WO2021177541A1 - Method for repair and reinforcement of concrete structure using three-dimensional fibers - Google Patents

Abstract

The present invention relates to a method for repairing and reinforcing a concrete structure using three-dimensional fibers and, more specifically, to a method for repairing and reinforcing a concrete structure using three-dimensional fibers, wherein the concrete structure is repaired by using three-dimensional fibers formed in a three-dimensional structure, and the repair and reinforcement of the concrete structure are achieved by directly attaching the three-dimensional fibers to the concrete structure without a separate reinforcing material, by impregnating the three-dimensional fibers with a filler.

Description

Repair and reinforcement of concrete structures using three-dimensional fibers

The present invention relates to a method of repairing and reinforcing a concrete structure using three-dimensional fibers, and more particularly, repairing a concrete structure using three-dimensional fibers formed in a three-dimensional structure, but impregnating the three-dimensional fibers with a filler to make a concrete structure without a separate reinforcing material It relates to a method of repairing and reinforcing concrete structures using three-dimensional fibers that allows repair and reinforcement of concrete structures by directly attaching three-dimensional fibers to them.

In the civil engineering and construction fields, various concrete structures undergo deterioration phenomena such as neutralization, freeze damage, and salt damage due to complex effects such as environmental factors and deterioration of durability of materials used. There is a demand for an appropriate repair and reinforcement method for cross-section restoration of deteriorated concrete for maintenance and improvement of durability.

For example, if the crack width of a concrete structure exceeds 0.2 mm, a method of filling or injecting repair materials such as epoxy resin mortar and polymer cement mortar into the cracked part is adopted. It can be classified into a method of cutting into a mold and filling the part with repair material, and a method of injecting repair material into the cracks by using a special device. As prior art related thereto, there are Patent Documents 1 and 2, and the like.

In KR 100846159 B1 (Patent Document 1), 39.58-42.12 parts by weight of cement, 41.60-45.12 parts by weight of silica sand, 13.52-14.39 parts by weight of a water-soluble polymer, and 1.78-1.89 parts by weight of silica fume are thoroughly stirred and mixed. Thus, the strength of expression and the structure and pore structure of the hardened cement were improved to improve water tightness and resistance to neutralization, frost damage, and salt damage, and to have the effect of suppressing microcracks.

In addition, in KR 100597176 B1 (Patent Document 2), surface microcracks such as reticulated cracks are generated on the surface of a concrete structure subject to severe vibration or expansion and contraction change, and the repair and reinforcement method for a structure in which the overall concrete surface condition is deteriorated due to continued expansion The steps of removing foreign substances by using a high-pressure washer or the like in the part that needs repair; and cutting the cracked part in the progress direction of the generated crack so that the cross section of the cut part has a substantially triangular shape to form a filling groove (2) Step; and 48 to 55% by weight of acrylic emulsion, 13 to 22% by weight of titanium dioxide (TiO2), 18 to 25% by weight of calcium carbonate (CaCo3), 3 to 7% by weight of silica pigment and water in the filling groove (2) Forming an elastic filler layer by filling an elastic filler including the remainder; And 20% by weight of polyurethane blocked with isocyanate on the elastic filler layer, 30% by weight of amorphous silicon dioxide, 20% by weight of calcium carbonate, and trimethylene hexamethy A method of repairing and reinforcing a concrete surface elastic waterproofing coating comprising the step of forming an elastic surface protection reinforcing layer by applying an elastic surface protection waterproof coating agent containing 10% by weight of rendiamine and 20% by weight of an alkylsulfonic acid ester of phenol is described about.

However, concrete that has been repaired and reinforced by the construction method of Patent Document 1 and Patent Document 2 has a low adhesion performance to a deteriorated concrete structure, so that scouring and aggregate separation occur, or pop-out ( Pop-out) may occur, and the resistance to cracking progress of deteriorated concrete was low, so cracks occurred on the surface of the repair mortar and resin coating, which had the disadvantage of having to proceed with the repair work.

The present invention has been devised to solve the various problems as described above, and the purpose of the present invention is to enable repair and reinforcement through a construction method of directly attaching three-dimensional fibers to a concrete structure, thereby reinforcing panels used in conventional repair and reinforcement construction methods. and to provide a method of repairing and reinforcing a concrete structure so that repair and reinforcement of the concrete structure can be conveniently performed without a reinforcing material.

In addition, another object of the present invention is to improve the tensile strength, compressive strength, and flexural strength of the three-dimensional fiber by impregnating the three-dimensional fiber with a filler, thereby increasing the durability of the concrete structure to prevent damage to the structure due to external impact, etc. To provide a method of repairing and reinforcing concrete structures using

In addition, another object of the present invention is to improve the adhesion strength between the three-dimensional fibers and concrete by impregnating the three-dimensional fibers with a filler to prevent scouring, aggregate separation and pop-out, and to maintain the adhesion for a long time. An object of the present invention is to provide a method for repairing and reinforcing concrete structures using three-dimensional fibers.

