WO2019150894A1

WO2019150894A1 - Mesh and material for preventing peeling-off of concrete

Info

Publication number: WO2019150894A1
Application number: PCT/JP2019/000334
Authority: WO
Inventors: 真治西堀
Original assignee: 日本電気硝子株式会社
Priority date: 2018-02-05
Filing date: 2019-01-09
Publication date: 2019-08-08
Also published as: JP7047426B2; JP2019135338A

Abstract

Provided are: a mesh having excellent punching characteristics which serve as an indication of the capability of preventing peeling-off of concrete; and a material for preventing peeling-off of concrete with the use of the mesh. The mesh (1) is composed of fiber bundles extended along multiple directions, wherein the fiber bundles comprise glass fiber bundles and synthetic fiber bundles having a tensile strength of 2000 MPa or greater and the ratio by volume of the glass fiber bundles to the sum of the glass fiber bundles and the synthetic fiber bundles is 20-95% inclusive.

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 frame is known as a measure for preventing the peeling of the concrete frame such as a building or a tunnel. As the reinforcing material, an anti-peeling material in which a mesh such as glass fiber or synthetic resin is embedded in cement mortar or resin is used.

The following Patent Document 1 discloses a mesh used as a reinforcing material for a concrete frame. The mesh of Patent Document 1 is a mesh fabric in which a main fiber bundle composed of a plurality of strands is woven. The mesh fabric has an auxiliary fiber bundle entangled with a main fiber bundle, and is configured by impregnating the auxiliary fiber bundle with a resin. Specifically, in the example of Patent Document 1, a mesh fabric is produced by entwining a cotton fiber, which is an auxiliary fiber bundle, with a glass fiber bundle, which is a main fiber bundle, and an acrylic resin is applied to the obtained mesh fabric by an immersion method. An impregnated mesh fabric is described.

JP 2007-291590 A

However, in the mesh fabric of Patent Document 1, both the load and displacement in the punching test, which is an index of the concrete peeling prevention property, may not be sufficiently increased. Thus, if both the load and displacement in the punching test cannot be sufficiently increased, the reinforcing effect of the concrete frame may not be sufficiently obtained. Moreover, when used as a concrete exfoliation preventing material, cracks may occur in the concrete frame with a small load, or the cracked concrete pieces may fall off immediately. Therefore, peeling of concrete may not be sufficiently prevented. In order to efficiently reinforce the concrete frame, it is necessary to increase both the load and displacement in the punching test.

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 fiber bundles extending in a plurality of directions, and includes a glass fiber bundle and a synthetic fiber bundle having a tensile strength of 2000 MPa or more, and the glass A volume ratio of the glass fiber bundle to a sum of volumes of the fiber bundle and the synthetic fiber bundle is 20% or more and 95% or less.

In addition, the tensile strength in the above is calculated | required by dividing the tensile strength (N / tex) measured based on JISL1015 (2010) by the specific gravity of a synthetic fiber.

In the mesh according to the present invention, the tensile elongation of the synthetic fiber bundle measured according to JIS L1015 (2010) is preferably 2% or more and 10% or less.

In the mesh according to the present invention, the basis weight is preferably 100 g / m ² or more and 900 g / m ² or less.

The mesh according to the present invention is preferably composed of a plurality of warps and a plurality of wefts.

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

In the mesh according to the present invention, the warp yarn and the weft yarn include both the glass fiber bundle and the synthetic fiber bundle, respectively, and a ratio between the number of the synthetic fiber bundles and the number of the glass fiber bundles in the warp yarn ( Synthetic fiber bundle) / (glass fiber bundle) is 0.5 or more and 2.0 or less, and the ratio of the number of the synthetic fiber bundles to the number of the glass fiber bundles in the weft yarn (synthetic fiber bundle) / ( The glass fiber bundle) is preferably 0.5 or more and 2.0 or less.

In the mesh according to the present invention, the glass fiber bundle preferably has a plurality of glass fiber monofilaments and a coating covering the surface of the glass fiber monofilament.

In the mesh according to the present invention, the glass fiber monofilament preferably has an average diameter of 10 μm or more and 30 μm or less.

In the mesh according to the present invention, the loss on ignition of the glass fiber bundle after being immersed in a styrene monomer at 25 ° C. for 1 hour is 20% or more lower than the loss on ignition of the glass fiber bundle before immersion. preferable.

