JP2001227174A - Laminated structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated structure higher in reinforcing effect than a conventionally reinforced concrete structure and superior in mechanical properties such as bending strength. SOLUTION: In the laminated structure laminating and integrating a reinforcing layer 2 comprising a reinforced fiber such as norbornene-based resin and carbon fiber being preferably dicyclopentadiene polymer in the concrete structure 1, in the case that the reinforcing layer 2 is laminated and integrated on one face of the flat plate-like concrete structure, and in the case that the reinforcing layer 2 is laminated and integrated on the whole side peripheral face of the circular column-like concrete structure 1, three layers of the flat plate-like concrete structures 1, 1 are integrated by two layers of the reinforcing layers 2, 2, and in the case that the reinforcing layer 2 is laminated and integrated on the surface of the upper flat plate-like concrete structure 1 and the laminated structure is constituted, the case and the like that the reinforcing layer 2 is laminated and integrated so as to be buried in the inside of the concrete structure 1 exist.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete laminated structure excellent in reinforcing effect.

[0002]

2. Description of the Related Art Conventionally, as a method of reinforcing a concrete structure such as a bridge or a highway pier, a method of laminating a fiber reinforced plastic (FRP) layer on a concrete structure to be reinforced or repaired has been known. I have. Specifically, for example, a method has been proposed in which an epoxy resin is used as a plastic and carbon fibers or glass fibers are used as reinforcing fibers (see Japanese Patent Application Laid-Open No. 9-228322). However, in general, when tensile or compressive strain is applied to a concrete structure having a laminated reinforcing layer as described above due to bending deformation or the like, cracks are first generated in the concrete, and a large stress is applied to the reinforcing layer in contact with the crack. Concentration occurs. In this case, the reinforcing layer formed by laminating and integrating the epoxy resin with the concrete structure together with the reinforcing fiber causes a fracture with a stress lower than expected due to the high brittleness of the epoxy resin, and a sufficient There was a problem that a reinforcing effect could not be obtained.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the above-mentioned conventional reinforced concrete structures.
An object of the present invention is to provide a laminated structure having a higher reinforcing effect and excellent mechanical properties such as bending strength.

[0004]

In order to achieve the above object, according to the present invention, there is provided a laminate comprising a concrete structure and a reinforcing layer comprising a norbornene resin and a reinforcing fiber integrally laminated. Provide a structure. Claim 2
The present invention described above provides the laminated structure according to claim 1, wherein the norbornene-based resin is a polymer of dicyclopentadiene.

According to a third aspect of the present invention, there is provided the laminated structure according to the first or second aspect, wherein the reinforcing fiber is at least one of carbon fiber, glass fiber, and aramid fiber. According to a fourth aspect of the present invention, there is provided the laminated structure according to any one of the first to third aspects, wherein a reinforcing layer is integrally laminated on the concrete-based structure via a primer layer.

Hereinafter, the present invention will be described in more detail. The concrete-based structure in the laminated structure of the present invention is a concrete hardened body obtained by hydrating an inorganic component such as cement and aggregate with water and hardening, and reinforced by a reinforcing material such as a reinforcing bar as necessary. However, the present invention is not limited to this, and may be a hardened body made of tile, resin concrete, mortar, cement, or the like. The shape of the concrete structure to be reinforced is not particularly limited, and any shape such as a flat plate, a column, a prism, and a pipe can be used, and the laminated structure is not particularly limited.

The types of reinforcing fibers used in the reinforcing layer include inorganic fibers, organic fibers, metal fibers, and the like. Preferred examples thereof include carbon fibers, glass fibers, aramid fibers, polyethylene terephthalate fibers, and steel. Fiber and the like. These fibers may be used alone,
Two or more kinds may be used in combination. The form of the reinforcing fiber may be a filament-like long fiber or a short fiber, and these fibers may be processed into a cloth, a sheet, a mat, a nonwoven fabric, or the like. Also,
These may be used in combination.

