JP2665496B2 - Fiber reinforced concrete molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a molded product formed by extrusion of concrete, and in particular, cuts a pile portion of a carpet in a textile (carpet) plant such as a carpet or a carpet. The present invention relates to a fiber-reinforced concrete molded product using carpet waste generated at the time of sintering as a fiber reinforcing material.

"Prior art" In general, fiber reinforced concrete is a material obtained by uniformly dispersing a short fibrous material in mortar or concrete, and the tensile strength and cracking strength of the fibrous material dispersed in concrete are high. In addition to increasing the toughness, the toughness is increased, and the brittleness of concrete is improved.

Such fiber-reinforced concrete differs not only in characteristics but also in production method to application field depending on the type of fibrous material used. For example, as a fibrous material having a higher Young's modulus has a higher crack restraining ability, a steel fiber or a glass fiber is generally used. on the other hand,
Since synthetic fibers such as nylon and polypropylene have a small Young's modulus (less than 1/10 of concrete, about 1/100 of steel)
Although the use of this material is not expected to increase the effect of restraining cracks, it is effective for improving impact resistance because of its large elongation.

Conventionally, among these fibrous materials, concrete using steel fiber and glass fiber has been used in various fields because of its superior properties to plain concrete, and synthetic fibers such as nylon and polypropylene fibers have been used. Since a composite material having excellent toughness can be obtained from, use of asbestos (asbestos) as an alternative to asbestos-cement molded products has been studied.

"Problem to be Solved by the Invention" The present invention is to solve the following problem in the above-described conventional technology.

That is, in recent years, the carcinogenicity of asbestos has become a problem, and the development of alternatives using fibrous materials in place of asbestos has been demanded due to problems with asbestos supply, health problems caused by asbestos, etc. Synthetic fiber such as fiber has a problem that the cost is still high and it is not enough as a substitute for asbestos.

The present invention has been proposed in view of the above circumstances, and an object of the present invention is to provide a fiber-reinforced concrete molded product that replaces an asbestos cement molded product at a low cost.

"Means for Solving the Problems" In order to achieve such an object, in the present invention, concrete is put into a hopper of an extruder while extrudable, and extruded with an extruder screw while extruding. It is a concrete molded product formed by extruding into a predetermined shape with a die and cutting it in the length direction, in order to align the upper surface or edge of the woven carpet in the concrete of the molded product This is obtained by mixing carpet waste generated when cutting a pile portion of a carpet with a cutter.

In addition, as the carpet waste, it is preferable to use a waste generated by shaving the pile portion with a shearing machine for a shaving machine.

[Operation] As described above, the fiber-reinforced concrete molded product of the present invention has carpet debris in which various types of fibers are mixed in a complicated manner, in a molded product extruded into a predetermined shape by extruding concrete. Since it is contained in a state, the values of the flexural modulus and tensile strength are increased, resulting in concrete products with high toughness and high tensile strength, bending strength and shear strength, which are effective and appropriate as substitutes for asbestos cement products. It will be.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing one embodiment of a fiber-reinforced concrete molded product according to the present invention. In the figure, a molded product indicated by reference numeral 1 as a whole is applied as a concrete spacer. Although not shown in the drawing, carpet debris generated when cutting the pile portion of the carpet with a cutter in order to align the upper surface or the edge of the woven carpet is mixed in the concrete which is the main portion of the spacer.

The carpet waste, which is the main material of the fiber-reinforced concrete molded product, is collected at a carpet factory by cutting the end of the thread (pile) on the carpet surface, and is generated from the carpet factory. All types are used, and the types, properties, and the like are not particularly limited. In addition, a shearing machine for a shaving machine is usually used for cutting (shearing) the surface of the pile portion. Therefore, carpet waste is mainly constituted by shaving by a cutter of the shearing machine.

The pile portion of the carpet is made of a thread such as acrylic, nylon, polyester, wool, rayon or the like obtained by spinning staple fibers, or a thread such as nylon or polypropylene obtained by bulking a continuous filament yarn. Therefore, the carpet waste collected by cutting the tip of the pile portion changes depending on these fibers constituting the carpet, but in a carpet factory or the like, these fibers are usually aggregates in which these fibers are intertwined in a waste form. .