In the mesh according to the present invention, it is preferable that the coating contains a silane coupling agent.

In the mesh according to the present invention, the glass fiber bundle and the synthetic fiber bundle are preferably sealed with heat-sealing yarns.

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 is characterized by comprising a matrix and a mesh configured according to the present invention.

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

FIG. 1 is a schematic plan view showing a mesh according to the first embodiment of the present invention. Fig.2 (a) is typical sectional drawing for demonstrating a behavior when a punching test is done using the mesh which concerns on the 1st Embodiment of this invention. Moreover, FIG.2 (b) is typical sectional drawing which expands and shows the part in which the mesh is provided in Fig.2 (a). FIG. 3A is a schematic cross-sectional view for explaining the behavior when a punching test is performed using a mesh made of only a synthetic fiber bundle as a comparative example. Moreover, FIG.3 (b) is typical sectional drawing which expands and shows the part in which the mesh is provided in Fig.3 (a). FIG. 4A is a schematic cross-sectional view for explaining the behavior when a punching test is performed using a mesh made of only a glass fiber bundle as a comparative example. Moreover, FIG.4 (b) is a schematic diagram which expands and shows the part in which the mesh is provided in Fig.4 (a). FIG. 5 is a schematic plan view showing a mesh according to the second embodiment of the present invention. FIG. 6 is a schematic cross-sectional view showing a concrete exfoliation preventing material according to an embodiment of the present invention. FIG. 7 is a schematic plan view showing the meshes obtained in Examples 1, 2, 5 to 11. FIG. 8 is a schematic plan view showing the meshes obtained in Examples 3, 4, and 12.

Hereinafter, preferred embodiments will be described. However, the following embodiments are merely examples, and the present invention is not limited to the following embodiments. In the drawings, members having substantially the same function may be referred to by the same reference numerals.

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

As shown in FIG. 1, the mesh 1 according to the first embodiment is a mesh fabric in which a plurality of warps 2 and a plurality of wefts 3 are woven. Accordingly, the mesh 1 is composed of a plurality of warp yarns 2 and a plurality of weft yarns 3.

The plurality of warps 2 each have a first strand 2a and a second strand 2b. In the mesh 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 1 is a woven 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 mesh 1, the first strand 2a constituting the warp yarn 2 is constituted by one glass fiber bundle. Further, the second strand 2b constituting the warp yarn 2 is constituted by one synthetic fiber bundle. But the 1st strand 2a may be comprised by the several glass fiber bundle, and the 2nd strand 2b may be comprised by the several synthetic fiber bundle. Moreover, while the 1st strand 2a is comprised with the glass fiber bundle and the synthetic fiber bundle, the 2nd strand 2b may be comprised with the glass fiber bundle and the synthetic fiber bundle. Furthermore, the warp yarn 2 in which the first strand 2a and the second strand 2b are constituted by a synthetic fiber bundle, and the warp yarn 2 in which the first strand 2a and the second strand 2b are constituted by a glass fiber bundle are used. It may be used.

The plurality of weft yarns 3 are preferably each composed of a twisted yarn obtained by twisting a glass fiber bundle and a synthetic fiber bundle. However, the weft yarn 3 may not 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.

Further, the plurality of weft threads 3 may be composed only of glass fiber bundles, or may be composed only of synthetic fiber bundles. Among them, it is preferable to prepare two types of weft yarns 3 made of glass fiber bundles and weft yarns 3 made of synthetic fiber bundles, and these two types of weft yarns 3 are alternately arranged along the direction in which the warp yarn 2 extends. . In this case, the distribution of the glass fiber bundle and the synthetic fiber bundle in the mesh 1 can be made even more uniform.

In the mesh 1 of the present embodiment, the warp yarn 2 and the weft yarn 3 are each composed of both a glass fiber bundle and a synthetic fiber bundle. However, in the present invention, it is only necessary that at least one of the warp yarn 2 and the weft yarn 3 includes a glass fiber bundle, and at least one of the warp yarn 2 and the weft yarn 3 includes a synthetic fiber bundle. That is, the mesh 1 should just contain the glass fiber bundle and the synthetic fiber bundle.

