JP2002069785A - Twisted yarn material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an excellent material for reinforcing concrete or mortar. SOLUTION: This fabric is obtained by weaving or knitting a twisted yarn material made by twisting a glass yarn with a vinylon yarn.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing material for concrete or mortar, and more particularly, to a novel reinforcing material used in forming a structure using cement such as concrete or mortar as a binder. Materials: In particular, a woven or knitted cement or mortar made by weaving or knitting a ply-twisted yarn made by twisting both, in relation to a composite in which glass fiber and vinylon fiber are plied. Therefore, the present invention is used in the field of formation of structures using cement such as concrete, mortar and the like as a binder, that is, civil engineering and construction.

[0002]

2. Description of the Related Art Various structures and molded products made of cement such as concrete and mortar as a binder have excellent compressive strength, durability, non-combustibility, etc., but have bending resistance, tensile strength, bending stress. In order to compensate for such weakness and weakness, asbestos, crushed stone, sand, asbestos, glass fiber, steel wool, reinforcing steel, wire mesh, and the like are used.

For example, a slate using asbestos has been known for a long time, and is commonly called G using glass fiber.
As in the case of what is called glass fiber reinforced cement (RC), there is a situation in which the mechanical performance is improved by blending inorganic fibers. These are basically ones in which a cement concrete matrix is integrated with fibers (short fibers or long fibers) as a reinforcing material.

Japanese Patent Application Laid-Open No. Sho 59-18152 discloses that a plurality of polyvinyl alcohol fibers are integrated so as to be separable by an adhesive and used as a cement reinforcing material. Cement mortar and concrete moldings reinforced by blending polyvinyl alcohol fiber with specific performance are shown in JP-B-64-1424.

A net-like sheet made of inorganic fibers such as carbon and glass fibers and organic long fibers such as vinylon, aramid and polyester is planted with a pile of alkali-resistant fibers, and the short fibers are expected to be anchored to the mortar. It is disclosed in Japanese Patent Application Laid-Open No. 10-18543 that the fibrous structure is used as a reinforcing material for mortar.

[0006] However, asbestos is problematic because the scattering of the fine powder impairs the health of workers and furthermore, the disposal of molded products containing the fine particles affects environmental pollution. On the other hand, as for the glass fiber, even if the molded product containing it is initially excellent in mechanical strength, the glass fiber itself is weak to impact, so the fiber is easily broken by a slight impact In some situations, it is difficult to withstand the alkaline environment, and it is inevitable that the mechanical performance of the molded product will deteriorate over time, thus affecting the performance of the molded product. is there.

[0007] Organic fibers, including polyvinyl alcohol fibers, cannot be avoided from being easily deformed by an external force such as bending or bending as a problem peculiar thereto.

[0008] Reinforcing by the use of steel materials such as reinforcing bars and steel frames has been widely performed. Conventionally, these steel materials are very excellent materials for concrete reinforcement, but have been noticed due to the recent problem of deterioration of concrete structures. As time passes, rust and corrosion of steel occur over time, voids occur at the bonding interface with cement, which is a binder, and the steel does not perform its reinforcing function, and eventually the interface peels off, It is a phenomenon that things are destroyed.

In the case of use in places where magnetism is used as in a linear motor car, it is important to use a non-magnetic material for the structure. As one method for satisfying such a condition, it has been considered to use glass fiber or synthetic fiber which is non-corrosive and which is a non-magnetic material instead of steel.

[0010] When mortaring the outer wall of a building, a metal wire mesh (called a metal lath) is fixed with nails or the like to serve as a base, and the mortar is painted from above and held. At the same time, reinforcement of the mortar is performed, but also in this case, as rust comes out of the metal, the function of holding the mortar decreases and the mortar comes off.

Although the hardening of cement involves a complex chemical reaction due to hydration, the use of water that greatly exceeds the theoretical amount of bound water necessary for hydration is also a factor in the generation of rust. it is conceivable that.

