KR100524830B1 - Reinforcement method of the structure and composition for bonding the bundled fiber sheet used therein - Google Patents

Abstract

The reinforcing method of a structure according to the present invention is a method of reinforcing a structure by attaching or impregnating an epoxy resin to a strand of reinforcing fiber and converging the focused fiber sheet focused on a flat surface to the reinforcing surface of the structure. After the resin is removed, the binding fiber sheet adhesive composition, which penetrates into the converging fiber sheet and further cures as it is substituted, is applied to the reinforced surface of the structure to bond the converging fiber sheet, and then the converging fiber sheet is placed on the converging fiber sheet. It is characterized by repeatedly applying the composition for adhesion.

Description

Reinforcement method of the structure and composition for bonding the bundled fiber sheet used therein

The present invention relates to a method for reinforcing a structure to be reinforced by adhering a bundled fiber sheet configured by converging element wires of the reinforcing fiber to the reinforced surface of the structure.

Reinforcing fibers such as carbon fibers and aramid fibers are expected to be used in the concrete field because of their high tensile strength, no corrosion problems, and lightness.

In fact, it is used as a tensioning material for blastless concrete structures, using rods and wires made of reinforcing fibers as a substitute for reinforcing bars for structural damage that is susceptible to salt degradation. This is under review.

In addition, a method of using these reinforcing fibers as a reinforcing material for concrete structures such as columns, piers, tunnels, etc. has already been established. This reinforcement method is to bond the cured fiber sheet, which focuses the reinforced fiber such as carbon fiber or aramid fiber to epoxy on the reinforcement surface of the concrete structure, in one layer or multiple layers by using epoxy resin adhesive, and hardens them. This is to improve the fatigue, fatigue life and deformation plasticity. The epoxy resin adhesive used here uses, for example, a two-component epoxy resin adhesive composed of a bisphenor-A epoxy resin main body and a curing agent.

However, in the past, when the binding fiber sheet is bonded to the reinforcing surface using a two-component epoxy resin adhesive, it has been found that the desired reinforcement is not sufficiently made in the concrete structure.

Therefore, the present inventors adhered to a concrete block by using a conventional two-component epoxy resin adhesive to bond the fiber sheet to the concrete block, and then adhered to another concrete block on top of the test to destroy it, whether the destruction occurs inside the concrete or concrete As a result of observing the occurrence in the surface layer, it was found that the rate of fracture in the concrete surface layer was higher than that in the concrete interior. As a result of confirming the state of the carbon fiber sheet after fracture, it was found that the carbon fiber sheet may cause peeling between wires.

The present inventors thought that this was because the epoxy resin adhesive did not sufficiently penetrate between the strands of the bundled fiber sheet, and attempted to solve the lack of permeability by lowering the viscosity of the adhesive. However, the low viscosity resulted in insufficient penetration. It was not only improved, and even though the penetration was carried out, when the fracture test was carried out, stripping between wires was still found and was not a fundamental solution.

In addition, when the two-component epoxy resin adhesive is conventionally used, the reinforcing fibers have rigidity. Therefore, even when the adhesive is applied to the reinforcement surface and the binding fiber sheet is adhered to and the adhesive is applied thereon, the binding fiber sheet is not flexible. As a result, the gap between the reinforcing surface and the bundled fiber sheet was found to have a problem.

In any case, it has been found that the conventional reinforcing epoxy resin adhesive does not form a positive reinforcing surface even when the bundled fiber sheet is bonded to the structure.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for reinforcing a structure in which the binding fiber sheet is adhered to a concrete structure and the like, and for reinforcing the structure.

As a means for solving the above problems, the method of reinforcing the structure according to claim 1, by attaching or impregnating an epoxy resin to the element wire of the reinforcing fiber to connect the converging fiber sheet to the reinforcing surface of the structure to reinforce the structure After the resin attached to the bundled fiber sheet is removed, the bundled fiber sheet adhesive composition, which penetrates into the bundled fiber sheet and further cures as it is replaced, is applied to the reinforced surface of the structure to bond the bundled fiber sheet. And repeatedly applying the composition for bonding the bundled fiber sheets onto the bundled fiber sheets.