In order to solve the above object, the method of repairing and reinforcing a concrete structure using three-dimensional fibers of the present invention includes a surface treatment step (S10) of washing the concrete structure to be reinforced; Reinforcing agent application step (S20) of applying a reinforcing agent to the concrete structure after the surface treatment step (S10); The first filler application step (S30) of applying the filler to the concrete structure after the reinforcing agent application step (S20); A three-dimensional fiber attachment step (S40) of attaching the three-dimensional fiber 100 to the concrete structure after the first filler application step (S30); A coating material application step of applying a coating material to the three-dimensional fiber after the three-dimensional fiber attachment step (S40) (S60); and a curing step (S70) for curing and hardening after the coating material application step (S60), wherein the three-dimensional fiber 100 attached in the three-dimensional fiber attachment step is a surface layer 110 and a back layer 130 and an intermediate layer 120 in a three-dimensional shape, wherein the surface layer 110 and the back layer 130 are formed in a lattice shape, and the lattice spacing of the surface layer 110 is 1 5 mm, the lattice spacing of the back layer 130 is 0.1 to 3 mm, and the intermediate layer 120 is formed between the surface layer 110 and the back layer 130 to a height of 1 to 10 mm. The surface layer 110 and the back layer 130 are sequentially and continuously connected to each other and are formed by zigzag fibers, and the inside of the three-dimensional fiber 100 is filled in a slurry state prepared by mixing a binder with a filler. It was characterized in that the slurry was impregnated with a spray gun.

In addition, between the three-dimensional fiber attachment step (S40) and the coating material application step (S60), it characterized in that it further comprises a secondary filler application step (S50) of applying a filler to the three-dimensional fiber.

In addition, the filler used in the first filler application step (S30) and the secondary filler application step (S50) was prepared by mixing 28 to 32 parts by weight of binding water with respect to 100 parts by weight of the filler.

In addition, in the three-dimensional fiber attaching step (S40), a filler impregnating step of impregnating the three-dimensional fiber to be attached with a filler is further included, wherein the three-dimensional fiber impregnated with the filler in the filler impregnating step is applied to the concrete structure to which the primary filler is applied. It was characterized by being attached.

In addition, the three-dimensional fiber attachment step (S40) characterized in that it further comprises a helical bar insertion step of inserting the helical bar into the three-dimensional fiber.

In addition, the filler is usually 60 to 75% by weight of Portland cement, 15 to 25% by weight of fine blast furnace slag powder, 3 to 7% by weight of calcium sulfaluminate, 3 to 7% by weight of silica fume, 0.2 to 1.0 of a thickener Weight %, antifoaming agent 0.1 to 0.2 weight %, bentonite 1.0 to 5.0 weight % and any one of acrylic resin, EVA resin, and SBR resin 1.0 to 5.0 weight %, melamine-based, naphthalene-based, polycarboxylate-based high performance Any one of the fluidizing agent was characterized in that it contains 0.5 to 3.0% by weight.

According to the method of repairing and reinforcing concrete structures using three-dimensional fibers of the present invention, the repair and reinforcement of concrete is performed by directly attaching the three-dimensional fibers impregnated in the filler to the concrete structure without construction of a separate reinforcing material. It has a simple effect.

In addition, by adding a filler function to the three-dimensional fiber, the adhesion strength is improved to prevent scouring, aggregate separation, and pop-out, and concrete structures generated by external impact due to elasticity. It has the effect of not only reducing the damage of steel, but also of having high durability against corrosion of reinforcing bars caused by snow removal agents, etc.

1 is a flowchart showing the construction steps of the method of repair and reinforcement of a concrete structure using three-dimensional fibers of the present invention;

2 is a view showing a construction state of the surface treatment step of the present invention;

3 is a view showing the construction state of the reinforcement agent application step of the present invention;

4 is a view showing a construction state of the first filler application step of the present invention;

5 is a view showing the construction state of the three-dimensional fiber attachment step of the present invention;

6 to 7 are views showing the three-dimensional fiber of the present invention;

8 is a view showing the surface layer of the three-dimensional fiber of the present invention;

9 is a view showing the back layer of the three-dimensional fiber of the present invention;

10 is a view showing the construction state of the filler impregnation step of the present invention

11 is a view showing a construction state of the coating material application step of the present invention;

12 is a cross-sectional view of a concrete structure to which the repair and reinforcement method of the present invention is constructed;

The terms or words used in the present specification and claims should not be construed as being limited to their ordinary or dictionary meanings, and the inventor may properly define the concepts of the terms to best describe his invention. Based on the principle, it should be interpreted as meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical spirit of the present invention, so various equivalents that can be substituted for them at the time of the present application It should be understood that there may be variations and examples.

