JPH03193652A - Hydraulic hardened body - Google Patents

Abstract

PURPOSE:To obtain a hydraulic hardened body which is improved in brittleness and strength and good in durability by providing a specified buffer layer between a facing formed of slag, gypsum, cement and fiber and a continued long reinforcing material. CONSTITUTION:A hydraulic hardened body is obtained by providing a buffer layer between a facing formed of 30-80wt.% slag, 5-30wt.% gypsum, 2-20wt.% cement and 2-30wt.% fiber and a continued long reinforcing material. This buffer layer is constituted of the material wherein 1-10wt.% rubber or resin is incorporated in the above-mentioned facing. As the used rubber or resin, e.g. styrene-butadien rubber, chlorosulfonated polyethylene and acrylic resin are shown. In the case of utilization thereof, this rubber or resin is made to aqueous dispersion liquid. As the concn. thereof, solid content is preferably regulated to about 45-50wt.%. Thickness of this buffer material is adopted at about 0.5-3mm.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a hydraulically cured body, particularly a hydraulically cured body having improved brittleness and strength and good durability.

[Prior Art] In recent years, various cured products using inorganic hydraulic materials such as gypsum and cement have been proposed as various building materials, and some of them have been put into practical use.

These materials have the advantage of being relatively easy to mold into any shape (and also have excellent fire resistance).

[Problems to be Solved by the Invention] However, while this type of cured product has the above advantages, it also lacks strength and has the disadvantages peculiar to inorganic materials, such as the molded product breaking during transportation and construction. .

For this reason, various limitations must be taken into account in order to obtain various building components, especially products with small cross sections.

[Means for Solving the Problems] The present inventor aims to eliminate the various drawbacks of these hydraulic materials and to obtain a hydraulic cured body having high strength, good durability, and good moldability. As a result of various studies and examinations for this purpose, it has been discovered that the above object can be achieved by providing a buffer material between the long reinforcing material and the hydraulic material having a specific composition on its outer surface.

Thus, the present invention consists of slag 30-80% by weight, gypsum 5-3
A buffer layer is provided between the surface material consisting of 0% by weight, 2% to 20% by weight of cement, and 2% to 30% by weight of fibers and a continuous long reinforcing material, and the buffer layer is formed by adding 1% to 1% of rubber or resin to the surface material.
The object of the present invention is to provide a hydraulic cured body made of a material containing 10% by weight.

In the surface material of the present invention, it is necessary to use slag in an amount of 30 to 80% by weight.

If the amount of slag used deviates from the above range, it is unsuitable because sufficient strength cannot be developed.

Further, it is necessary to use 5 to 30% by weight of gypsum. If the amount of gypsum used is less than the above range, it will not be possible to obtain sufficient strength, and conversely, if it exceeds the above range, not only will it not be possible to obtain sufficient strength, but it will also have poor water resistance and durability. Both are inappropriate because they are also insufficient.

Further, it is necessary to use 2 to 20% by weight of cement.

If the amount of cement used deviates from the above range, sufficient strength may not be achieved, which is inappropriate.

Appropriate cements can be used as the cement used in the present invention, such as ordinary Portland cement, alumina cement, white cement, and various other mixed cements.

Further, it is necessary to use 2 to 30% of fiber. If the amount of fiber used is less than the above range, not only will sufficient strength not be developed, but the shape retention will be insufficient or unstable, and conversely, if it exceeds the above range, the strength will be insufficient, and Both are unsuitable because they cause difficulties in moldability and cause rough skin.

Examples of the fibers used in the present invention include glass fibers, alkali-resistant glass fibers, rock wool, etc. These fibers can be used in the form of filaments, but from the viewpoint of uniform mixing, chopped strand fibers are preferred. It is preferable to use

In the present invention, a cushioning material is provided between such a surface material and the inner reinforcing material. Such a cushioning material is made by adding 1 to 10% by weight of rubber or resin to the above-mentioned surface material.