The composition for bonding the bundled fiber sheet according to claim 2 is used as an adhesive in the reinforcing method of the structure according to claim 1, and is composed of an epoxy resin main body (A) and a curing agent (B), and at the same time an essential component of vinyl monomer (C). ), Characterized in that it contains.

The composition for adhering the bundled fiber sheet according to claim 3 is the composition for adhering the bundled fiber sheet according to claim 1, and an epoxy group-containing reactive diluent (D) or / and a binder as an optional component in addition to the vinyl monomer (C) as an essential component. It is characterized by containing (E).

The composition for bonding the bundled fiber sheet according to claim 4 is the composition for bonding the bundled fiber sheet according to claim 2 or 3, wherein the epoxy resin main body (A), vinyl monomer (C), an epoxy group-containing reactive diluent (D), and a binder The proportion of each component in the total amount of (E) is 99-50% by weight of the epoxy resin main body (A), 1-50% by weight of the vinyl monomer (C), and 0-30% by weight of the reactive diluent (D). The binder (E) is 0 to 5% by weight, and the ratio of the curing agent (B) is a required amount based on the ratio of the epoxy equivalent / active hydrogen equivalent in the composition.

It will be described with respect to the embodiment of the reinforcing method of the structure of the present invention and the composition for bonding the bundled fiber sheet used thereto. First, the focusing fiber sheet used for reinforcement, the composition for bonding the focusing fiber sheet used for adhering the sheet to the object to be reinforced, and the object to be reinforced will be described.

As shown in Figure 1, the bundled fiber sheet (S) of the embodiment is a reinforcing fiber (1) made of a sheet shape by dense line of the reinforcing fibers (thickness 7㎛ ~ 10㎛) attached and impregnated with epoxy resin It is made by attaching and covering the base cross (2) and the release paper (3) of the core and reticular structure. It will be cut and used.

Reinforcing fibers (1) include carbon fibers, boron fibers, silicon carbide fibers, glass fibers, organic high-strength fibers (such as aramid fibers), and these fibers include roving, roving cross, strat mat, yarn, and fabric mat. It is used in a suitable form.

Thermosetting resins such as epoxy resins, unsaturated polyester resins, phenol resins, polyimide resins, vinyl ester resins, and aryl resins are used as epoxy resins for concentrating reinforcing fibers, but in some cases, thermoplastic resins are used in combination. May be

The bundled fiber sheet adhesive composition used to bond the bundled fiber sheet (S) to the reinforced surface of the concrete structure is composed of an epoxy main material (A) and a hardener (B), and is an essential component of vinyl monomer (C). Containing is used.

In addition to the vinyl monomer (C) as an essential component, an epoxy group-containing reactive diluent (D) or / and a binder (E) may be included as an optional component.

Epoxy resin The main ingredient (A) contains bisphenol A type epoxy resin, bisphenol AD type epoxy resin, bisphenol F type epoxy resin, and novolak type epoxy resin.

In addition, bisphenol A type epoxy resin, bisphenol AD type epoxy resin, bisphenol F type epoxy resin, bromine epoxy resin, phenol novolak type epoxy resin, cresol novolak type cyclic epoxy resin , Glycidyl ester resins, glycidylamine resins, heterocyclic epoxy resins and the like may be used in combination.

The curing agent (B) contains an aliphatic primary amine (aliphatic diamine, aliphatic polyamine, aromatic ring-containing aliphatic polyamine, alicyclic polyamine, cyclic polyamine, etc.), aromatic primary amine, tertiary amine curing agent, phosphorus-containing or halogen amine-containing. Amine-based curing agents such as hardeners and modified polyamines: Polyaminoamide-based hardeners: Hardeners such as acids or acid-anhydride-based oxidants such as aliphatic anhydrides, aromatic acid anhydrides and halogen-based acid anhydrides are used.