FIG. 1A showing an example of a laminated structure of the present invention.
In FIG. 1, a reinforcing layer 2 made of a norbornene-based resin and a reinforcing fiber is laminated and integrated on one side of a plate-shaped concrete-based structure 1, and in FIG. The reinforcement layer 2 is laminated and integrated on the entire peripheral surface of. Further, in FIG. 1 (c), three layers of the plate-like concrete structure 1, 1, 1 are integrated by two layers of reinforcement layers 2, 2, and the upper plate-like concrete structure 1, A reinforcing layer 2 is laminated and integrated on the surface to form a laminated structure. In FIG. 1D, the reinforcing layer 2 is laminated and integrated such that the reinforcing layer 2 is embedded in the concrete structure 1. .

The content and form of the reinforcing fiber in the reinforcing layer and the thickness of the reinforcing fiber layer are not particularly limited, and may be suitably adjusted depending on the intended use within a range in which the mechanical properties, handleability and workability are good. .

The method for obtaining the laminated structure of the present invention is not particularly limited, and the method for laminating the reinforcing layer on the concrete-based structure includes: (1) installing a reinforcing fiber on the surface of the concrete-based structure; A method of applying norbornene-based monomers by a suitable coating and impregnating means such as a roller, a brush, spraying, etc. and applying the same to a concrete-based structure while impregnating the reinforcing fibers, and then polymerizing and curing the norbornene-based monomers for lamination and integration. (2) a method of applying a norbornene-based monomer to the surface of a concrete-based structure, then attaching a reinforcing fiber, polymerizing and curing the norbornene-based monomer to laminate and integrate, and (3) dispersing short fibers in advance. After applying or spreading the norbornene monomer on the surface of the concrete structure, the norbornene monomer is polymerized and cured. Method (4): A laminate structure in which a concrete composition before curing is poured around a composite comprising a norbornene-based resin and a reinforcing fiber, and then the concrete is cured, whereby a reinforcing layer is laminated and integrated with the concrete-based structure. Examples of a method for forming a body include, but are not limited to, of course.

The reinforcing layer of the laminated structure of the present invention is formed by polymerizing and curing norbornene-based monomers as described above. Hereinafter, a method of polymerizing and curing norbornene-based monomers, a composition upon polymerization, etc. Will be described. The norbornene-based resin used for the reinforcing layer is obtained by subjecting a norbornene-based monomer to metathesis polymerization. Examples of the norbornene-based monomer include bicyclic compounds such as norbornene and norbornadiene, tricyclic compounds such as dicyclopentadiene and dihydrodicyclopentadiene, tetracyclododecene, ethylidenetetracyclododecene,
Tetracyclics such as phenyltetracyclododecene, pentacyclics such as tricyclopentadiene, heptacyclics such as tetracyclopentadiene, and alkyl-substituted products thereof (for example, methyl, ethyl, propyl, butyl-substituted and the like),
Not only alkylidene-substituted (eg, ethylidene-substituted) and aryl-substituted (eg, phenyl-, tolyl-substituted) but also epoxy group, methacrylic group, hydroxyl group, amino group, carboxyl group, cyano group, halogen group, ether group And derivatives having a polar group such as an ester bond-containing group. These may be used alone or 2
A mixture of more than one species may be used. Further, a cycloolefin such as cyclobutene, cyclopentene, cyclopentadiene, cyclooctene, cyclododecene, or indene, which is capable of metathesis polymerization, may be used together with at least one kind of the norbornene-based monomers as long as the effects of the present invention are not impaired. .

The norbornene-based resin used in the laminated structure of the present invention is preferably prepared from the viewpoint of monomer reactivity, availability, polymer physical property balance, price, etc., from the viewpoint of the weight of dicyclopentadiene. It is preferred that they are united. A molded article made of a polymer of dicyclopentadiene has very excellent characteristics, particularly in terms of impact resistance and heat resistance.