Hereinafter, prior to the description with reference to the drawings, it is not shown or specifically described for the known configurations that are not necessary to reveal the gist of the present invention, that is, those skilled in the art that can be added obviously by those skilled in the art. reveal the sound

1 is a flowchart showing the construction steps of the method of repair and reinforcement of a concrete structure using three-dimensional fibers of the present invention.

As shown in Fig. 1, the repair and reinforcement method of the deteriorated concrete structure using the three-dimensional fiber of the present invention (hereinafter referred to as the repair and reinforcement method) is a surface treatment step (S10) of washing the concrete structure to be reinforced, the above After the surface treatment step (S10), the reinforcing agent application step of applying a reinforcing agent to the concrete structure (S20), the first filler application step of applying the filler to the concrete structure after the reinforcing agent application step (S20) (S30), the first filler application After the step (S30), the three-dimensional fiber attachment step (S40) of attaching the three-dimensional fiber to the concrete structure, the coating material application step of applying the coating material to the three-dimensional fiber after the three-dimensional fiber attachment step (S40) (S60) and the coating material application step (S60) ) after curing and curing, including a curing step (S70).

In addition, a secondary filler application step (S50) of applying a filler to the three-dimensional fiber may be further included between the three-dimensional fiber attachment step (S40) and the coating material application step (S60).

2 is a view showing the construction of the surface treatment step (S10) of the present invention.

The surface treatment step (S10) is to maintain the working surface of the concrete structure to be repaired and reinforced in a healthy state. This is a step to remove foreign substances.

To this end, in the surface treatment step (S10), it is preferable to wash the surface of the concrete structure using high-pressure water or the like, and to roughen the surface of the deteriorated part of the concrete to improve the adhesion.

In addition, in the surface treatment step (S10), it is preferable to organize the concrete structure to be repaired and reinforced by chipping and washing using a hammer drill or a high-pressure washer depending on the working part of the concrete structure to be repaired and reinforced.

Figure 3 is a view showing the construction of the reinforcing agent application step (S20) of the present invention.

The reinforcing agent application step (S20) is a step of applying a permeable concrete reinforcing agent to the concrete structure after the surface treatment step (S10).

In this way, by applying the permeable concrete reinforcing agent to the concrete structure, the reinforcing agent penetrates into the concrete, and the reinforcing agent chemically reacts with the material in the concrete to generate a waterproof function, and to improve durability and abrasion resistance.

4 is a view showing a construction state of the first filler application step (S30) of the present invention.

The first filler application step (S30) is a step of applying the filler to the concrete structure after the reinforcement agent application step (S20).

The first filler application step (S30) is to apply the filler to the concrete structure before attaching the three-dimensional fibers to the concrete structure, so that the three-dimensional fiber attachment step, which will be described later, is made more easily.

As the filler used in the filler application step (S30), it is preferable to use a filler in which 28 to 32 parts by weight of bonding water are mixed with respect to 100 parts by weight of the filler.

This is because, when the content of the binding water is less than 28 parts by weight, it is difficult to obtain the desired adhesiveness, and when it is more than 32 parts by weight, problems such as dripping when attaching the three-dimensional fibers occur, and workability is deteriorated.

In addition, the filler used in the filler application step (S30) is usually 60 to 75% by weight of Portland cement, 15 to 25% by weight of fine blast furnace slag powder, 3 to 7% by weight of calcium sulfa aluminate, and 3 to silica fume 7% by weight, 0.2 to 1.0% by weight of a thickener, 0.1 to 0.2% by weight of an antifoaming agent, 1.0 to 5.0% by weight of bentonite and 1.0 to 5.0% by weight of any one of acrylic resin, EVA resin, and SBR resin, melamine-based, naphthalene It contains 0.5 to 3.0 wt% of any one of the high-performance fluidizing agent of the polycarboxylate-based system.

The ordinary Portland cement is the most widely used cement, and it uses a _{clay material containing silica (SiO 2} ), aluminum (Al ₂ O ₃ ), iron oxide (Fe ₂ O ₃ ), and lime as the main component and mixes it in an appropriate ratio. It is made by adding 3~5% gypsum to the clinker obtained by calcining in a rotary kiln until a part of it is melted (about 1,450℃), and pulverizing it to a fineness of 3,200~3,400cm2/g.