In addition, when dicyandiamide, organic acid dihydride, imidazole, amine imide, Lewis acid or brendstead salt, resol type phenol resin, free resin, melamine resin, isocyanate, block isocyanate, etc. are used There is also.

As the vinyl monomer (C), a (meth) acrylic monomer, a styrene monomer, or a vinyl ester monomer is used.

Other alkyl acrylates, alkyl methacrylates, etc. (meth) acrylic monomers: Styrene monomers such as styrene, vinyl toluene, crawl styrene, etc .: Vinyl ester series such as vinyl acetate, vinyl bropionate, vinyl vasate Beyond: vinyl ether type monomers, such as alkyl vinyl ether: tolyaryl cyanate: diaryl htharate: etc. may be used.

Examples of the reactive diluent (D) containing an epoxy group include olefin oxides, oxylene oxides, butyl glycidyl ethers, styrene oxides, phenol glycidyl ethers, p-butyl butyl glycidyl ethers, glycidyl glycidyl ethers, 3- (pentadecyl) phenylglycidyl ether, glycidyl methacrylate, acrylic glycidyl ether, cyclohexene vinyl monooxide, dibenten monooxide, α-vinene oxide, glycidyl ether of tert-carboxylic acid , Polyethylene glycor diglycidyl ether, neobenzyl glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, glycerin polyglycidyl ether, tolimetrol flopane polyglycidyl ether, etc. Low viscosity polyepoxy compounds: and the like are used.

As the binder (E), a silane-based binder, titanate-based binder, aluminum-based binder, dilconium-based binder, chromium-based binder, organophosphate-based binder, or the like is used.

It is preferable that the ratio of each component in the composition for bonding a bundled fiber sheet is set as follows. That is, the proportion of each component in the total amount of the epoxy resin main body (A), the vinyl monomer (C), the reactive diluent (D) and the binder (E) is 99 to 50% by weight of the epoxy resin main body (A) (particularly 97 to 60% by weight), vinyl monomer (C) 1-50% by weight (particularly 3-40% by weight, among them 5-30% by weight), epoxy group-containing reactive diluent (D) 0-30% by weight (Particularly 1 to 20% by weight), the binder (E) is 0 to 5% by weight (particularly 0 to 3% by weight).

The ratio of the curing agent (B) varies considerably with respect to its type and the epoxy resin base (A) used, but is determined by referring to the optimum amount determined experimentally based on the required amount based on the ratio of epoxy equivalent / cyclic hydrogen equivalent. What is necessary is just to set it as 10-100 weight part with respect to 100 weight part of epoxy resin main bodies (A) generally. In the above quantitative range, the usable time, the curing time, the adhesiveness, the permeability between the strands of the bundled fiber sheet, and the adhesive strength appear as desirable values.

In the composition for bonding the bundled fiber sheet, a plasticizer (butatal: ester plasticizer, phosphate ester plasticizer, dicarboxylic acid ester plasticizer, epoxy plasticizer, polyester plasticizer, epoxy type) within the range not contrary to the spirit of the present invention. Plasticizers, polyester plasticizers, etc.), softeners (petroleum resins, chromane-indene resins, terpene-based resins, low polyisobutylene polymers, rodins, phenols, tars, oils, etc.), solvents (溶劑: It is possible to include additives for decreasing viscosity or improving usability, including hydrocarbon solvents, alcohol solvents, ketone solvents, ester solvents, ether solvents, cellosolve solvents, halogen-containing solvents, nitrogen-containing solvents, and the like. . It is also possible to contain various types of additives used as epoxy resin adhesives.