The norbornene-based monomer can be polymerized using a known metathesis polymerization catalyst. Specific examples include halides such as tungsten, molybdenum, tantalum, ruthenium, rhenium, osmium, and titanium, oxyhalides, oxides, and organic ammonium salts.

When it is necessary to carry out the polymerization in the air in the molding process, a ruthenium carbene complex represented by the following general formula (I) or a ruthenium vinylidene complex represented by the following general formula (II) is preferred.

[0015]

Embedded image

Wherein R ₁ and R ₂ are independently of each other:
Hydrogen, C2 -C20 -alkenyl, C1 -C20 -alkyl, aryl, C1 -C20 -carboxylate, C
C1 -C20 -alkoxy, C2 -C20 -alkenyloxy, aryloxy, C2 -C20 -alkoxycarbonyl, or C1 -C20 -alkylthio (which are C1 -C5 -alkyl, halogen, C1 -C5 −
X ₁ and X ₂ may be substituted by an alkoxy group or may be substituted by a C 1 -C 5 -alkyl group, halogen, or a phenyl group substituted by a C 1 -C 5 -alkoxy group. , Independently of one another, represent any anionic ligand, L ₁ and L
₂ independently represent any neutral electron donor;
Two or three of ₁ , X ₂ , L ₁ and L ₂ may together form a polydentate chelating ligand)

Embedded image Wherein R ₃ and R ₄ are independently hydrogen, C 2-
C20 -alkenyl, C1 -C20 -alkyl, aryl, C1 -C20 -carboxylate, C1 -C20 -alkoxy, C2 -C20 -alkenyloxy, aryloxy, C2 -C20 -alkoxycarbonyl, C1
To C20 -alkylthio groups (these may be substituted by C1 -C5 -alkyl groups, halogen, C1 -C5 -alkoxy groups or by C1 -C5 -alkyl groups, halogen, C1 -C5 -alkoxy groups) X ₃ and X ₄ may be substituted by a substituted phenyl group) or a ferrocene derivative,
L ₃ and L ₄ independently of one another represent any anionic ligand; L ₃ and L ₄ independently represent any neutral electron donor; of X ₃ , X ₄ , L ₃ and L ₄ , Or three together may form a polydentate chelating ligand)

The ruthenium represented by the above general formula (I)
Preferred carbene complexes are as follows.
That is, in the formula, R1 and R2 independently represent hydrogen, C2 -C5 -alkenyl, C1 -C5 -alkyl, phenyl, C1 -C5 -carboxylate, C1
-C5 -alkoxy, phenoxy or C2 -C5
-Alkoxycarbonyl groups (which may be substituted by C1 -C5 -alkyl groups, halogen, C1 -C5 -alkoxy groups, or substituted by C1 -C5 -alkyl groups, halogen, C1 -C5 -alkoxy groups) X1 and X2 independently of each other may be C1, B
r, C1 -C5 -carboxylate, C1 -C5 -alkoxy, phenoxy or C1 -C5 -alkylthio (which are C1 -C5 -alkyl, halogen,
It may be substituted by a C1 -C5 -alkoxy group, or may be a C1 -C5 -alkyl group, a halogen,
Which may be substituted by a phenyl group substituted by a 1-C5 -alkoxy group), and wherein L1 and L2 independently of one another are an aryl group or a C1 -C10- Alkyl phosphine groups (these are C 1 -C 5 -alkyl groups, halogens, C
It may be substituted by a 1-C5-alkoxy group, or may be a C1-C5-alkyl group, halogen, C1
A ruthenium-carbene complex which is a neutral ligand from the group consisting of -C5 -optionally substituted by a phenyl group substituted by an alkoxy group. Among the ruthenium vinylidene complexes represented by the above general formula (II), preferred complexes are as follows. That is, in the formula, R3
And R4 independently of one another are hydrogen, methyl, ethyl, phenyl, ferrocenyl or vinyl optionally substituted by methyl, ethyl, phenyl or ferrocenyl, X3 and X4 Is
Preferred is a ruthenium vinylidene complex wherein Cl and Br are independently of each other and L3 and L4 are independently a trimethylphosphine, triethylphosphine, triphenylphosphine or tricyclohexylphosphine group.