In the filler of the present invention, it is preferable to use a mixture of 60 to 75% by weight of such ordinary Portland cement, which is a problem of setting and compressive strength reduction due to delay in initial strength development when the Portland cement is less than 60% by weight, When it exceeds 75% by weight, surface cracks occur due to drying shrinkage, and Na precipitates on the surface by evaporation of moisture _{after soluble components (Ca(OH) 2 , alkali, etc.) in cement are dissolved in moisture in the capillary space. 2} SO ₄ , K ₂ SO ₄ This is because there is a problem that the efflorescence phenomenon occurs due to sulfate.

The fine powder of blast furnace slag refers to a product generated in the process of manufacturing pig iron in a blast furnace at a steel mill. SiO ₂ and Al ₂ O ₃ present in the ash of the main raw material (iron ore) and auxiliary raw materials (coke, limestone) react with lime at high temperature When the molten slag generated at high temperature is rapidly cooled by spraying pressurized water, it becomes a glassy (1-5 mm granular material) porous sand shape and has latent hydraulic properties.

Although such blast furnace slag does not harden alone, it is a latent hydraulic material that is stimulated _{by Ca(OH) 2 or gypsum due to hydration of Portland cement to cause hardening.} It is known to be effective in places where resistance to erosion is high and chemical resistance is required.

In the filler of the present invention, such fine powder of blast furnace slag It is preferable to use a mixture of 15 to 25% by weight, which is that when the fine powder of blast furnace slag is less than 15% by weight, resistance to chemical erosion is small, and when it exceeds 25% by weight, long-term strength for latent hydraulic strength increases This is because there are problems in that early strength development is slow or cracks may occur due to drying shrinkage.

When the calcium sulfur aluminate is mixed with cement and water, it mainly produces ettringite or calcium hydroxide [Ca(OH) ₂ ] by hydration reaction to expand the cement mortar and promote hydration. to improve the initial strength. In addition, by creating fine needle-like ethrinzite, it fills and expands micropores to prevent shrinkage of cement mortar, and furthermore, it can prevent cracking of cement mortar and improve tensile properties.

In the filler of the present invention, such calcium sulfa aluminate It is preferable to use a mixture of 3 to 7% by weight, but when calcium sulfa aluminate is less than 3% by weight, there are problems with cracking and mold demolding due to a decrease in initial strength expression, and when it exceeds 7% by weight, rapid hydration This is because problems such as rapid hardening, deterioration of workability, and volume change due to expandability occur.

The silica fume is micro silica particles obtained by collecting and filtering SiO2 contained in waste gas generated when manufacturing silicon (Si), ferrosilicon (FeSi), silicon alloy, etc. with a dust collector, high-strength cement and concrete products, refractories, and It is a product applied in various fields such as replacement of other asbestos.

The silica fume is known as an essential material for the recent production of underwater concrete or concrete requiring durability, especially high-strength concrete. It is known to improve concrete strength through pozzolan reaction with calcium hydroxide, and has latent hydraulic properties to fill micropores of cement mortar.

In the filler of the present invention, such silica fume It is preferable to use a mixture of 3 to 7% by weight. This is because when the silica fume is less than 3% by weight, it is not possible to densify the inside of the gel pores in the cement curing and curing process, and the resistance to external chemical substances and freeze-thaw is low. This is because there is a problem of lowering durability, and when it exceeds 7% by weight, problems such as deterioration of workability due to increase in viscosity of cement mortar occur.

On the other hand, the thickener gives viscosity to the cement mortar to increase the separation resistance of each material, and when used excessively, it can decrease the initial strength expression due to delay of setting of the cement mortar and reduce productivity due to high viscosity.

Examples of the type used as the thickener include cellulosic such as methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydropropylene cellulose, hydroethyl methylene cellulose, hydropropyl methyl cellulose, hydrobentonite methyl cellulose, polyacrylamide, soda acrylate, polyethylene There are acrylic oxide, a copolymer of polyacrylamide and sodium acrylic acid, and any one of them may be used or a mixture of cellulose and acrylic acid may be used.

In addition, in order to suppress the pores inside the cement mortar caused by the polymer properties of the thickener, any one of higher alcohols, phosphate esters, silicones, dibutyl butanediol, tributyl phosphate glycol, and non-aqueous alcohols may be used as an antifoaming agent.

In the filler of the present invention, it is preferable to use a mixture of 0.2 to 1.0% by weight of such a thickener, which has a problem of reducing the effect on separation resistance of each material when the thickener is less than 0.2% by weight, and exceeding 1.0% by weight In this case, workability is reduced due to excessive viscosity increase, and there is a problem of delaying initial strength development due to delayed hydration, which is a characteristic of cellulose-based materials.

The antifoaming agent is a powdery silicone type, and it is preferable to use 0.1 to 0.2 wt% of the antifoaming agent mixed in the filler of the present invention, which is less than 0.1 wt% of the antifoaming agent. Since the amount of air cannot be effectively removed, it contains an internal air content of 35-40%, which is much higher than that of a normal cement mortar of 22-25%, so there is a problem of lowering the compressive strength. This is because problems such as reduced workability and reduced resistance to freezing and thawing in winter occur due to excessive removal of air volume.

