JPH07286408A - Reinforcing material made of fiber-reinforced resin - Google Patents

Abstract

PURPOSE:To secure tensile strength and bond strength to concrete reinforced by reinforcing material made of a fiber-reinforced resin by covering the surface of a wire body, made of a fiber-reinforced resin, with organic fiber bundles by braiding, and setting a specific surface anchor coefficient. CONSTITUTION:A wire body l is formed fiber-reinforced resin constituted of continuous fiber and base material resin, and surface material 2 is formed around the wire body 1 to obtain a reinforcing material made of fiber-reinforced resin. Carbon fiber is used as high strength fiber because of having high alkali resistance and heightening the modulus of elasticity, while thermosetting resin with low alkali resistance such as epoxy resin is used as base material resin, and a surface anchor coefficient is set to 0. 4 to 1.0, that is, SC=T/Y=(h/D)/(YCXYL), where SC: a surface anchor coefficient, T: a protrusion ratio, Y: the covering rate of organic fiber bundle, h: the top part average height of organic fiber bundle, D: the corresponding diameter of the filament body, YC: the ratio of fiber bundle contact length to the cross-sectional peripheral length of the filament body, and YL: the ratio of contact length of the fiber bundle to the longitudinal section extension of the filament body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber-reinforced resin reinforcing material used for reinforcing concrete or the like.

[0002]

2. Description of the Related Art Reinforcing bars have been widely used as a reinforcing reinforcing material for cement, mortar, concrete, etc. (hereinafter, concrete, etc.), but in recent years, various fibers have been demanded due to requirements such as weight reduction and corrosion resistance. Reinforcement resin (FRP) reinforcements have been developed.

These include reinforcing fibers such as carbon fibers, aramid fibers, glass fibers and vinylon fibers, thermosetting resins such as epoxy resins and unsaturated polyester resins, and thermoplastic resins such as polyphenylene sulfide (PPS) as base materials. It was hardened as.

In order to reinforce concrete or the like with these fiber-reinforced resin reinforcements, it is necessary that the adhesion strength between the reinforcement and the concrete or the like is good.

For that purpose, it is usual to improve the mechanical coupling force by providing unevenness to the reinforcing material.

As a method therefor, there are a method of making unevenness on the resin-made reinforcing material itself, and a method of providing a surface material on the surface of the resin-made reinforcing material to make unevenness.

As a method of making unevenness on the resin-made reinforcing material itself, a method of flattening a part of the resin-made reinforcing material as disclosed in JP-A-63-206548, or JP-A-2 / 1999.
-92624 and Japanese Patent Application Laid-Open No. 2-92626, a method of providing a convex portion on a resin reinforcing material, and a cross-sectional shape other than a perfect circle as disclosed in Japanese Patent Application Laid-Open No. 1-192946. Various methods have been proposed, such as a method of twisting a rod having a rod and a method of using a braid as disclosed in JP-A-2-105830.

However, in each of the above-mentioned methods, an additional manufacturing step is required, manufacturing becomes difficult, and the reinforcing fibers are not oriented in a strengthening direction due to waviness and the like, so that the strength of the resin-made reinforcing material itself is lowered. There is a big drawback.

Therefore, from the viewpoint of the strength of the fiber-reinforced resin reinforcing material, the method of attaching the surface material to the surface of the FRP is excellent, and specific methods thereof are disclosed in JP-A-60-203761 and JP-A-01- A method of depositing an inorganic powder or granular material as disclosed in Japanese Patent No. 174533 and a method of adhering particles to the surface of a muscular material have been proposed.

However, in the above method, since the hard particles are directly attached to the reinforcing fibers of the muscle material, the reinforcing fibers themselves may be damaged by the contact between the muscle materials during transportation or construction of the muscle material, or the particles themselves may be peeled off. There are drawbacks such as reduced adhesion to concrete.

There has been proposed a method of spirally winding a polyester organic fiber or organic fiber woven cloth on the surface as disclosed in JP-A-02-127583.

However, in the above method, since there is no entanglement between the wound fibers or the woven cloth, high adhesive strength cannot be exhibited, and a part of the fibers or the woven cloth is immediately peeled off, so that the whole fibers or the woven cloth is peeled off. Connection is not preferable.