The composition for bonding the bundled fiber sheets is usually a two-component form of epoxy resin main body (A) and a curing agent (B), and both are mixed immediately before use, or both are simultaneously mixed with a double-ball gun or the like. The vinyl monomer (C), the epoxy group-containing reactive diluent (D), and the binder (E) are either one or both of the epoxy resin main body (A) and the curing agent (B) (in particular, on the epoxy resin main body (A) side). However, depending on the kind or the use of the curing agent (B), it may be a one-component type.

(quid pro quo)

Examples of the object to which the bundled fiber sheet is adhered using the above composition include concrete, metal, PRP, ceramic and plastic surfaces. Particularly important objects are concrete constructions, among others.

Next, the procedure for bonding the focused fiber sheet (S) to the concrete construction as an object is shown below.

First of all, the surface of the reinforced concrete structure is to be reinforced, and the adjustment is carried out such as cracked mortar repair, polishing and removal of the concrete surface deterioration layer.

After the adjustment, apply the composition for bonding the bundled fiber sheet to one surface. In general, a roller brush is used, but depending on the shape of the surface or the direction of the surface, a spatula or a special spray gun may be used to apply a dissolution hardener.

The bundled fiber sheet S is attached to the reinforcing fiber 1 by facing the reinforcing surface so as to be exposed to the side surface of the bundled fiber sheet S, for example, on the coated composition. This causes the bundled fiber sheet S to impregnate the bundled fiber sheet adhesive composition on the one hand while dissolving the epoxy resin that concentrates the reinforcing fibers.

When the release paper is provided on the bundled fiber sheet S, the release paper 3 is removed and the bundled fibers are placed on the bundled fiber sheet S on the base cross 2 hidden under the release paper 3. The composition for sheet bonding is applied. Thus, the bundled fiber sheet S is impregnated with the composition for bonding the bundled fiber sheet while dissolving the epoxy resin for converging the reinforcing fibers.

After applying the splice fiber sheet adhesive composition, the surface of the bundled fiber sheet S is scrubbed with a spatula or the like to promote impregnation of the splice fiber sheet adhesive composition between the strands of the reinforcing fibers.

After application of the above-mentioned composition for adhering the converging fiber sheet, it is waited for a predetermined time to elapse, and if necessary, the composition for adhering the converging fiber sheet for the converging fiber sheet S to the converging fiber sheet S on the base cross 2 Apply. If it is necessary, it waits for a predetermined time to pass again, and repeats application of the composition for bonding the bundled fiber sheets any number of times.

After completion of the coating work of the composition for bonding the bundled fiber sheets, the curing of the composition for bonding the bundled fiber sheets is awaited to complete reinforcement of the concrete structure. However, it is also possible to stack the focused fiber sheet (S) by repeating the above procedure to further increase the strength. In this case, the curing period of each layer depends mainly on the climate, but generally it is necessary to secure about 1 to 4 hours.

When the binding fiber sheet (S) is bonded to the reinforced surface of the concrete structure according to the above procedure, the binding fiber sheet (S) itself becomes a reinforcement, and the binding fiber sheet (S) is not only bonded to the object surface. The vinyl monomer (C) in the composition penetrates into the bundled fiber sheet (S), and a part of the coating covering the surface of the reinforcing fiber (1) is removed at the same time as the composition is replaced with the composition to form a strong elementary bond. In addition, since the adhesive strength by the composition is extremely strong, for example, when the object is a concrete structure, even if the fracture test is performed, the rate of destruction is increased more than the surface of the structure, and the desired reinforcement is achieved.

In addition, as the vinyl monomer (C) in the composition penetrates into the bundled fiber sheet (S), the bundled fiber sheet (S) becomes flexible, and bubbles are hardly generated during the bonding operation. (S) is in close contact with each other, so no reinforcement is achieved.

In addition, the use of the composition for bonding the focusing fiber sheet has an advantage that the composition is good because the composition penetrates into the binding fiber sheet even when the adhesive work in the posture looking up.