The bentonite powder is used to prevent cracking of the surface of the cement mortar, improving water resistance, and preventing bleeding water, and it is preferable to mix and use 1.0 to 5.0 wt% of the bentonite powder in the filler of the present invention.

If the amount of bentonite powder is less than 1.0% by weight, it has no effect on improving water resistance and removing bleeding water. because this happens.

In addition, in the present invention, in order to prevent cracking due to plastic shrinkage during curing of the filler and to improve adhesion strength to deteriorated concrete, water tightness and resistance to salt damage, any one of acrylic resin, EVA resin and SBR resin is added to 1.0 to 5.0. It is preferable to use the mixture by weight %.

This causes a decrease in adhesion with a deteriorated concrete structure, a decrease in resistance to salt damage and carbonation, an increase in water permeability, etc. when any one of the above acrylic resin, EVA resin and SBR resin is less than 1.0% by weight, and increases in viscosity when it is 5.0% by weight or more This is because it causes a decrease in the filling properties of the three-dimensional fiber according to the flow rate, a decrease in workability due to a decrease in fluidity, and a decrease in the physical properties of the filler such as compressive strength and flexural strength.

In addition, in the present invention, in order to improve the fluidity of the filler, 0.5 to 3.0 parts by weight of the powdered melamine-based fluidizing agent, the naphthalene-based fluidizing agent and the polycarboxylate-based fluidizing agent are mixed with respect to 100 parts by weight of the filler. .

This is because when the powdery melamine-based fluidizing agent, naphthalene-based fluidizing agent, and polycarboxylate-based fluidizing agent is less than 0.5 parts by weight, there is a problem in improving the workability of cement mortar added to improve the viscosity of silica fume, thickener, bentonite, etc. This is because, when it exceeds 3.0 parts by weight, the separation resistance of the materials is reduced, and problems such as suppressing the occurrence of bleeding water occur.

5 is a view showing a construction state of the three-dimensional fiber attachment step (S50) of the present invention.

The three-dimensional fiber attachment step (S50) is a step of attaching the three-dimensional fibers to the concrete structure to which the filler is applied after the first filler application step (S40).

As shown in FIGS. 6 and 7 , the three-dimensional fiber 100 used in the three-dimensional fiber attachment step (S50) has a three-dimensional shape including a surface layer 110, a back surface layer 130, and an intermediate layer 120. It is constructed so that it has higher tensile strength and increased durability than when using the conventional planar fibers.

The surface layer 110 of the three-dimensional fiber 100 constitutes an attachment surface to be attached to the concrete structure, and the back layer 120 constitutes a finished surface for protecting the concrete structure.

8 is a view showing the state of the surface layer, and FIG. 9 is a view showing the state of the back layer.

8 and 9, the surface layer 110 and the back surface layer 130 are formed in a grid shape. At this time, the grid spacing of the surface layer 110 is formed at an interval of 1 to 5 mm, and the back layer 130 ) is preferably formed at an interval of 0.1 to 3 mm.

This means that if the lattice spacing of the surface layer 110 is less than 1 mm, impregnation of the filler into the inside of the surface layer is not easy. Therefore, the lattice spacing of the surface layer 110 is preferably formed at an interval of 1 to 5 mm.

In addition, if the lattice spacing of the back layer 130 is less than 0.1 mm, the coating material applied in the filler and coating material application step (S60) applied in the secondary filler application step (S50) to be described later is not easily applied to the back layer. If the lattice spacing of the back layer exceeds 3 mm, the strength of the three-dimensional fiber decreases as the lattice spacing is widened.

Accordingly, by forming the lattice spacing between the surface layer 110 and the back surface layer 130 as described above, the application of the filler and coating material is facilitated, and the strength of the three-dimensional fiber is maintained.

The intermediate layer 120 is formed with a height of 1 to 10 mm between the surface layer 110 and the back surface layer 130 to serve as a spacer between the surface layer and the back surface layer, and according to the height of the intermediate layer 120 , the three-dimensional The thickness of the fiber 100 is determined.

In addition, the intermediate layer 120 is formed by zigzag-shaped fibers formed by sequentially connecting the surface layer 110 and the back surface layer 130 as shown in FIGS. 6 and 7, and is formed by such zigzag-shaped fibers. The intermediate layer 120 , which is the interval between the surface layer 110 and the back surface layer 130 , can always maintain a spaced state at a regular interval.

A space in which the filler can be easily filled and impregnated is formed between the surface layer 110 and the back surface layer 130 by the intermediate layer 120, thereby increasing the strength of the three-dimensional fiber.