JP-A-63-75194, JP-A-0
A method of braiding organic fibers on the surface of a reinforcing material as disclosed in Japanese Patent Laid-Open No. 2-104786 has been proposed.

However, in each of the above-mentioned methods, the fibers used in the braid have different heat shrinkage rates, so that the coated fibers having no shrinkage effect float from the surface of the muscular material, resulting in insufficient adhesion and high adhesion strength with concrete. Can't get

Further, there is a problem in that the braiding density of the organic fibers is too high and the surface of the reinforcing material is entirely flat, so that the anchor effect with concrete is small.

[0016]

DISCLOSURE OF THE INVENTION It is an object of the present invention to provide a fiber-reinforced resin reinforcement having good tensile strength and excellent adhesion strength to concrete or the like reinforced with the fiber-reinforced resin reinforcement. To do.

[0017]

DISCLOSURE OF THE INVENTION The present invention relates to a linear member made of fiber reinforced resin and a braided material having a surface braided with a surface material made of an organic fiber bundle.
A fiber-reinforced resin reinforcing material having a surface anchor coefficient represented by a formula of 0.4 or more and 1.0 or less.

[0018]

## EQU2 ## SC = T / Y = (h / D) / (YC × YL) (1)

However, SC: surface anchor coefficient T: protrusion ratio Y: coverage of the organic fiber bundle which is the surface material on the surface of the filaments h: organic fiber bundle which is the surface material braided on the surface of the filaments Average height of the top D: Equivalent diameter of the filament (for example, the value obtained by dividing the circumferential length by π) YC: Ratio of the contact length of the fiber bundle to the transverse cross section of the filament YL: Longitudinal section of the filament Ratio of contact length of fiber bundle to extension

The contents of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a cross-sectional view of the fiber-reinforced resin reinforced material of the present invention, and FIG. 2 is a side view of the fiber-reinforced resin reinforced material of the present invention.

1 and 2, a filament 1 is an FRP composed of continuous fibers and a matrix resin.
The surface material 2 is formed around and becomes a fiber-reinforced resin reinforced material.

The high-strength continuous fibers constituting the filament 1 have a strength necessary for being used as a reinforcing material for concrete or the like, and preferably have a tensile strength of 50 kgf / mm ² or more.

Examples of such high-strength continuous fibers include carbon fibers, aramid fibers, glass fibers and polyarylate fibers.

Among these, the polyarylate fiber is a liquid crystalline aromatic polyester fiber, and corresponds to Vectran (trade name) manufactured by Kuraray Co., Ltd.

In this case, one kind of the above fibers or a plurality of kinds of fibers may be used.

Among the above-mentioned fibers, carbon fiber is particularly preferable because it can be manufactured to have a high alkali resistance and a high elastic modulus.

A thermosetting resin is used as the base material resin. As the thermosetting resin used as the base material resin, epoxy resin, unsaturated polyester resin, polyimide resin,
Examples include bismaleimide / triazine resins. Other materials can be used as long as they are used for FRP.

The resin used as the base material is particularly preferably one having high alkali resistance such as epoxy resin.

V of the linear body which constitutes the fiber-reinforced resin reinforcement
It is preferable that f (volume content of fiber) is 40% or more and 75% or less. That is, if it is less than 40%, the performance is low for use as a reinforcing material, and if it exceeds 75%, it is difficult to manufacture.

The size of the fiber-reinforced resin reinforcing material is not particularly limited, but in practice, for example, in the case of a circular cross section, a diameter of 1 mm or more and 50 mm or less is used.

The surface material 2 is coated on the surface of the filament 1 by a braiding method. The surface material 2 is polypropylene fiber,
Organic fiber bundles such as polyester fibers, aramid fibers, and acrylic fibers are used. The organic fiber bundle can be used in the form of either filament yarn or spun yarn.

The organic fiber bundle may be selected in consideration of heat treatment conditions of the resin, mechanical strength, price and the like. Among them, spun yarn is preferable because it has high adhesion strength with concrete or the like.

