JPH0967943A - One-way reinforced fiber material for repairing / reinforcing concrete structure, repairing / reinforcing method for concrete structure and its repairing / reinforcing structure - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] A reinforcing fiber material for repairing / reinforcing a concrete structure used for reinforcing an existing concrete structure with a fiber-reinforced resin, which has excellent linearity of reinforcing fibers and is suitable for a concrete structure. It has high strength and does not have the problem of shortening the storage time (working time) that occurs when it contains a matrix resin. It is lightweight and has excellent drapeability during its construction, and it can be easily attached to the body. There is no trapping of air, and it can follow uneven areas,
Provided are a reinforced fiber material for repairing / reinforcing a concrete structure, which has excellent workability without depending on a temperature during construction, and a repairing / reinforcing method thereof and a repairing / reinforcing structure thereof. SOLUTION: The unidirectional reinforcing fiber material for repairing / reinforcing a concrete structure of the present invention is woven by using reinforcing long fibers aligned in one direction as warps and thermoplastic resin fibers as wefts. The thermoplastic resin fibers have a structure in which warp yarns are fused and bound to each other.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a unidirectional reinforcing fiber material for repairing / reinforcing a concrete structure, which is used when repairing / reinforcing an existing concrete structure with a fiber reinforced resin,
The present invention relates to a method for repairing / reinforcing a concrete structure and a repairing / reinforcing structure for a concrete structure using the unidirectional reinforcing fiber material for repairing / reinforcing the concrete structure.

[0002]

2. Description of the Related Art Existing concrete structures deteriorate or deteriorate with the use for many years, and the floor slabs of elevated parts of expressways and general roads, and the amount of traffic on piers increase dramatically.
With the increasing size of vehicles, the safety factor at the time of design was exceeded, and the number of locations requiring reinforcement is increasing rapidly. On the other hand, even in general concrete structures, the number of cases in which reinforcement / repair is required is increasing due to deterioration of strength due to aging / deterioration due to long-term use and damage due to earthquake.

An iron plate has been used as a reinforcing material for the reinforcement of such a structure from the past, but the iron plate is heavy and the workability at the time of mounting is poor, and the iron plate cannot follow the complicated shape of the body. After mounting, there was a problem that grout had to be filled between the iron plate and the body.

In order to solve such a problem, in recent years, a reinforcing and repairing method using a so-called prepreg obtained by impregnating a reinforcing fiber sheet with a resin as a reinforcing material, and a repair using FRP obtained by curing and molding the same as a reinforcing material. -Reinforcement methods have been proposed, which contribute to weight reduction of reinforcement materials and improvement of workability.

Conventionally, a method of applying a fiber-reinforced resin material to a concrete structure is as follows: (1) A so-called FRP manufactured by impregnating a matrix resin component into a reinforcing fiber sheet and then curing and molding the resin component. Is adhered to a concrete structure (see, for example, JP-A-63-35967), or (2) a reinforcing fiber sheet is impregnated with a matrix resin component and cured by suppressing the curing of the resin component. A method of forming a prepreg in an unhardened state (unhardened state, semi-hardened state), adhering this to a concrete structure, and then hardening the matrix resin (for example, JP-A-3-224966 and JP-A-63).
No. 35967, Japanese Patent Application Laid-Open No. 7-34677), or (3) a concrete structure is obtained by impregnating a reinforcing resin sheet adhered to a support through an adhesive layer with a matrix resin at a construction site. A method of adhering and curing the resin (see, for example, JP-A-3-222734), or (4) wrapping a reinforcing fiber woven sheet around a required reinforcement portion of a concrete structure, and applying a room temperature curable matrix resin thereto. A method of impregnating and hardening is known.

On the other hand, in order to further improve the strength of the FRP and the performance of the prepreg, a reinforcing fiber sheet obtained by laminating one or more unidirectional fiber sheets is used for the FRP and the prepreg. . The unidirectional fiber sheet is stored in a state of being carried on a support sheet such as a scrim cloth, a glass cloth, a release paper, a nylon film, etc., but the sheet state is easily disturbed and its handleability is poor. Therefore, when applying the unidirectional fiber sheet to a concrete structure, there is a method of applying prepreg to the concrete structure in advance as described in (2) and (3) above. Has been adopted.

[0007]

However, in the method (1) using the FRP, since the FRP molded in the factory is used, the shape following the surface structure of the reinforcing portion of the concrete structure, The construction was complicated due to the inconvenience that it was difficult to increase the strength and the shape of the concrete structure.