The three-dimensional fiber 100 is made of any one of nylon, polyester, acrylic fiber, PVA fiber, polypropylene fiber, polyurethane fiber, carbon fiber, glass fiber, and aramid fiber having high strength, and thus has high compressive strength and tensile strength. And it is preferable to have flexural strength.

By attaching the three-dimensional fibers 100 to the concrete structure coated with the filler, the tensile strength and durability of the concrete structure are increased, and the effect of improving resistance to salt damage and carbonation is achieved.

In addition, the step of attaching the three-dimensional fibers may further include a filler impregnation step of impregnating the three-dimensional fibers with the filler as shown in FIG. 10 .

As described above, the three-dimensional fiber 100 is formed with a thickness of 1 to 10 mm in height of the intermediate layer 120 .

At this time, when the thickness of the three-dimensional fiber 100 is formed to be less than 1 mm, the three-dimensional fiber 100 is easily attached to the concrete structure only with the filler applied to the concrete structure through the first filler application step, and the filler material when attached is easily impregnated into the three-dimensional fiber 100, so that the filler is impregnated into the three-dimensional fiber, thereby having the effect of repair and reinforcement.

However, when the thickness of the three-dimensional fiber 100 exceeds 10 mm, as the thickness of the three-dimensional fiber increases, the three-dimensional fiber is applied to the concrete structure only with the filler applied to the concrete structure in the first filler application step (S30). It may not be attached properly.

Therefore, after the three-dimensional fiber is impregnated with the filler through the filler impregnation step of directly impregnating the filler into the three-dimensional fiber 100, the three-dimensional fiber impregnated with the filler is applied to the concrete structure in the first filler application step (S30) By attaching to the filled filler, the adhesion of the three-dimensional fibers is increased, and by allowing the filler to be sufficiently impregnated into the three-dimensional fibers, the tensile strength, compressive strength, and flexural strength are improved, thereby increasing the durability of the concrete structure.

In the filler impregnation step, the filler is mixed with binding water to prepare a filled slurry in a slurry state, and then, as shown in FIG. Impregnated into three-dimensional fibers.

In addition, the three-dimensional fiber attachment step (S40) may further include a helical bar insertion step of inserting the helical bar into the three-dimensional fiber.

That is, in the three-dimensional fiber attachment step (S40), before attaching the three-dimensional fiber to the concrete structure, a helical bar is inserted into the three-dimensional fiber so that the three-dimensional fiber into which the helical bar is inserted is attached to the concrete structure.

The helical bar used in the helical bar insertion step is composed of a nickel-chromium alloy steel bar in which chromium (Cr) is added to nickel (Ni).

As described above, by adding chromium to nickel to the helical bar, the helical bar has the effect of improving oxidation resistance and corrosion resistance, and by attaching the helical bar to the concrete structure with the helical bar inserted into the three-dimensional fiber, the durability of the concrete structure is increased. will be.

On the other hand, the secondary filler application step (S50) is a step of applying a filler to the three-dimensional fiber attached to the concrete structure after the three-dimensional fiber attachment step (S50), which is selectively performed depending on the state in which the three-dimensional fiber is impregnated with the filler is a step

That is, when the three-dimensional fiber is sufficiently impregnated with the filler, the secondary filler application step (S50) is omitted, the coating material application step (S60) to be described later is performed, and when the three-dimensional fiber is not sufficiently impregnated with the filler, the secondary filler application step ( After performing S50) so that the three-dimensional fiber can be sufficiently impregnated with the filler, a coating material application step (S60), which will be described later, is performed.

The filler used in the secondary filler application step (S50) may be of the same component as the filler used in the primary filler application step (S30).

In this way, by applying the filler to the three-dimensional fiber 100, the three-dimensional fiber can be sufficiently impregnated with the filler to increase the durability of the three-dimensional fiber.

11 is a view showing a construction state of the coating material application step of the present invention.

The coating material application step (S60) is a step of applying a coating material to the surface of the attached three-dimensional fiber as shown in FIG. 11 after the three-dimensional fiber attachment step (S50).

By applying the coating material to the surface of the three-dimensional fiber attached to the concrete structure as described above, the effect of increasing the durability of the three-dimensional fiber attached and preventing corrosion is obtained.

At this time, the coating material used in the coating material application step (S60) is prepared by mixing a flame retardant containing a water-soluble acrylic resin and an inorganic composite material, and a neutralizing agent containing a water-soluble acrylic resin and an inorganic composite material.

In addition, the inorganic composite material included in the flame retardant and the neutralizing agent is manufactured to include No. 8 silica sand, cement and silica fume.