In addition, when the epoxy group-containing reactive diluent (D) is included in the composition, the viscosity decreases while the lowering of the adhesive strength is suppressed, and thus the workability is improved, and when the binder (E) is contained, the adhesive strength is further improved.

(Example)

Next, an Example is given and this invention is demonstrated in detail. Hereinafter, what is indicated by "part" and "%" is represented on a weight basis.

(Concentrated fiber sheet)

A commercially available bundled fiber sheet having a standard weight of 300 g / m 2, prepared by sheeting carbon fiber strands in one direction using an epoxy resin as a binding agent, was prepared. Here, the bundled carbon fiber sheet used in this embodiment is bonded with a rough cross of glass fiber on one side to prevent decomposition, and is covered with a release paper on it to prevent adhesion. In addition, this release paper is to be removed and used in the bonding portion on the reinforcing surface.

(Preparation of Composition for Bonding Fiber Sheet)

Prepare each of the following ingredients.

Epoxy Resin Motif (A)

(biA): Liquid bisphenol A epoxy resin

(biF): Bisphenol F type epoxy resin

(AAD): A mixture of 1: 1 in the weight ratio of the liquid bisphenol A epoxy resin and the bisphenol AD epoxy resin

Curing agent (B)

(PAm): Polyamine Curing Agent

(mPA): mixture of modified resin-based polyamine and modified alicyclic polyamine

(mAA): modified polyamino amide

Vinyl Monomer (C)

(MMA): methyl methacrylate

(EAc): ethyl acriret

(Sty): Styrene

(VAC): Vinyl Acetate

Epoxy Group-Containing Reactive Diluent (D)

(BGE): Butyl Glycidyl Ether

(APG): alkyl phenol glycidyl ether

(AGD): Alkylene glycol diglycidyl ether

Binder (E)

(Si1): Silane binder

(Tit): titanate-based binder

Solvent (Fr)

(Tol): toluene

(Xyl): xylene

(Fur): fluffle alcohol

(Ben): benzene alcohol

(Aoe): acetone

(MEK): methylethyl ketone

(Search test)

In order to find the optimal prescription composition, the composition of the prescription of the following Table 1 (Example) and Table 2 (Comparative Example) is prepared by using each of the components to penetrate into the bundled fiber sheet, softening effect on the bundled fiber sheet, and focused. Breakdown situation when fiber sheet is sandwiched between concrete blocks (breaking of concrete inside, destruction of concrete surface, peeling between wires occurred), breakdown situation when bonding fiber sheet stuck between steel blocks and bonding M (Destruction at the interface of both protons or peeling between wires). The evaluation was judged in three stages of ○ (effective), Δ (slightly dropped), and × (falled) from the viewpoint of practicality. However, the viscosity was adjusted to a suitable viscosity range for selecting and applying the proportion of vinyl monomer (C), epoxy group-containing reactive diluent (D) or solvent (F) (however, the composition of the comparative example has a slightly high viscosity). The usage-amount of a hardening | curing agent (B) was made into the required amount based on the ratio of epoxy equivalent / active hydrogen equivalent in consideration of the composition of the main side.

Table 1

[Table 2]

(Permeability test for focused fiber sheet)

The permeability to the bundled fiber sheets was investigated using 600 g of each of the compositions of Formulas 1 to 6 above, and 800 g of each of the epoxy resin adhesives for commercially available typical epoxy resin bundled fiber sheets.

As described above, the focused fiber sheet (1 ply, 300 g / m 2 of the reference weight) was cut to a size of 200 mm × 200 mm, and the adhesion test was carried out according to the following procedure in an environment of a temperature of 15 ° C.

