WO2018021230A1

WO2018021230A1 - Mesh and concrete peeling preventing material

Info

Publication number: WO2018021230A1
Application number: PCT/JP2017/026656
Authority: WO
Inventors: 真治西堀
Original assignee: 日本電気硝子株式会社
Priority date: 2016-07-26
Filing date: 2017-07-24
Publication date: 2018-02-01
Also published as: JPWO2018021230A1; JP7010222B2

Abstract

Provided is a mesh with superior push out characteristics, which are an indicator of peeling preventing characteristics for concrete. A woven mesh fabric 1, which is constituted of warp yarn 2 and weft yarn 3, is provided with: a glass fiber bundle having 12% by mass or greater ZrO₂ and 10% by mass or greater R₂O (R is at least one selected from Li, Na, and K) for a glass composition; and a composite fiber bundle with a fracture elongation of 4 - 35% as measured on the basis of JIS R3420 (2013).

Description

Mesh and concrete peeling prevention material

The present invention relates to a mesh and a concrete exfoliation preventing material provided with the mesh.

Conventionally, a method of sticking a reinforcing material to the surface of a concrete structure is known as a measure for preventing peeling in a concrete structure such as a building or a tunnel. As the reinforcing material, a steel plate, fiber reinforced plastic, or a structure in which a mesh fabric is embedded in cement mortar or resin is used.

For example, the following Patent Document 1 discloses a reinforcing fabric used for repairing or reinforcing a concrete surface. The reinforcing fabric is a mesh fabric in which warp yarns and weft yarns made of reinforcing fiber yarns such as carbon fibers are arranged in a mesh shape. Between the reinforcing fiber yarns, 1 to 3 warp auxiliary yarns and weft auxiliary yarns made of glass yarn are arranged. In Patent Document 1, the reinforcing fiber yarn and the auxiliary yarn as described above are integrated in a plain weave structure.

Further, Patent Document 2 below discloses a mesh fabric having a main fiber bundle composed of a plurality of strands and an auxiliary fiber bundle entangled with the main fiber bundle. In Patent Document 2, a glass fiber bundle is used as the main fiber bundle. Further, cotton yarn is used as the auxiliary fiber bundle.

Japanese Patent No. 4228497 JP 2007-291590 A

However, in the mesh fabrics of Patent Document 1 and Patent Document 2, both the load (core breaking load) and displacement (punch load after displacement) in the punching test, which are indexes of the concrete peeling prevention characteristics, can be sufficiently increased. There was nothing. If both the load and displacement in the push-out test are not high, cracks will occur with a small load, or the cracked concrete piece will fall off immediately. Therefore, when used as a concrete exfoliation preventive material, the exfoliation of concrete may not be sufficiently prevented.

An object of the present invention is to provide a mesh having excellent punching characteristics that is an index of concrete peeling prevention characteristics, and a concrete peeling prevention material using the mesh.

The mesh according to the present invention is a mesh composed of a plurality of warps and a plurality of wefts, and has a glass composition of ZrO ₂ of 12% by mass or more, and R ₂ O (R is Li, Na and K). A glass fiber bundle containing at least one kind selected from JIS R3420 (2013), and the elongation at break measured according to JIS R3420 (2013) is 4% or more and 35% or less. And a fiber bundle.

In the mesh according to the present invention, the synthetic fiber bundle is preferably a vinylon fiber bundle.

The mesh according to the present invention preferably has a basis weight of 100 g / m ² or more and 450 g / m ² or less.

In the mesh according to the present invention, the basis weight of the glass fiber bundle is 50 g / m ² or more and 250 g / m ² or less, and the basis weight of the synthetic fiber bundle is 30 g / m ² or more and 200 g / m ² or less. It is preferable.

In the mesh according to the present invention, the mass ratio of the synthetic fiber bundle in the mesh is preferably 10% by mass or more and 70% by mass or less.

In the mesh according to the present invention, the volume ratio of the synthetic fiber bundle in the mesh is preferably 20% or more and 80% or less.

In the mesh according to the present invention, the mass ratio of the glass fiber bundle in the mesh is preferably 30% by mass or more and 90% by mass or less.

In the mesh according to the present invention, the volume ratio of the glass fiber bundle in the mesh is preferably 20% or more and 80% or less.

The mesh according to the present invention preferably has a tensile strength of 200 N / 25 mm or more in the direction along the warp and the direction along the weft.

The mesh according to the present invention is preferably made of a woven fabric having an entangled weave.

In the mesh according to the present invention, it is preferable that at least one of the warp and the weft is composed of both the glass fiber bundle and the synthetic fiber bundle.

The mesh according to the present invention is preferably used as a concrete exfoliation preventing material.

The concrete exfoliation preventing material according to the present invention includes a matrix and a mesh configured according to the present invention.

According to the present invention, it is possible to provide a mesh that is excellent in the punching characteristics that serve as an index of the concrete peeling prevention characteristics.

