thereof will be omitted.

Hereinafter, the present invention will be described in detail through specific examples.

(Example 1)

Contains 30% by weight of water-soluble phenoxy resin, 3% by weight of 3-glycidoxypropyltrimethoxysilane, 3% by weight of zinc chromite, 15% by weight of nanotype ceramic balls, 3% by weight of shungite powder, and the balance of water. A crack finishing material was prepared.

At this time, the nanotype ceramic ball was composed of aluminum silicate, the particle size was 50 nm, and the particle size of the shungite powder was 200 mesh.

(Example 2)

The same procedure as in Example 1 was performed, but a crack finishing material containing additional 3% by weight of a self-healing agent was prepared.

The self-healing agent was prepared as follows.

220 g of toluene 2,4-diisocyanate was completely dissolved in 1420 g of cyclohexanone by heating and stirring at 80°C for more than 1 hour. Then, while blowing nitrogen gas, 40 g of 1,4-butanediol was slowly added and reacted for 24 hours, then incubated at 100°C. The pressure was reduced and distilled for more than 5 hours to synthesize a polyurethane prepolymer. The number average molecular weight of the synthesized polyurethane prepolymer was 1200 to 1400, the weight average molecular weight was 1500 to 1800, and the polydispersity index (PDI) was 13. 290 g of the polyurethane prepolymer was completely dissolved in 400 g of chlorobenzene by heating and stirring at 70°C for more than 3 hours. After complete dissolution, 950 g of isophorone diisocyanate was added and stirred for more than 2 hours. A solution of 450 g of gum arabic dissolved in 3000 g of distilled water was added thereto, mixed uniformly, and then cooled to 50°C. In a cooled state, 310 g of 1,4-butanediol as a chain extender was slowly added and stirred for 1 hour to complete microencapsulation of the self-healing agent. Finally, it was washed with distilled water, vacuum filtered to obtain powder, and then ground to produce microcapsule powder in the range of 40 to 100㎛.

(Example 3)

The same procedure as in Example 2 was carried out, except that 95 g of the isophorone diisocyanate was replaced with Stuckey fiber powder when preparing the self-healing agent.

The stucco fiber powder was prepared by collecting the aerial parts of the stucco plant, removing foreign substances, pulverizing them to 1 mm, putting them in an ultrasonic grinder, and sonicating them for 40 minutes at a power of 300 W.

(Test Example 1)

The compositions of Examples 1 to 3 were tested for adhesion strength, tensile strength, topcoat compatibility, elongation, and alkali resistance according to the test methods below, and the results are shown in Table 1 below. At this time, the self-healing power was calculated by inflicting scratch damage of 1 cm in length on the coating specimen, exposing the sample to a temperature of 30°C for 24 hours, measuring the recovered length, and calculating it according to the formula.

Test Example 1 Results Test Items Example 1 Example 2 Example 3 standard Test Methods Adhesion strength
(N/㎠) 165 163 165 49 or more KS M 6010 tensile strength
(N/㎠) 150 153 152 49 or more KS F 3211 Phase compatibility clear clear clear clear KS M 6010 elongation rate
(%) 280 284 281 100 or more KS F 3211 Alkali resistance clear clear clear clear KS M 6010 self-healing power
(%) 12.5 52.1 53.2 - (W0 - W1)/W0 × 100
{W0: Length of initial scratch,
W1: Length of scratch after 24 hours} solar radiation
reflectivity(%) 80 83 82 - KS L 2514:2011

As can be seen in Table 1, Examples 1 to 3 according to the present invention were confirmed to be excellent in adhesion strength, tensile strength, topcoat compatibility, elongation, alkali resistance, and general reflectance. In addition, it was confirmed that Examples 2 and 3 had excellent self-healing ability.

As described above, a person skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features. Therefore, all embodiments described above should be understood as illustrative and not restrictive. The scope of the present invention should be construed as including all changes or modified forms derived from the meaning and scope of the claims described below and their equivalent concepts rather than the detailed description above.

Claims (7)

Checking cracks in the concrete structure and removing foreign substances;
V-cutting or U-cutting the cracked area from which the foreign matter has been removed;
Filling the cut area with filler;
It includes filling the crack finishing material in the crack area from which the foreign matter has been removed or the area filled with the filler material, and preparing the surface,
The filler is 25-35% by weight of cement, 10-20% by weight of quartz, 1-5% by weight of calcium hydroxide, 0.1-5% by weight of silica, 5-10% by weight of shungite powder, 1-2% by weight of pozzolan, and partially carbonized cotton fiber. Contains 1 to 2% by weight, 1 to 2% by weight of duck down powder, and the balance of polyacrylonitrile,
The crack finishing material is 10 to 40% by weight of water-soluble phenoxy resin, 1 to 5% by weight of silane coupling agent, 1 to 5% by weight of zinc chromite, 10 to 20% by weight of nanotype ceramic balls, and 1 to 5% by weight of shungite powder. % and the balance of solvent,
The crack finishing material further contains 1 to 5% by weight of a self-healing agent,
The self-healing agent is a waterproofing method including crack repair of concrete structures, characterized in that it is manufactured by encapsulating isophorone diisocyanate and Stuckey fiber powder with polyurethane.
delete delete delete delete According to paragraph 1,
A waterproofing method including crack repair of a concrete structure, wherein the filler further contains 1 to 5% by weight of stucky fiber powder.
According to claim 1 or 6,
After filling the crack finishing material in the area from which the foreign matter was removed and cleaning the surface,
A waterproofing method including crack repair of a concrete structure, further comprising the step of applying a primer to the surface of the structure and applying the crack finishing material to form a surface waterproofing layer.