JPH10339040A - Reinforcing method for structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing method for a structure, allowing the proper handling of reinforcing resin in the winter season, in particular under a low temperature condition, and ensuring the resin to be firmly applied to a reinforcing surface, regarding the case where a primer layer is formed on the reinforcing surface of the structure, a putty layer is then formed on the primer layer whenever necessary, a resin impregnated solution is thereafter applied to the surface of the formed primer layer (or putty layer where formed) before and/or after attaching a fabric sheet to the surface of the formed primer layer or putty layer so as to cause a fabric sheet gap to be impregnated with the solution, and then the impregnated resin is cured to reinforce the structure. SOLUTION: A mixture of a resin composition containing 60 to 85 wt.% of epoxy resin. 15 to 40 wt.% of diatomic alcohol digrycisil ether or the like, and a hardener composition containing 60 to 100 wt.% of Mannich hardener and 0 to 40 wt.% of aliphatic polyether diamine is used as a primer, a putty and impregnated resin. In this case, a ratio of the number of activated hydrogen atoms to the number of functional groups in the resin composition is taken at a value within the range of 1:0.85 to 1:1.2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reinforcing a structure, and more particularly, to a method for reinforcing a structure in which a fiber sheet is applied together with a resin on the surface of the structure.

[0002]

2. Description of the Related Art Conventionally, concrete has been widely used as a main structure of concrete structures such as bridge piers, highway supports, and buildings. Concrete suppresses corrosion of internal reinforcing steel by its strong alkalinity, but it loses alkalinity from its surface and becomes neutralized by carbon dioxide gas in the air for many years. And
When the neutralization reaches the rebar, the rebar starts to corrode and increase in volume, causing cracks in the concrete structure and accelerating the deterioration of the structure.

[0003] When an excessive force is applied due to an earthquake, land subsidence, overload, or the like, a concrete structure may have defects such as cracks, collapses, and partial omissions. Further, the strength of a concrete structure may be reduced for various reasons or may be insufficient from the design stage.

[0004] In order to remove the above-mentioned defects or to reinforce the lack of strength in a preventive manner, a method has been proposed in which a carbon fiber prepreg is applied to a concrete surface to reinforce it. For example, JP-A-7-34677 discloses that a cold-setting resin such as an epoxy resin, a urea resin, a resorcinol resin, and a phenol resin is applied as a primer on a reinforcing surface, and the basis weight is 200 g / m ² or more. In addition, there is a method for reinforcing a structure in which a carbon fiber prepreg having a resin content of 15% by weight or less is attached, and the above-mentioned room temperature-curable resin such as an epoxy resin is applied and cured from above the carbon fiber prepreg. Proposed.

In the above reinforcing method, in order to enhance the reinforcing effect, it is necessary that the fiber sheet has a high tensile strength and that the fiber sheet is firmly adhered to the surface of the structure.

However, when a structure is reinforced by using the above-described resin, the resin hardens slowly or does not sufficiently harden under a low temperature condition in winter. Therefore, the carbon fiber sheet is applied to the reinforcing surface of the structure. The adhesion of the reinforcing layer tends to be insufficient. As a result, the adhesion of the fiber sheet reinforcing layer after the completion of the reinforcing work is easily separated by an external force, and the reinforcing effect cannot be sufficiently exhibited.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to form a primer layer on a reinforcing surface of a structure and, if necessary, put a primer layer on the primer layer. After the layer is formed, before and / or after the fiber sheet is applied to the surface of the formed primer layer (the putty layer in the portion where the putty layer is formed), an impregnating resin is applied to fill the voids of the fiber sheet. When reinforcing a structure that is made to penetrate and harden the impregnated resin, the handleability of the applied resin is good even in winter, especially under low temperature conditions, and the application of the resin increases the strength of the fiber sheet and enhances the reinforcing surface. It is an object of the present invention to provide a method for reinforcing a structure that can be firmly attached to a structure.

[0008]

That is, the gist of the present invention is that a primer layer is formed on a reinforcing surface of a structure, a putty layer is formed on the primer layer if necessary, and then the formed primer layer ( Before and / or after the fiber sheet is applied to the surface of the putty layer in the portion where the putty layer is formed, the impregnating resin is applied to penetrate the voids of the fiber sheet and harden the structure to cure the impregnated resin. In the method, as the primer, putty and impregnated resin described above, (1) 25 ° C
Epoxy resin 60 having a viscosity of 150 PS or less
~ 85% by weight, dihydric alcohol diglycidyl ether 15 ~ 40% by weight, acrylic oligomer 0 ~ 15% by weight
And a mixture of a resin composition containing 0 to 5% by weight of a thixotropic agent and (2) a curing agent composition containing 60 to 100% by weight of a Mannich-type curing agent and 0 to 40% by weight of an aliphatic polyetherdiamine. At this time, (3) the ratio of the number of active hydrogens in the curing agent composition to the number of functional groups in the resin composition is set to 1:
The present invention provides a method for reinforcing a structure, characterized in that the structure is adjusted to a range of 0.85 to 1: 1.2.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The reinforcing method of the present invention is to form a primer layer on the reinforcing surface of the structure, and after forming a putty layer on the surface as necessary,
The method comprises applying a fiber sheet to the surface, applying an impregnating resin before and / or after applying the fiber sheet, and curing the impregnated resin impregnated in the fiber sheet.