FIG. 1 is a schematic plan view showing a mesh fabric according to the first embodiment of the present invention. FIG. 2 is a schematic plan view showing a mesh fabric according to the second embodiment of the present invention. FIG. 3 is a schematic cross-sectional view showing a concrete exfoliation preventing material according to an embodiment of the present invention. FIG. 4 is a schematic plan view showing mesh fabrics obtained in Examples 1 to 12 and Comparative Example 1. FIG. 5 is a schematic plan view showing the mesh fabric obtained in Examples 13-17. FIG. 6 is a schematic plan view showing the mesh fabric obtained in Examples 18 and 19. FIG. 7 is a schematic plan view showing the mesh fabric obtained in Example 20. FIG. 8 is a schematic plan view showing the mesh fabric obtained in Examples 21 and 22. FIG. FIG. 9 is a schematic plan view showing the mesh fabric obtained in Examples 23 and 24. FIG.

Hereinafter, preferred embodiments will be described. However, the following embodiments are merely examples, and the present invention is not limited to the following embodiments. Moreover, in each drawing, the member which has the substantially the same function may be referred with the same code | symbol.

[mesh]
(First embodiment)
FIG. 1 is a schematic plan view of a mesh according to the first embodiment of the present invention.

As shown in FIG. 1, the mesh according to the first embodiment is a so-called mesh fabric 1 in which a plurality of warps and a plurality of wefts are woven. The mesh fabric 1 is composed of a plurality of warps 2 and a plurality of wefts 3. Each warp 2 has a first strand 2a and a second strand 2b. In the mesh fabric 1, the first strand 2a and the second strand 2b are entangled with each other so as to be twisted, and a plurality of wefts 3 are woven between them. That is, the mesh fabric 1 is a fabric in which the first strand 2a and the second strand 2b constituting the warp yarn 2 and the weft yarn 3 are woven together.

In the present embodiment, the first strand 2a in the warp yarn 2 is a glass fiber bundle. The one glass fiber bundle includes a coating and a plurality of glass fiber monofilaments. The surface of the glass fiber monofilament is covered with a coating. The coating is also present between the glass fiber monofilaments and on the surface of the glass fiber bundle, and also plays a role of bundling a plurality of glass fiber monofilaments. On the other hand, the second strand 2b in the warp yarn 2 is composed of one or a plurality of synthetic fiber bundles. The single synthetic fiber bundle is composed of a plurality of synthetic fiber monofilaments.

In this embodiment, each weft yarn 3 is preferably made of a twisted yarn obtained by twisting a glass fiber bundle and a synthetic fiber bundle. Further, the weft yarn 3 does not have to be a twisted yarn, and may be a non-twisted yarn in which a glass fiber bundle and a synthetic fiber bundle are bundled without being twisted. It may be a woven fabric prepared by preparing two types of glass fiber bundles and synthetic fiber bundles, and each fiber bundle is woven alone. For example, when glass fiber bundles and synthetic fiber bundles are alternately arranged as a plurality of weft threads 3 in the direction in which the warp yarn 2 extends, the arrangement distribution of the glass fiber bundles and the synthetic fiber bundles in the mesh fabric 1 becomes uniform. Therefore, it is preferable. In addition, all the multiple wefts 3 may be comprised only by the glass fiber bundle or the synthetic fiber bundle.

The glass fiber bundle described above contains, as a glass composition, 12% by mass or more of ZrO ₂ and 10% by mass or more of R ₂ O (R is at least one selected from Li, Na and K). Therefore, the mesh fabric 1 is excellent in alkali resistance and flame retardancy.

Moreover, the above-mentioned synthetic fiber bundle has a breaking elongation measured according to JIS R3420 (2013) of 4% or more and 35% or less. If the breaking elongation of the synthetic fiber bundle is too small, the synthetic fiber bundle breaks with the same amount of displacement as that of the glass fiber bundle in the punching test, which is an index of the concrete peeling prevention characteristic. I can't. As a result, the destroyed concrete pieces fall off immediately. On the other hand, if the breaking elongation of the synthetic fiber bundle is too large, the tensile strength of the synthetic fiber bundle becomes small, so that a sufficient load cannot be obtained in the punching test. Therefore, a crack will occur with a small load.

Since the mesh fabric 1 of the present embodiment includes the glass fiber bundle having the above specific composition and the synthetic fiber bundle having the above specific elongation at break, a punching test that serves as an index of the concrete flaking prevention property Thus, both high load and high displacement can be obtained. This is because, in the punching test, the load can be maintained without breaking the synthetic fiber bundle even after the glass fiber bundle having a small breaking elongation is broken. Further, when the synthetic fiber bundle is stretched, it has an effect of peeling the glass fiber bundle from the matrix, and even a glass fiber bundle having a small tensile elongation can take charge without further cutting. In this case, if any of the plurality of warp yarns 2 or the plurality of weft yarns 3 is composed of a glass fiber bundle and a synthetic fiber bundle, this effect is more noticeable.