In addition, from the viewpoint of further increasing both the load and the displacement in the push-out test, it is preferable that at least one of the warp yarn 2 and the weft yarn 3 includes both a glass fiber bundle and a synthetic fiber bundle. More preferably, the warp yarn 2 and the weft yarn 3 each include both a glass fiber bundle and a synthetic fiber bundle.

In this embodiment, the tensile strength of the synthetic fiber bundle constituting the mesh 1 is 2000 MPa or more. The tensile strength of the synthetic fiber bundle can be measured in accordance with JIS L1015 (2010). The unit of tensile strength in this embodiment is MPa, whereas the unit of tensile strength in JIS L1015 (2010) is N / tex. The unit can be converted by dividing the tensile strength in JIS L1015 (2010) by the specific gravity of the synthetic fiber constituting the synthetic fiber bundle.

The tensile strength of the synthetic fiber bundle is preferably 2500 MPa or more, more preferably 3000 MPa or more, preferably 5000 MPa or less, more preferably 4000 MPa or less. When the tensile strength of the synthetic fiber bundle is not less than the above lower limit value, the load can be further increased in the punching test. When the tensile strength of the synthetic fiber bundle is not more than the above upper limit value, the displacement can be further increased in the punching test.

Further, the volume ratio of the glass fiber bundle to the sum of the volume of the glass fiber bundle and the synthetic fiber bundle (the volume of the glass fiber bundle / the sum of the volumes of the glass fiber bundle and the synthetic fiber bundle) is 20% or more and 95%. It is as follows. In addition, when deposits, such as coating resin, have adhered to the mesh 1, the volume of deposits is not taken into consideration.

As described above, the mesh 1 includes the synthetic fiber bundle having the specific tensile strength, and the volume ratio of the glass fiber bundle is within the specific range. A sufficient load and displacement can be obtained in the punching test.

In addition, when the warp yarn 2 and the weft yarn 3 each include both a glass fiber bundle and a synthetic fiber bundle, the ratio of the number of synthetic fiber bundles to the number of glass fiber bundles in the warp yarn 2 (synthetic fiber bundle) / ( The glass fiber bundle) is preferably 0.5 or more and 2.0 or less, more preferably 0.8 or more and 1.2 or less. Further, the ratio (synthetic fiber bundle) / (glass fiber bundle) between the number of synthetic fiber bundles and the number of glass fiber bundles in the weft 3 is preferably 0.5 or more and 2.0 or less, more preferably. 0.8 or more and 1.2 or less. When the ratio (synthetic fiber bundle) / (glass fiber bundle) is within the above range, the load and displacement in the punching test can be further increased.

Hereinafter, the reason why a sufficient load and displacement can be obtained when a punching test is performed using the mesh 1 will be described.

2 (a) and 2 (b) show the behavior when the sheet 6 using the mesh 1 is attached to the concrete frame 7 and the punching test is performed. Although details will be described later, the sheet 6 is composed of a mesh 1 and a matrix resin 8 as shown in FIG. The sheet 6 is obtained by impregnating the mesh 1 with the matrix resin 8.

Since the mesh 1 includes a synthetic fiber bundle having high tensile strength, the tensile strength of the sheet 6 is high. Thus, since the tensile strength of the sheet 6 using the mesh 1 is high, the sheet 6 can withstand the shearing stress at the time of punching. That is, the punching load is high. In particular, as shown in FIG. 2A, the punching load after the sheet 6 is partially peeled from the concrete housing 7 increases.

Further, the glass fiber bundle is excellent in adhesiveness with the matrix resin 8. When the shear stress at the time of punching becomes larger than the adhesive force of the sheet 6 to the concrete housing 7, a part of the sheet 6 is peeled from the concrete housing 7 as shown in FIG. Since the adhesive force between the glass fiber bundle and the matrix resin 8 is large, the glass fiber bundle does not slip through the matrix resin 8 even when the sheet 6 is peeled off, and the glass fiber bundle is bonded to the matrix resin 8. Therefore, even after a part of the sheet 6 is peeled from the concrete housing 7, the sheet 6 can maintain the tensile strength, so that the punching displacement can be increased. Therefore, in the sheet 6 using the mesh 1, a high punching load and displacement can be obtained.