The structures to which the method of the present invention can be applied include, for example, concrete piers, concrete columns for elevated structures such as railways and highways, columns and wall surfaces for concrete structures, and floorboards for roads. And structures having a reinforcing effect by attaching a fiber sheet to the surface, such as metal pillars and wooden pillars.

If necessary, before the formation of the primer layer, the above structures are subjected to removal of extraneous matter such as surface latencies, and if there are irregularities, scratches, local collapse, or missing parts on the surface. Pre-processing such as repair is performed. For the above repairs, resin mortar or resin concrete, resin cement, resin, or a material similar to the material constituting the structure, which is a mixture of resin, sand, gravel, and crushed stone, is usually used.

The above-mentioned fiber sheet is formed by impregnating a small amount of resin into a fiber material and maintaining the shape of the sheet. Examples of the above-mentioned fiber material include carbon fiber, aramid fiber and glass fiber. Among them, carbon fiber is practical from the viewpoint of reliability. As such a fiber sheet, a fiber material may be a fiber sheet-like material in which the fiber material is arranged in a sheet shape such as a woven fabric or a nonwoven fabric, but long filamentary fibers are arranged in one direction from the viewpoint of strength development. Sheets are particularly preferred.

The basis weight of the fiber material in the fiber sheet is usually 1
Although it is set to 00-600 g / m < ² >, especially, 200 g / m < ² > or more is preferable practically. The amount of resin in the fiber sheet impregnated to maintain the above-mentioned fiber material in a sheet shape is usually 15% by weight or less, preferably 4 to 8%.
% By weight. As the resin impregnated to maintain the shape of the fiber sheet, a high-temperature thermosetting resin having a curing temperature of 70 ° C. or higher is usually used. Specific examples of such a resin include a phenol resin, an epoxy resin, an unsaturated polyester resin, a diallyl phthalate resin, a bismaleimide resin, a polyamideimide resin, a melamine resin, and a polyurethane resin.

The above primer, putty and impregnated resin are:
(1) an epoxy resin, a dihydric alcohol-based diglycidyl ether and, if necessary, a resin composition containing an acrylic oligomer and a thixotropic agent, and (2) a Mannich-type curing agent and, if necessary, an aliphatic polyetherdiamine. And a mixture with a curing agent composition containing

The above epoxy resin has a viscosity at 25 ° C. of 150 PS (poise) or less, preferably 40 PS (poise).
An epoxy resin having a PS or lower is used, and specifically, a bisphenol F type epoxy resin and / or a bisphenol A type epoxy resin are preferably used.

The above bisphenol F type epoxy resin is usually produced by bonding epichlorohydrin to a hydroxyl group of bisphenol F. Bisphenol F type epoxy resin is a bifunctional resin. Generally, when producing a bisphenol F type epoxy resin, in addition to a low molecular weight resin corresponding to n = 0 of a phenol novolak epoxy resin according to a molar ratio of bisphenol F to epichlorohydrin, resins having various larger molecular weights can be obtained. It is by-produced. In the present invention, as the bisphenol F epoxy resin, a resin having a high content of a low molecular weight resin corresponding to n = 0 and having a viscosity at 25 ° C. of 150 PS or less is used. And a resin of 40 PS or less is preferable,
Resins of 35 PS or less are more preferred.

The bisphenol A type epoxy resin is produced by reacting epichlorohydrin with the hydroxyl group of bisphenol A. The bisphenol A type epoxy resin is a bifunctional resin as in the case of the bisphenol F type epoxy resin. The bisphenol A type epoxy resin is a mixture of resins having various molecular weights depending on the molar ratio of bisphenol A and epichlorohydrin. In the present invention, the bisphenol A type epoxy resin has a low average molecular weight and a viscosity at 25 ° C of 150.
Resins having a PS or less are used.

The dihydric alcohol-based diglycidyl ether is a reactive diluent, a diluent for lowering the viscosity of the resin composition to be prepared, and is cured by reacting with a amine of a curing agent. It becomes one component of the resin layer formed by the above. As such a dihydric alcohol diglycidyl ether, for example, 1,6-hexanediol diglycidyl ether is preferably exemplified.

The acrylic oligomer is also a reactive diluent, as in the case of the dihydric alcohol-based diglycidyl ether, and is a diluent for lowering the viscosity of the prepared resin composition. At the same time, it becomes one component of the resin layer formed by being cured by the reaction of the curing agent with the amine. As the acrylic compound constituting such an acrylic oligomer, for example, acrylic acid, methacrylic acid,
Examples thereof include alkyl acrylate and alkyl methacrylate.

The thixotropic agent is added to suppress dripping of the impregnated resin obtained by mixing the resin composition and the curing agent composition. Examples of such a thixotropic agent include various inorganic fine particles. Specifically, for example, silica fine powder is suitably used.

