KR100688468B1 - Waterproofing, crack repairing method of concrete structure and apparatus used therefor - Google Patents

Abstract

The present invention relates to a waterproof and crack repair method for a concrete structure, comprising the steps of: a) forming a plurality of crack diffusion prevention holes radially at equal intervals with a predetermined distance around both ends of the crack; b) injecting crack resistant reinforcement into the crack diffusion prevention hole; c) applying and drying a primer around the crack diffusion barrier and around the crack; d) injecting adhesive into the crack; e) forming a coating waterproof layer on a part including the crack and the crack diffusion prevention hole; f) laminating and curing a non-woven fabric of a predetermined size impregnated with an adhesive on a portion including the crack and the crack diffusion prevention hole; g) laminating and curing the coating film elastic waterproof material-impregnated nonwoven fabric having a width to accommodate the laminated nonwoven fabric one or more times; It is characterized by. The waterproofing and crack repair method of the concrete structure according to the present invention can prevent the cracks from expanding by inhibiting the spread of the cracks, and maintain the rigidity of the concrete structure due to the increase in the adhesion between the crack-resistant reinforcement and the crack prevention sheet. There are advantages to it.

Description

Method for waterproofing and repairing crack of concrete structure and using device

1 is a plan view of a conventional crack prevention and waterproofing method

Figure 2 is an example of adoption of the crack diffusion prevention ball according to the invention

Figure 3 is an exploded perspective view of the crack prevention and waterproofing method according to the present invention

Figure 4 is a cross-sectional view of the repaired part according to the waterproof and crack repair method according to the present invention

5 is a perspective view of the waterproof and crack repair method according to the present invention

6 is a perspective view of a waterproof and crack repair apparatus used in the present invention;

7 is a perspective view showing an example of use of the device of FIG. 6 of the present invention;

8 is a perspective view showing another example of use of the apparatus of FIG. 6 in the present invention;

9 is a cross-sectional view of the device of FIG. 6 in the present invention.

10 is a perspective view of another waterproof and crack repair apparatus used in the present invention.

FIG. 11 is a sectional view of an example of use of the apparatus of FIG. 10; FIG.

[Description of Code for Major Parts of Drawing]

1-Crack diffusion prevention work 2-Crack resistant reinforcement

3-Adhesive Impregnated Nonwovens 4, 5, 6-Coating Elastic Waterproofing Impregnated Nonwovens

100-Waterproofing and crack repairing device 101-Nonwoven feed roller

102-Glue Receptacle 103-Glue Opening Valve

104-opening and closing means 105-handle

106-1st Adhesive Spray Nozzle 107-2nd Adhesive Spray Nozzle

108-Adhesive Coating Roller 109-Pressing Roller

110-Frame 111-Vehicle

112-Nonwoven Guide 113-Elastic Springs

114-Spring elastic member 201-Nonwoven feed roller

202-Glue Receptacle 203-Glue Receptacle Cover

204-Crimp Roller 205-Frame

206-Vehicle 207-Handles

208-Nonwoven Guide 209-Elastic Springs

The present invention relates to a waterproofing and crack repair method of a concrete structure, the waterproofing and crack repair method of a concrete structure can prevent the cracks from expanding by inhibiting the spread of the cracks, the adhesion of the crack-resistant reinforcement and the crack prevention sheet The present invention relates to a method of maintaining the rigidity of a concrete structure due to the increase. The present invention also relates to a device used for waterproofing and crack repair of structures.

The cracks in concrete structures are structural cracks due to poor performance due to poor construction, physical damage, corrosion of steel bars and impacts, and plastic shrinkage and sinking cracks, dry shrinkage cracks, and freeze melting cracks. There is a nonstructural crack, such as cracks of concrete structures, such as structural defects, poor durability, damage to the appearance, poor waterproof performance, and cracks are continuously spread because In the event of a crack, appropriate measures should be taken as soon as possible.

Looking at the repair method of cracks in concrete structures, if the cracks are fine (about 0.2mm), the coating film is formed by applying coating elastic waterproofing material, polymer cement paste, filler, etc. on the cracks to improve the waterproofness and durability. Although it is expected, this is not easy to handle the cracked internal processing, it is difficult to track the crack movement from the outside when the crack is spread, and in the case of the injector grouting method (Ejecty Grouting) high-level EPOXY resin cracks in the concrete structure There is a method for crack repair, reinforcement, and waterproofing of the structure by injecting it into the resin, but epoxy is weak in heat and ultraviolet rays, and since there is little tensile and elasticity, cracking occurs in the filled epoxy resin when an external force is applied.