Thus, since the mesh fabric 1 is excellent in the punching performance (characteristic) that is an index of the concrete peeling prevention characteristic, the reinforcing effect of the concrete structure can be enhanced, and is suitable for the concrete peeling prevention use. Can be used.

In the present invention, the basis weight of the mesh fabric 1 is not particularly limited, but is preferably 100 g / m ² or more and 450 g / m ² or less. When the basis weight of the mesh fabric 1 is not less than the above lower limit, the load and displacement in the punching test can be further increased, and the reinforcing effect on the concrete structure can be further enhanced. On the other hand, when the basis weight of the mesh fabric 1 is not more than the above upper limit, the mesh fabric 1 can be more easily integrated with a resin matrix that constitutes a concrete exfoliation preventing material described later, and the reinforcing effect on the concrete structure can be further enhanced.

From the viewpoint of considering the cost and further enhancing the reinforcing effect on the concrete structure, the basis weight of the mesh fabric 1 is more preferably 150 g / m ² or more, and more preferably 350 g / m ² or less.

The basis weight of the glass fiber bundle constituting the mesh fabric 1 is not particularly limited, but is preferably 50 g / m ² or more and 250 g / m ² or less. When the basis weight of the glass fiber bundle is equal to or higher than the above lower limit, the load in the punching test can be further increased, and the reinforcing effect on the concrete structure can be further enhanced. On the other hand, when the basis weight of the glass fiber bundle is not more than the above upper limit, it is difficult to damage the synthetic fiber bundle due to the breakage of the glass fiber bundle, and the displacement in the push-out test can be further increased. From the viewpoint of further enhancing the punching characteristics, the basis weight of the glass fiber bundle is preferably 80 g / m ² or more, and preferably 200 g / m ² or less.

Moreover, the fabric weight of the synthetic fiber bundle which comprises the mesh fabric 1 is although it does not specifically limit, It is preferable that they are 30 g / m < ² > or more and 200 g / m < ² > or less. When the basis weight of the synthetic fiber bundle is not less than the above lower limit, the displacement in the punching test can be further increased. On the other hand, when the amount is not more than the above upper limit, the load in the punching test can be further increased. From the viewpoint of further improving the punching characteristics, the basis weight of the synthetic fiber bundle is preferably 50 g / m ² or more, and preferably 180 g / m ² or less.

The basis weight of the glass fiber bundle is a value obtained by subtracting the mass of components other than the glass fiber bundle constituting the mesh fabric 1, such as a synthetic fiber bundle and a coating resin described later. The basis weight of the synthetic fiber bundle is a value obtained by subtracting the mass of components other than the synthetic fiber bundle constituting the mesh fabric 1, such as a glass fiber bundle and a coating resin described later. When the mesh fabric 1 is composed of only a glass fiber bundle and a synthetic fiber bundle, the basis weight of the mesh fabric 1 is the sum of the basis weight of the glass fiber bundle, the basis weight of the synthetic fiber bundle, and the coating resin.

From the viewpoint of further improving the punching characteristics, the mass ratio of the synthetic fiber bundle in the mesh fabric 1 is preferably 10% by mass or more and 70% by mass or less. Moreover, it is preferable that the volume ratio of the synthetic fiber bundle in the mesh fabric 1 is 20 volume% or more and 80 volume% or less. In addition, the mass ratio and volume ratio of a synthetic fiber bundle mean the ratio when the mesh fabric 1 whole is 100 mass% or 100 volume%, respectively.

From the viewpoint of further improving the punching characteristics, the mass ratio of the glass fiber bundle in the mesh fabric 1 is preferably 30% by mass or more and 90% by mass or less. Moreover, it is preferable that the volume ratio of the glass fiber bundle in the mesh fabric 1 is 20% or more and 80% or less. In addition, the mass ratio and volume ratio of a glass fiber bundle say the ratio when the mesh fabric 1 whole is 100 mass% or 100%, respectively.

Further, even after reinforcement, from the viewpoint of confirming the concrete structure and from the viewpoint of evenly impregnating the matrix resin described later, the distance between the adjacent warp threads 2 and the distance between the adjacent weft threads 3 are 2 to 10 mm. It is preferable.

Further, from the viewpoint of further increasing the load in the punching test and further improving the punching characteristics of the mesh fabric 1, the tensile strength in the direction along the warp yarn 2 and the direction along the weft yarn 3 is 200 N / 25 mm or more, respectively. Preferably there is. The tensile strength can be measured according to JIS L1096 (2010).

In the mesh fabric 1 of the first embodiment, the plurality of warp yarns 2 and the plurality of weft yarns 3 are constituted by a glass fiber bundle and a synthetic fiber bundle, respectively. However, in the present invention, it is only necessary that at least one of the plurality of warps 2 and the plurality of wefts 3 includes a glass fiber bundle. Moreover, it is sufficient that at least one of the warp yarn 2 and the weft yarn 3 includes a synthetic fiber bundle. Further, it is only necessary that at least one of the plurality of warps 2 and the plurality of wefts 3 includes a glass fiber bundle. Further, it is only necessary that at least one of the plurality of warps 2 and the plurality of wefts 3 includes a synthetic fiber bundle. That is, the mesh fabric 1 should just be provided with the synthetic fiber bundle and the glass fiber bundle.