The above resin composition contains 60 to 85% by weight of the above epoxy resin, 15 to 40% by weight of a dihydric alcohol diglycidyl ether, 0 to 15% by weight of an acrylic oligomer and 0 to 5% by weight of a thixotropic agent. Including.

The above-mentioned Mannich curing agent is a curing agent containing a Mannich base compound as a base amine. The Mannich base compound refers to a compound having a structure in which active methylene carbon is aminomethylated. Examples of the above-mentioned Mannich-type curing agent include a curing agent having metaxylene diamine, isophoronediamine or the like as a base amine, and among them, a curing agent having metaxylene diamine as a base amine is preferable.

Examples of the aliphatic polyether diamine include polyoxypropylene diamine and polyoxypropylene triamine.

The above curing agent composition contains 60 to 100% by weight of the above-mentioned Mannich type curing agent and 0 to 40% by weight of the aliphatic polyether diamine.

When preparing the primer, putty and impregnated resin by mixing the above resin composition and the hardener composition, the number of active hydrogens in the hardener composition relative to the number of functional groups in the resin composition is determined. Adjust the ratio in the range of 1: 0.85 to 1: 1.2. Specifically, a resin composition containing 60 to 85% by weight of an epoxy resin, 15 to 40% by weight of a dihydric alcohol-based diglycidyl ether, and (2) a Mannich type curing agent 60 to
100% by weight and aliphatic polyether diamine 0 to 40
The theoretically active hydrogen in the curing agent composition is 1: 0.85 to 1: 1.2 equivalents with respect to the amount in which the theoretical functional group in the resin composition becomes 1 equivalent. What is necessary is just to mix so that it may become a certain ratio. When the above ratio exceeds 1: 1.2, the cured physical properties are reduced, and the above ratio is 1: 0.8.
If it is less than 5, poor curing and poor cured physical properties will result. The functional group in the present invention means a group capable of reacting with and binding to active hydrogen. In the present invention, the functional group includes an epoxy group and an acrylate group.

The above primer, putty and impregnated resin may further include a filler such as silica sand, a coloring agent such as titanium oxide, a light stabilizer, a heat stabilizer, a light shielding material, a penetrant, a silane coupling agent, if necessary. And a solvent such as thinner, methyl ethyl ketone and acetone. These additive components can be appropriately added to the resin composition and the curing agent composition before mixing the composition with the composition before mixing.

The basic composition of each of the resin composition and the hardener composition used to prepare the primer, putty and impregnating resin may be identical to each other for the primer, putty and impregnating resin. And may be different. At that time, from the viewpoint of utilization performance, the viscosity of the primer at 0 ° C. is usually 20 to 100 PS, preferably 20 to 50
In S, the viscosity at 0 ° C. of the putty is usually 500 to 100.
The viscosity at 0 ° C. of the impregnated resin is adjusted to 0 to 100 PS, preferably 600 to 800 PS, and usually 50 to 150 PS, preferably 50 to 100 PS. Such viscosity adjustments are usually made with reactive diluents, thixotropic agents and / or
Alternatively, the addition can be performed by increasing or decreasing the amount of the filler.

The above-mentioned primer layer is formed by applying a primer on the reinforcing surface and curing the primer. The appropriate amount of application at that time depends on the state of the reinforcing surface, but is usually 50 to 500.
g / m ^2, preferably 100 to 300 g / m ^2. In addition, as a method of applying the primer, a known method such as a brush coating method and a roll coating method is employed. The applied primer can be sufficiently cured even in a low temperature environment such as -5 to 0 ° C. The touch hardening time varies depending on the resin composition, the hardener composition, the blending amount of the hardener, the environmental temperature, and the like, but is generally about 8 to 18 hours.

The above-mentioned putty layer is usually used when the reinforcing surface of the structure has irregularities, if necessary, after curing of the primer layer.
A required amount of putty is applied to a required portion of the surface of the primer layer so as to level the above-mentioned unevenness, and is cured.
As a method for applying the putty, a known method is employed. The above putty can be sufficiently cured even in a low temperature environment such as -5 to 0C. The finger touch hardening time varies depending on the resin composition, the hardener composition, the compounding amount of the hardening agent, the compounding amount of the filler, the environmental temperature, and the like, but is generally about 8 to 18 hours.

The fiber sheet layer is formed by applying a fiber sheet impregnated with an impregnating resin to the surface of a primer layer (a putty layer in a portion where a putty layer is formed) and curing the impregnated resin. . Such a fiber sheet can have a plurality of layers laminated. As a method for impregnating and impregnating the fiber sheet with the impregnating resin, the following methods can be exemplified, but the method is not limited to these methods. That is, (1)
A method in which an impregnating resin is applied to the surface of a primer layer (a putty layer in a portion where a putty layer is formed), and a fiber sheet is applied to the applied surface. (2) First, a fiber sheet is applied to the surface of the primer layer (the putty layer in the portion where the putty layer is formed), and an impregnated resin is applied to the surface of the fiber sheet. (3) First,
After applying the impregnating resin to the surface of the primer layer (the putty layer in the portion where the putty layer is formed), a fiber sheet is applied to the applied surface, and the impregnating resin is further applied to the fiber sheet surface. Among them, the method (3) is particularly preferable.