Although the detailed reason for this is not clear, it is considered that the surface properties of the reinforced material when spun yarn is used give particularly favorable results for improving the bond strength.

It is preferable that the organic fiber bundle used for coating the surface of the filament has a heat shrinkage rate of 5% or more under the curing heat treatment condition of the resin.

That is, by using an organic fiber bundle having a heat shrinkage ratio of 5% or more, the organic fiber bundle undergoes heat shrinkage during thermosetting of the resin in the filamentous body, and pressure is applied to the filamentous body. At the same time as making the fiber bundles in the body tight, the surface material 2 and the filamentous body 1 can be integrated by allowing resin to exude onto the surface of the filamentous body.

The fineness, the fiber diameter, the fiber bundle diameter, and the number of fiber bundles of the organic fiber bundle are not particularly specified, and the diameter equivalent to the linear body (D) is satisfied so as to satisfy the surface anchor coefficient of the fiber-reinforced resin reinforcing material. ), The projection ratio (T = (h / D)), and the coverage (Y) of the organic fiber bundle as the surface material on the surface of the filamentous body may be determined.

The coverage (Y) indicates the ratio of the organic fiber bundles covering the peripheral surface of the filamentous body, and the filamentous body can be described by using the examples shown in FIGS. 1 and 2. The circumference of is (π
D), one width of the organic fiber bundle is represented by (Lc), and if the number of bundles in contact with the cross section is represented by n,
The ratio (Yc) represented by (Lc × n / πD) is obtained.

The striation length of the longitudinal section of the muscle is (Attl),
The width of the organic fiber bundle in contact with this is represented by (Abl),
If the number of bundles is n, the ratio (YL) represented by (Abl × n / Attl) can be obtained.

The coverage (Y) is the ratio of these two (Yc =
(Lc × n / πD)) and (YL = (Abl × n / Att)
l)).

The surface anchor coefficient is a value obtained by dividing the projection ratio (h / D) by the coverage rate (Y) of the organic fiber bundle as the surface material on the surface of the filamentous body. The area of the valley portion formed by the surface material covering the surface of the filament is indirectly quantified.

Here, the relationship between the surface anchor coefficient of the fiber-reinforced resin reinforcing material and the bond strength with concrete will be described.

The adhesive strength of the reinforcing material embedded in the concrete is dominated by the stress due to the anchor effect of shearing the concrete in contact with the uneven portion formed on the surface of the reinforcing material.

Of course, the adhesive strength due to the chemical bond between the interface between the reinforcing material and the concrete is also recognized, but it was experimentally confirmed that they are considerably smaller than the stress due to the anchor effect.

Then, as a result of diligent study on what kind of unevenness is formed on the surface of the reinforcing material is effective for improving the adhesion strength with concrete, the surface anchor coefficient is 0.4.
It was confirmed that a high adhesive strength was obtained when the ratio was 1.0 or less, and the present invention was accomplished.

If the surface anchoring coefficient is less than 0.4, the protrusion ratio is too small or the covering density is too high, and the reinforcing material has a flat surface, and a sufficient anchoring effect cannot be expected.

If the surface anchoring coefficient exceeds 1.0, the projection ratio is too large, which makes it difficult to manufacture the reinforcing material, or the covering density is too low, and the surface material cannot withstand the shear load with the concrete and is damaged. The anchor effect cannot be expected because it will occur.

As a method of coating the surface material, a braid method is preferable because it can easily obtain high adhesion strength with concrete.

In the case of the braiding method, the fiber bundles covering the filaments intersect in the form of plain weave and are woven, and the surface material is partially damaged when subjected to shearing action with concrete. It is considered that the effect is that it is difficult to reach the entire surface even when receiving

In a coating method in which there is no intersection between the fiber bundles for coating the filamentous body, for example, in the spiral winding method, the coated fiber bundles are easily peeled off due to the shearing action with concrete, and the partial damage of the coating layer is caused. This is not preferable because it tends to lead to peeling of the entire coating layer immediately.

Such a fiber-reinforced resin reinforcing material of the present invention is manufactured, for example, by the following method.