On the other hand, FIGS. 3 (a) and 3 (b) show the behavior when a sheet 106 using a mesh 101 made only of a synthetic fiber bundle is attached to a concrete case 107 and a punch test is performed as a comparative example. ing. As shown in FIG. 3B, the sheet 106 includes a mesh 101 and a matrix resin 108.

As shown in FIG. 3 (b), the matrix resin 108 is bonded to the concrete housing 107, but has a low adhesive force to the mesh 101. Therefore, as shown in FIG. 3 (a), when a part of the sheet 106 is peeled off from the concrete casing 107 due to the shear stress at the time of punching, the mesh 101 slips out of the matrix resin 108 as shown in FIG. 3 (b). . When the mesh 101 slips through, the tensile strength of the sheet 106 decreases, and the punching load cannot be sufficiently increased. Further, since the tensile strength of the sheet 106 is lowered, a sufficient punching displacement cannot be obtained.

On the other hand, in FIG. 4 (a) and (b), as a comparative example, the behavior when a sheet 116 using a mesh 111 made of only glass fiber bundles is attached to a concrete case 117 and a punching test is performed is shown. ing. As shown in FIG. 4B, the sheet 116 includes a mesh 111 and a matrix resin 118.

As shown in FIGS. 4A and 4B, when a punching test is performed using a mesh 111 made of only a glass fiber bundle, the mesh 111 is easily broken and the sheet 116 itself is easily broken. Although the glass fiber bundle has good adhesion to the matrix resin 118, the tensile strength of the glass fiber bundle is not sufficient with respect to the shearing stress at the time of punching, so the sheet 116 is not peeled from the concrete housing 117. It is considered that sufficient punching load and punching displacement cannot be obtained because the mesh 111 is broken.

As described above, in the present embodiment, the tensile strength of the sheet 6 is increased by using the mesh 1 including the glass fiber bundle excellent in adhesiveness with the matrix resin 8 and the synthetic fiber bundle having high tensile strength. And is excellent in adhesiveness with the matrix resin 8. As a result, even if the sheet 6 peels while withstanding the shear stress at the time of punching, the tensile strength can be maintained, so that a high punching load and displacement can be obtained.

When the volume ratio of the glass fiber bundle to the sum of the volumes of the glass fiber bundle and the synthetic fiber bundle is less than 20%, the adhesiveness between the mesh 1 and the matrix resin 8 is low, and the mesh 1 slips out of the matrix resin 8. . Further, when the volume ratio of the glass fiber bundle exceeds 95%, the mesh 1 is broken.

When the mesh 1 has a volume ratio of the glass fiber bundle of 20% or more and 95% or less, a sufficient load and displacement can be reliably obtained in the punching test.

From the viewpoint of further increasing the load and displacement in the punching test, the volume ratio of the glass fiber bundle to the sum of the volumes of the glass fiber bundle and the synthetic fiber bundle is preferably 25% or more, preferably 85% or less, and more Preferably it is 50% or more, preferably 80% or less.

The basis weight of the mesh 1 is not particularly limited, but is preferably 100 g / m ² or more, more preferably 150 g / m ² or more, preferably 900 g / m ² or less, more preferably 700 g / m ² or less. When the basis weight of the mesh 1 is not less than the above lower limit value, the rigidity of the mesh 1 can be further increased. On the other hand, when the basis weight of the mesh 1 is not more than the above upper limit value, the mesh interval of the mesh 1 is sufficiently secured, and the impregnation property of the matrix resin 8 can be further enhanced. Therefore, the adhesiveness between the mesh 1 and the matrix resin 8 can be further enhanced.

Since the mesh 1 of this embodiment can obtain sufficient load and displacement in the punching test that is an index of the concrete peeling prevention characteristic, the reinforcing effect of the concrete frame can be enhanced, and the concrete peeling prevention use Can be suitably used.

Hereinafter, details of the glass fiber bundle and the synthetic fiber bundle constituting the mesh 1 will be described.

(Glass fiber bundle)
The glass fiber bundle includes a plurality of glass fiber monofilaments and a coating covering the surface of the glass fiber monofilament.

The glass fiber bundle constituting the warp yarn 2 and the weft yarn 3 includes, for example, a bundle of a plurality of glass fiber monofilaments of about several tens to several hundreds. A plurality of glass fiber monofilaments are focused by applying a sizing agent to the surface. A film is formed by drying the sizing agent.