For example, both the first strand 2a and the second strand 2b may be glass fiber bundles. In that case, the weft 3 should just contain the synthetic fiber bundle at least. Alternatively, both the first strand 2a and the second strand 2b may be a synthetic fiber bundle. In that case, the weft 3 should just contain the glass fiber bundle at least.

In the present invention, the mesh fabric 1 may be further covered with a coating resin. When the mesh fabric 1 is covered with the coating resin, the workability can be further improved. As such a coating resin, for example, an acrylic resin, a vinyl acetate resin, an unsaturated polyester resin, a vinyl ester resin, or the like can be used. When the mesh fabric 1 is covered with the coating resin, the raw material resin can be emulsified and the emulsified resin can be applied to the mesh fabric 1.

(Glass fiber bundle)
The glass fiber bundle contains 12% by mass or more of ZrO ₂ and 10% by mass or more of R ₂ O (R is at least one selected from Li, Na and K) as a glass composition.

As such a glass fiber bundle, for example, as a glass composition, SiO ₂ 54 to 65%, ZrO ₂ 12 to 25%, Li ₂ O 0 to 5%, Na ₂ O 10 to 17%, K in mass%. ₂ O 0-8%, R′O (where R ′ represents Mg, Ca, Sr, Ba, Zn) 0-10%, TiO ₂ 0-7%, Al ₂ O ₃ 0-2% Including, preferably by mass%, SiO ₂ 57-64%, ZrO ₂ 14-24%, Li ₂ O 0.5-3%, Na ₂ O 11-15%, K ₂ O 1-5%, R 'O (where R' represents Mg, Ca, Sr, Ba, Zn) 0.2 to 8%, TiO ₂ 0.5 to 5%, Al ₂ O ₃ 0 to 1% is used. be able to.

Mesh Thus, the present invention has a glass composition, because it contains a glass fiber bundle containing a ZrO ₂ or 12 wt%, is excellent in alkali resistance. Therefore, it is difficult for the mesh to be eroded by alkali components present in cement or the like. Accordingly, it is possible to prevent the mesh from being deteriorated.

However, glass containing 12% by mass or more of ZrO ₂ is difficult to melt, but in the present invention, it further contains 10% by mass or more of R ₂ O, and thus contains 12% by mass or more of ZrO _2. Is also excellent in meltability. Note that the _{R 2} O is 10 wt% or more, _Li 2 O in the glass fiber bundles in, the total content of Na ₂ O and _{K 2} O, refers to at least 10 mass%.

In the first embodiment, the glass fiber bundle can be bundled, for example, from several tens to several hundreds. The glass fiber bundle is obtained by applying a sizing agent to the surface of the glass fiber, converging it, and drying the sizing agent. The dried sizing agent becomes a film covering the surface of the glass fiber.

Examples of the resin constituting such a coating include polyester resin. The polyester resin may be a saturated polyester resin or an unsaturated polyester resin. Further, vinyl acetate resin and urethane resin may be used.

The count of the glass fiber bundle is not particularly limited, but is preferably 100 to 3000 tex. When the count of the glass fiber bundle is within the above range, the punching property of the mesh fabric can be further enhanced, and the reinforcing effect on the concrete structure can be further enhanced.

(Synthetic fiber bundle)
The synthetic fiber bundle has a breaking elongation measured according to JIS R3420 (2013) of 4% or more and 35% or less. Examples of such a synthetic fiber bundle include a vinylon fiber bundle, a polyester fiber bundle, a polypropylene fiber bundle, and a nylon fiber bundle. Among these, a vinylon fiber bundle is preferable from the viewpoint of further increasing the load in the punching test and further improving the punching characteristics.

In the first embodiment, the synthetic fiber bundle may be a bundle of a plurality of synthetic fiber monofilaments or a single synthetic fiber.

The count of the synthetic fiber bundle is not particularly limited, but is preferably 100 to 3000 tex. When the count of the synthetic fiber bundle is within the above range, the punching characteristics of the mesh fabric can be further enhanced, and the reinforcing effect on the concrete structure can be further enhanced.

Hereinafter, an example of a method for manufacturing the mesh fabric 1 will be described.

(Production method)
It does not specifically limit as a manufacturing method of the mesh fabric 1, It can manufacture with the following method as an example.

First, the glass raw material put in the glass melting furnace is melted to form molten glass, and after the molten glass is made into a homogeneous state, the molten glass is drawn out from a heat-resistant nozzle attached to the bushing. Thereafter, the drawn molten glass is cooled to form a glass fiber monofilament (glass fiber).

Next, a sizing agent for forming a film is applied to the surface of the glass fiber. In a state where the sizing agent is evenly applied, several hundred to several thousand glass fibers are drawn and bundled, and dried to obtain a glass fiber bundle.