A high-strength continuous fiber bundle made of at least one kind of carbon fiber, aramid fiber and polyarylate fiber,
After impregnating an uncured thermosetting resin and drying, the surface of a linear body composed of an assembly of a plurality of the fiber bundles, which are bundled with a die, roll, etc., is covered with an organic fiber bundle by a braiding method. Then, it can be manufactured by subjecting the thermosetting resin to a curing heat treatment.

The high-strength continuous fiber bundle used here is a bundle of thousands to hundreds of thousands of single fibers.

For impregnating the high-strength continuous fiber bundle with a resin, for example, a resin solution diluted with a solvent is continuously impregnated with the resin through a continuous fiber bundle, and then the solvent is continuously impregnated in a drying furnace. It is carried out by a method of volatilizing.

The continuous fiber bundle impregnated with the resin is usually used by bundling a plurality of fibers. The number of fiber bundles used is determined from the cross-sectional area of the manufactured linear body and the cross-sectional area of the fiber bundle.

When a plurality of continuous fiber bundles are collected and used, the continuous fiber bundles of the same kind do not have to be used, and if necessary, different kinds of continuous fiber bundles may be collected and used.

The continuous fiber bundle can be bundled by passing it through a die or roll, twisting the continuous fiber bundle, or the like. Further, the surface material may be coated to serve as a focusing process.

After impregnation with an uncured thermosetting resin and drying, the filamentous body which is an assembly of a plurality of bundles of high-strength continuous fiber bundles is formed by coating the surface of an organic fiber bundle with the thermosetting resin used. By heat-treating the resin under the heat-treatment conditions, the resin can be cured to obtain a fiber-reinforced resin reinforcing material.

The heat treatment may be carried out either continuously in the furnace or batchwise in the furnace.

[0059]

By using a fiber-reinforced resin reinforced material which is braided with an organic fiber bundle as a surface material on the surface of a filament body, which is an assembly of high-strength continuous fiber bundles of the present invention, High reinforced concrete can be obtained.

That is, it was clarified that the adhesion behavior of the reinforcing material and the concrete was dominated by the unevenness of the surface of the reinforcing material and the shearing action of the concrete, and the relationship between the height and the density of the unevenness was replaced with the surface anchor coefficient to make the adhesion. That is, the range in which the strength is good is specified.

Further, it is important that the surface material is made of an organic fiber bundle having a shrinkage ratio of 5% or more so as to be integrated with the filamentous body, and that the organic fiber bundle has an alkali resistance to withstand concrete curing. .

[0062]

【Example】

[0063]

Example 1 A fiber bundle in which 3000 carbon fibers having a tensile strength of 350 kgf / mm ² and a tensile elastic modulus of 35 tonf / mm ² were bundled was dissolved with methyl ethyl ketone, and 1
After impregnating with an epoxy resin of a type that cures at 40 ° C. for 1 hour, it was continuously heated in a heating furnace at 90 ° C. for a residence time of 6 minutes to distill off the solvent methyl ethyl ketone.

This fiber bundle 2 impregnated with epoxy resin
0 pieces were focused to obtain a linear body of 3 mmΦ. The surface of this filament was covered with an organic fiber bundle by a braiding method.

The organic fiber bundle used is a spun yarn bundle of polypropylene fibers, having a fineness of 663 denier and a shrinkage ratio of 10% at 140 ° C. A spun yarn bundle of polypropylene fibers was braided by installing 8 bobbins on the inner and outer carriers, respectively.

Further, the epoxy resin was cured by continuously heating it in a heating furnace at 140 ° C. for a residence time of 1 hour to obtain a fiber-reinforced resin reinforcing material.

In all of the obtained braids, the polypropylene fiber was satisfactorily impregnated with the resin and was integrated with the filament.

The protrusion ratio, coverage, and surface anchorage coefficient of the fiber-reinforced resin reinforcement are 0.166, 0.403, and
It was 0.412.

The adhesion strength test with concrete was carried out in accordance with the standards of the Japan Concrete Institute (JCI-SF8). One bridging material was embedded in the mortar of the briquette type test piece, and one day wet air curing was carried out. Then, the autoclave was cured at 160 ° C for 10 hours, and the compressive strength of the mortar was 5
This is a value obtained by dividing the maximum load, which is the result of the tensile test of the test piece of 50 kgf / cm ² , by the embedding area.