The composition of the impregnating resin applied to the surface of the primer layer (the putty layer in the portion where the putty layer is formed) before the application of the fiber sheet is the same as the composition of the impregnating resin applied to the surface of the fiber sheet after the application. Or may be different,
It is preferable that they are the same from the viewpoint of adhesiveness.

The amount of the impregnating resin applied to the surface of the primer layer (the putty layer in the portion where the putty layer is formed) and the surface of the fiber sheet are determined by taking into account the basis weight of the fiber sheet and the void content thereof. (The part where the putty layer is formed and further the putty layer) is appropriately determined within a range where it can be continuously integrated, and is usually 200 to 800 g / m ² , preferably 300 to 500 g / m ² . In addition, when the impregnating resin is applied to both the surface of the primer layer (the putty layer in the portion where the putty layer is formed) and the surface of the fiber sheet, the application amount of each is the total of both the fiber sheet and the primer layer (the putty layer is formed). In the portion, the amount can be appropriately reduced as far as the putty layer can be continuously integrated.

As a method for applying the above impregnated resin, the known methods as described above are employed. Then, when applying the impregnated resin, it is preferable to press down from the front side of the fiber sheet using a roller or the like before curing, preferably immediately after the application, to remove bubbles remaining on the back side of the fiber sheet. Note that the applied impregnated resin can be sufficiently cured even in a low-temperature environment such as -5 to 0C. The touch hardening time varies depending on the resin composition, the hardener composition, the blending amount of the hardener, the environmental temperature, and the like, but is generally about 8 to 18 hours.

As a result, the fiber sheet is completely and continuously integrated with the primer layer (and further the putty layer in the portion where the putty layer is formed) by the impregnating resin, and is firmly integrated with the surface of the structure by curing of the impregnating resin. It is adhered. At the same time, the applied fiber sheet is firmly joined to each other by curing the impregnated resin to form a fiber sheet layer having high tensile strength.

[0035]

The present invention will be described below in more detail with reference to examples. The present invention is not limited to each of the following examples unless it exceeds the gist. In each of the following Examples and Comparative Examples, a concrete plate was used as a structure for convenience in order to simulate the effect of reinforcing the structure. Also,
Putty is originally used only on the surface irregularities in order to smooth the surface irregularities, but in this example, it was applied to the entire surface of the primer layer in order to evaluate its adhesiveness. In addition, as a reinforcing effect, an adhesive strength and a peel strength test between the concrete plate and the fiber sheet, and a tensile strength of the fiber sheet impregnated with the impregnated resin were evaluated. , Pot life, applicability, impregnation, and thixotropic properties were evaluated. In addition, the preparation of each material and the test method for evaluation used in each Example and Comparative Example are as follows.

<Materials>: (1) <Concrete board> As a structure for a reinforcement test, the surface dimensions are 30 cm × 30 c.
m, a 5 cm thick concrete plate was used. The latency of the surface layer of this concrete plate was removed by a disk sander to prepare 12 test concrete plates.
It was left in a room at 24 ° C. for 24 hours or more before use.

(2) <Fiber sheet 1> A carbon fiber sheet (Riperak 30 type, manufactured by Mitsubishi Chemical Corporation, 300 g / m ² ) was previously placed in a room at 0 ° C.
After leaving for 4 hours or more, it was used.

(3) <Primer 1> In advance, (i) 73 parts by weight of a bisphenol F type epoxy resin having a viscosity of 35 PS at 25 ° C., 27 parts by weight of 1,6-hexanediol diglycidyl ether, and a silane coupling agent ( Shin-Etsu Chemical's product “KBM-
403 ") 0.5 parts by weight were mixed with a mixer and left in a room at 0 ° C. for 24 hours or more, and separately (ii) a Mannich type curing agent 56 containing metaxylenediamine as a base amine.
After the weight parts were left in a room at 0 ° C. for 24 hours or more, they were mixed well immediately before use. The ratio of the number of epoxy groups to the number of active hydrogens in the primer 1 obtained by mixing both was 1.0.

(4) <Primer 2> (i) 75 parts by weight of a bisphenol F type epoxy resin having a viscosity of 35 PS at 25 ° C., 17 parts by weight of 1,6-hexanediol diglycidyl ether, and 8 parts by weight of an acrylic oligomer And 0.5 parts by weight of a silane coupling agent (product “KBM-403” manufactured by Shin-Etsu Chemical Co., Ltd.) were mixed with a mixer and left in a room at 0 ° C. for 24 hours or more, and separately (ii) a base based on meta-xylene diamine After leaving 60 parts by weight of a Mannich type curing agent as an amine left in a room at 0 ° C. for 24 hours or more, the two were mixed well immediately before use. The ratio of the number of epoxy groups and acrylate groups to the number of active hydrogens in the primer 2 obtained by mixing both was 1.0.