The sizing agent preferably contains a solvent such as water, a polyester resin such as a saturated polyester resin or an unsaturated polyester resin, or a vinyl acetate resin or a urethane resin. These resins are preferably in an emulsion state.

In addition, the sizing agent may contain, for example, a silane coupling agent. Specific examples of the silane coupling agent include amino silane, epoxy silane, vinyl silane, acrylic silane, chloro silane, mercapto silane, and ureido silane. In addition, the effect which protects the surface of a glass fiber bundle arises by adding a silane coupling agent, and mechanical strength, such as tensile strength, can be improved further. In the present invention, vinyl silane or aminosilane is preferred because it is necessary to impregnate with unsaturated polyester resin that is cured by radical polymerization, vinyl ester resin, or impregnation with various resins.

Further, the sizing agent can contain components such as a lubricant, a nonionic surfactant or an antistatic agent in addition to the silane coupling agent described above.

The obtained glass fiber bundle is used as the first strand 2a, and the warp yarn 2 is formed by entanglement with the synthetic fiber bundle as the second strand 2b prepared in advance. Further, the weft yarn 3 is formed by twisting a separately prepared glass fiber bundle and a separately prepared synthetic fiber bundle by the above method. By weaving the weft yarn 3 into the warp yarn 2, a mesh fabric 1 woven by entanglement weaving can be obtained.

Note that, as described above, the mesh fabric 1 may be further covered with a coating resin. In that case, a coating resin raw material such as an acrylic resin, an unsaturated polyester resin, or a vinyl ester resin is applied to the mesh fabric 1 by a dipping method or a spray method, and a crossing portion of the warp yarn 2 and the weft yarn 3 is processed. In this case, the form of the resin raw material may be either a resin emulsion or a solvent-based resin.

Then, the resin applied to the mesh fabric 1 is dried. In addition, before making it dry, a mesh may be pressed with a pair of squeeze roller, for example, and resin applied excessively may be squeezed out. In the case of drying, when the resin emulsion is used, water is evaporated at a temperature of 100 to 120 ° C., and in the case of a solvent-based resin, the main purpose is to dry the contained solvent, so that excessive curing is not promoted. It is preferable to dry at a temperature of 40 to 80 ° C.

Further, in addition to the method of covering with a coating resin and sealing, the warp thread 2 or the weft thread 3 may be mixed with a heat-fusible thread and hot-pressed for sealing. As the heat-fusible yarn, it is preferable to use a yarn having a glass transition temperature of 150 ° C. or lower because it can be sealed by hot pressing at a low temperature.

(Second Embodiment)
FIG. 2 is a schematic plan view showing a mesh according to the second embodiment of the present invention.

As shown in FIG. 2, the mesh fabric 21 is configured by plain weaving of the warp yarn 4 and the weft yarn 5. The warp yarn 4 is composed of a glass fiber bundle 4a and a synthetic fiber bundle 4b. The glass fiber bundle 4a and the synthetic fiber bundle 4b are alternately arranged in the direction in which the weft 5 extends. Moreover, the weft 5 is comprised by the glass fiber bundle 5a and the synthetic fiber bundle 5b. The glass fiber bundles 5a and the synthetic fiber bundles 5b are alternately arranged in the direction in which the warp yarn 4 extends. Other points are the same as in the first embodiment.

Since the mesh fabric 21 of the second embodiment also includes the glass fiber having the specific composition and the synthetic fiber bundle having the specific breaking elongation, the mesh fabric 21 is a punch that serves as an index of the concrete flaking prevention property. In the test, both high loads and high displacements can be obtained. Thus, since the mesh fabric 21 is excellent in the punching characteristics that serve as an index of the concrete peeling prevention characteristic, the reinforcing effect of the concrete structure can be enhanced and can be suitably used for concrete peeling prevention. .

As the mesh of the present invention, not only the entangled weave and the plain weave as in the first and second embodiments, but also a weave woven fabric can be used. However, the mesh of the present invention may be a braided fabric, and the method for creating the mesh is not particularly limited. Among these, imitation weaving is preferable. In the pattern weaving, since one warp or one weft is composed of three strands, the area of the contact point between the warp and the weft is increased, and it is easy to check. Thereby, it becomes difficult to unravel the mesh.

In the first and second embodiments, the warp yarn and the weft yarn are both composed of both glass fiber bundles and synthetic fiber bundles. However, in the present invention, all warp yarns are only glass fiber bundles or synthetic fibers. It is comprised only by the bundle, and all the wefts may be comprised only by the fiber bundle different from the warp. However, in concrete peeling prevention applications, loads are applied from the direction perpendicular to the mesh surface direction (vertical direction). From the viewpoint of dispersing the load from the vertical direction, all warp yarns and all weft yarns are all glass fibers. It is preferable to be constituted by both a bundle and a synthetic fiber bundle.