In the method using the prepreg of the above (2) and (3), since the matrix resin component is contained in the prepreg in an amount of 8 to 40% by weight, usually 30 to 40% by weight, the resin is impregnated. There is a problem that the weight is larger than that of the unreinforced fiber sheet, and the workability in the case of construction on site is poor. Especially when installing on beams or ceilings,
When the construction work is required to be performed upward, the weight of the construction work is a heavy burden on the worker.

In the method using a prepreg, since the matrix resin is contained in the prepreg, the drape property is worse than that of the reinforcing fiber sheet not impregnated with the matrix resin. It is difficult to follow the shape of the structure, and in particular, in order to make the prepreg follow and stick to a so-called unplanned part such as concrete, it is necessary to further improve the drape property of the prepreg. Is also pointed out. Further, there is a drawback that air is likely to be caught between the skeleton and the prepreg, and it takes time to release the air.

In Japanese Patent Laid-Open No. 7-34677, as a countermeasure against the problems such as the entrapment of air and the insufficient drapability, the resin content is 15% by weight or less (preferably 8 to 12% by weight). ) Has been proposed, but if the matrix resin content is reduced, the reinforcing fibers will fall apart when the prepreg is peeled from the release sheet or cut into a predetermined size, resulting in poor shape stability. In terms of sex, new problems are emerging. Furthermore, even such a prepreg having a resin content of 15% by weight or less (preferably 8 to 12% by weight) is not one in which the matrix resin is completely removed. Therefore, like a general prepreg, it is included in the prepreg. Since the matrix resin used is a semi-cured resin, it is soft at high temperatures, the adhesive effect is poor in the summer and the reinforcing fiber sheet falls off from the support sheet, while it becomes hard in cold weather and drapes easily. There are problems caused by high temperature dependence such as chipping and difficulty in fitting to concrete structures.

Further, the prepreg generally contains a curing agent in the resin component, and the curing of the resin progresses with time, which limits the storage period (working time). As a measure against this,
Although measures are taken to use a curing agent that cures at high temperature, the progress of curing of the resin remains an unavoidable problem.

Further, also in the case of using a prepreg using a curing agent for high temperature curing and a prepreg containing no curing agent, a method of applying the curing agent afterwards is adopted, and a method of applying this curing agent afterwards is adopted. Although a solution in which a curing agent component is dissolved in an organic solvent is applied, in this case, there is a problem that the organic solvent evaporates at the construction site and the working environment is deteriorated.

In the method (4) of using a woven fabric sheet of reinforcing fiber, since the reinforcing fiber itself is a woven fabric, there is a crossing portion between the warp and the weft. However, there is a problem that the strength of the woven fabric sheet impregnated with a matrix resin and cured becomes weak. In particular, since the strength is required for the beams and columns of the concrete structure, the reinforcing fiber sheet itself is also required to have high strength. It is also possible to use a so-called non-crimp woven fabric, but even in the non-crimp woven fabric, when the fabric is cut in accordance with the shape of the body to be attached, the end of the fabric is gradually loosened and the handleability deteriorates. In addition, if the number of weft threads is too large, the resin impregnation property at the intersection of the weaving yarns is impaired, while if it is too small, the reinforcing fibers are displaced during construction and the linearity of the reinforcing fibers cannot be maintained, and the handleability deteriorates. Problems are likely to occur.

Therefore, an object of the present invention is to provide a reinforced fiber sheet for repairing / reinforcing a concrete structure, which is used when reinforcing an existing concrete structure with a fiber reinforced resin,
The linearity of the reinforcing fibers is excellent, it can give high strength to the concrete structure, and there is no problem that the storage time (working time) that occurs when containing a matrix resin is shortened, and it is lightweight at the time of its construction. A concrete structure that has excellent drapeability, does not entrap air with the skeleton, can follow uneven areas, has no temperature dependency depending on the environment during construction, and has excellent workability. It is to provide a reinforcing fiber sheet for repair and reinforcement.

Another object of the present invention is to impregnate a thermosetting resin on the surface of a concrete structure into a reinforcing structure fibrous sheet for repairing / reinforcing a concrete structure, and the impregnation can be easily carried out. To provide a reinforcing fiber sheet for repairing / reinforcing a concrete structure suitable for on-site application to an existing concrete structure, in which the reinforcing fiber itself is not damaged during impregnation and the parallelism of the reinforcing fiber is not disturbed. It is in.