Each of the glass fiber monofilaments constituting the glass fiber bundle preferably contains 12% by mass or more of ZrO ₂ as a glass composition. Thus, when 12 mass% or more of ZrO ₂ is contained, the alkali resistance can be further improved. Therefore, it is difficult for the mesh 1 to be eroded by the alkali component present in the cement, and the deterioration of the mesh 1 can be further suppressed.

In addition, when R ₂ O (R is at least one selected from Li, Na and K) is contained in an amount of 10% by mass or more, even if ZrO ₂ is contained in an amount of 12% by mass or more, the meltability is further improved. Can be. Note that the _{R 2} O is 10 wt% or more, _Li 2 O in the glass fiber monofilaments in, the total content of Na ₂ O and _{K 2} O, refers to at least 10 mass%.

As such a glass fiber monofilament, for example, as a glass composition, by mass%, SiO ₂ 54 to 65%, ZrO ₂ 12 to 25%, Li ₂ O 0 to 5%, Na ₂ O 10 to 17%, K ₂ O 0-8%, R′O (where R ′ represents Mg, Ca, Sr, Ba, Zn) 0-10%, TiO ₂ 0-10%, Al ₂ O ₃ 0-2% Including, preferably by mass%, SiO ₂ 57-64%, ZrO ₂ 14-24%, Li ₂ O 0-3%, Na ₂ O 10-17%, K ₂ O 0-5%, R′O (However, R ′ represents Mg, Ca, Sr, Ba, and Zn.) A material containing 0.2 to 8%, TiO ₂ 0.5 to 9%, and Al ₂ O ₃ 0 to 1% should be used. it can.

The glass fiber monofilament containing 12% by mass or more of ZrO ₂ preferably has a tensile strength of 500 to 1700 MPa in view of manufacturing cost and strength.

The average diameter of the glass fiber monofilament is preferably 10 μm or more and 30 μm or less, more preferably 10 μm or more and 20 μm or less. When the average diameter of the glass fiber monofilament is not less than the above lower limit, the productivity can be further enhanced. When the average diameter of the glass fiber monofilament is not more than the above upper limit value, the surface area can be further increased and the adhesion with the matrix resin 8 can be further enhanced. Further, in the punching test, the glass fiber bundle can be made more difficult to break.

Examples of the resin constituting the 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. These may be used alone or in combination.

Further, it is preferable that the coating further contains a silane coupling agent. 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 adhesiveness of a glass fiber bundle and the matrix resin 8 can be improved further by adding a silane coupling agent.

From the viewpoint of further improving the adhesion with the matrix resin 8, the coating preferably has high hydrophobicity.

In addition to the above-mentioned silane coupling agent, the coating can contain components such as a lubricant, a nonionic surfactant, and an antistatic agent. To decide.

In the glass fiber bundle, it is preferable that the ignition loss after being immersed in a styrene monomer at 25 ° C. for 1 hour is 20% or more lower than the ignition loss before immersion.

Specifically, first, a glass fiber bundle with a known loss on ignition is prepared. The loss on ignition is a value measured by the method described in JIS R3420 (2013). Next, 20 g of this glass fiber bundle is immersed in 1000 ml of styrene monomer at 25 ° C. for 1 hour. Then, the glass fiber bundle is pulled up and dried at 25 ° C. for 24 hours. Thereafter, the loss on ignition of the dried glass fiber bundle is measured by the method described in JIS R3420. The ignition loss after immersion in the styrene monomer thus measured is preferably 20% or more lower than the ignition loss before immersion. In this case, the adhesiveness between the glass fiber bundle and the matrix resin 8 can be further enhanced.

Note that, as described above, the coating is formed by applying a sizing agent to the surface of the glass fiber monofilament and drying it. Accordingly, the coating and the sizing agent contain the same components.

The count of the glass fiber bundle is not particularly limited, but is preferably 100 tex or more and 3000 tex or less. When the count of the glass fiber bundle is within the above range, the load and displacement can be further increased in the mesh 1 push-out test.

(Synthetic fiber bundle)
The synthetic fiber bundle constituting the warp yarn 2 and the weft yarn 3 is a bundling body of a plurality of synthetic fiber monofilaments. But the synthetic fiber bundle may be comprised by one synthetic fiber.