To put it in more detail, carpets are intended for humans to live on, so piles are often planted in piles to give them a good-looking appearance and a soft, fluffy texture. It is densely planted so that it does not fall down due to the weight of furniture or furniture.
-30d) Further, the synthetic fiber is made to have a deformed cross section so that the pile can be easily compressed and recovered. Therefore, the carpet waste generated by cutting the tip of such a pile portion has a large single fiber denier (6 to 30 d), and has an irregular cross section with synthetic fibers.

In particular, synthetic fibers made by melt spinning such as nylon and polyester are easy to make the desired cross-sectional shape,
It has a trilobal shape with an emphasis on recovery and a polygonal cross section with an anti-dyeing effect.

In addition, spun yarn or bulky filament yarn is used for face yarn of carpet, and all yarns are crimped to improve the appearance, so the carpet waste is also crimped. Needless to say.

In addition, face yarns of spun yarn are made of different fiber blends such as wool and nylon blends, different denier blends, different color cotton mixes, etc., so even these carpet scraps are eventually different fiber blends, different denier blends, It is composed of a different-color cotton mix.

In order to obtain a concrete molded product (concrete spacer) using concrete using such carpet waste as a fibrous reinforcing material, for example, an extruder 2 as shown in FIG. 2 is used.

That is, in a carpet factory, carpet waste generated by cutting the tip of the pile portion is collected, and the carpet waste is kneaded with cement, aggregate, and necessary admixtures in powder form, and water is gradually added thereto. While being kneaded with a kneading mixer, put into a hopper 2a of an extruder 2, and extruded with an extrusion die 2b into a predetermined shape (a concrete spacer shape in the illustrated example) while extruding with an extrusion screw. This may be cut in the length direction by the cutter 2c.

The molded concrete product thus obtained has a high flexural fracture modulus and a high tensile strength value because the carpet fibers are contained in a dispersed state in the concrete, and as a result, the toughness is high and the tensile strength and It becomes a concrete product with high bending strength and shear strength, and it is effective and suitable as a substitute for asbestos cement products.

In particular, in the present invention, the use of carpet waste, which is industrial waste usually discarded from a carpet factory, can be effectively reused, so that the cost of the fibrous material can be suppressed at a low cost and the cost can be reduced. There is an advantage that an inexpensive fiber-reinforced concrete product can be provided.

Further, in the present invention, carpet waste is uniformly dispersed and mixed in the concrete to be put into the hopper, and a molded product is manufactured by extrusion molding, so that a high-quality fiber-reinforced concrete molded product can be obtained. it can.

It is needless to say that the present invention is not limited to the above-described embodiment, but can be applied to any product as long as it is an extruded product.

The composition of the carpet waste may be considered in the same manner as in the conventional asbestos composition. For example, by mixing carpet waste of 0.5 to 10% by weight of cement, the same as a plate used as asbestos slate or the like is used. Alternatively, a higher performance can be provided.

Next, the present invention will be described more specifically by showing test examples of the fiber-reinforced concrete molded product according to the present invention.

"Test Example 1" 1 wt% of carpet waste (carpet fiber) was added to ordinary Portland cement, silica sand and various admixtures.
%, 3% by weight, 5% by weight, 7% by weight, respectively, are kneaded with a mixer, kneaded with a kneading mixer while gradually adding water, and put into a hopper of an extruder, for extrusion molding. While extruding with an extruder screw, extrude from an extrusion die (40 mm x 40 mm and diameter 50 mm).
Then, two kinds of specimens (40 mm × 40 mm × 160 mm prism and 50 mmφ × 100 mm cylinder) were prepared. In addition, when no carpet waste was added (0 wt%), a specimen was prepared by the same manufacturing method.

And, in the prescribed material age (1 week, 4 weeks)
The following test was performed according to JIS-R-5201. here,
The compressive strength test and the split tensile strength test were performed on a cylindrical sample, the bending strength test was performed on a prismatic sample, and the specific gravity test was performed on both.