Another object of the present invention is to provide a reinforcing method and a reinforcing structure thereof using such a reinforcing fiber sheet for repairing / reinforcing a concrete structure.

[0017]

In order to solve the above-mentioned problems, the unidirectional reinforcing fiber material for repairing / reinforcing a concrete structure of the present invention comprises reinforcing long fibers arranged in one direction. It is characterized by being woven as a warp and using a thermoplastic resin fiber as a weft, and the warp yarns are fused to each other by the thermoplastic resin fiber.

The method of reinforcing a concrete structure according to the present invention comprises (1) applying an adhesive or a matrix resin having adhesiveness to the surface of the concrete structure, and (2) repairing and reinforcing the concrete structure according to the present invention. A unidirectional reinforcing fiber material is arranged on the surface of the adhesive or matrix resin having adhesiveness, and (3) the matrix resin is or is not applied to the unidirectional reinforcing fiber material for repairing / reinforcing the concrete structure. As it is, the unidirectional reinforcing fiber material for repairing / reinforcing the concrete structure is pressure-bonded, so that the adhesive or matrix resin in the lower layer is sprung up so that the air bubbles contained in the unidirectional reinforcing fiber material for repairing / reinforcing the concrete structure. The concrete structure repair / reinforcement unidirectionally reinforced fiber material with an adhesive or matrix resin. Wherein the curing.

The reinforced structure of the concrete structure of the present invention comprises a unidirectional reinforcing fiber material for repairing / reinforcing the concrete structure of the present invention, a predetermined number of which are laminated on the surface of the concrete structure, and the matrix of thermosetting resin is used to form concrete. It is characterized by being integrated with the body.

In the present specification, the "unidirectional reinforcing fiber material for repairing / reinforcing concrete structures" is abbreviated as "unidirectional reinforcing fiber material" hereinafter.

The unidirectional reinforcing fiber material of the present invention is obtained by weaving the reinforcing long fibers arranged in one direction in the same direction as warp yarns and the thermoplastic resin fibers as weft yarns. It is a sheet in which warp yarns are fused to each other by fibers and does not contain a matrix resin. Then, according to the method for reinforcing a concrete structure of the present invention using the unidirectionally reinforced fiber material, when arranging the unidirectionally reinforced fiber material in the concrete structure, the one not impregnated with the matrix resin is used. Therefore, the weight thereof is lighter than that of the one impregnated with the matrix resin, and the workability is excellent. Moreover, since it is not impregnated with the matrix resin, it is excellent in drapeability, air is not trapped between the skeleton and the prepreg, and the complex structure on the surface of the concrete structure can be adhered and adhered.

Since the unidirectionally reinforced fiber material of the present invention is impregnated with the matrix resin at the construction site, it is not necessary to consider the preservability of the unidirectionally reinforced fiber material.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Types of reinforcing fibers usable in the unidirectional reinforcing fiber material of the present invention include carbon fiber, glass fiber,
Organic or inorganic fibers such as aramid fibers, alone or 2
It is a combination of two or more species. In order to give high strength to the concrete structure, carbon fiber is particularly preferably used, and examples of the carbon fiber include acrylic carbon fiber and pitch carbon fiber. It is preferable that the surface of these carbon fibers is activated by a surface treatment in order to increase the affinity for resins and the like.

When two or more kinds of reinforcing fibers are used, for example, by arranging glass fibers mainly with carbon fibers at regular intervals, for example, 5 cm intervals, it can be used as a guide when cutting sheets on site. You can Further, since glass fiber becomes transparent when impregnated with resin, it can be used to confirm the resin impregnation property into the reinforcing fiber sheet. Further, by using carbon fibers and aramid fibers in combination or carbon fibers having different breaking elongations in combination, it is possible to prevent fiber breakage at once and improve the toughness of the concrete structure.

Examples of the component of the thermoplastic resin fiber used as the weft of the unidirectionally reinforced fiber material of the present invention include polyamide such as nylon 6, nylon 12, nylon 66, polyethylene, polyester, etc., and one or two of them may be used.
Combinations of more than one type can be used. In particular, thermoplastic resin fibers having a melting temperature of 70 to 200 ° C. are suitable. The reason is that fibers that melt below 70 ° C have poor shape retention in the summer when the temperature rises, while if the melting temperature exceeds 200 ° C, a large amount of energy is required for heat fusion. This is because. For the thermoplastic resin fiber used as the weft of the unidirectionally reinforced fiber material of the present invention, it is possible to select and weave two types of yarns having different melting points, and then melt and bind only the weft on the low melting point side. .