(5) <Primer 3> (i) 100 parts by weight of a main component of a two-liquid room-temperature-dry epoxy resin (“XPS-301R” manufactured by Mitsubishi Chemical Corporation) and (ii) a two-liquid room-temperature-dry type After 50 parts by weight of a curing agent for epoxy resin (“XPS-301H” manufactured by Mitsubishi Chemical Corporation) were separately left in a room at 0 ° C. for 24 hours or more, they were mixed well immediately before use.

(6) <Pate 1> A resin composition comprising (i) 73 parts by weight of a bisphenol F epoxy resin having a viscosity of 35 PS at 25 ° C. and 27 parts by weight of 1,6-hexanediol diglycidyl ether And 100 parts by weight of silica sand, and (i
i) 56 parts by weight of a Mannich-type curing agent and 56 parts by weight of silica sand each having a metaxylene diamine as a base amine were separately mixed by a mixer, and allowed to stand in a room at 0 ° C. for 24 hours or more. Used mixed. The ratio of the number of epoxy groups to the number of active hydrogens in Putty 1 obtained by mixing both was 1.0.

(7) <Pate 2> (i) 75 parts by weight of a bisphenol F type epoxy resin having a viscosity of 35 PS at 25 ° C., 17 parts by weight of 1,6-hexanediol diglycidyl ether, and 8 parts by weight of an acrylic oligomer And 100 parts by weight of silica sand, and (ii) 60 parts by weight of a Mannich-type curing agent containing metaxylenediamine as a base amine and 60 parts by weight of silica sand were separately mixed with a mixer and mixed in a 0 ° C room.
After standing for more than an hour, the two were mixed well immediately before use. The ratio between the number of epoxy groups and acrylate groups and the number of active hydrogens in putty 2 obtained by mixing both is 1.
It was 0.

(8) <Pate 3> In advance, (i) 100 parts by weight of a main component of a two-liquid cold-drying epoxy putty (Mitsubishi Chemical's product "L-520R") 100 parts by weight, and (ii) a two-liquid cold-drying epoxy putty Was separately left in a room at 0 ° C. for 24 hours or more, and the two were mixed well immediately before use.

(9) <Impregnated Resin 1> (i) 73 parts by weight of a bisphenol F type epoxy resin having a viscosity of 35 PS at 25 ° C., 27 parts by weight of 1,6-hexanediol diglycidyl ether, silica fine particles (Japanese) Aerosil product "RY-200S") 2
Parts by weight and 1 part by weight of a color toner (“ECB-401” manufactured by Dainippon Color Materials Co., Ltd.) were mixed with a mixer to obtain 0 parts by weight.
(Ii) Separately, 56 parts by weight of a Mannich-type curing agent containing metaxylenediamine as a base amine was left in a room at 0 ° C. for 24 hours or more. Used. The ratio between the number of epoxy groups and the number of active hydrogens in the impregnated resin 1 obtained by mixing both was 1.0.

(10) <Impregnated resin 2> (i) 75 parts by weight of a bisphenol F type epoxy resin having a viscosity of 35 PS at 25 ° C., 17 parts by weight of 1,6-hexanediol diglycidyl ether, and 8 parts by weight of an acrylic oligomer Parts, 2 parts by weight of silica fine particles (product “RY-200S” manufactured by Nippon Aerosil Co., Ltd.) and 1 part by weight of color toner (product “ECB-401” manufactured by Dainippon Color Materials Co., Ltd.) were mixed with a mixer and placed in a room at 0 ° C. (Ii) Separately, 60 parts by weight of a Mannich type curing agent containing metaxylenediamine as a base amine was left in a room at 0 ° C. for 24 hours or more, and both were mixed well immediately before use. The ratio of the number of epoxy groups and acrylate groups to the number of active hydrogens in the impregnated resin 2 obtained by mixing both was 1.0.

(11) <Impregnated resin 3> (i) 73 parts by weight of a bisphenol F type epoxy resin having a viscosity of 35 PS at 25 ° C., 27 parts by weight of 1,6-hexanediol diglycidyl ether, silica fine particles (Japanese) Aerosil product "RY-200S") 2
Parts by weight and 1 part by weight of a color toner (“ECB-401” manufactured by Dainippon Color Materials Co., Ltd.), and (ii) 52 parts by weight of a Mannich type curing agent containing metaxylenediamine as a base amine and polyoxypropylenediamine 3
Parts by weight were separately mixed with a mixer and left in a room at 0 ° C. for 24 hours or more. The ratio between the number of epoxy groups and the number of active hydrogens in the impregnated resin 3 obtained by mixing both was 1.0.

(12) <Impregnated Resin 4> (i) 100 parts by weight of a main component of a two-liquid room temperature drying type epoxy resin (“XL-700WR” manufactured by Mitsubishi Chemical Corporation) and (ii) two-liquid room temperature drying 50 parts by weight of a type epoxy resin curing agent (manufactured by Mitsubishi Chemical Corporation, "XL-700WH") were separately left in a room at 0 ° C for 24 hours or more, and both were mixed well immediately before use.