The values are average values of 5 tests. The adhesive strength of the fiber-reinforced resin reinforcing material having a surface anchor coefficient of 0.412 was 145 kgf / cm ² .

[0071]

Example 2 A fiber bundle in which 3000 carbon fibers having a tensile strength of 350 kgf / mm ² and a tensile elastic modulus of 35 tonf / mm ² were bundled was dissolved with methyl ethyl ketone, and 1
After impregnating with an epoxy resin of a type that cures at 40 ° C. for 1 hour, it was continuously heated in a heating furnace at 90 ° C. for a residence time of 6 minutes to distill off the solvent methyl ethyl ketone.

This fiber bundle 4 impregnated with epoxy resin
0 pieces were converged to obtain a linear body of 4.4 mmΦ. The surface of this filament was covered with an organic fiber bundle by a braiding method.

The organic fiber bundle used is a spun yarn bundle of polypropylene fibers, having a fineness of 1326 denier and a shrinkage ratio of 10% at 140 ° C.

A spun yarn bundle of polypropylene fibers was braided by placing 6 bobbins on the inner and outer carriers, respectively.

Further, the epoxy resin was cured by continuously heating it in a heating furnace at 140 ° C. for a residence time of 1 hour to obtain a fiber-reinforced resin reinforcing material.

In all of the obtained braids, the polypropylene fiber was satisfactorily impregnated with resin and was integrated with the filament.

The fiber-reinforced resin reinforcement has a projection ratio, a coverage and a surface anchoring coefficient of 0.140, 0.340, respectively.
It was 0.412.

The adhesion strength test with concrete and the mortar curing conditions were carried out according to Example 1. The adhesive strength of the fiber-reinforced resin reinforcement having a surface anchor coefficient of 0.412 was 153 kgf / cm ² .

[0079]

Example 3 A fiber bundle in which 3000 carbon fibers having a tensile strength of 350 kgf / mm ² and a tensile elastic modulus of 35 tonf / mm ² were bundled was dissolved with methyl ethyl ketone, and 1
After impregnating with an epoxy resin of a type that cures at 40 ° C. for 1 hour, it was continuously heated in a heating furnace at 90 ° C. for a residence time of 6 minutes to distill off the solvent methyl ethyl ketone.

This fiber bundle 4 impregnated with epoxy resin
0 pieces were converged to obtain a linear body of 4.4 mmΦ. The surface of this filament was covered with an organic fiber bundle by a braiding method.

The organic fiber bundle used is a spun yarn bundle of polypropylene fibers, having a fineness of 1989 denier and a shrinkage of 10% at 140 ° C.

A spun yarn bundle of polypropylene fibers was braided by placing 4 bobbins on the inner and outer carriers, respectively.

Further, the epoxy resin was continuously heated in a heating furnace having a residence time of 1 hour at 140 ° C. to cure the epoxy resin to obtain a fiber-reinforced resin reinforcing material. In each of the obtained braids, the resin was satisfactorily impregnated in the polypropylene fiber and was integrated with the filament.

The protrusion ratio, coverage, and surface anchorage coefficient of the fiber-reinforced resin reinforcement are 0.203, 0.258, and
It was 0.788.

The adhesion strength test with concrete and the mortar curing conditions were carried out according to Example 1. The adhesive strength of the fiber-reinforced resin reinforcement having a surface anchor coefficient of 0.788 was 163 kgf / cm ² .

[0086]

Example 4 A fiber bundle in which 3000 carbon fibers having a tensile strength of 350 kgf / mm ² and a tensile elastic modulus of 35 tonf / mm ² were bundled was dissolved with methyl ethyl ketone, and 1
After impregnating with an epoxy resin of a type that cures at 40 ° C. for 1 hour, it was continuously heated in a heating furnace at 90 ° C. for a residence time of 6 minutes to distill off the solvent methyl ethyl ketone.

This fiber bundle 4 impregnated with epoxy resin
0 pieces were converged to obtain a linear body of 4.4 mmΦ. The surface of this filament was covered with an organic fiber bundle by a braiding method.