Concrete and mortar have low tensile strength, tend to crack due to various causes, show large drying shrinkage in the initial stage of hardening, and cause cracks. Therefore, only cement and aggregate as binders are used. Since these cannot be completely prevented, it is necessary to form a composite with a fiber material or the like.

[0013]

SUMMARY OF THE INVENTION The present invention relates to a novel material which can be used in place of metal, glass or polymer fiber materials conventionally used as a reinforcing material for concrete and mortar, or which can be used in combination with these materials. Provide materials.

[0014]

Means for Solving the Problems The inventors of the present invention have:
Surprisingly, in the process of conducting intensive research in search of concrete and mortar reinforcing materials that can replace conventional reinforcing materials, it is possible to ply twist composite of glass fiber and vinylon fiber, which were previously used independently. And that the ply-twisted composite is effective as an alternative reinforcing material.

[0015] Conventionally, it has been considered that both fibers are liable to fluff, so that it is difficult to form a composite by twisting.
Although no attempt has been made to combine them, it has been clarified that this is possible according to the present invention. The present invention has been made based on such findings.

The vinylon fiber used here has excellent tensile strength, tear strength and impact resistance, and also has good alkali resistance. Since the fibers have good adhesion and are highly hygroscopic, it can be expected to appropriately absorb excessive water.

[0017] Vinylon fibers are produced by wet spinning of a spinning solution, and those having a diameter of 0.05 to 0.15 mm are changed to 500 to 7500 mm depending on the pores and the number of holes of the spinneret.
The present invention uses what is spun into a coagulating liquid, which is provided with a proper thickness by being aligned. Alternatively, it may be a split yarn made from an elongated film split using the difference in strength between the longitudinal direction and the width direction.

Next, the glass fibers used in the present invention are not limited to those having a special performance.
Those made in the usual way can be used. Glass fibers include so-called E glass having excellent electrical and mechanical properties, C glass having excellent chemical resistance, and reducing the alkali content of C glass.
CR glass, A glass, L glass, S glass, Y
Some are made of M31-A glass or the like, but any may be used.

Glass fiber filaments usually have a diameter of 10
Since it is spun as a filament having a length of from 20 μm to 20 μm, an appropriate number and bundle of the filaments can be subjected to ply twisting with vinylon fiber. However,
It is not necessarily limited to the use of a bundle, but may be a ply twist in a filament state.

Further, the above glass fiber can be processed into a fiber having further improved alkali resistance and used. As one of the processes for improving alkali resistance in such a case, there is a method of forming a thin film of zirconium oxide on the surface of the fiber using, for example, zirconium alkoxide. Those that have been subjected to such processing are also used as glass fibers.

Although there is no particular limitation on the fiber length, the short fibers produced by the centrifugal method or the spraying method have been hardened and lengthened by a method known per se, while the long fibers produced by the rod type or pot type spinning have no modification. Use one or more solidified ones.

As the vinylon fiber and glass fiber used in the present invention, in the case of a long fiber, an appropriate number of hardened fibers can be used. A combined yarn, that is, a spun yarn is used.
The thickness of both fibers used is from 20 TEX to 400 TEX
It is good to select and use one appropriately according to the application.

The present invention is directed to a fabric woven and knitted by using a ply twist of vinylon fiber and glass fiber, and the woven fabric is formed by twisting both fibers appropriately selected. Where it is used for forming and knitting, known right-hand twist (S-twist), left-hand twist (Z-twist)
Any one may be used. It may be any of a single twisted yarn, a plied yarn, a bitco plied yarn, a tough yarn, a wall twisted yarn, a piece twisted yarn, and the like.

In the case of long fibers, after the vinylon fiber and the glass fiber are subjected to a post-treatment after spinning, they are used to form the fabric of the present invention by immediately twisting an appropriate number of drawn fibers. You can also.

The number of twists is not particularly limited, but is one for knitting.
It is preferable to use 40 to 200 times per 00 cm and 40 to 300 times per 100 cm for weaving.