When using the composition of prescription 1-6

1. Apply the composition to the concrete surface with a roller brush.

2. Bond the carbon fiber sheet on the first sheet and remove the release paper.

3. The composition is applied thereon and left for 5 minutes.

4. Again apply the composition thereon.

5. Press with a rubber spatula and leave for 5 minutes.

6. Apply the composition thereon.

7. The above operations 2 to 6 are repeated twice.

When using two commercially available epoxy resin adhesives

1. Apply adhesive to the concrete surface with a roller brush.

2. Bond one carbon fiber sheet.

3. Press the rubber spatula and remove the bubble.

4. Leave for 10 minutes.

5. Apply adhesive on it.

6. Press the rubber spatula and remove bubbles.

7. The above operations 2 to 6 are repeated twice.

· result

In the case of using the compositions of the formulations 1 to 6, in spite of the comparatively low temperature of 15 ° C in any case, the composition was reliably impregnated into the bundled fiber sheet and no bubbles were found inside. Observation of the cut surface further confirmed that the fibers of the sheet were not in a hairy state and the composition was sufficiently impregnated.

On the other hand, when two commercially available epoxy resin adhesives were used, the adhesives were difficult to impregnate to the inside of the fiber sheet and bubbles were generated. Observation of the cut surface also confirmed that the fibers in the sheet were fluffing like hair and the impregnation of the adhesive was insufficient.

(Upper posture test of focused fiber sheet)

Adhesion to the lower surface of the concrete plate of 80 mm × 500 m × 1,500 mm (pre-washed and acid-treated) using 600 g of each of the compositions 1 to 6 and the above-mentioned converging fiber sheet. Was carried out in the following procedure.

1. Apply adhesive to the concrete surface with a roller brush.

2. Bond one carbon fiber sheet.

3. Press with a rubber spatula and leave for 5 minutes.

4. Apply the composition on it again and leave for 5 minutes.

5. Apply the composition on it again and leave for 5 minutes.

6. Repeat the above operations 2 to 4 four times.

· result

When the compositions of Formulations 1 to 6 were used, the temperature was 25 ° C. compared with any of them, but the excellence was good. The construction of 1 ply of bundled fiber sheets was completed for 18 minutes, and the other time for application was about 3 minutes. Three plies are completed in about 54 minutes and five plies in about 90 minutes.

(Thickness direction tensile test of focused carbon fiber sheet)

Tensile strength of the bundled carbon fiber sheets was investigated using the composition of Formulas 1 to 6 described above and two types of commercially available epoxy resin focused carbon fiber sheet sheets. The test number n was set to three.

After impregnating the composition or adhesive to the above-described three-ply bundled carbon fiber sheet, the composition is cut into a size of 40 mm × 40 mm, and the steel attachments of the cubes of 40 mm × 40 mm × 40 mm are bonded to both sides thereof, and left for 24 hours. After that, both attachments were spaced apart in opposite directions to perform a tensile strength test. The tensile speed was 6 mm / min. Table 3 shows the results of Prescription 1 and Commercial Product 1.

In the case of Formulas 2-6, the result of the sheet | seat and steel adhesive agent was shown in Table 3 similarly to prescription 1.

In the case of the commercial item 2, peeling between the wires of the sheet was generated similarly to the commercial item 1.

Table 3

(Compression shear strength test of focused carbon fiber sheet on concrete)

Compressive shear strength was measured in accordance with JIS K6852 using the compositions of Formulations 1 to 6 above and two epoxy resin adhesives (commercially available product 1 and commercially available product 2) for adhering a typical epoxy resin focused fiber sheet. The test number n was set to three.

The wet side was applied and bonded with the composition or adhesive without wiping off the water on the concrete surface soaked in water for 24 hours.

The wet side was wiped with water on the surface of the concrete soaked in water for 24 hours to apply and bond the composition or adhesive.

· The curing was put in a plastic bag and sealed and cured at 20 ° C. for 7 days.

Table 4

When applied to wet surfaces

The results of Prescription 1 and Commercial Product 1 are shown in Tables 4 and 5. Table 4 is applied to wet surfaces and Table 5 is applied to wet surfaces. In the case of prescriptions 2 to 6, the same tendency was observed as in prescription 1. The commercial item 2 showed the same tendency as the commercial item 1.