[Concrete peeling prevention material]
FIG. 3 is a schematic cross-sectional view showing a concrete exfoliation preventing material according to an embodiment of the present invention. As shown in FIG. 3, the concrete exfoliation preventing material 10 includes a mesh fabric 1 and a matrix 12. The mesh fabric 1 is the mesh fabric of the first embodiment described above. The mesh fabric 1 is embedded in the matrix 12. In addition, as shown in FIG. 3, the concrete peeling prevention material 10 can be affixed and used for the concrete frame 13, for example.

Thus, in the concrete peeling prevention material 10, since the mesh fabric 1 excellent in the punching property is embedded in the matrix 12, the reinforcing effect of the concrete can be enhanced and the concrete peeling is effectively prevented. be able to.

The material of the matrix 12 is not particularly limited, and for example, a resin matrix made of epoxy resin, acrylic resin, urethane resin, or the like can be used. These may be used alone or in combination. In the present invention, the matrix may not be a resin, and may be a cement, for example. In any case, since the mesh fabric 1 is excellent in the punching property, the reinforcing effect of the concrete can be enhanced, and the peeling of the concrete can be effectively prevented.

Hereinafter, the present invention will be described in more detail based on specific examples. The present invention is not limited to the following examples, and can be implemented with appropriate modifications without departing from the scope of the invention.

(Examples 1 to 12)
First, SiO ₂ 57.9 mass%, ZrO ₂ 17.2 mass%, Li ₂ O 0.5 mass%, Na ₂ O 14.8 mass%, K ₂ O 1.3 mass%, CaO 0.9 mass. %, And a raw material was prepared so as to have a glass composition of 7.4% by mass of TiO ₂ , and glass fibers were drawn from the molten molten glass from a bushing having several hundred to several thousand nozzles.

Next, a sizing agent in which vinyl silane, saturated polyester resin, and a lubricant are dispersed in water is prepared and applied to the surface of the obtained glass fiber by an applicator so that the loss on ignition is 0.8% by mass. And after bundling glass fiber, the glass fiber bundle was manufactured by drying a sizing agent.

Next, a mesh fabric 31 shown in FIG. 4 was produced. Specifically, the warp yarn 32 was produced by intertwining the glass fiber bundle 32a obtained as described above and the synthetic fiber bundle 32b prepared in advance. Next, the weft yarn 33 was produced by twisting the glass fiber bundle 33a separately prepared as described above and the synthetic fiber bundle 33b. By weaving the weft thread 33 into the warp thread 32, a mesh fabric 31 woven by entanglement weaving was obtained. Details of materials constituting the mesh fabric 31 obtained in Examples 1 to 12 are shown in Tables 1 and 2 below. In Examples 1 to 7 and Examples 9 to 12, vinylon fiber (breaking elongation: 9.5%) was used as the synthetic fiber bundle. In Examples 4 and 12, a synthetic fiber bundle obtained by twisting two vinylon fiber bundles was used. In Example 8, a polypropylene fiber (PP, elongation at break: 30%) was used as a synthetic fiber bundle.

(Examples 13 to 17)
In Examples 13 to 17, a mesh fabric 41 shown in FIG. 5 was produced. Specifically, a warp yarn 42 was produced by intertwining a glass fiber bundle 42a obtained in the same manner as in Example 1 and a synthetic fiber bundle 42b prepared in advance. Separately, a glass fiber bundle 43 a prepared in the same manner as in Example 1 and a synthetic fiber bundle 43 b separately prepared were used as the weft yarn 43. By weaving the weft thread 43 into the warp thread 42, a mesh fabric 41 woven by entanglement weaving was obtained. In the mesh fabric 41, the glass fiber bundles 43a and the synthetic fiber bundles 43b as the weft threads 43 are alternately arranged in the direction in which the warp threads 42 extend. Details of materials constituting the mesh fabric 41 obtained in Examples 13 to 17 are shown in Tables 1 and 2 below. In the warps of Examples 13 to 15 and Examples 16 and 17, vinylon fiber (breaking elongation: 9.5%) was used as a synthetic fiber bundle. In the weft yarns of Examples 16 and 17, polypropylene fibers (PP, breaking elongation: 30%) were used as the synthetic fiber bundle.

(Examples 18 and 19)
In Examples 18 and 19, a mesh fabric 51 shown in FIG. 6 was produced. Specifically, two fiberglass bundles obtained in the same manner as in Example 1 were entangled to produce a warp yarn 52. A separately prepared synthetic fiber bundle was used as the weft yarn 53. By weaving the weft yarn 53 into the warp yarn 52, a mesh fabric 51 woven by entanglement weaving was obtained. Details of materials constituting the mesh fabric 51 obtained in Examples 18 and 19 are shown in Tables 1 and 2 below. In Example 18, vinylon fiber (breaking elongation: 9.5%) was used as the synthetic fiber bundle, and in Example 19, polypropylene fiber (PP, breaking elongation: 30%) was used as the synthetic fiber bundle.