In any case, after twisting the vinylon fiber and the glass fiber, the fiber can be used without difficulty to produce the fabric of the present invention. Further, the material obtained by twisting the vinylon fiber and the glass fiber is converged so as to have an appropriate thickness, and the rod can be used as a reinforcing material instead of steel.

The fabric obtained from the twisted yarn of glass fiber and vinylon fiber thus obtained is used as a reinforcing material for concrete and mortar using cement as a binder. Range. When weaving the knitted yarn and knitting it into a fabric, examples of the woven fabric include plain weave, twill weave, satin weave, horizontal stripe weave, leno weave, and the like. Any of lace knitting, furthermore, mesh and the like may be used. It can also be used as a chopped strand other than fabric.

In addition, when a pipe or the like is molded, a uniaxial orientation is used to mold a wall or the like, and a plane is biaxially oriented when a wall or the like is molded. be able to. The shaft interval is not particularly limited because it is sufficient to set an appropriate distance depending on the thickness of the plying material to be used, but it is appropriately selected from about several millimeters to about one hundred millimeters.

The twisted composite obtained by twisting glass fiber and vinylon fiber provided by the present invention provides the rigidity and dimensional stability of glass fiber, alkali resistance and water absorption of vinylon fiber, and adhesion to cement. Therefore, the disadvantage of glass fiber is compensated for by vinylon fiber, and the disadvantage of vinylon fiber is compensated for by glass fiber. Therefore, it is excellent as a reinforcing material for concrete or mortar using cement as a binder.

In particular, this feature is a feature of the material obtained by the present invention, which cannot be obtained from steel materials, because lightness is a factor that can reduce the weight of the whole molded product. The fabric provided by the present invention is suitable for use in repairing bridges and tunnels.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below in detail to describe the present invention, but the present invention is not limited thereto.

[Example 1] Glass fiber D150 1/0
-1Z (manufactured by Unitika Glass Fiber Co., Ltd.) and Vinylon 230D (manufactured by Kuraray Co., Ltd.) were twisted at a twist of 120 turns / m to obtain a twisted yarn. The density of this plied yarn is 8 (1 × 1) yarns / 25 mm, width 8 yarns / 25 mm,
The fabric was entangled and woven with 59.3 TEX weft and 119 TEX. The weight of this fabric was 80 g / cm ² . The strength of this fabric is 440 vertical 445 N / 2
5 mm. The breaking elongation is 7.5% across, 7.3%.
%Met. This fabric is vertically 20 cm wide x 20
cm × 5 cm deep in a formwork with a depth of 2.5 cm
A composite layer having a mortar layer on the upper and lower sides was formed at a position like a sandwich, and after curing for 20 days, the mold was removed and the flexural strength was measured to obtain a measured value of 784 N / cm ² . After subjecting the same sample prepared under the same conditions to an exposure test in which the sample was left outdoors at a 45 ° angle for 1 year in the south direction, the composite layer was removed from the mold, and the bending strength was measured at 774 N / cm ^2. Was obtained. These data show that when the fabric of the present invention is used as a reinforcing material for a concrete or mortar structure, there is almost no deterioration with the passage of time, and the fabric of the present invention is extremely useful as a reinforcing material for cement or mortar. The bending strength was measured according to JIS K7055-1987 (Bending test method for glass fiber reinforced plastic).

[0033]

The reinforcing material for concrete and mortar using cement as a binder provided by the present invention is lightweight, and has appropriate rigidity, dimensional stability, alkali resistance, rust prevention, and novelty with cement. It is a new reinforcing material.

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Claims (3)

[Claims] 1. A fabric formed by weaving or knitting a twisted material formed by twisting glass fibers and vinylon fibers. 2. The fabric according to claim 1, which is a reinforcing material for a concrete or mortar structure. 3. A twisted yarn formed by twisting glass fiber and vinylon fiber.