The organic fiber bundle used is a continuous yarn bundle of polyester fibers, having a fineness of 1000 denier and a shrinkage ratio of 10% at 120 ° C.

A continuous yarn bundle of polyester fibers is used as an inner
6 bobbins were installed on the outer carrier and braided.

Further, the epoxy resin was cured by continuous heating in a heating furnace at 140 ° C. for a residence time of 1 hour to obtain a fiber-reinforced resin reinforcing material.

In all of the obtained braids, the resin was satisfactorily impregnated in the polyester fiber and was integrated with the filament.

The protrusion ratio, coverage, and surface anchorage coefficient of the fiber-reinforced resin reinforcing bar were 0.152, 0.335, and
It was 0.454.

The mortar curing conditions were 30 days of underwater curing, and the mortar had a compressive strength of 520 kgf / cm ² . The adhesion strength test with concrete was performed according to Example 1.

The adhesive strength of the fiber-reinforced resin reinforcing material having a surface anchor coefficient of 0.454 was 136 kgf / cm ² .

[0095]

Comparative Example 1 A fiber bundle in which 3000 carbon fibers having a tensile strength of 350 kgf / mm ² and a tensile elastic modulus of 35 tonf / mm ² were bundled was dissolved with methyl ethyl ketone, and 1
After impregnating with an epoxy resin of a type that cures at 40 ° C. for 1 hour, it was continuously heated in a heating furnace at 90 ° C. for a residence time of 6 minutes to distill off the solvent methyl ethyl ketone.

This fiber bundle 4 impregnated with epoxy resin
0 pieces were converged to obtain a linear body of 4.4 mmΦ. The surface of this filament was covered with an organic fiber bundle by a braiding method.

The organic fiber bundle used is a continuous yarn bundle of polypropylene fibers, having a fineness of 680 denier and a shrinkage ratio of 15% at 140 ° C.

A continuous yarn bundle of polypropylene fibers was placed on each of an inner carrier and an outer carrier, and 11 bobbins were set and braided.

Further, the epoxy resin was continuously heated in a heating furnace having a residence time of 1 hour at 140 ° C. to harden the epoxy resin to obtain a fiber-reinforced resin reinforcing material. In all of the obtained braids, the resin was satisfactorily impregnated in the polypropylene fiber and was integrated with the filament.

The fiber reinforced resin reinforcement has a projection ratio, a coverage and a surface anchoring coefficient of 0.136, 0.527, respectively.
It was 0.258.

The adhesion strength test with concrete and the mortar curing conditions were carried out according to Example 1. The adhesive strength of the fiber-reinforced resin reinforcing material having a surface anchor coefficient of 0.258 was 77 kgf / cm ² .

[0102]

[Comparative Example 2] A fiber bundle in which 3000 carbon fibers having a tensile strength of 350 kgf / mm ² and a tensile elastic modulus of 35 tonf / mm ² were bundled was dissolved with methyl ethyl ketone, and 1
After impregnating with an epoxy resin of a type that cures at 40 ° C. for 1 hour, it was continuously heated in a heating furnace at 90 ° C. for a residence time of 6 minutes to distill off the solvent methyl ethyl ketone.

This fiber bundle 4 impregnated with epoxy resin
0 pieces were converged to obtain a linear body of 4.4 mmΦ. The surface of this filament was covered with an organic fiber bundle by a braiding method.

The organic fiber bundle used is a spun yarn bundle of polypropylene fibers, having a fineness of 1326 denier and a shrinkage ratio of 10% at 140 ° C.

A spun yarn bundle of polypropylene fibers was braided by installing two bobbins for each of the inner and outer carriers.

Further, the epoxy resin was cured by continuous heating in a heating furnace at 140 ° C. for a residence time of 1 hour to obtain a fiber-reinforced resin reinforcing material. In each of the obtained braids, the resin was slightly impregnated in the polypropylene fiber and was partially separated from the striatum.

The fiber-reinforced resin reinforcement has a projection ratio, a coverage and a surface anchoring coefficient of 0.140, 0.120, respectively.
It was 1.166.