TABLE 5

When applied to wet surfaces

Tensile Adhesion Strength Test of the Focused Carbon Fiber Sheet on Concrete

The above composition 1 to 6 and two epoxy resin adhesives (commercially available product 1 and commercially available product 2) for adhering commercially available epoxy resin carbon fiber sheet are used, and the surface is moistened with a wet surface (water moistened on a concrete surface soaked in water for 24 hours). Or by applying an adhesive and measuring the tensile adhesive strength for adhesion) to observe the fracture state. The test number n was set to three. The results are shown in Table 6.

In other tests, the above composition or adhesive is impregnated with the above-described three-ply bundled carbon fiber sheet, cut into 40 mm x 40 mm, and the wet concrete is bonded to both sides of the steel sheet having a size of 40 mm x 40 mm. The attachment was attached to the back of the concrete and allowed to stand for 24 hours, after which the tension test was performed so that the attachment fell in the opposite direction. The tensile speed was 6 mm / minute. Table 6 shows the results of Prescription 1 and Commercial Product 1. In the case of prescriptions 2-6, the result of the commercial item 1 similar to the prescription 1 is shown in Table 6. In the case of the prescriptions 2 to 6, the same tendency as the prescription 1 was shown. In the case of commercial item 2, the same trend as commercial item 1 was observed.

Table 6

When applied to wet surfaces

According to the reinforcing method of the structure of the present invention, by using the composition for bonding the adhesive fiber sheet adhesive sheet, the binding fiber sheet (particularly, the carbon fiber sheet focused with epoxy resin) is adhered to the object (especially concrete construction) to be strong and reliable. By adhering, the desired reinforcing purpose is achieved. As for the adhesive work, no bubbles are generated and the focused fiber sheet is in close contact with the object surface, so that there is no gap, and the reinforcing effect is exhibited to the maximum. In addition, since the composition penetrates into the focused fiber sheet even when the adhesive work in an upward posture, the ease of construction is improved.

1 is an exploded perspective view showing one embodiment of a reinforcing sheet used for reinforcing a structure of the present invention.

* Explanation of symbols for main parts of the drawings

S: Reinforcing Sheet 1: Reinforcing Fiber

2: cross based 3: release paper

Claims (4)

In the reinforcing method of the structure to reinforce by attaching or impregnating the epoxy resin to the element wire of the reinforcing fiber by bonding the focused fiber sheet focused on the plane to the reinforcing steel surface of the structure, After removing the resin imparted to the focused fiber sheet on the reinforcing surface, the composition is applied to the bundled fiber sheet adhesive composition that is hardened while being substituted with them by infiltrating into the bundled fiber sheet and adhering the bundled fiber sheet and then bonding the bundled fiber sheet. Reinforcing method of the structure, characterized in that the coating composition for bonding the focused fiber sheet In the composition for bonding the bundled fiber sheets used in the method for reinforcing the structure according to claim 1, comprising the epoxy resin main body (A) and the curing agent (B), and containing vinyl monomer (C) as an essential component. A composition for bonding the focused fiber sheet, characterized in that. The composition for bonding a bundled fiber sheet according to claim 2, wherein an epoxy group-containing reactive diluent (D) or / and a binder (E) are contained as an optional component in addition to the vinyl monomer (C) as an essential component. The ratio of each component in the content of epoxy resin main body (A) and vinyl monomer (C), an epoxy-group-containing reactive diluent (D), and a binder (E) of Claim 2 and 3 is an epoxy resin. 99-50 wt% of the major (A), 1-50 wt% of the vinyl monomer (C), 0-30 wt% of the reactive diluent (D), 0-5 wt% of the binder (E), and a curing agent. The composition for bonding the bundled fiber sheets, wherein the ratio of (B) is a required amount based on the ratio of epoxy equivalents / active hydrogen equivalents in the composition.