The ruthenium carbene complex of the general formula (I) and the ruthenium vinylidene complex of the general formula (II) can be used by directly dissolving them in a norbornene-based monomer. Is preferably liquidized in advance in order to uniformly disperse it in the norbornene-type monomer. For example, the solvent is preferably used after being diluted with a solvent, and examples of the solvent include toluene, benzene, tetrahydrofuran (THF), and dichloromethane. It is not preferable to dissolve the complex in a solvent or an acid containing active hydrogen, since this impairs the stability of the complex.

When a ruthenium carbene complex of the above general formula (I) or a ruthenium vinylidene complex of the general formula (II) is used as the polymerization catalyst, the reason is not clear by using a tertiary heterocyclic amine, The polymerization activity can be lowered to delay the polymerization.

The tertiary heterocyclic amine is not particularly limited, and may be a saturated compound or an unsaturated compound, and may be an aliphatic compound, an aromatic compound or a heterocyclic compound. There may be. Further, the number of nitrogen atoms constituting the ring is not limited, and the ring may be shared with another kind of hetero atom. Further, a derivative derived from such a tertiary heterocyclic amine may be used. The tertiary heterocyclic amine may be in a solid, liquid, or gaseous state within the handling temperature range, but is preferably in a liquid form in consideration of uniform dispersibility in the reactive composition.

The solid tertiary heterocyclic amine is preferably made into a liquid beforehand in order to uniformly disperse it in the reactive composition. That is, it is preferable to use the tertiary heterocyclic amine diluted with a solvent, for example. As toluene, benzene,
Examples include tetrahydrofuran, methanol, and isopropyl alcohol. Examples of such tertiary heterocyclic amines include pyridine, γ-cyanopyridine, γ-picoline, pyrazine, piperazine, piperidine, pyrrolidine, 1,3,5-triazine, imidazole and 2-aminothiazole. No. These tertiary heterocyclic amines may be used alone or in combination of two or more.

The method of mixing the tertiary heterocyclic amine is not particularly limited. When the norbornene-based monomer and the ruthenium carbene complex of the general formula (I) or the ruthenium vinylidene complex of the general formula (II) are mixed, at least one of them is used in advance. The tertiary heterocyclic amine may be mixed, or the tertiary heterocyclic amine may be mixed at the same time as the mixing. After the mixing, the tertiary heterocyclic amine can be mixed.

The third compound for the ruthenium carbene complex of the general formula (I) or the ruthenium vinylidene complex of the general formula (II)
The mixing ratio of the lower heterocyclic amine is preferably in the range of 10,000 to 1/100 mol. More preferably, 1000 to 1 /
It is in the range of 10 moles. However, the mixing ratio of the tertiary heterocyclic amine to the norbornene-based monomer is from 1/1/1.
The range is preferably 100,000 moles, more preferably 1 mole.
/ 2 to 1 / 50,000 mol. Here, the third
If the mixed amount of the tertiary heterocyclic amine is too large, the metathesis reaction does not proceed sufficiently, and a molded product having good physical properties may not be obtained. If too long, a sufficient delay effect cannot be obtained.

The amount of the polymerization catalyst depends on the activity of the catalyst.
A range of 0,000,000 moles is preferred. More preferably,
It is in the range of 1/1000 to 1/100000 mol.

The reinforcing fiber used for the reinforcing layer can be used as a fiber / resin composite material which has been impregnated with a norbornene-based resin or epoxy resin as a matrix in advance and molded into a predetermined shape. The composite material
It is preferable to use a norbornene-based resin as the matrix from the viewpoint of mechanical properties. The reinforcing fibers may be subjected to a surface treatment or the like showing good adhesiveness with a resin serving as a matrix, depending on the type thereof, but when the matrix is a norbornene-based resin composition and the reinforcing fibers are carbon fibers, The surface of the carbon fiber is preferably untreated. The fiber content of the fiber / resin composite material is not particularly limited.