In addition, the synthetic fiber bundle preferably has a tensile elongation measured in accordance with JIS L1015 (2010) of 2% or more and 10% or less. When the tensile elongation of the synthetic fiber bundle is in the above range, the tensile elongation of the synthetic fiber bundle is close to the tensile elongation of the glass fiber bundle. It is even closer to the behavior of Therefore, the mesh 1 is stressed more evenly with respect to the external stress, and both the tensile strength and the adhesiveness of the mesh 1 can be further enhanced. Specifically, after the sheet 6 is peeled from the concrete housing 7 in the punching test, the synthetic fiber bundle extends in the same manner as the glass fiber bundle, and as a result, higher tensile strength can be imparted to the sheet 6. The tensile elongation is more preferably 3% or more and 7% or less.

The synthetic fiber bundle is not particularly limited, and examples thereof include a carbon fiber bundle, an aramid fiber bundle, and a polyethylene fiber bundle. These may be used alone or in combination. In the mesh 1, the fiber bundles constituting the warp yarn 2 and the weft yarn 3 are preferably the same type of synthetic fiber bundles, but may be different types of synthetic fiber bundles.

The count of the synthetic fiber bundle is not particularly limited, but is preferably 20 tex or more and 1000 tex or less. When the count of the synthetic fiber bundle is within the above range, the load and displacement can be further increased in the punching test.

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

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

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 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 1 which is a woven fabric woven by entanglement weaving can be obtained.

Note that the mesh 1 may be further covered with a coating resin. In that case, a coating resin material such as an acrylic resin, an unsaturated polyester resin, or a vinyl ester resin is applied to the mesh 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 to be sealed. 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 1 is dried. In addition, before making it dry, the mesh 1 may be pressed with a pair of squeeze rollers, 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.

Of course, in addition to the method of covering with a coating resin and sealing, it is possible to mix the warp yarn 2 or the weft yarn 3 with a heat-fusible yarn and heat-press it with a hot press or the like. In this case, it is not necessary to apply a secondary binder, and the matrix resin 8 is more easily impregnated between the fibers, and the adhesiveness between the matrix resin 8, the glass fiber bundle and the synthetic fiber bundle can be further enhanced. In addition, it is preferable that the heating temperature in the case of thermocompression bonding is 100 degreeC or more and 200 degrees C or less. When the heating temperature is equal to or higher than the lower limit, the sealing strength can be further increased. Moreover, when heating temperature is below said upper limit, modification | denaturation of a sizing agent can be suppressed. Moreover, as a heat-fusible thread | yarn, when using a heat-fusible thread | yarn whose glass transition temperature is 150 degrees C or less, since it can seal by hot pressing at low temperature, it is preferable.

(Second Embodiment)
FIG. 5 is a schematic plan view showing a mesh according to the second embodiment of the present invention.

As shown in FIG. 5, the mesh 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.

The mesh 21 of the second embodiment also includes a synthetic fiber bundle having a specific tensile strength, and the volume ratio of the glass fiber bundle is within the specific range. Both displacements can be obtained. Thus, since the mesh 21 is excellent in the punching characteristic which becomes an index of the concrete peeling prevention characteristic, the reinforcing effect of the concrete frame can be enhanced and can be suitably used for concrete peeling prevention.

The mesh of the present invention is not limited to the entangled weave and the plain weave as in the first embodiment and the second embodiment, and a pattern-woven fabric can also 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. Further, it may be biaxial or may be multiaxial with three or more axes. However, it is preferable that both the glass fiber bundle and the synthetic fiber bundle are arranged equally in the coaxial direction, and it is preferable that both the glass fiber bundle and the synthetic fiber bundle are arranged on each axis.

[Concrete peeling prevention material]
FIG. 6 is a schematic cross-sectional view showing a concrete exfoliation preventing material according to an embodiment of the present invention. As shown in FIG. 6, the concrete exfoliation preventing material 10 includes a mesh 1 and a matrix 12. The mesh 1 is the mesh of the first embodiment described above. The mesh 1 is embedded in the matrix 12. In addition, as shown in FIG. 6, 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 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 can be effectively prevented. Can do.

The material of the matrix 12 is not particularly limited, and for example, a matrix resin can be used like the matrix resin 8 used in the first embodiment. Examples of the matrix resin include an epoxy resin, a urethane resin, an acrylic resin, a phenol resin, and a polyester resin. These may be used alone or in combination.