<Test Method>: (1) <Adhesive Strength Test Method> An adhesive strength test method was carried out in accordance with the Ministry of Construction's Building Research Institute type adhesive strength test method.
The test body was prepared by applying an adhesive to the center of a 7 cm × 7 cm test piece for an adhesive strength test and fixing an attachment (cross section: 4 cm × 4 cm) for a tensile test. And
The test specimen was set on a Kenken-type adhesion tester (manufactured by Yamamoto Hoikiki Co., Ltd.) and pulled in a direction perpendicular to the surface under an environment of 23 ° C. to cause a maximum tensile load (Kgf) when breaking.
Was read, and at the same time, the state of breakage was observed. The value obtained by dividing the read value by the area 16 (cm ² ) was used as the adhesive strength (Kgf).
/ Cm ² ). The above test was performed on each of four test specimens, and the average value was obtained.

(2) <Peeling strength test method> Shimadzu Autograph DSS-5000 at 23 ° C measurement environment
The test piece for peel strength is set horizontally, the carbon fiber sheet protruding from the test piece at the part to be adhered is grasped, and the maximum tensile load when pulling at a head speed of 20 mm / min in the direction perpendicular to the test piece surface (Kgf) was read, and the peeling state was observed at the same time. The reading is taken as the peel strength (K
gf / 5 cm). The above test was performed for each of the four bonded portions, and the average value was obtained.

(3) <CFRP Tensile Strength> A test specimen for measuring CFRP tensile strength having a length of 250 mm and a width of 12.5 mm was measured at 23 ° C. in a measuring environment at Shimadzu Autograph DS.
S-5000 was set so that the length between grips was 100 mm, and the maximum tensile load (Kgf) when pulled at a speed of 2 mm / min was read. The read value was divided by the area (mm ² ) composed of carbon fibers in the cross-sectional area of the test piece to obtain the CFRP tensile strength (Kgf / mm ² ). The above test was performed on each of seven test pieces, and the average value was obtained.

(4) <Viscosity: PS> After the target resin and the curing agent were thoroughly mixed, the viscosity was immediately measured in PS (poise) units using a B-type viscometer at 0 ° C.

(5) <Touch-hardening time test method> After the target resin composition and the hardener composition were thoroughly mixed, immediately applied to a polyethylene terephthalate film so as to have a thickness of 0.5 mm, When left at 0 ° C. and touched with a finger, the time until stickiness disappeared was measured.

(6) <Working time test method> Immediately after the target resin composition and the curing agent composition are thoroughly mixed, 100 g (150 g in the case of putty) is put in a paper cup, and 0 ° C. Set it on the thermocouple recorder installed in the environment of the environment and continuously measure its temperature,
The time (minutes) from the mixing to the time when the peak temperature was reached was read, and the value obtained by multiplying the time by 0.7 was defined as the pot life (minutes).

(7) <Applicability test method> In the case of a primer, a primer of 150 g / m ² is applied on a concrete plate placed in an environment of 0 ° C, and in the case of a putty, the primer is applied in an environment of 0 ° C. 8 on the primer layer placed on
The putty of 50 g / m ² was applied, and each was evaluated in the class of ○ △ × according to the following criteria.

[0055]

[Table 1] ○: Uniform (no coating unevenness) △: Slightly non-uniform (some coating unevenness) ×: Non-uniform (with coating unevenness)

(8) <Method of Impregnation Test> 400 g / impregnated on a concrete plate placed in an environment of 0 ° C.
The impregnating resin is applied so as to obtain m ^2, and a fiber sheet is stuck thereon, pressed with a roller and impregnated. After 20 minutes,
Based on the following criteria, it was evaluated in the class of ○ △ ×.

[0057]

[Table 2] ○: Good impregnating property (good bleeding of undercoat resin) △: Slight impregnating property (slightly poor bleeding of undercoat resin) ×: Poor impregnating property (poor bleeding of undercoat resin)

(9) <Thixotropic test method> An impregnated resin of 400 g / m ² is applied to the concrete wall surface on which the primer layer and the putty layer are formed at 0 ° C., and the carbon fiber sheet 1 is stuck thereon. Then, hold down with a roller to remove air bubbles on the back surface of the fiber sheet 1, leave the fiber sheet 1 for 20 minutes, apply 300 g / m ² of the same impregnated resin on the fiber sheet 1, and classify as ○ △ × according to the following criteria. Was evaluated.

[0059]

[Table 3] ○: No resin dripping △: Resin dripping slightly ×: Resin dripping

Example 1 (A): The above-mentioned primer 1 was applied at 150 g / m ^{2 on} the surface of the concrete plate (dimensions 30 cm × 30 cm) left in a room at 0 ° C. Cured for hours. After curing, 800 g / m ² of the above-mentioned putty 1 was applied in an environment of 0 ° C. and cured in an environment of 0 ° C. for 16 hours. Thereafter, 400 g / m ^{2 of} the impregnating resin 1 was applied, and subsequently, the fiber sheet 1 cut into a size of 30 cm × 30 cm was applied to the entire surface, and pressed with a roller to remove bubbles on the back surface of the fiber sheet 1. After standing for 1 minute, the same impregnated resin 1 was applied to the surface at 300 g / m ² , and cured for 12 days in an environment of 0 ° C. to adhere a fiber sheet. 70m from the obtained fiber sheet-coated concrete plate
Four test pieces of the adhesive strength test having a size of mx 70 mm were prepared, and an adhesive strength test was performed by the above-described adhesive strength test method. The results are shown in Table 4.