The norbornene resin used in the present invention may be filled with an aggregate. Aggregates include inorganic aggregates containing silica, mica, alumina, magnesium oxide, calcium carbonate, aluminum hydroxide, etc. as main components, organic aggregates such as polyethylene, polyvinyl chloride, polyvinyl fluoride, glass balloons, silica balloons. And inorganic or organic hollow bodies such as alumina balloons, phenol balloons, and vinylidene chloride balloons, and these may be metal-plated or surface-treated or coated with organic or inorganic substances.

In forming the reinforcing layer of the laminated structure of the present invention, a norbornene-based monomer is used.
This monomer may contain a solvent. Examples of the solvent include aromatic hydrocarbons, aliphatic hydrocarbons, chlorinated hydrocarbons, ethers, alcohols, water, and mixtures thereof. Further, the molecular weight and reaction rate can be adjusted by adding a chain transfer agent. Examples of the chain transfer agent include compounds having a carbon-carbon double bond, specifically, C1-C12 alkenes, allyl ethers, alkyl allyl ethers, styrene, and the like.

The viscosity can be adjusted by using a viscosity modifier. Examples of the viscosity modifier include polybutadiene and polyisoprene having an olefinically unsaturated group, and such a viscosity modifier can be incorporated into a polymer during metathesis polymerization. The content of the viscosity modifier is preferably in the range of 0.1 to 50% by weight, more preferably in the range of 0.1 to 20% by weight, based on the total amount of the polymerizable monomer.

Also, defoaming agents, defoaming agents, dispersants, thixotropic agents, antioxidants, antistatic agents, light stabilizers, coloring agents, molecular weight regulators, polymer modifiers, flame retardants, lubrication Agent, release agent,
Various additives such as a surfactant may be added to the norbornene-based resin for forming the reinforcing layer of the present invention.

Further, if necessary, another thermoplastic resin or adhesive resin may be blended. Such resins include natural rubber, polybutadiene, polyisoprene, styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer, EPD
M, ethylene-vinyl acetate copolymer and hydrogenated products thereof are mentioned as examples.

The usable temperature range of the norbornene resin used in the present invention is from -30 ° C to 160 ° C, preferably-
20 ° C to 100 ° C.

The laminated structure according to the second aspect of the present invention is the same as the first aspect, except that the norbornene-based resin composition contains dicyclopentadiene. It can be said that dicyclopentadiene is preferable among norbornene-based resins in terms of price, reactivity, physical properties, and availability. In addition, the molded article of dicyclopentadiene has very excellent properties, particularly in terms of impact resistance and heat resistance.

The dicyclopentadiene monomer has a melting point of 3
It is 3.6 ° C. and is solid at room temperature, but can be handled as liquid at room temperature by adding other norbornene-based monomers. The norbornene-based monomer to be added to dicyclopentadiene is preferably one that does not reduce the physical properties of the molded article of dicyclopentadiene even when added. Specific examples include ethylidene norbornene, methylcyclopentadiene, cyclopentadiene, and tricyclopentadiene. It is. Such norbornene-based monomers added to dicyclopentadiene may be used alone or in combination of two or more. The addition amount is preferably 2 parts by weight to 90 parts by weight, more preferably 5 parts by weight to 50 parts by weight, based on 100 parts by weight of dicyclopentadiene.

[0034] The laminated structure according to the present invention according to claim 3 is the same as the laminated structure according to claim 1 or 2, except that the reinforcing fiber is at least one of carbon fiber, glass fiber and aramid fiber. Is the same. It can be said that these fibers are the most preferable reinforcing fibers in terms of strength, elastic modulus, durability, lightness and the like.