In this way, the coating material includes a flame resistant material and a neutralization prevention material to prevent deterioration of the durability of the concrete structure due to salt or the like through the coating material application step (S60), and to prevent deterioration of concrete due to corrosion of reinforcing bars is to do it

On the other hand, the curing step (S70) is a step of naturally curing the applied filler after the coating material application step (S60).

When the curing step (S70) is completed, as shown in FIG. 12 , the three-dimensional filling fiber 200, which is a three-dimensional fiber impregnated with a filler, is formed in the concrete structure to be repaired and reinforced, thereby repairing and strengthening the concrete structure using the three-dimensional fiber. This is done.

In addition, as shown in FIG. 12, the deteriorated part of the concrete structure is repaired and reinforced by the repair and reinforcing layer 300, and the filler layer 400 is formed on the surface of the repair and reinforcing layer, so that the filler layer 400 By attaching the filling three-dimensional fiber 100 to the concrete structure, the filling three-dimensional fiber 200 is formed.

Hereinafter, through Examples 1 to 3 and Comparative Examples 1 to 2, the physical properties of the filler of the present invention will be described.

Example 1.

A filler is prepared by mixing 28 parts by weight of binding water with respect to 100 parts by weight of the filler (W/B = 28%), but the filler is usually 60% by weight of Portland cement, 20% by weight of fine blast furnace slag powder, and 5% by weight of calcium sulfa aluminate %, silica fume 5% by weight, thickener 0.6% by weight, antifoaming agent 0.1% by weight, and bentonite 3% by weight were mixed to prepare a filler, and the physical properties of the prepared filler are described in Table 1 below.

Example 2.

A filler was prepared by using the same filler as in Example 1, but by mixing 30 parts by weight of bonding water with respect to 100 parts by weight of the filler (W/B = 30%), and the physical properties of the prepared filler are shown in Table 1 below.

Example 3

Using the same filler as in Example 1, but by mixing 32 parts by weight of bonding water with respect to 100 parts by weight of the filler to prepare a filler (W / B = 32%), the physical properties of the prepared filler is described in Table 1 below.

Comparative Example 1

Using the same filler as in Example 1, a filler was prepared by mixing 26 parts by weight of bonding water with respect to 100 parts by weight of the filler (W/B = 26%), and the physical properties of the prepared filler are shown in Table 1 below.

Comparative Example 2

A filler was prepared by using the same filler as in Example 1, but by mixing 34 parts by weight of bonding water with respect to 100 parts by weight of the filler (W/B=34%), and the physical properties of the prepared filler are shown in Table 1 below.

Test Items		unit	KS F 4042 standard	Comparative Example 1	Example 1	Example 2	Example 3	Comparative Example 2	Test Methods
				(W/B=26%)	(W/B=28%)	(W/B=30%)	(W/B=32%)	(W/B=34%)
compressive strength (28 days)		N/㎟	20.0 or higher	47.6	58.4	55.9	51.7	43.1	KSF 2476
flexural strength (28 days)		N/㎟	6.0 or higher	7.1	8.3	7.9	7.2	6.5	KSF 2476
Attach burglar	Standard dry	N/㎟	1.0 or higher	1.3	1.8	1.9	1.6	1.1	KSF 4042 KSF 4716
	warm and cold after repeat	N/㎟	1.0 or higher	1.2	1.7	1.7	1.4	0.8	KSF 4042 KSF 4716
Consistency		candle	does not exist	32	28	21	19	15	KSF 2432

As can be seen from Table 1, the compressive strength and flexural strength of Examples 1, 2, and 3 in which W/B was applied at 28%, 30%, and 32%, respectively, were found to exceed the standards of KS F 4042. More Specifically, the compressive strength and flexural strength of Comparative Example 1 having a W/B of 26% and Comparative Example 2 having a W/B of 34% exceeded the standards of KS F 4042, but lower than the strength of Examples 1 to 3, respectively. It was found to have strength, and accordingly, it can be seen that the compressive strength and the flexural strength are increased through the filler having a W/B of 26 to 32%.

In addition, the adhesion strengths of Examples 1, 2, and 3 were 1.8N/mm2, 1.9N/mm2, and 1.6N/mm2, respectively, higher than 1.3N/mm2 of Comparative Example 1 and 1.1N/mm2 of Comparative Example 2 It was shown to have strength, and as it was shown that the filler having W/B within the range of Examples 1 to 3 had higher adhesion strength, the three-dimensional fiber by using such a filler in the three-dimensional fiber attachment step It can have the effect of increasing the adhesion between the concrete and the concrete.

In addition, in the case of consistency, which can be seen as a measure of impregnation property and workability, Examples 1 to 3 are made within a range not exceeding 30 seconds, so that a filler having excellent impregnation property and workability can be prepared. Able to know.