In addition, when the crack is relatively large, the concrete is cut into a U-shaped or V-shaped shape with a width of about 10 mm along the crack, and filled with a repair material such as a sealing agent, a plastic epoxy resin, and a polymer cement mortar. Although the repairing method is used, such repair materials are not very strong against external forces and tensile forces generated, and the physical properties of the structures are poor, or the adhesive strength with the structures is low, and cracks are generated in the repaired parts. Crack had a problem going on.

That is, if a crack occurs once, even if the adhesive is applied to the crack site or reinforced by an adhesive sheet from the outside, a stress in a predetermined direction continues to act at the end of the crack, so that a minute crack in the predetermined direction from the end of the crack occurs. Continued diffusion, there is a problem that the fine cracks are expanded to large cracks again.

Meanwhile, as shown in FIG. 1, in Korean Patent Publication No. 508729, a groove is formed along a crack and a horizontal groove is formed in a vertical direction of the traveling direction, and the primer is cleaned by drying the groove, the horizontal groove, and the periphery, and dried. Filling and drying the adhesive waterproofing agent in the groove and the horizontal groove, attach a non-woven fabric having a high tensile strength along the crack, impregnating the adhesive waterproofing agent, and curing to fix the nonwoven fabric, and then repeatedly applied and dried adhesive waterproofing agent Although a method for repairing cracks in a structure is known, the known method is characterized by having a horizontal groove to prevent crack spreading, but the horizontal groove also has a problem that the action of stress in one direction cannot be avoided. .

Therefore, the present invention was devised to solve the above problems, and an object of the present invention is to adopt a crack diffusion prevention hole to prevent the crack from spreading in one direction due to the stress acting in one direction at the end of the crack. It is to provide a waterproofing and crack repair method of the concrete structure, another object is to overcome the problem of adhesion between the concrete and the reinforcement sheet using the adhesion of the crack-resistant reinforcement and the reinforcement sheet filled in the crack diffusion prevention hole Therefore, to provide a waterproof and crack repair method of the concrete structure with improved reinforcement of the sheet.

In addition, another object of the present invention is to provide a waterproof and crack repair device that can be conveniently bonded when adhering the reinforcing sheet.

The present invention relates to a waterproof and crack repair method for a concrete structure, comprising the steps of: a) forming a plurality of crack diffusion prevention holes radially at equal intervals with a predetermined distance around both ends of the crack; b) injecting crack resistant reinforcement into the crack diffusion prevention hole; c) applying and drying a primer around the crack diffusion barrier and around the crack; d) injecting adhesive into the crack; e) forming a coating waterproof layer on a part including the crack and the crack diffusion prevention hole; f) laminating and curing a non-woven fabric of a predetermined size impregnated with an adhesive on a portion including the crack and the crack diffusion prevention hole; g) laminating and curing the coating film elastic waterproof material-impregnated nonwoven fabric having a width to accommodate the laminated nonwoven fabric one or more times; It is characterized by.

Referring to the drawings, Figure 2 shows an example of employing the crack diffusion prevention hole according to the present invention. Figure 3 is an exploded perspective view of the crack prevention and waterproofing method according to the present invention, Figure 4 shows a cross-sectional view of the repaired part according to the waterproofing and crack repair method according to the present invention. 5 is a view showing the construction of the entire waterproof, such as concrete structures by the waterproof and crack repair method according to the present invention.

As shown in Figure 2, the present invention forms a crack diffusion prevention hole (1) at both ends of the crack, the crack diffusion prevention hole (1) is radially dispersed the stress acting in a predetermined direction at the end of the crack and stress The dispersed crack diffusion prevention hole (1) induces the diffusion of the crack, the crack diffusion prevention hole (1) has the effect of preventing the spread of the crack by dispersing the stress causing the crack diffusion at 360 ° In particular, the end of the induced crack is brought into contact with the elastically imparted crack reinforcement (2, shown in FIG. 3) formed in the crack diffusion prevention hole (1), thereby preventing further crack diffusion.

Although the size of the crack diffusion prevention hole 1 varies depending on the size of the crack or the concrete structure, the diameter is preferably 3 to 10 mm, and the depth is not particularly limited because it depends on the thickness or characteristics of the concrete structure. mm is appropriate and the inner surface of the crack diffusion barrier is to be as smooth as possible so that the stress does not act in one direction.