The adhesion strength test with concrete and the mortar curing conditions were the same as in Example 1.

The fiber-reinforced resin reinforcing material having a surface anchor coefficient of 1.166 had an adhesive strength of 58 kgf / cm ² .

[0110]

Comparative Example 3 A fiber bundle in which 3000 carbon fibers having a tensile strength of 350 kgf / mm ² and a tensile elastic modulus of 35 tonf / mm ² were bundled was dissolved with methyl ethyl ketone, and 1
After impregnating with an epoxy resin of a type that cures at 40 ° C. for 1 hour, it was continuously heated in a heating furnace at 90 ° C. for a residence time of 6 minutes to distill off the solvent methyl ethyl ketone.

Fiber bundle 40 impregnated with this epoxy resin
The books were focused to obtain a linear body of 4.4 mmΦ. The surface of this filament was covered with an organic fiber bundle by a spiral winding method.

The organic fiber bundle used is a spun yarn bundle of polypropylene fibers, having a fineness of 1326 denier and a shrinkage of 10% at 140 ° C.

A spun yarn bundle of polypropylene fibers was spirally wound with 12 bobbins set only on the outer carrier.

Further, the epoxy resin was cured by continuously heating in a heating furnace at 140 ° C. and a residence time of 1 hour to obtain a fiber-reinforced resin reinforcing material. In each of the obtained braids, the resin was satisfactorily impregnated in the polypropylene fiber and was integrated with the filament.

The fiber-reinforced resin reinforcement has a projection ratio, a coverage, and a surface anchor coefficient of 0.140, 0.330, and
It was 0.424.

The adhesion strength test with concrete and the mortar curing conditions were the same as in Example 1.

The adhesive strength of the fiber-reinforced resin reinforced material having the surface anchor coefficient of 0.424 coated by the spiral winding method is 65 kgf / cm ^2, which is lower than that of the braiding method.

[0118]

Comparative Example 4 A fiber bundle in which 3000 carbon fibers having a tensile strength of 350 kgf / mm ² and a tensile elastic modulus of 35 tonf / mm ² were bundled was dissolved with methyl ethyl ketone, and 1
After impregnation with an epoxy resin of a type that cures at 40 ° C. for 1 hour, it was continuously heated in a heating furnace at 90 ° C. for a residence time of 6 minutes to distill off the solvent methyl ethyl ketone.

Fiber bundle 40 impregnated with this epoxy resin
The books were focused to obtain a linear body of 4.4 mmΦ.

This filament was not coated with a surface,
The epoxy resin was cured by continuously heating it in a heating furnace at a temperature of 1 ° C. for a residence time of 1 hour to obtain a filament.

The surface anchor factor is 0.0. The adhesion strength test with concrete and the mortar curing conditions were carried out according to Example 1.

The adhesive strength of the filament having a surface anchor coefficient of 0.0 was 7.3 kgf / cm ² .

[0123]

EFFECT OF THE INVENTION By using the fiber-reinforced resin reinforcing material of the present invention, it is possible to obtain mortar and concrete reinforced with FRP reinforcing material having good adhesion properties to concrete.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a fiber-reinforced resin reinforcing material of the present invention.

FIG. 2 is a side view of the fiber-reinforced resin reinforcing material of the present invention.

[Explanation of symbols]

 1 Striatum 2 Surface material

Claims (1)

[Claims] 1. A filament made of fiber-reinforced resin and a braided material whose surface is braided with a surface material made of an organic fiber bundle have a surface anchoring coefficient of 0.1. A fiber-reinforced resin reinforced material that is 4 or more and 1.0 or less. [Equation 1] SC = T / Y = (h / D) / (YC × YL) (1) where SC: surface anchor coefficient T: protrusion ratio Y: organic that is a surface material for the surface of the striatum Coverage rate of fiber bundle h: Average height of top of organic fiber bundle which is a surface material braided on the surface of filamentous body D: Equivalent diameter of filamentary body YC: Fiber bundle to cross-section perimeter of filamentous body Ratio of contact length YL: Ratio of contact length of fiber bundle to longitudinal extension of filament