Since the unidirectional reinforcing fiber material of the present invention binds the reinforcing fibers by melting the thermoplastic resin fibers, a woven fabric obtained by simply weaving warp yarns and weft yarns is used to repair the structure.
Unlike the case of using it for reinforcement, even if it is cut according to the shape of the skeleton, the problem of loosening the end does not occur. Further, even if the number of wefts impeding the drape property and the resin impregnation property is reduced to 20 yarns / m or more and 100 yarns / m or less, the reinforcing fibers are displaced and the linearity cannot be maintained, and the handleability is deteriorated. Such problems can be prevented.

An ordinary weaving machine can be used for weaving the interdigital fabric, and the weaving width can be arbitrarily selected within the specifications of the weaving machine. At the time of weaving, it is necessary to consider that the warp is not crimped in order to obtain a strong unidirectional reinforcing fiber material.

The fusion and integration of the reinforcing fiber sheet and the thermoplastic resin fiber can be carried out by passing them between heated rollers or by sandwiching them with a heating plate and heating. Further, when the reinforcing fiber sheet material is carbon fiber, a method of utilizing resistance heat generation of carbon fiber due to energization is also effective.

The degree of thermal fusion between the reinforcing fibers and the thermoplastic resin fibers is preferably such that the thermoplastic resin fibers are melted and adhered to each other to the extent that the thermoplastic resin fibers maintain the fiber state. When the thermoplastic resin fiber is completely melted and forms a film,
This is because the mesh structure of the woven fabric is completely blocked, or the mesh that serves as a through hole for the matrix resin to pass through is reduced, and the impregnability of the matrix resin is lacking.

Unlike the conventional unidirectional reinforcing fiber material impregnated with a prepreg type resin, the unidirectional reinforcing fiber material obtained by the production method of the present invention is not impregnated with a resin component and is a completely dry type. And is lightweight,
There is drape. Further, since the unidirectional reinforcing fiber material obtained by the manufacturing method of the present invention does not go through a manufacturing step in which a reinforcing fiber sheet which has been conventionally performed is bonded to a support with an adhesive, a through hole is formed by the adhesive. There is no inconvenience such as clogging, and when bonding unidirectional reinforcing fiber material to concrete structure during on-site construction, since it contains matrix resin, it is lightweight and excellent in workability and has drapeability. The shape of the surface of the structure can be followed. Further, upon impregnation with the matrix resin, the impregnating ability of the matrix resin is extremely high, and the fiber areal weight can be selected in a wide range.

The lower limit of the basis weight of the unidirectionally reinforced fiber material of the present invention is usually 50 g / m ² or more, preferably 200 g / m ² or more, from the viewpoint of reducing the laminating step,
On the other hand, the upper limit of the basis weight should not exceed 800 g / m ² because the impregnating property of the matrix resin becomes poor as the basis weight becomes large.

The construction of the unidirectionally reinforced fiber material of the present invention on the surface of a concrete structure is carried out by subjecting the surface of the concrete structure to an ordinary undercoating treatment in advance, and then applying an adhesive or a matrix resin having adhesiveness, A unidirectionally reinforced fiber material is provided, and a matrix resin is further applied according to the thickness and resin amount of the fiber layer of the unidirectionally reinforced fiber material, or as it is, by a crimping tool such as a roller, the unidirectionally reinforced fiber material. By pressing down, the adhesive or matrix resin applied to the lower layer is sprung up, and air bubbles contained in the fiber layer of the unidirectional reinforcing fiber material are expelled while the fiber layer is sufficiently impregnated with the adhesive. . The adhesive applied at this time is
As long as it has adhesiveness, it may be the same component as the matrix resin, or it is preferable that it has affinity with the matrix resin and also serves as the matrix resin.

When the unidirectional reinforcing fiber material of the present invention is multiply laminated on the surface of a concrete structure, the matrix resin is applied and the unidirectional reinforcing fiber material is arranged for each layer.
It is advisable to impregnate the resin with a pressure-bonding tool such as a roller each time. When the resin is impregnated into the unidirectionally reinforced fiber material of the present invention, the unidirectionally reinforced fiber material of the present invention has the reinforcing lengths aligned in one direction even if a crimping tool such as a roller is used. Since the fibers are woven as warps and the thermoplastic resin fibers as wefts, there is no fluffing due to the crimping tool during impregnation.