The laminated structure according to the present invention according to claim 4 is the same as the laminated structure according to any one of claims 1 to 3, except that the reinforcing layer is laminated and integrated with the concrete structure via a primer layer. Is the same. Since the concrete surface has a highly polar structure due to hydration water and hydroxyl groups,
In order that the reinforcing layer composed of the norbornene-based resin and the reinforcing fiber is well bonded to concrete and the effect of the present invention is improved, the norbornene-based resin used has a polar group or contains another polar component. However, when a low-polarity norbornene-based resin composition is used, the concrete-based structure and the reinforcing layer are firmly integrated by providing a primer layer on the surface of the concrete-based structure in advance. It is.

The primer to be used may be any as long as it has good adhesion to both the concrete structure and the norbornene resin composition. Particularly preferred is a urethane, polyester, methacrylate or epoxy primer. It is. Such a primer may have a multilayer structure as necessary. The coating thickness and the like are appropriately selected as needed.

(Function) In the present invention, when reinforcing a concrete structure, a concrete laminate having a reinforcing effect obtained by laminating and integrating a reinforcement layer comprising a norbornene resin composition and a reinforcing fiber with the concrete structure is integrated. It is about a structure. Since the norbornene-based resin composition is a material having low brittleness and good impact resistance, it can provide a laminated structure excellent in reinforcing effect. In addition, since the curability is good even without heat treatment at a high temperature, there is no need for long-term curing, and a laminated structure can be provided in a short time.

[0038]

EXAMPLES (Example 1) Monomer: dicyclopentadiene ethylidene norbornene metathesis reaction catalyst: bis (tricyclohexylphosphine) benzylidene ruthenium dichloride Formula (II)
Indicated by I).

[0039]

Embedded image

In the formula, Cy represents a cyclohexyl group. Non-polar solvent: toluene Reinforcing fiber: sheet-like unidirectional carbon fiber (Toray M5
0J, tensile modulus 480GPa, yarn weight 300g / m2
) Concrete structure: length 3200mm, width 300m
m, a piece of concrete with a reinforcing bar having a thickness of 400 mm was used as a sample.

As the norbornene-based monomer, a mixture of a dicyclopentadiene monomer and an ethylidene norbornene monomer at a molar ratio of 9: 1 was used. Next, a solution prepared by dissolving 10 parts of bis (tricyclohexylphosphine) benzylidene ruthenium dichloride in 200 parts of toluene was adjusted so that the molar ratio of bis (tricyclohexylphosphine) benzylidene ruthenium dichloride to the norbornene-based monomer mixture was 1/10000. The mixture was added and stirred to prepare a reactive compounding liquid of a norbornene-based monomer.

Next, as shown in FIG. 2, the surface of the concrete-type structure (3) in which the reinforcing bar (5) is arranged on the concrete (4) is subjected to a sanding treatment, and FIG.
As shown in the figure, two unidirectional carbon fiber sheets (7) are stacked and placed so that the fiber axis is parallel to the longitudinal direction over the entire length of the concrete structure (3). Is applied to a carbon fiber sheet (7) and impregnated with a roller, while a reinforcing layer (2) comprising the carbon fiber sheet (7)
Was formed and simultaneously laminated and integrated with the concrete structure (3). Thereafter, the resin was cured by leaving it at room temperature for 60 minutes to obtain a test piece (6). Environmental temperature during operation is 24
° C. Next, as shown in FIG.
Fulcrum (9), whose distance L1 is 2500 mm apart from each other,
A four-point bending test was performed by applying a compressive load using compression jigs (10) and (10) supported by (9) and spaced from each other by 300 mm. The test was performed by arranging the test pieces so that the reinforcing layer was on the tensile side as shown in FIG. 3, and the number of test pieces was three. The results are shown in Table 1.