(Example 20)
In Example 20, the mesh fabric 61 shown in FIG. 7 was produced. Specifically, two pre-prepared vinylon fiber bundles (breaking elongation: 9.5%) were entangled to produce warp yarn 62. Further, a glass fiber bundle obtained in the same manner as in Example 1 was used as the weft thread 63. By weaving the weft thread 63 into the warp thread 62, a mesh fabric 61 woven by entanglement weaving was obtained. Details of materials constituting the mesh fabric 61 obtained in Example 20 are shown in Tables 1 and 2 below.

(Example 21)
In Example 21, a mesh fabric 71 shown in FIG. 8 was produced. Specifically, a glass fiber bundle 72a obtained in the same manner as in Example 1 and a vinylon fiber bundle (breaking elongation: 9.5%) as a synthetic fiber bundle 72b prepared in advance were used as the warp yarn 72. . Separately, a glass fiber bundle 73a obtained in the same manner as in Example 1 and a vinylon fiber bundle (breaking elongation: 9.5%) as a synthetic fiber bundle 73b prepared in advance were used as the weft yarn 73. The mesh fabric 71 was obtained by plain weaving the warp yarn 72 and the weft yarn 73. In addition, the glass fiber bundle 72a and the synthetic fiber bundle 72b were alternately arranged in the direction along the weft 73. Further, the glass fiber bundle 73 a and the synthetic fiber bundle 73 b were alternately arranged in the direction along the warp yarn 72. Details of materials constituting the mesh fabric 71 obtained in Example 21 are shown in Tables 1 and 2 below.

(Example 22)
In Example 22, as the synthetic fiber bundle 72b constituting the warp yarn 72, a polypropylene fiber bundle (PP, breaking elongation: 30%) prepared in advance instead of the vinylon fiber bundle was used. Thus, a mesh fabric 71 was produced. Details of materials constituting the mesh fabric 71 obtained in Example 22 are shown in Tables 1 and 2 below.

(Examples 23 and 24)
In Examples 23 and 24, a mesh fabric 81 shown in FIG. 9 was produced. Specifically, glass fiber bundles 82a1 and 82a3 obtained in the same manner as in Example 1 and synthetic fiber bundle 82a2 were used as warp yarns 82a. The glass fiber bundle 82b2 obtained in the same manner as in Example 1 and the synthetic fiber bundles 82b1 and 82b3 were used as the warp yarn 82b.

Further, glass fiber bundles 83a1 and 83a3 obtained in the same manner as in Example 1 and synthetic fiber bundle 83a2 were used as weft yarn 83a. The glass fiber bundle 83b2 obtained in the same manner as in Example 1 and the synthetic fiber bundles 83b1 and 83b3 were used as the weft yarn 83b. The mesh fabric 81 was obtained by weaving the warp yarn 82a, the warp yarn 82b, the weft yarn 83a, and the weft yarn 83b.

In addition, the warp yarn 82a and the warp yarn 82b were alternately arranged in the direction along the weft yarn 83a. In the warp yarn 82a, the glass fiber bundle 82a1, the synthetic fiber bundle 82a2, and the glass fiber bundle 82a3 are arranged in this order in the direction along the weft yarn 83a. On the other hand, in the warp yarn 82b, the synthetic fiber bundle 82b1, the glass fiber bundle 82b2, and the synthetic fiber bundle 82b3 are arranged in this order in the direction along the weft yarn 83a.

Further, the weft yarns 83a and the weft yarns 83b were alternately arranged in the direction along the warp yarn 82a. In the weft yarn 83a, the glass fiber bundle 83a1, the synthetic fiber bundle 83a2, and the glass fiber bundle 83a3 are arranged in this order in the direction along the warp yarn 82a. In the weft yarn 83b, the synthetic fiber bundle 83b1, the glass fiber bundle 83b2, and the synthetic fiber bundle 83b3 are arranged in this order in the direction along the warp yarn 82a. Details of materials constituting the mesh fabric 81 obtained in Examples 23 and 24 are shown in Tables 1 and 2 below. In Examples 23 and 24, polypropylene fibers (PP, elongation at break: 30%) were used as the synthetic fiber bundle.

(Comparative Example 1)
In Comparative Example 1, a mesh fabric 31 was obtained in the same manner as in Example 1 except that polypropylene fibers (PP, breaking elongation: 40%) were used as the synthetic fiber bundle.

(Comparative Example 2)
In Comparative Example 2, a warp yarn was produced by intertwining two glass fiber bundles obtained in the same manner as in Example 1. Next, in the same manner as in Example 1, two separately prepared glass fiber bundles were twisted to produce weft yarns. By weaving the weft yarn into the warp yarn, a mesh fabric consisting only of glass fiber bundles woven by entanglement weave was obtained. Details of materials constituting the mesh fabric obtained in Comparative Example 2 are shown in Tables 1 and 2 below.