FIG. 1 shows a cross section of a repair / reinforcement structure when the unidirectional reinforcing fiber material of the present invention is applied to a concrete structure. Reference numeral 1 denotes a concrete structure, and a state in which a unidirectional reinforcing fiber material 2 in which reinforcing fibers which are warp threads are fused to each other by thermoplastic resin fibers which are weft threads are attached to a beam portion of the concrete structure 1. Is shown.

The matrix resin to be impregnated into the unidirectionally reinforced fiber material of the present invention is preferably selected from a combination of a resin component such as epoxy and a curing agent so as to cure at 20 to 40 ° C. within several days. .

In consideration of the impregnation property into the unidirectional reinforcing material fiber sheet, the resin viscosity is preferably adjusted to 200 poise or less (20 ° C.), particularly preferably 10 to 100 poise (20 ° C.). However, viscosity adjustment with organic solvents should be avoided so as not to damage the environment at the construction site.

The type of the adhesive and the matrix resin is not particularly limited, but it can be applied in a wide temperature range from 5 ° C. to 60 ° C. in winter, and even if the body is relatively wet, curing failure does not occur, and adhesion with the body is possible. Due to its excellent properties,
Preferred are epoxy resins that have a proven record in the construction field. As the epoxy resin preferably used in the present invention, bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin, phenol novolac type epoxy resin, cresol novolac type epoxy resin, alicyclic epoxy resin,
Examples thereof include halogenated epoxy resins and glycidyl amine type epoxy resins.

As a reactive diluent for epoxy resin, n-
At least one selected from butyl glycidyl ether, allyl glycidyl ether, 2-ethylhexyl glycidyl ether, styrene oxide, phenyl glycidyl ether, cresyl glycidyl ether, and glycidyl methacrylate can be used in combination, and to adjust the viscosity to a suitable level without solvent. It is valid.

As the curing agent and curing accelerator for the epoxy resin, those of the type usually used for epoxy resins can be applied. When the matrix resin is an epoxy resin and the reactive diluent is phenyl glycidyl ether, for example, polyamidoamine, amidoamine, diethylenetriamine and other aliphatic polyamines, metaxylenediamine and other aromatic polyamines, menthenediamine and other alicyclic polyamines, modified Examples include polyamines, tertiary amines such as benzylmethylamine, imidazoles such as 2-methylimidazole, polymercaptans, polythiols, and boron trifluoride amine complexes.

The curing agent and the curing accelerator are selected so that the matrix resin cures at room temperature such that the curing temperature is about 10 to 40 ° C. Preferably, the hardeners and accelerators listed above meet this criterion.

[0041]

【Example】

[Example 1] PAN-based high-strength carbon fiber "Vesphite HTA 7-12K" manufactured by Toho Rayon Co., Ltd. (trade name, diameter 7 µ x 12000 filament) was used as warp, and polyethylene fiber was used as weft, and carbon fiber blinds were used. Fabric 10
40 mm width x 50 m length (carbon fiber basis weight 300 g / m ² ,
Number of warp threads 375 / m, number of weft threads 50 /
m) was prepared. Next, the carbon fiber interlaced fabric,
The unidirectionally reinforced fiber material of Example 1 was obtained by continuously passing it through a heating roller kept at 150 ° C. at 0.5 m / min to melt the weft yarns and bind the carbon fibers.

The drapeability of the obtained unidirectional reinforcing fiber material,
Ease of air entrapment, resin impregnability, morphological stability, and bending reinforcing effect of concrete were evaluated. The drape property was evaluated using a feel meter used to measure the feel of natural fibers and synthetic fibers. The results are shown in Table 1 below. It was confirmed that the unidirectionally reinforced fiber material of Example 1 had a low feeling and had excellent drapeability.

The ease of air entrapment was evaluated according to the following procedure. The obtained unidirectional reinforcing fiber material is cut into 300 mm square,
The unidirectional reinforcing fiber material is attached to a steel sheet that has been subjected to a release treatment in the same manner as in the case of applying it to an ordinary concrete structure, and a bisphenol A epoxy resin [Epicote 825 (produced by Yuka Shell Co., Ltd.) Name)] was impregnated and cured with 10 phr of 2-ethyl-4-methylimidazole (manufactured by Shikoku Chemicals Co., Ltd.) as a curing agent.