If the content of rubber or resin is less than the lower limit of the above range, no effective improvement as a cushioning material can be expected; on the other hand, if it exceeds the upper limit of the above range, not only will the thermal properties deteriorate, Both are unsuitable because of their reduced fire resistance.

Examples of the rubber or resin include styrene-butadiene rubber, chlorosulfonated polyethylene, ethylene vinyl acetate, and acrylic resin. When used, these rubbers or resins are made into an aqueous dispersion, and the concentration thereof is preferably about 45 to 50% by weight of solids.

The cushioning material used has a thickness of about 0.5 to 3 mm.

If the thickness is less than 0.5 mm, no effective improvement of the cushioning material can be expected, and moldability may be difficult. On the other hand, if it exceeds 3 mm, it is not preferred from the viewpoint of fire resistance.

These compositions are thus molded into appropriate shapes, but
During molding, a long continuous reinforcing material is placed inside the molded body. The reinforcing material may be made of aluminum, steel, stainless steel, etc., and may have an appropriate shape such as a plate, a solid cylinder, a cylinder, a U-shape, or a hollow rectangular or cylindrical body. It is possible.

In addition, during molding, no plasticizer is used to improve the flowability of the material.
．． It is preferable to employ about 5 to 5% by weight, and it is particularly effective in extrusion molding. Furthermore, when a lightweight filler such as pearlite is used in an amount of up to about 20% by weight, it is possible to reduce the weight of the base material without substantially impairing physical properties such as strength.

The hydraulic cured body according to the present invention has high strength.

It is possible to obtain a product with very good durability without the occurrence of cracks or the like.

[Example] As surface material, 50% by weight of slag, 15% by weight of gypsum hemihydrate,
14% by weight of ordinary Portland cement, 10% by weight of ordinary chopped strand glass fibers with an average length of 12 mm, 10% by weight of perlite, and 1% by weight of plasticizer were thoroughly mixed, and 1 kg of the mixture was mixed with water. 500
cc (kneaded to adjust the surface material composition).

On the other hand, as a cushioning material, mix the surface material and 7% by weight of a commercially available ethylene vinyl acetate aqueous medium, and add 300 cc of water per 1 kg of the mixture (knead to adjust the cushioning material composition). The two compositions were made with a wall thickness of 2 mm, a horizontal length of 60 mm, and a vertical length of 30 mm.
A reinforcing material in the form of a hollow rectangular cylinder made of aluminum with a thickness of 2 mm was extruded using two extruders to form a cushioning material with a thickness of 2 mm between the reinforcing material and the surface material.

The resulting two-layer hollow body containing reinforcing material should then be dried (cured at 60°C for 12 hours, then dried at 105°C for 24 hours).
Let it dry for a while. The resulting material is extremely strong and durable.

Note that the thermal expansion coefficients of individual materials are as follows.

Surface material: 50X 10-'/℃ Buffer material:
90X10-'/”C reinforcement material: ll0X 1
0-'/'C [Effects of the Invention] According to the present invention, since the buffer material is provided at the interface between the reinforcing material and the surface material, durability is significantly improved. In particular, by setting the expansion coefficient of the cushioning material between that of the reinforcing material and the surface material to the same level as that of the reinforcing material, it is possible to prevent the occurrence of cracks due to temperature differences, and this has the effect of improving durability.

Note that the expansion coefficient of the buffer material can be varied by changing the aqueous dispersion.

Claims (2)

[Claims] (1) Slag 30-80% by weight, gypsum 5-30% by weight,
A buffer layer is provided between the surface material and the continuous long reinforcing material consisting of 2 to 20% by weight of cement and 2 to 30% by weight of fiber,
The buffer layer includes 1 to 10% by weight of rubber or resin on the surface material.
Hydraulic hardening body composed of contained materials. (2) The hydraulic cured body according to claim 1, wherein the thickness of the buffer material is 0.5 to 3 mm.