In the present invention, the matrix may not be a resin, and may be an inorganic material made of, for example, a cement-based binder. The glass fiber bundle has good adhesiveness with calcium silicate crystals generated from the hydration reaction of the cement-based binder. Even in this case, since the mesh 1 is provided, the reinforcing effect of the concrete can be enhanced, and it can be suitably used as a concrete reinforcing material.

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, 2, 5 to 11)
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. The glass fiber monofilament was drawn from a bushing having several hundred to several thousand nozzles of the molten glass, and the raw material was prepared so as to be a glass having a composition of 1% and 7.4% by mass of TiO ₂ .

Next, a sizing agent in which vinyl silane, a saturated polyester resin, and a lubricant are dispersed in water is adjusted on the surface of the obtained glass fiber monofilament with an applicator so that the loss on ignition is 0.8% by mass. After coating and bundling the glass fibers, the sizing agent was dried to produce a glass fiber bundle.

Next, a mesh 31 shown in FIG. 7 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 glass fiber bundle 33a and the synthetic fiber bundle 33b were twisted to produce a weft thread 33. By weaving the weft thread 33 into the warp thread 32, a mesh 31 woven by entanglement weaving was obtained. Details of materials constituting the mesh 31 obtained in Examples 1, 2, and 5 to 11 are shown in Tables 1 and 2 below. In Examples 1, 2, 5 to 7, aramid fibers (tensile strength: 3000 MPa, tensile elongation: 3.6%) were used as the

synthetic fiber bundles

32b and 33b for both the warp yarn 32 and the weft yarn 33. In Examples 8 to 11, both the warp yarn 32 and the weft yarn 33 used polyethylene fibers (tensile strength: 3200 MPa, tensile elongation: 4.1%) as the

synthetic fiber bundles

32b and 33b.

(Examples 3, 4, and 12)
A mesh 41 shown in FIG. 8 was produced. Specifically, a glass fiber bundle 42 a obtained in the same manner as in Example 1 and a synthetic fiber bundle 42 b prepared in advance were used as warp yarns 42. Further, a glass fiber bundle 43 a obtained in the same manner as in Example 1 and a synthetic fiber bundle 43 b prepared in advance were used as the weft yarn 43. The mesh 41 was obtained by plain weaving the warp yarn 42 and the weft yarn 43. The glass fiber bundles 42 a and the synthetic fiber bundles 42 b were alternately arranged in the direction along the weft 43. Further, the glass fiber bundles 43 a and the synthetic fiber bundles 43 b were alternately arranged in the direction along the warp yarn 42. Details of materials constituting the mesh 41 obtained in Examples 3, 4 and 12 are shown in Tables 1 and 2 below. In Examples 3 and 4, aramid fibers (3000 MPa, tensile elongation: 3.6%) were used as the

synthetic fiber bundles

42 b and 43 b for both the warp yarn 42 and the weft yarn 43. In Example 12, both the warp yarn 42 and the weft yarn 43 used polyethylene fibers (tensile strength: 3200 MPa, tensile elongation: 4.1%) as the

synthetic fiber bundles

42b and 43b.

(Comparative Example 1)
In Comparative Example 1, a glass fiber bundle obtained in the same manner as in Example 1 was used instead of the

synthetic fiber bundles

42b and 43b in Example 3, and a mesh composed of only glass fiber bundles woven by plain weaving was obtained. Details of materials constituting the mesh obtained in Comparative Example 1 are shown in Tables 1 and 2 below.

(Comparative Example 2)
In Comparative Example 2, 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 consisting only of a synthetic fiber bundle woven by entanglement weave was obtained. Details of materials constituting the mesh obtained in Comparative Example 2 are shown in Tables 1 and 2 below. In Comparative Example 2, an aramid fiber (3000 MPa, tensile elongation: 3.6%) was used as a synthetic fiber bundle constituting the warp and the weft.

(Comparative Example 3)
In Comparative Example 3, the same procedure as in Example 3 was used except that vinylon fibers (tensile strength: 1200 MPa, tensile elongation: 7%) were used instead of aramid fibers as a synthetic fiber bundle constituting warp and weft. A mesh was prepared.