(B): In the above (A), it is assumed that a peel strength test measurement is performed, and the dimension is 40 in the fiber direction.
A fiber sheet 1 cut to 0 mm and a width of 50 mm is protruded by 100 mm so that one end in the length direction becomes a peeling port, and four sheets are provided on each side of each of the two sheets for a plurality of tests.
Except that the fibers were arranged and attached on a concrete plate so that a space of 0 mm was created, a test specimen for peeling test was prepared in which four fiber sheets 1 were attached in exactly the same manner as in (A) above.
Perform a peel strength test by the above peel strength test method,
Table 4 shows the results.

(C): The fiber sheet 1 has a size of 30 cm × 3.
After cutting to a size of 0 cm, 400 g of the impregnated resin 1 was cut from one side of the impregnated resin 1 in an environment of 0 ° C. on the cut fiber sheet.
/ M ² , 300 g / m ² from the other side, impregnated, and cured as it is at 0 ° C. for 12 days. After curing, it was cut in the fiber direction to prepare seven CFRP tensile strength measurement test pieces having a width of 12.5 mm, and a CFRP tensile strength test was performed. The results are shown in Table 4.

Example 2 In Example 1 (A), (B) and (C), primer 1, putty 1 and impregnating resin 3 were used as the primer, putty and impregnating resin, respectively. In the same manner as in the above, a test piece for an adhesive strength test, a test piece for a peel test, and a test piece for CFRP tensile strength measurement were prepared, and an adhesive strength test, a peel strength test, and a CFRP tensile strength test were performed. The results are shown in FIG.

Example 3 In Example 1 (A), (B) and (C), except that primer 2, putty 2 and impregnating resin 1 were used as the primer, putty and impregnating resin, respectively. In the same manner as in the above, a test piece for an adhesive strength test, a test piece for a peel test, and a test piece for CFRP tensile strength measurement were prepared, and an adhesive strength test, a peel strength test, and a CFRP tensile strength test were performed. The results are shown in FIG.

Example 4 In Example 1 (A), (B) and (C), primer 2, putty 2 and impregnating resin 2 were used as the primer, putty and impregnating resin, respectively. In the same manner as in the above, a test piece for an adhesive strength test, a test piece for a peel test, and a test piece for CFRP tensile strength measurement were prepared, and an adhesive strength test, a peel strength test, and a CFRP tensile strength test were performed. The results are shown in FIG.

Example 5 In Example 1 (A), (B) and (C), primer 2, putty 2 and impregnating resin 3 were used as the primer, putty and impregnating resin, respectively. In the same manner as in the above, a test piece for an adhesive strength test, a test piece for a peel test, and a test piece for CFRP tensile strength measurement were prepared, and an adhesive strength test, a peel strength test, and a CFRP tensile strength test were performed. The results are shown in FIG.

Comparative Example 1 The procedure of Example 1 was repeated except that primer 3, putty 3 and impregnating resin 4 were used as primer, putty and impregnating resin in (A), (B) and (C) of Example 1, respectively. In the same manner as in the above, a test piece for an adhesive strength test, a test piece for a peel test, and a test piece for CFRP tensile strength measurement were prepared, and an adhesive strength test, a peel strength test, and a CFRP tensile strength test were performed. The results are shown in FIG.

Additional test: The finger-curing time, the pot life and the applicability were measured for each of the above-mentioned primers and putty, and the finger-curing time, the pot time, the impregnating property and the shaking were measured for each impregnated resin. The denaturation was measured and the results are shown in Table 5.

[0069]

Table 4 Example Comparative Example 1 2 3 4 5 1 ──────────────────────────────────── <Coating amount (g / m ² ) Primer 150 150 150 150 150 150 Putty 800 800 800 800 800 800 800 Impregnated resin undercoat 400 400 400 400 400 400 400 Topcoat 300 300 300 300 300 300 300接着 Adhesive strength (Kgf / cm ² ) 30 30 30 30 30 10 10 Fracture surface C fracture C fracture C fracture C fracture C fracture P / G Peel strength (Kgf / 5 cm) 20 20 20 20 20 2 Peeled surface C destruction C destruction C destruction C destruction C destruction P / G CFRP tensile strength (Kgf / mm ² ) 380 400 380 370 400 230 230 ────

In Table 4, C destruction indicates that the concrete layer was broken, and P / G indicates that the concrete layer was separated between the primer layer and the carbon fiber sheet layer.

[0071]

[Table 5] 粘度 Viscosity Touch cure time Pot life Applyability Impregnation Thixotropic (PS) (time) (min) ──────────────────────────────────── Primer 150 1285 ○--Primer 2 75850 ○--Primer 3 100 40> 300 △--Putty 1 720 1085 ○--Putty 2 750 750 ○--Putty 3 Putty 40> 300 ×-- Impregnated resin 1 100 1280---Impregnated resin 2 130 850---Impregnated resin 3 95 1390---Impregnated resin 4 150 40> 300--- ─────────────────────── However,> 300 indicates more than 300 You.