Crack-resistant reinforcing material (2) to be filled in the crack diffusion prevention hole (1) in step b) is possible if it has high strength adhesiveness and elasticity with the cement structure, in particular 30 to 60 parts by weight of silica sand per 100 parts by weight of cement, amorphous silicate It is preferably 5 to 20 parts by weight, 20 to 50 parts by weight of an acrylic emulsion, 2 to 5 parts by weight of silicon oxide and 2 to 8 parts by weight of hydrophilic polyvinyl alcohol (PVA) fiber chips. Cement and silica sand serve as a crack diffusion prevention hole, and amorphous silicate, acrylic emulsion, silicon oxide, and hydrophilic PVA fiber chips provide elasticity to buffer stresses that cause crack diffusion. If the amount of the acrylic emulsion is less than 20 parts by weight or more than 50 parts by weight, there is a problem of miscibility with cement, and if the amount of the PVA fiber chip exceeds 8 parts by weight, there is a problem in adhesion.

Meanwhile, in forming the crack resistant reinforcing material 2 into the crack diffusion preventing hole 1, as shown in FIG. 4, the crack resistant reinforcing material 2 is formed higher than the surface of the concrete structure. Increasing the adhesion between the impregnated cement and the cement in the step of laminating and curing a non-woven fabric 3 of a predetermined size impregnated with an adhesive as a crack reinforcement material 2 and a crack prevention sheet on a site including the crack and crack diffusion prevention hole. By maintaining the rigidity of the concrete structure to prevent cracking and waterproofing.

After b) the step of injecting the crack-resistant reinforcing material (2) into the crack diffusion prevention hole (1) is completed, c) applying and drying the primer around the crack diffusion prevention hole (1) and around the crack.

Primer application and drying process is applied to the surrounding surface including cracks and crack diffusion prevention hole (1) area, and the primer reinforces the adhesive strength between concrete and impregnated nonwoven fabric to be constructed later, All are available.

After the primer coating and drying step d) injecting the adhesive to the cracks, the adhesive uses a waterproof adhesive, and the waterproof adhesive includes a mortar adhesive, a PVA emulsion adhesive, and the like.

Mortar adhesive is made by combining PVA polymer emulsion and acrylic polymer emulsion with additives. It has strong adhesiveness and waterproofness, improves mortar's water retention, and has little dry shrinkage, and PVA emulsion adhesive is adhesive. It is excellent in cold resistance, heat resistance, and excellent in workability. However, those skilled in the art can appropriately select and use, so detailed description thereof will be omitted.

d) After completing the step of injecting the adhesive to the cracked area e) through the step of forming a film waterproofing layer on the site containing the crack and crack diffusion prevention hole (1) and the coating film waterproofing layer constructed in step e) is acrylic 90 to 95% by weight of the resin binder is preferably mixed with 1 to 5% by weight ethylene vinyl alcohol (EVA), 1 to 5% by weight inorganic filler. In this case, the inorganic filler may be used without limitation as long as it is conventionally used, for example, aluminum hydroxide, titanium dioxide and the like. The ethylene vinyl alcohol is preferably used 1 to 5% by weight, the use of less than 1% by weight of the effect is insignificant, when it exceeds 5% by weight is not good because the water resistance is weak. In addition, the inorganic filler is preferably used 1 to 5% by weight, when used in less than 1% by weight the effect is insignificant, when more than 5% by weight is poor adhesion.

e) After completing the step of forming a waterproof film layer on the part containing the crack and crack diffusion prevention hole (1) f) a predetermined impregnated adhesive in the part containing the crack and crack diffusion prevention hole (1) The nonwoven fabric 3 of size is laminated and cured.

The nonwoven fabric is a method of needle punching the short fibers of polyester synthetic fibers, and impregnates the nonwoven fabric with the same or similar adhesive as the adhesive used in step d). After laminating on the coated area, it dries and hardens to maintain the rigidity of the concrete by using properties such as high tensile strength, thickness restoring force and bending force of the nonwoven fabric.

