JPH08151733A - Fiber fabric and manufacture of fiber-reinforced cement - Google Patents

Abstract

PURPOSE: To manufacture a cement product having a curved section and high strength with high workability and safety by arranging a netted fiber fabric into forms having a desired shape, curing the fiber fabric and pouring mortar into the forms. CONSTITUTION: A netted fiber fabric 10, in which fibers such as alkali-resistant glass fibers are formed in a netted shape by using a weaving machine, is disposed into forms 11 having a desired shape, coated with a resin emulsion, and made affinitive to the forms. The netted fiber fabric 10 is coated with the resin emulsion, and arranged into the forms 11 and made affinitive to the forms 11. The netted fiber fabric is dried by a hot air dryer and cured. Mortar is poured into the forms 11, and defoamed by applying vibrations and cured, thus obtaining a fiber-reinforced cement product. The meshes of the gratings of the fiber fabric 10 may be formed in a square or rectangular shape having size corresponding to application.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber woven fabric which can replace reinforcing reinforcing bars and wire mesh used in reinforced concrete,
The present invention relates to a method for producing a fiber-reinforced cement product using the same.

[0002]

2. Description of the Related Art Fiber-reinforced cement products are widely used in the interior and exterior materials of buildings and the field of civil engineering because they have high strength, light weight, nonflammability, etc., and excellent moldability. Is being used as an exterior material for skyscrapers.

In recent years, fiber-reinforced cement products have also been used in the field of civil engineering as a substitute for reinforced concrete by utilizing the properties of fiber-reinforced cement products such as high strength, light weight, and rust prevention. In this fiber reinforced cement product, as a reinforcing material which is an alternative to reinforcing bars and wire nets, 30 to 60% by weight of E glass fiber and 40% of thermosetting resin
After impregnation of 70% by weight, these were combined in a lattice and then cured.

[0004]

However, in the above-mentioned reinforcing material, since the glass fiber is completely covered with the resin, there is a problem that the adhesiveness with cement is poor and the reinforcing material is easily separated from the mortar.

This reinforcing material is formed in a lattice shape after impregnating glass fiber with a thermosetting resin, but it is difficult to produce a reinforcing material having a shape corresponding to a cement product having a curved portion. There was also the problem of poor processing productivity.

The present invention has been made in view of the above circumstances, and because it has good adhesiveness to mortar and good processing productivity, it is a fiber woven fabric suitable as a reinforcing material for cement products having curved portions, and An object of the present invention is to provide a method for producing a fiber-reinforced cement product using

[0007]

The fiber woven fabric of the present invention is a net-shaped fiber woven fabric used as a reinforcing material for a fiber reinforced cement product having a curved portion and hardened into a shape corresponding to the cement product to be reinforced. It is characterized by being done.

In the method for producing a fiber reinforced cement product of the present invention, a net-like fiber woven fabric is prepared by preparing a mold for molding a cement product having a curved portion and hardening it into a shape corresponding to the mold. Is placed in a mold, mortar is poured into the mold, and then vibration is applied to defoam it, followed by curing.

Further, the present invention is characterized in that the fiber is an alkali resistant glass fiber.

[0010]

The fiber used in the present invention is glass fiber,
Carbon fibers, aramid fibers and the like are used, but glass fibers are particularly preferable because they have excellent adhesiveness to cement as compared with other reinforcing fibers.

Cement reinforced with glass fiber is called GRC, and usually, as a glass fiber,
A roving in which one or a plurality of strands obtained by bundling 200 to 4000 single fibers of 24μ are combined and a yarn in which the strands are twisted are used.

As a material for the glass fiber, it is desirable to use alkali resistant glass fiber in consideration of long-term durability in cement. When alkali resistant glass fibers are used in the present invention, ZrO ₂ -containing alkali resistant glass fibers having an alkali solubility of 4% or less are particularly suitable. This alkali solubility means a fiber diameter of 13 ±
2 is a percentage of the degree of weight loss of glass fiber when 2 g of 0.2 μm glass fiber was immersed in 100 g of 10% sodium hydroxide aqueous solution at 95 ° C. for 1 hour.

Incidentally, the curved portion in the present invention means a curved portion or a bent portion, and for example, a fiber reinforced cement product having a U-shaped cross section or an L-shaped cross section has such a shape. become.

In the case of producing the net-like fiber woven fabric of the present invention, first, the fiber woven fabric in which the fibers are formed into a net-like shape by using a weaving machine is placed in a mold having a predetermined shape,
Apply a resin emulsion to this to make it fit in the mold,
Alternatively, after applying the resin emulsion to the above fiber fabric, it is placed in a mold having a predetermined shape and made to fit. Then, this is dried with a hot air dryer at a temperature of 120 to 180 ° C. for about 5 to 1
A method of curing by drying for 0 minutes is adopted.
The lattice of the fiber woven fabric may have a square or rectangular shape with a size of 5 to 30 mm, and the size may be changed according to the application.

The resin emulsion to be applied to the fiber woven fabric is not particularly limited as long as it can maintain the shape of the fiber woven fabric, but it is preferably one having alkali resistance if possible. Specifically, emulsions of phenol, melamine, epoxy, acrylic, vinyl acetate, ethylene-vinyl acetate copolymer, vinyl ester, polyester and the like are suitable. Considering the adhesiveness with mortar,
The amount of resin emulsion attached to the fiber is 10 to 30.
Weight percent is suitable.

In the present invention, it is preferable to use a fiber cut material such as glass chopped strands, a foam material, and a lightweight aggregate together with the net-like fiber woven fabric because the reinforcing effect is further improved.

[0017]

EXAMPLES The fiber woven fabric and fiber reinforced cement product of the present invention will be described in detail below with reference to examples.