After the resin was completely cured, the carbon fiber reinforced plastic in which the unidirectional reinforcing fiber material was impregnated and cured with the resin was peeled off from the steel sheet, and the air entrapment condition on the back surface was evaluated in five levels. The results are shown in Table 1 below. as a result,
It was confirmed that the unidirectionally reinforced fiber material of Example 1 was an excellent material with no air trapped.

The resin impregnation property was evaluated on a scale of 5 by observing the presence or absence of voids by observing the carbon fiber reinforced plastic used for evaluation of air entrapment with a microscope under a cross section. The results are shown in Table 1 below. It was confirmed that the repair / reinforcement structure manufactured by using the unidirectionally reinforced fiber material of Example 1 was an excellent structure having no voids at all.

The effect of bending reinforcement of concrete is JIS
100 mm x 100 mm x 40 manufactured according to A1132 "How to make specimens for concrete strength test"
A bending test specimen having a length of 0 mm is subjected to a primer treatment, and then one unidirectional reinforcing fiber material is applied so that the orientation direction of the carbon fiber thereof matches the length direction of the concrete bending test specimen, and JIS A1106 is used. The test was performed according to the "bending strength test method for concrete". The results are shown in Table 1 below.

The morphological stability is an evaluation of handleability at the time of on-site construction, and when the carbon fiber is distorted when cut at right angles to the orientation direction of the carbon fiber and when cut along the orientation of the carbon fiber, The unraveling of the carbon fiber by cutting the weft was evaluated. Moreover, in the prepregs of Comparative Examples 1 to 4 described later,
The extent to which the carbon fibers fell off the backed glass triaxial woven fabric to the extent that the carbon fibers remained on the release paper side and fell apart when peeled from the resin film was observed. Evaluation is by visual inspection 5
It was a graded evaluation.

[Comparative Example 1] PAN manufactured by Toho Rayon Co., Ltd.
-Based high-strength carbon fiber modified epoxy resin prepreg "Vesfite prepreg # 112" (trade name, 130 ° C curing type, resin content 37%, carbon fiber basis weight 300g / m
Regarding ² ), the drape property and the morphological stability were evaluated in the above Example 1
The evaluation was performed in the same manner as described above.

Regarding the easiness of air entrapment and the bending reinforcing effect of concrete, the above prepreg was attached to the body using a putty-like epoxy resin P-1112 manufactured by Somar Co., Ltd., and then Sakamoto Yakuhin Kogyo Co., Ltd. ) Reactive diluent phenyl glycidyl ether and Shikoku Kasei Co., Ltd. 2M
The mixture of Z was applied, impregnated and cured, and then evaluated.

The results are shown in Table 1 below. The product using the prepreg of Comparative Example 1 has a high resin content and thus has good morphological stability, but has a low drape property and has large air entrapment during construction, resulting in low physical properties.

[Comparative Examples 2 to 4] Prepreg resin # 112 (trade name, 130 ° C. curing type) manufactured by Toho Rayon Co., Ltd., three kinds of resin films having different thicknesses were prepared using a film coater, and then, Carbon fibers obtained by aligning the resin film in one direction (P manufactured by Toho Rayon Co., Ltd.)
AN-based high-strength carbon fiber "Vesphite HTA 7-12
K (product name) "diameter 7μ x 12000 filament) is crimped and impregnated with carbon fiber basis weight 300g /
Prepregs having m ² , resin content of ⁵ , 10 and 18% were produced.

Regarding the prepregs having a resin content of 5, 10%, a glass triaxial woven cloth KT220B woven by Nitto Boseki Co., Ltd. was lined and reinforced.

The obtained carbon fiber prepreg was evaluated in the same manner as in Example 1 with respect to the drape property, the ease of air entrapment, the resin impregnation property, the shape stability, and the bending reinforcing effect of concrete.

With respect to the ease of air entrapment, resin impregnation property, and bending reinforcing effect of concrete, the same epoxy resin composition as that used in Example 1 was used so that the resin content after construction was 37%. Cured. For the prepreg having a resin content of 18%, the mixture of phenyl glycidyl ether and 2MZ used in Comparative Example 1 was applied, and then the epoxy resin composition manufactured by Henkel Hakusui Co., Ltd. was impregnated and cured.

In the evaluation of the bending reinforcing effect of concrete, when the resin content is 5, 10%, after attaching the prepreg to the specimen for bending strength test, only the triaxial braid is peeled off,
The effect of triaxial braiding on physical properties was excluded.