After laminating the adhesive impregnated nonwoven fabric 3 on the primer layer, g) laminating and curing the coating film elastic waterproof material impregnated nonwoven fabrics 4 and 5 having a width to accommodate the laminated nonwoven fabric is repeated one or more times. The coating film elastic waterproof material impregnated nonwoven fabric is impregnated with a nonwoven fabric in a composition containing 2-5 parts by weight of at least one selected from styrene-butadiene-styrene (SBS) rubber and butyl rubber and 0.5-1.0 parts by weight of a plasticizer per 100 parts by weight of the acrylic resin binder. By using a dry one after the drying and serves to strengthen the concrete stiffness with the adhesive-containing non-woven fabric already laminated with a waterproof effect. The styrene-butadiene-styrene (SBS) rubber and / or butyl rubber is preferable because it is excellent in impact resistance when using 2 to 5 parts by weight, the plasticizer may be used without limitation as long as it is commonly used in the art. For example, a phthalic acid ester, a trimellitic acid ester, an epoxy, or a polyester plasticizer may be used, but is not limited thereto. It is preferable to use the content in the range of 0.5 to 1.0 parts by weight, and when it exceeds 1.0 parts by weight, the adhesion becomes poor. Preferably, the coating film elastic waterproof material-impregnated nonwoven fabric is constructed in a plurality of layers, and in this case, it is preferable to construct the coating film to be laminated to a wider portion than the laminated nonwoven fabric as shown in FIG. 4 to maintain adhesive strength to concrete. Do.

The present invention, as shown in Figure 5, to prevent the cracking by laminating the coating film elastic waterproof material impregnated nonwoven fabric in multiple layers on the cracked portion, using the apparatus 100 exemplified in the present invention as a whole film elastic waterproof material impregnated nonwoven fabric ( 6) can be attached to have a waterproof effect. That is, when partial crack repair and waterproofing are required, as described above, after forming the crack diffusion prevention hole in the cracked portion, it is also possible to repair by laminating the coating elastic elastic material-impregnated nonwoven fabric only at the cracked portion, and once again as a whole. It is also possible to have a waterproof effect by lamination.

The following provides an apparatus 100 for attaching a non-woven fabric impregnated with an adhesive to the ground in the waterproof and crack repair method of the concrete structure of the present invention. The apparatus according to the present invention is disclosed in FIGS. 6 to 11, wherein FIG. 6 is a perspective view of a waterproof and crack repair apparatus used in the present invention, and FIG. 7 is a perspective view showing an example of use of the apparatus of FIG. 6 of the present invention. 8 is a perspective view showing another example of use of the apparatus of FIG. 6 in the present invention, and FIG. 9 is a sectional view of the apparatus of FIG. 6 in the present invention. 10 is a perspective view of another waterproofing and crack repair apparatus used in the present invention, and FIG. 11 is a cross-sectional view showing an example of use of the apparatus of FIG.

One aspect of the apparatus used in the present invention is shown in Figures 6 to 9,

Nonwoven fabric winding roller 101;

An adhesive container (102) for receiving an adhesive applied to the nonwoven fabric supplied from the nonwoven fabric supply roller (101);

An adhesive opening / closing valve (103) positioned inside the adhesive container (102) for controlling the flow of the adhesive;

A handle 105 connected to the adhesive opening / closing valve 103 and having opening / closing means 104 for controlling an injection amount of adhesive to a nozzle;

First and second adhesive jet nozzles 106 and 107 for injecting an adhesive onto upper and lower surfaces of the nonwoven fabric from the adhesive container 102;

A pair of adhesive applying rollers 108 for uniformly applying the adhesive sprayed from the first adhesive spray nozzle 106 and the second adhesive spray nozzle 107 to the supplied nonwoven fabric;

A pressing roller 109 for pressing the nonwoven fabric supplied from the adhesive applying roller 108 onto the ground;

Frame 110 for fixing the nonwoven fabric supply roller 101, the adhesive receiving container 102, the handle 105, the adhesive coating roller 108, the pressing roller 109; And

Moving means (111) provided at a lower portion of the frame (110) to move the frame;

It is a device for waterproofing and crack repair of a concrete structure, characterized in that it comprises a.

In the present invention, the device may further include a non-woven fabric guide 112 for guiding the non-woven fabric coated with the adhesive to the ground via the adhesive coating roller 108 as necessary. In addition, the elastic roller 113 is provided between the pressing roller 109 and the nonwoven fabric guide 112 to withstand the irregularities of the ground. In addition, the present invention preferably further comprises a spring elastic member 114 to close automatically by the elasticity of the spring when the adhesive on-off valve 103 is returned to its original state in the closed state, the compression roller 109 Is preferably rotated in the vertical direction to facilitate movement of the device.