(Sample characteristic evaluation)
(Tensile strength)
The weft tensile strength of the meshes obtained in Examples 1 to 12 and Comparative Examples 1 to 3 was measured according to JIS L1015 (2010). The results are shown in Table 2 below.

(Punching test (punching performance))
The mesh punching tests obtained in Examples 1 to 12 and Comparative Examples 1 to 3 were issued in July 2015 by East Japan Expressway Co., Ltd., Central Japan Expressway Co., Ltd. and West Japan Expressway Co., Ltd. NEXCO Test Method Part 7 Tunnel-Related Test Method Test method 734 was performed. Table 2 shows the punching load and displacement at the maximum load.

The meshes obtained in Examples 1 to 12 include a glass fiber bundle and a synthetic fiber bundle having a tensile strength of 2000 MPa or more, and the volume of the glass fiber relative to the sum of the volumes of the glass fiber bundle and the synthetic fiber bundle. Since the ratio is 20% or more and 95% or less, the punching load is 5.1 N or more, the punching displacement is 15 mm or more, and the concrete frame can be efficiently reinforced.

On the other hand, since the mesh obtained in Comparative Example 1 was composed only of a glass fiber bundle, the punching load was low, and the glass fiber bundle was broken, so the punching displacement was also low. Since the mesh obtained in Comparative Example 2 was composed only of synthetic fiber bundles, the mesh slipped out of the matrix as the punching load increased, and both the punching load and the punching displacement were low. The mesh obtained in Comparative Example 3 had a low punching load because the tensile strength of the synthetic fiber bundle was low.

1, 2, 31, 41 ...

mesh

2, 4, 32, 42 ... warp yarn 2a ... first strand 2b ...

second strand

3, 5, 33, 43 ...

weft yarn

4a, 5a, 32a, 33a, 42a, 43a ...

Glass fiber bundles

4b, 5b, 32b, 33b, 42b, 43b ... Synthetic fiber bundle 6 ...

Sheet

7, 13 ... Concrete casing 8 ... Matrix resin 10 ... Concrete exfoliation preventing material 12 ... Matrix

Claims

A mesh composed of fiber bundles extending in a plurality of directions,
A glass fiber bundle,
A synthetic fiber bundle having a tensile strength of 2000 MPa or more;
With
The mesh whose volume ratio of the said glass fiber bundle with respect to the sum of the volume of the said glass fiber bundle and the said synthetic fiber bundle is 20% or more and 95% or less.
The mesh according to claim 1, wherein the tensile elongation of the synthetic fiber bundle measured in accordance with JIS L1015 (2010) is 2% or more and 10% or less.
The mesh according to claim 1 or 2, wherein the basis weight is 100 g / m 2 or more and 900 g / m 2 or less.
The mesh according to any one of claims 1 to 3, comprising a plurality of warps and a plurality of wefts.
The mesh according to claim 4, wherein at least one of the warp and the weft includes both the glass fiber bundle and the synthetic fiber bundle.
The warp and the weft include both the glass fiber bundle and the synthetic fiber bundle,
The ratio (synthetic fiber bundle) / (glass fiber bundle) of the number of the synthetic fiber bundles and the number of the glass fiber bundles in the warp is 0.5 or more and 2.0 or less,
The ratio (synthetic fiber bundle) / (glass fiber bundle) between the number of the synthetic fiber bundles and the number of the glass fiber bundles in the weft yarn is 0.5 or more and 2.0 or less. The described mesh.
The mesh according to any one of claims 1 to 6, wherein the glass fiber bundle has a plurality of glass fiber monofilaments and a coating covering a surface of the glass fiber monofilament.
The mesh according to claim 7, wherein an average diameter of the glass fiber monofilament is 10 µm or more and 30 µm or less.
The ignition loss of the glass fiber bundle after being immersed in a styrene monomer at 25 ° C for 1 hour is 20% or more lower than the ignition loss of the glass fiber bundle before immersion. mesh.
The mesh according to any one of claims 7 to 9, wherein the coating contains a silane coupling agent.
The mesh according to any one of claims 1 to 10, wherein the glass fiber bundle and the synthetic fiber bundle are sealed with heat-sealing yarns.
The mesh according to any one of claims 1 to 11, which is used as a concrete peeling prevention material.
Matrix,
A mesh according to any one of claims 1 to 12,
A concrete peeling prevention material.