The results are shown in Table 1 below. According to Table 1, in the prepregs of Comparative Examples 2 to 4, although the morphological stability is improved as the resin content increases, the drape property and the resin impregnating property during construction tend to decrease, and the physical properties also tend to decrease. I understand.

[Comparative Example 5] Similar to Example 1, the PAN-based high-strength carbon fiber "Vesphite HTA 7-12K (trade name)" manufactured by Toho Rayon Co., Ltd. (diameter 7 μx120)
00 filament) as warp and polyethylene fiber as weft, carbon fiber interlaced fabric 1040 mm width × 5
0 m length (carbon fiber areal weight 300 g / m ² , warp driving number 375 / m, weft driving number 50 / m)
With the woven fabric in which the weft was not melted, the drapeability, the ease with which air was entrapped, the resin impregnation property, the morphological stability, and the bending reinforcing effect of concrete were evaluated.

The results are shown in Table 1 below. The drapeability, air entrapment, and resin impregnation of the carbon fiber interwoven fabric of Comparative Example 5 were all good, but 1 for physical property measurement.
When it was cut into a width of 00 mm, the weft was unraveled in the end portion of about 20 mm, and it was difficult to handle.

[0059]

[Table 1]

[0060]

EFFECTS OF THE INVENTION Since the unidirectional reinforcing fiber material for repairing / reinforcing a concrete structure of the present invention does not contain a matrix resin, it follows air entrapment and unsteady parts at the time of sticking a frame when a normal prepreg is used. It can solve problems such as insufficient drapability that can not be solved, there is no problem that the storage time (pot life) is shortened, it is lightweight at the time of construction, and temperature dependency is small depending on the environment at the time of construction Excellent workability.

In the unidirectional reinforcing fiber material for repairing / reinforcing a concrete structure of the present invention, since the fibers of the thermoplastic resin are fused between the reinforcing fibers, the reinforcing fibers do not come apart and the resin content rate is high. There is no inconvenience in handleability due to insufficient shape stability as seen in a reinforcing fiber sheet in which a low prepreg or reinforcing fiber is adhered and supported on a support sheet.

Since the unidirectional reinforcing fiber material for repairing / reinforcing a concrete structure of the present invention melts the thermoplastic resin fibers and binds between the reinforcing fibers which are the warps, the woven fabric in which the warps and the wefts are simply woven Unlike when using for repair and reinforcement of structures, even if you cut it according to the shape of the body,
There is no problem of loosening the edges.

The unidirectionally reinforced fiber material for repairing / reinforcing a concrete structure of the present invention, at the intersection of the warp and the weft,
Since the thermoplastic fiber which is the weft is melted, it is possible to suppress the occurrence of crimp in the reinforcing fiber which is the warp, and therefore, the linearity can be secured, so that the strength is high.

In the reinforcing fiber sheet made of a normal woven fabric, the wefts impede the drape property and the resin impregnation property, but when the number of the wefts is reduced, the reinforcing fibers are displaced and the linearity cannot be maintained.
Although the handleability is deteriorated and the strength cannot be maintained, the unidirectional reinforcing fiber material for repairing / reinforcing a concrete structure of the present invention has a thermoplastic fiber, which is a weft, melted into a warp, so There is no such problem even if the number is reduced to 20 lines / m or more and 100 lines / m or less.

Since the unidirectional reinforcing fiber material for repairing / reinforcing the concrete structure of the present invention is woven, a mesh through which the matrix resin can pass is formed. In particular, the number of weft threads is 20 / m or more and 100 or more. When the number is less than or equal to this / m, the matrix resin and bubbles easily pass through, so that the matrix resin is excellent in impregnation property, and the bubbles contained in the reinforcing fiber layer are applied to the lower surface in the step of impregnating the matrix resin component. It is possible to provide a high-strength reinforcing structure for a concrete structure that is driven out by a resin bubbling phenomenon and has less bubbles.

Since the unidirectional reinforcing fiber material for repairing / reinforcing a concrete structure of the present invention has a good impregnating property as described above,
Since it is possible to perform the matrix resin impregnation step after adhering the unidirectional reinforcing fiber material for repairing / reinforcing the lightweight concrete structure of the present invention that does not contain the matrix resin, it is possible to perform the impregnation step of the matrix resin. Significantly improved.