Figure 6 shows a device for spraying the adhesive in the nozzle method in the apparatus according to the present invention, as shown in Figure 6, the method of applying the adhesive to the nonwoven fabric is the opening and closing means 104 provided in the handle 105 By using the opening and closing means 104 is connected to the adhesive container (102). Adhesive is sprayed from the adhesive jet nozzle 106 by the opening and closing means 104 from the adhesive container 102, the sprayed adhesive is evenly applied to the nonwoven fabric by the adhesive coating roller 108. The nonwoven fabric to which the adhesive is applied is moved to the pressing roller 109 along the guide roller 112 and pressed onto the ground. At this time, it is preferable to have an elastic spring 113 in the frame 110 for supporting the pressing roller to withstand the unevenness of the ground.

As shown in FIG. 7, the first adhesive spray nozzle 106 and the second adhesive spray nozzle 107 are evenly applied to the surface of the nonwoven fabric by a pair of adhesive applying rollers 108. In addition, the moving means 111, as shown in Figure 7, it is preferable to enable the left and right width adjustment.

In addition, as shown in Figure 8, the handle 105 is rotatable, it is preferable to be able to move freely in the forward direction or the reverse direction of the device, and also to facilitate the movement of the pressing roller ( 109 may be movable in the vertical direction from the ground.

In addition, as shown in Figure 9, the method for applying the adhesive to the non-woven fabric, the adhesive opening and closing valve 103 provided in the interior of the adhesive container 102 is connected to the opening and closing means 104, the opening and closing means 104 When pulled by hand, the on-off valve 103 is raised as shown in Figure 9, the adhesive is released, the on-off valve 103 is provided with a spring elastic member 114 as necessary by the elastic force It is desirable to close automatically.

Another aspect of the apparatus of the present invention is as shown in FIGS. 10 and 11,

A nonwoven fabric winding roller 201 wound around a nonwoven fabric;

An adhesive container 202 for receiving an adhesive applied to the nonwoven fabric supplied from the nonwoven fabric supply roller 201;

An adhesive accommodating portion cover 203 for scraping the adhesive impregnated in excess on the surface of the nonwoven fabric at the outlet of the adhesive accommodating container 202 so that the adhesive is applied in a predetermined amount;

A pressing roller 204 for pressing the nonwoven fabric supplied through the adhesive container 202 onto the ground;

A frame 205 for fixing the nonwoven fabric supply roller 201, the adhesive container 202, and the compression roller 204;

Moving means (206) provided below the frame (205) to move the frame; And

A handle 207 for adjusting the traveling direction of the moving means 206

Apparatus for waterproofing and crack repair of the concrete structure, characterized in that having a.

In this case, the present invention may further include a nonwoven fabric guide 208 for guiding the nonwoven fabric coated with the adhesive via the adhesive container 202 to the ground, if necessary, and the pressing roller 204 and the nonwoven fabric guide. An elastic spring 209 is provided between 208 to withstand the unevenness of the ground.

10 illustrates an adhesive impregnation apparatus, and as shown, the nonwoven fabric supplied from the nonwoven fabric supply roller 201 enters the adhesive container 202, and the adhesive container 202 as shown in FIG. 11. It is preferable that the exit of the) is provided with an adhesive accommodating cover 203 to scrape away the adhesive impregnated with the nonwoven fabric in excess. The non-woven fabric coated with the adhesive is moved to the pressing roller 204 along the nonwoven fabric guide 208 and compressed to the ground. As described above, the handle 207 is movable, and the width of the moving means 206 is adjusted. This is possible, and the elastic spring 209 is provided.

When the non-woven fabric is pressed on the ground using the device in the present invention, since the work can be easily performed in a simple manner has an advantageous effect.

Hereinafter, the following examples are described for the detailed description of the present invention, but the present invention is not limited thereto.

EXAMPLE

Concrete specimens with a compressive strength of 210 kgf / cm 2 were prepared, and after 28 days of age, the concrete surface was impacted to form cracks having a total length of 5 cm. Three crack diffusion preventing holes having a diameter of 5 mm were formed in a radially equidistant manner at a distance of 3 cm from both ends of the crack at a depth of 5 mm. In the crack diffusion prevention hole, 40 parts by weight of silica sand, 10 parts by weight of amorphous silicate, 3 parts by weight of silicon oxide, 5 parts by weight of hydrophilic PVA fiber chip, and 30 parts by weight of acrylic emulsion based on 100 parts by weight of cement (usually Portland cement). The crack reinforcement was injected to rise 1 mm above the concrete surface and then dried.