However, in the case of Comparative Example 1, as the consistency exceeds 30 seconds, the impregnation property and workability are reduced, and in the case of Comparative Example 2, the consistency is 15 seconds, which is very excellent in the filling of the three-dimensional fibers, but the repair and reinforcement of the structure As the compressive strength, bending strength and adhesion strength of the three-dimensional fiber to be attached are low, there is a need to accompany a separate operation to compensate for this. Inappropriate.

Therefore, by using a filler having a W/B of 28 to 32%, the adhesion between the three-dimensional fibers and concrete is increased by first applying to the concrete, and the durability of the three-dimensional fibers is increased by secondarily applying to the three-dimensional fibers attached to the concrete. to make it happen

In addition, it prevents scouring, aggregate separation, and pop-out, and reduces damage to concrete structures caused by external shocks due to elasticity, as well as high durability against corrosion of reinforcing bars caused by snow removal agents, etc. is to have

As described above, the present invention has been described with reference to the illustrated drawings, but the present invention is not limited by the embodiments and drawings disclosed herein, and various modifications may be made by those skilled in the art within the scope of the technical spirit of the present invention. Of course it can be done.

[Code Explanation]

10: concrete structure 100: three-dimensional fiber

110: surface layer 120: intermediate layer

130: back layer 200: filling three-dimensional fiber

The method of repairing and reinforcing a concrete structure using three-dimensional fibers according to the present invention can greatly contribute to the repair and reinforcement of concrete through the construction of directly attaching the three-dimensional fibers impregnated in the filler to the concrete structure without the construction of a separate reinforcing material.

Claims (6)

1. A surface treatment step of washing the concrete structure to be reinforced (S10);

   Reinforcing agent application step (S20) of applying a reinforcing agent to the concrete structure after the surface treatment step (S10);

   The first filler application step (S30) of applying the filler to the concrete structure after the reinforcing agent application step (S20);

   A three-dimensional fiber attachment step (S40) of attaching the three-dimensional fiber 100 to the concrete structure after the first filler application step (S30);

   A coating material application step of applying a coating material to the three-dimensional fiber after the three-dimensional fiber attachment step (S40) (S60); and

   In the repair and reinforcement method of a concrete structure comprising a curing step (S70) of curing and hardening after the coating material application step (S60),

   The three-dimensional fiber 100 attached in the three-dimensional fiber attachment step has a three-dimensional shape including a surface layer 110, a back surface layer 130, and an intermediate layer 120,

   The surface layer 110 and the back layer 130 are formed in a lattice shape, the lattice spacing of the surface layer 110 is formed in a range of 1 to 5 mm, and the lattice spacing of the back layer 130 is formed in a range of 0.1 to 3 mm. becomes,

   The intermediate layer 120 is formed with a height of 1 to 10 mm between the surface layer 110 and the back layer 130, and has a zigzag shape in which the surface layer 110 and the back layer 130 are sequentially and continuously connected. formed by fibers,

   A method of repairing and reinforcing a concrete structure, characterized in that the three-dimensional fiber (100) is impregnated with a spray gun with a filling slurry in a slurry state prepared by mixing a filler with binding water.
2. The method according to claim 1,

   Repair and reinforcement of a concrete structure using three-dimensional fibers, characterized in that it further comprises a secondary filler application step (S50) of applying a filler to the three-dimensional fibers between the three-dimensional fiber attachment step (S40) and the coating material application step (S60) Method.
3. 3. The method according to claim 2,

   The filler used in the first filler application step (S30) and the secondary filler application step (S50) is prepared by mixing 28 to 32 parts by weight of bonding water with respect to 100 parts by weight of the filler. A method of repairing and reinforcing concrete structures.
4. The method according to claim 1,

   In the three-dimensional fiber attachment step (S40), a filler impregnation step of impregnating the three-dimensional fiber to be attached with the filler material is further included,

   In the filler impregnation step, the three-dimensional fiber impregnated with the filler is attached to the concrete structure coated with the primary filler.
5. The method according to claim 1,

   In the three-dimensional fiber attachment step (S40), a helical bar insertion step of inserting a helical bar into the three-dimensional fiber is further included.
6. 4. The method according to claim 3,

   The filler is usually 60 to 75% by weight of Portland cement, 15 to 25% by weight of fine blast furnace slag powder, 3 to 7% by weight of calcium sulfaluminate, 3 to 7% by weight of silica fume, and 0.2 to 1.0% by weight of a thickener With 0.1 to 0.2 wt% of an antifoaming agent, 1.0 to 5.0 wt% of bentonite and 1.0 to 5.0 wt% of any one of acrylic resin, EVA resin, and SBR resin, melamine-based, naphthalene-based, polycarboxylate-based high-performance fluidizing agent Any one of 0.5 to 3.0% by weight of a concrete structure repair and reinforcement construction method using a three-dimensional fiber, characterized in that it contains.

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