Since the unidirectional reinforcing fiber material for repairing / reinforcing a concrete structure of the present invention has good shape retention by melting the thermoplastic resin fibers and binding between the reinforcing fibers which are warp yarns, when impregnating the resin. Even if a roller or other crimping tool is used, no fluffing occurs due to the crimping tool.

The conventional type reinforcing fiber sheet for repairing / reinforcing a concrete structure containing a thermosetting resin component was required to separately supply the resin component and the curing agent component. When the unidirectional reinforcing fiber material for repairing / reinforcing a concrete structure is used, the matrix resin component including the curing agent component can be impregnated at the same time, which simplifies the construction.

Since the unidirectional reinforcing fiber material for repairing / reinforcing a concrete structure of the present invention is directly adhered to the surface of the concrete structure without containing the matrix resin, a prepreg already containing the matrix resin is used. It has a higher peel strength than that of the above case, and therefore has an excellent reinforcing effect on a concrete structure.

[Brief description of drawings]

FIG. 1 shows a cross section of a repair / reinforcement structure when the unidirectional reinforcing fiber material of the present invention is applied to a concrete structure.

[Explanation of symbols]

 1 Concrete structure 2 Unidirectional reinforcing fiber material

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number in the agency FI Technical display location // B29K 101: 12 105: 08 (72) Inventor Masato Ando Kamishichi character Takaishi, Nagaizumi-cho, Shizuoka prefecture No. 234 Toho Rayon Co., Ltd. Research Institute (72) Inventor Yukio Asano 1 Nakatawara, Joetsu City, Niigata Prefecture Nakatahara Plant, Arisawa Manufacturing Co., Ltd. No. 1 Inside Kumagai Technical Research Institute (72) Inventor Norimitsu Hayashida 1043 Shimoyama, Onigaboge, Tsukuba City, Ibaraki Prefecture No. 1 In Kumagai Technical Research Institute Co., Ltd. (72) Tomoaki Tsujimura Large Demon, Tsukuba City, Ibaraki Prefecture 1043 No. 1 Shimoyama, Kokuboji Kumagai Technical Research Institute

Claims (7)

[Claims] 1. A woven fabric comprising reinforcing long fibers aligned in one direction as warp yarns, and thermoplastic resin fibers as weft yarns, wherein the warp yarns are fused together by the thermoplastic resin fibers. One-way reinforced fiber material for repairing and reinforcing concrete structures. 2. The unidirectional reinforcing fiber material for repairing / reinforcing a concrete structure according to claim 1, wherein the reinforcing long fibers are carbon fibers. 3. The unidirectional reinforcing fiber material for repairing / reinforcing a concrete structure according to claim 1, wherein the thermoplastic resin fiber is melted at 70 ° C. or higher. 4. The unidirectional reinforcing fiber material for repairing / reinforcing a concrete structure according to claim 1, 2 or 3, wherein the thermoplastic resin fibers have a weft threading number of 20 or more and 100 or less. . 5. (1) An adhesive or a matrix resin having adhesiveness is applied to the surface of the concrete structure, (2) One-way for repairing and reinforcing concrete structure according to claim 1, 2, 3 or 4. Reinforcing fiber material is arranged on the surface of the adhesive or matrix resin having adhesiveness, and (3) the one-way reinforcing fiber material for repairing / reinforcing concrete structure is coated with matrix resin or without coating. By pressing the unidirectional reinforcing fiber material for repairing / reinforcing the concrete structure, the adhesive or matrix resin in the lower layer is spouted to expel air bubbles contained in the unidirectional reinforcing fiber material for repairing / reinforcing the concrete structure. At the same time, the unidirectional reinforcing fiber material for repairing / reinforcing the concrete structure is impregnated with an adhesive or a matrix resin and then cured. Repair and reinforcement method of the concrete structure to be. 6. The method for repairing / reinforcing a concrete structure according to claim 5, wherein a matrix resin is applied, and a unidirectional reinforcing fiber material for repairing / reinforcing the concrete structure is provided.
And a method for repairing / reinforcing a concrete structure, characterized in that a step of crimping a unidirectional reinforcing fiber material for repairing / reinforcing a concrete structure is repeated a plurality of times. 7. A predetermined number of unidirectional reinforcing fiber materials for repairing / reinforcing a concrete structure according to claim 1, 2, 3 or 4 are laminated on a surface of the concrete structure, and a concrete frame is formed by a matrix of thermosetting resin. A repair / reinforcement structure for concrete structures characterized by being integrated.