Example 1 First, a net-shaped fiber woven fabric was prepared from alkali-resistant glass fibers using a loom. This fiber fabric is made of warp yarn (AR62 manufactured by Nippon Electric Glass Co., Ltd.).
0H-340V) and one weft (AR2500H-200 manufactured by Nippon Electric Glass Co., Ltd.) are entwined and woven so that the size of the grid is 20 × 20 mm.

Next, this fiber woven fabric is impregnated with a polyester emulsion so that the resin attachment rate becomes 30% by weight, and then the fiber woven fabric is placed in a mold having a curved portion and made to fit into it.
By drying at 60 ° C. for about 6 minutes and curing the resin, a net-shaped fiber woven fabric 10 having a U-shaped cross section as shown in FIG. 1 was obtained. In addition, in the above mold, the fiber woven fabric 10 is
It has such a shape that it can be placed in the center of the wooden form frame 11 shown in FIG.

Next, in a wooden form 11 as shown in FIG.
After disposing the above fiber woven fabric 10, mortar mixed with glass chopped strands was poured. As mortar, sand: normal Portland cement = 1: 1,
Water: Ordinary Portland cement = 0.35: 1, Water reducing agent: Ordinary Portland cement = 0.01: 1, and 2% by weight of alkali resistant glass chopped strands (ACS13H-530W manufactured by Nippon Electric Glass Co., Ltd.). Mixed.

Thereafter, the mold 11 is defoamed by vibrating for 60 seconds, then cured at room temperature for 24 hours, then demolded and cured at 20 ° C. in a constant temperature room for 28 days. A fiber reinforced cement product was made.

FIG. 3 shows the fiber-reinforced cement product 1 obtained.
2 is a cross-sectional view of the cement body 13 in which the fiber woven fabric 10 is contained in the central portion. Bending test pieces (250 × 12) were obtained from the fiber-reinforced cement product 12 thus obtained.
(0 × 15 mm) was cut out and the bending strength was measured based on a well-known three-point load test, and was 160 kg / cm ² .

(Example 2) Two woven fabrics similar to those of Example 1 were prepared and impregnated with a polyester emulsion so that the resin adhesion ratio would be 30% by weight, and two woven fabrics each having a curved portion having a different shape were formed. After placing it on the formwork and making it familiar, 16
The resin was cured by drying at 0 ° C for about 6 minutes. The two molds are shaped so that the fiber woven fabric can be arranged near the inner surface and the outer surface of a wooden mold similar to that of the first embodiment.

Next, in the same form as in Example 1, the above 2
Each of the fiber woven fabrics was placed at a position of about 2 mm from the mold surface, and mortar mixed with glass chopped strands similar to that of Example 1 was poured into the woven fabric to produce a fiber reinforced cement product under the same conditions.

FIG. 4 shows the fiber-reinforced cement product 1 obtained.
4 is a cross-sectional view of No. 4, in which two fibrous fabrics 16 and 17 are contained in the cement body 15 at a position 2 mm from the inner and outer surfaces. Fiber-reinforced cement product 1 thus obtained
A bending test piece (250 × 120 × 15 mm) was cut out from No. 4 and its bending strength was measured to be 400 kg / c.
m ² .

(Comparative Example) The same mortar as that used in Examples 1 and 2 was prepared, and an alkali resistant glass fiber chopped strand (ACS13H-53 manufactured by Nippon Electric Glass Co., Ltd.) was prepared.
0 W) was added in an amount of 2.0% by weight, mixed with an omni mixer for 30 seconds, poured into the wooden mold used in Examples 1 and 2, and then a fiber-reinforced cement product was produced under the same conditions.

The flexural strength of this fiber reinforced cement product was measured and found to be 130 kg / cm ² .

Further, the bending strength of the test pieces of Examples 1 and 2 was measured, and the fracture surface was observed. As a result, it was found that in the test piece of Example 2, most of the fibers located on the surface side to which the tensile stress was applied were cut. However, the fibers located on the surface side to which the compressive stress was applied were hardly cut. Further, in the test piece of Example 1, although a part of the fiber was cut, most of it was not broken.

[0029]

As described above, since the fiber fabric of the present invention has good adhesiveness with mortar, the fiber reinforced cement product using the woven fabric has high strength and is ruptured during and after the construction. Also, since fragments do not scatter, it has excellent workability and safety.

Further, since the fiber woven fabric of the present invention is once woven into a net shape and then formed into a predetermined shape, it has good processing productivity.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a net-shaped fiber woven fabric used in Example 1.

FIG. 2 is a cross-sectional view showing a mold in which a fiber fabric is arranged.

FIG. 3 is a cross-sectional view showing the fiber reinforced cement product of Example 1.

FIG. 4 is a cross-sectional view showing a fiber-reinforced cement product of Example 2.

[Explanation of symbols]

 10, 16, 17 Net-shaped fiber woven fabric 11 Form 12, 14 Fiber reinforced cement product 13, 15 Cement body

Claims (4)

[Claims] 1. A net-shaped fiber woven fabric used as a reinforcing material for a fiber-reinforced cement product having a curved portion, which is cured into a shape corresponding to a cement product to be reinforced. 2. The fiber woven fabric according to claim 1, wherein the fiber is an alkali resistant glass fiber. 3. A mold for forming a cement product having a curved portion is prepared, and a net-like fiber woven fabric which is cured into a shape corresponding to this mold is placed in the mold and mortar is then added. A method for producing a fiber-reinforced cement product, which comprises pouring and then defoaming by applying vibration and then curing. 4. The method for producing a fiber-reinforced cement product according to claim 4, wherein the fiber is an alkali resistant glass fiber.