Example 2 As shown in FIG. 4B, a two-component methacrylate resin-based primer (8) was applied to the surface of a concrete-based structure (3) which had been sanded in advance, and left for 60 minutes. And cured. The primer (8) has a tensile shear adhesive strength to vinyl chloride resin of about 8 to 10 MPa and an elongation of 50 to 75%.
Was used. Except for this, in the same manner as in Example 1, the reinforcement layer (2) was formed and simultaneously laminated and integrated with the concrete-based structure via the primer layer (8), and a four-point bending test was performed. The results are shown in Table 1.

Comparative Example 1 A four-point bending test was performed using an unreinforced concrete structure (3) as a comparative test piece. Table 1 shows the results. (Comparative Example 2) Epoxy resin base material: Epicoat 828 (manufactured by Yuka Shell Epoxy Co., Ltd.) Curing agent: triethyltetramine Reinforcing fiber: sheet-like unidirectional carbon fiber (Toray M5)
0J, tensile modulus 480GPa, yarn weight 300g / m2
) Concrete structure: length 3200mm, width 300m
m, a piece of concrete with a reinforcing bar having a thickness of 400 mm was used as a sample.

The weight ratio of the epoxy resin base material and the curing agent is 10:
Using the mixture obtained in Step 1, two unidirectional carbon fiber sheets were stacked on a concrete structure whose surface was sanded in advance, and placed so that the fiber axis became parallel to the longitudinal direction of the concrete structure structure. Thereafter, the above-mentioned epoxy resin compounding liquid was applied and was integrated with a concrete member while being impregnated with a roller. Thereafter, the resin was cured by leaving it at room temperature for 60 minutes or 72 hours to obtain test pieces. The ambient temperature during the operation was 24 ° C. Table 1 shows the results of the four-point bending test.
It was shown to.

As described above, according to the present invention, the laminated structure obtained by laminating and integrating the norbornene-based resin composition and the reinforcing fiber on the concrete surface has a significantly higher bending strength than the unreinforced one. Improved. Flexural strength was increased by about 55% without primer and by about 80% with primer applied. On the other hand, those in which reinforcing fibers are laminated and integrated on the concrete surface with epoxy resin, those cured for 60 minutes have almost no reinforcing effect.
In the case of the time-cured steel, the bending strength was improved by about 45% as compared with the unreinforced steel, but the elongation at break was greatly reduced.

[0047]

[Table 1]

[0048]

According to the laminated structure of the present invention, a reinforcing layer made of a norbornene resin and a reinforcing fiber is integrally laminated on a concrete structure, so that a conventional reinforcing method using an epoxy resin or the like as the reinforcing layer is used. Compared with concrete-based structures, it has a higher reinforcing effect and excellent mechanical properties such as bending strength.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an example of an embodiment of a laminated structure of the present invention.

FIG. 2 is a schematic sectional view showing another example of the embodiment of the laminated structure of the present invention.

FIG. 3 is an explanatory view of a bending strength test of the laminated structure of the present invention.

FIG. 4 is a schematic cross-sectional view showing an example of an embodiment of the laminated structure of the present invention.

[Explanation of symbols]

 1. Concrete structure 2. Reinforcement layer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) // E01D 21/00 E01D 21/00 F term (reference) 2D059 AA03 GG01 GG02 GG40 2E176 AA01 BB29 4F100 AD11B AE01A AG00B AK08B AK47B BA02 DG01B DH01B EJ65A EJ82B GB07 GB90 JK01 JK04

Claims (4)

[Claims] 1. A laminated structure in which a reinforcing layer made of a norbornene-based resin and a reinforcing fiber is laminated and integrated on a concrete-based structure. 2. The laminated structure according to claim 1, wherein the norbornene resin is a polymer of dicyclopentadiene. 3. The laminated structure according to claim 1, wherein the reinforcing fibers are at least one of carbon fibers, glass fibers, and aramid fibers. 4. The laminated structure according to claim 1, wherein a reinforcing layer is laminated and integrated on the concrete structure via a primer layer.