As can be seen from the results shown in Table 4, the adhesive strength of the fiber sheet to the concrete surface was particularly low in the reinforcing method using the primer, putty and impregnated resin of the comparative example. However, in the reinforcing method using the primer, putty and the impregnated resin according to the present invention, since the reinforcing work is strong even in a low-temperature environment, the concrete is separated due to internal destruction of the concrete layer. Is happening.

[0073]

According to the present invention described above, a primer layer is formed on a reinforcing surface of a structure, and if necessary, a putty layer is formed on the primer layer. In the method of reinforcing a structure, an impregnating resin is applied before and / or after the fiber sheet is applied to the surface of the putty layer in the portion where the impregnation resin is formed, and the impregnated resin is penetrated into the voids of the fiber sheet to cure the impregnated resin. By using a specific epoxy resin composition as the above-mentioned primer, putty and impregnating resin, in winter, for example, -5 to 0 ° C
Good handleability even under low temperature conditions such as
It is possible to provide a method for reinforcing a concrete structure capable of firmly attaching a fiber sheet to a reinforcing surface, and the present invention has a large industrial value.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI // B29C 70/06 B29C 67/14 W B29K 105: 08

Claims (14)

[Claims] 1. A primer layer is formed on a reinforcing surface of a structure, a putty layer is formed on the primer layer if necessary, and then the surface of the formed primer layer (a putty layer in a portion where the putty layer is formed) is formed. In a method of reinforcing a structure in which an impregnating resin is applied before and / or after the fiber sheet is applied and penetrated into voids of the fiber sheet to cure the impregnated resin, the above-mentioned primer, putty and impregnating resin ,
(1) 60 to 85% by weight of an epoxy resin having a viscosity of 150 PS or less at 25 ° C. 15 to 40% by weight of diglycidyl ether of a dihydric alcohol, and an acrylic oligomer 0
(2) a curing agent composition containing 60 to 100% by weight of a Mannich type curing agent and 0 to 40% by weight of an aliphatic polyether diamine; (3) adjusting the ratio of the number of active hydrogens in the curing agent composition to the number of functional groups in the resin composition in the range of 1: 0.85 to 1: 1.2 A method for reinforcing a structure, comprising: 2. A bisphenol F epoxy resin having a resin composition of 40 PS or less (viscosity at 25 ° C.).
The reinforcing method according to claim 1, comprising 5% by weight, 25 to 30% by weight of 1,6-hexanediol diglycidyl ether, and 0 to 5 parts by weight of a thixotropic agent. 3. A bisphenol F epoxy resin having a resin composition of 40 PS or less (viscosity at 25 ° C.).
The reinforcing method according to claim 1, comprising 5% by weight, 15 to 20% by weight of 1,6-hexanediol diglycidyl ether, 5 to 10% by weight of an acrylic oligomer and 0 to 5 parts by weight of a thixotropic agent. 4. A mixture comprising 100 parts by weight of the mixture according to claim 1 and 0 to 3 parts by weight of a coupling agent as a primer, and 100 parts by weight of a mixture according to claim 1 as a putty and 50 to 150 parts by weight of a filler. And 100 parts by weight of the mixture according to claim 1 and a coloring agent 0 as an impregnating resin.
2. The method according to claim 1, wherein a mixture with 3 parts by weight is used. 5. The reinforcing method according to claim 1, wherein the thixotropic agent in the resin composition is finely divided silica. 6. The reinforcing method according to claim 1, wherein a main component of the Mannich type curing agent is meta-xylene diamine. 7. The fiber sheet according to claim 1, wherein the fiber sheet is a carbon fiber sheet, an aramid fiber sheet or a glass fiber sheet.
The reinforcement method according to any one of the above. 8. The reinforcing method according to claim 1, wherein the fiber sheet is a carbon fiber sheet. 9. The fiber weight of the fiber sheet is 200 g / m ^2.
9. The reinforcing method according to claim 1, wherein the amount of the impregnated resin is 15% by weight or less. 10. A primer having a viscosity at 0 ° C. of 10
0 PS or less, and the viscosity at 0 ° C. of the impregnated resin is 15
The reinforcing method according to any one of claims 1 to 9, which is 0 PS or less. 11. The reinforcing method according to claim 1, wherein the structure is a concrete structure. 12. The reinforcing method according to claim 1, wherein the reinforcing treatment is performed at 5 ° C. or lower. 13. The reinforcing method according to claim 1, wherein the reinforcing treatment is performed at 5 ° C. or less, and the adhesive strength between the fiber sheet and the concrete surface after 2 weeks is 15 kg / cm ² or more. 14. A reinforcing treatment is performed at 5 ° C. or less, and after 2 weeks, the fiber sheet layer has a tensile strength of 350 kg / g.
The method of reinforcing a part recited in any of claims 1 to 13 mm ² or more.