As a result, fiber reinforced concrete having the performance (specific gravity, compressive strength, split tensile strength, bending strength) as shown in FIGS. 3 to 6 was obtained. In the graphs of FIG. 3 to FIG. 6, ○ indicates a specimen of 1 week of material age, and ● indicates a specimen of 4 weeks of material age.

As shown in FIG. 3, as for the specific gravity, it is understood that the more the carpet waste is added, the smaller the specific gravity becomes.
It was found that the bending strength increased as the amount of carpet waste increased.

"Test Example 2" 1% by weight, 3% by weight, 5% by weight, and 7% by weight of carpet waste (carpet fiber) were added to ordinary Portland cement, respectively. Into the hopper of the extruder, extrude it with a screw for extrusion, extrude it into a cylindrical shape with a diameter of 50 mm with an extrusion die, cut it into a 100 mm length with a cutter. Thus, a specimen was prepared. In addition, when no carpet waste was added (0 wt%), a specimen was produced by the same production method.

Then, these specimens were added in order from 0 wt% to specimen A (0
wt.), specimen B (1 wt.%), specimen C (3 wt.%), specimen D (5 wt.%), and specimen E (7 wt.%), which were subjected to a static elasticity test.

FIG. 7 shows the relationship between the stress and the vertical strain obtained by the measurement result of the static elasticity test, and FIG. 8 shows the relationship between the stress and the horizontal strain obtained by the measurement result of the static elasticity test.

From these results, it was found that the fiber-reinforced concrete molded product obtained by the present invention had increased toughness.

[Effects of the Invention] As described above, the fiber-reinforced concrete molded product according to the present invention can be used for extrusion molding while putting concrete into a hopper of an extrusion molding machine while having extrudability, and extruding with a screw for extrusion molding. It is a concrete molded product formed by extruding into a predetermined shape with a die and cutting it in the length direction, in order to align the upper surface or edge of the woven carpet in the concrete of the molded product Carpet debris is produced by mixing carpet debris generated when cutting the carpet pile with a cutter.Carpet debris increases the strength of concrete instead of asbestos, and replaces asbestos cement at low cost. A fiber-reinforced concrete molded product can be provided.

[Brief description of the drawings]

1 and 2 show one embodiment of a fiber-reinforced concrete molded product according to the present invention. FIG. 1 is a perspective view of the molded product, and FIG. 2 is an extrusion molding machine used for producing the molded product. FIGS. 3 to 6 show graphs obtained in Test Example 1; FIG. 3 is a graph showing specific gravity, FIG. 4 is a graph showing compressive strength, and FIG. FIG. 6 is a graph showing tensile strength, FIG. 6 is a graph showing bending strength, and FIGS. 7 and 8 are graphs each obtained in Test Example 2, and FIG. 7 is a graph showing measurement results of vertical strain. FIG. 8 is a graph showing the measurement results of the transverse strain. 1 ... concrete spacer 2 ... extrusion molding machine

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroyuki Arai 2-6-21 Yaesu, Chuo-ku, Tokyo Rose Bay Yaesu Building Ishikawajima Building Materials Industry Co., Ltd. (72) Inventor Masanao Kimura 2 Heiwacho, Hitachi City, Ibaraki Inside 1-1 Hitachi Cement Co., Ltd. (72) Inventor Hiroaki Shiino 2-1-1 Heiwacho, Hitachi City, Ibaraki Prefecture Inside Hitachi Cement Co., Ltd.

Claims (2)

(57) [Claims] 1. Concrete is put into a hopper of an extruder while being extrudable, and is extruded into a predetermined shape by an extrusion die while being extruded by an extrusion screw, and cut in a length direction thereof. Carpet debris that is produced by cutting the pile of carpet with a cutter to align the top or edge of the woven carpet into the concrete of the molded product. A fiber-reinforced concrete molded product characterized by being made. 2. The fiber-reinforced concrete molded product according to claim 1, wherein said carpet waste is generated by shaving a pile portion by a shearing machine for a shaving machine.