After drying, the primer was coated and dried around the crack diffusion barrier and the crack, and then mortar adhesive was injected into the crack. To the site including the crack and crack diffusion prevention hole 95% by weight of acrylic resin binder, 3% by weight of ethylene vinyl alcohol (EVA), a coating film waterproof layer mixed with titanium dioxide 2% by weight of an inorganic filler was applied using a roller. After drying, the polyester nonwoven fabric impregnated with the mortar adhesive was laminated and cured. Then, the coating non-woven fabric was coated and cured three times. The nonwoven fabric was repeatedly laminated and cured three times. The nonwoven fabric was laminated and cured.

At this time, the coating film elastic waterproofing material was used by mixing 3 parts by weight of styrene-butadiene-styrene rubber and 0.6 parts by weight of a plasticizer (dioctylphthalate based on phthalic acid ester) per 100 parts by weight of acrylic resin.

After 3 months of construction, the presence of cracks and the lifting of the waterproofing layer were visually observed. However, even if the rainfall of more than 250mm per day during the rainy season, no leakage occurred, and cracks no longer occur after 1 year. And no lifting of the waterproof layer occurred.

In addition, in order to measure the adhesion between the film-coated elastic waterproof material impregnated nonwoven fabric and the concrete surface, 4cm × 4cm iron piece is completely attached to the concrete surface with an adhesive, and then cut with a grinder 1cm deep along the edge of the iron piece to draw the iron piece by the corresponding area. It could be. After connecting the drawing tester and the iron piece, pressurized by hydraulic pressure to draw the iron piece and measuring the bond strength, the average value of the pulling load, which is the force for drawing the iron piece by hydraulic pressure, was 291kgf / ㎠, The average value of the adhesion stress, divided by, was 17 kgf / cm 2. In addition, it was found that the base metal was destroyed and dropped while the coating elastic waterproof material adhered to the concrete surface, and it was found that the coating elastic elastic material impregnated nonwoven fabric had excellent adhesion from the detachment.

The waterproof and crack repair method of the concrete structure according to the present invention can prevent cracks from spreading by providing a crack diffusion prevention hole, and can maintain the rigidity of the concrete structure due to an increase in adhesion between the crack resistant sheet and the crack prevention sheet. There is an advantage.

In addition, by using the device according to the invention there is an effect that can be easier, easier construction.

Claims (8)

a) forming a plurality of crack diffusion prevention holes radially at equal intervals at a predetermined distance with respect to both ends of the crack; b) 30 to 60 parts by weight of silica sand per 100 parts by weight of cement, 5 to 20 parts by weight of amorphous silicate, 2 to 5 parts by weight of silicon oxide, 2 to 8 parts by weight of hydrophilic PVA fiber chip, and acrylic emulsion 20 to Injecting 50 parts by weight of crack resistant reinforcement; c) applying and drying a primer around the crack diffusion barrier and around the crack; d) injecting adhesive into the crack; e) forming a coating waterproof layer on a part including the crack and the crack diffusion prevention hole; f) laminating and curing a non-woven fabric of a predetermined size impregnated with an adhesive on a portion including the crack and the crack diffusion prevention hole; g) laminating and curing the coating film elastic waterproof material-impregnated nonwoven fabric having a width to accommodate the laminated nonwoven fabric one or more times; Waterproofing and crack repair method of a concrete structure, characterized in that. The method of claim 1, The crack diffusion prevention hole is waterproof and crack repair method of a concrete structure, characterized in that the diameter of 3 ~ 10mm. delete The method of claim 1, Waterproofing and crack repair of the concrete structure, characterized in that the coating film waterproof layer in step e) is mixed with 1 ~ 5% by weight of ethylene vinyl alcohol (EVA), 1 ~ 5% by weight of an inorganic filler in acrylic resin binder 90 to 95% by weight Way. The method of claim 1, In step g), the coating film elastic waterproofing material is impregnated with a nonwoven fabric in a composition containing 2 to 5 parts by weight of a styrene-butadiene-styrene rubber and 2 to 5 parts by weight of a plasticizer and a plasticizer per 100 parts by weight of an acrylic resin. Waterproofing and crack repair method of a concrete structure, characterized in that. delete delete delete

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