(Comparative Example 3)
In Comparative Example 3, a warp yarn was produced by intertwining two synthetic fiber bundles prepared in advance. Next, two synthetic fiber bundles prepared separately were twisted to produce weft yarns. By weaving the weft yarn into the warp yarn, a mesh fabric consisting only of a synthetic fiber bundle woven by entanglement weave was obtained. Details of materials constituting the mesh fabric obtained in Comparative Example 3 are shown in Tables 1 and 2 below. In Comparative Example 3, polypropylene fibers (PP, elongation at break: 30%) were used as the synthetic fiber bundle.

(Sample characteristic evaluation)
Tensile strength;
The tensile strength of warp and weft in the mesh fabrics obtained in Examples 1 to 24 and Comparative Examples 1 to 3 was measured according to JIS L1096 (2010). Specifically, five test pieces each having a width of 25 mm and a length of 200 mm were collected from the mesh fabric in each of the vertical direction and the horizontal direction. The test was performed using an autograph (manufactured by Shimadzu Corporation) under measurement conditions of a span (grip interval) of 100 mm and a tensile speed of 50 mm / min. The results are shown in Table 2 below.

Punching test (punching performance);
The push-out test of the mesh fabric obtained in Examples 1 to 24 and Comparative Examples 1 to 3 was issued in July 2015 by East Japan Expressway Co., Ltd., Central Japan Expressway Co., Ltd., and West Japan Expressway Co., Ltd. NEXCO Test Method Vol. 7 Tunnel-Related Test Method Test method 734 was performed. The punching load when the core breaks (core breaking load) and the punching load when displaced by 5 mm, 10 mm, and 20 mm are shown in Table 2 below.

From Tables 1 and 2, at least one of the warp and the weft is configured, and as a glass composition, ZrO ₂ is 12% by mass or more, and R ₂ O (R is at least 1 selected from Li, Na and K) Comprising at least one of a glass fiber bundle, warp and weft containing 10% by mass or more of a seed), and the elongation at break measured according to JIS R3420 (2013) is 4% or more, The mesh fabric provided with a synthetic fiber bundle that is 35% or less had high tensile strength and good punch test results. On the other hand, in the mesh fabrics of Comparative Examples 1 to 3, any one of the results of the core breaking load, the displacement of 5 mm, the displacement of 10 mm, and the displacement of 20 mm was not sufficient in the punching test.

1, 21, 31, 41, 51, 61, 71, 81 ...

mesh fabric

2, 4, 32, 42, 52, 62, 72, 82a, 82b ...

warp yarns

2a, 2b ... first and

second strands

4a, 5a, 32a, 33a, 42a, 43a, 72a, 73a, 82a1, 82a3, 82b2, 83a1, 83a3, 83b2 ...

Glass fiber bundles

4b, 5b, 32b, 33b, 42b, 43b, 72b, 73b, 82a2, 82b1, 82b3 , 83a2, 83b1, 83b3 ...

synthetic fiber bundles

3, 5, 33, 43, 53, 63, 73, 83a, 83b ... weft thread 10 ... concrete peeling prevention material 12 ... matrix 13 ... concrete frame

Claims

A mesh composed of a plurality of warps and a plurality of wefts,
A glass fiber bundle containing 12% by mass or more of ZrO 2 and 10% by mass or more of R 2 O (R is at least one selected from Li, Na and K) as a glass composition;
A synthetic fiber bundle having a breaking elongation measured according to JIS R3420 (2013) of 4% or more and 35% or less;
With a mesh.
The mesh according to claim 1, wherein the synthetic fiber bundle is a vinylon fiber bundle.
The mesh according to claim 1 or 2, wherein the basis weight is 100 g / m 2 or more and 450 g / m 2 or less.
The basis weight of the glass fiber bundle is 50 g / m 2 or more and 250 g / m 2 or less,
The mesh according to any one of claims 1 to 3, wherein the weight of the synthetic fiber bundle is 30 g / m 2 or more and 200 g / m 2 or less.
The mesh according to any one of claims 1 to 4, wherein a mass ratio of the synthetic fiber bundle in the mesh is 10% by mass or more and 70% by mass or less.
The mesh according to any one of claims 1 to 5, wherein a volume ratio of the synthetic fiber bundle in the mesh is 20% or more and 80% or less.
The mesh according to any one of claims 1 to 6, wherein a mass ratio of the glass fiber bundle in the mesh is 30% by mass or more and 90% by mass or less.
The mesh according to any one of claims 1 to 7, wherein a volume ratio of the glass fiber bundle in the mesh is 20% or more and 80% or less.
The mesh according to any one of claims 1 to 8, wherein the tensile strength in the direction along the warp and the direction along the weft is 200 N / 25 mm or more, respectively.
The mesh according to any one of claims 1 to 9, wherein the mesh is made of a woven fabric with an entangled weave.
The mesh according to any one of claims 1 to 10, wherein at least one of the warp and the weft is composed of both the glass fiber bundle and the synthetic fiber bundle.
The mesh according to any one of claims 1 to 11, which is used as a cocrete exfoliation preventing material.
Matrix,
A mesh according to any one of claims 1 to 12,
A concrete peeling prevention material.