JPH09165251A - Lightweight fireproof structural material - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: A high-rise building / large-sized one having a specific gravity of 1.0 or less, which is less than half that of concrete, and having sufficient strength equal to or close to that of concrete with ALC plates or more, Provides a lightweight, fire-resistant structural material that can be constructed in a significantly lightweight structure, has a fragile surface, is hard, and has wear resistance and durability. SOLUTION: The early-strength cement is 5 to 38% by weight, the heat-resistant hollow fine particles are 7 to 25% by weight, the gypsum is 10 to 25% by weight, and the rest is a lightweight aggregate having an average specific gravity of 1.5 or less. A lightweight fireproof structural material that is used by kneading and mixing with water and pouring it into a formwork.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightweight structural material for constructing a frame of a building / civil engineering structure and a material for molding other shaped articles, which is kneaded with water and poured into a required mold. The present invention relates to a material which is solidified into a required shape.

[0002]

2. Description of the Related Art Conventionally, the skeleton of a building / civil engineering structure is widely constructed of concrete using cement.
This concrete structure is one in which cement, water, coarse aggregate and fine aggregate are kneaded and poured into it to harden it into the required shape, and it is used to construct the frame of a structure because it has high strength and durability. ing. However, this concrete has a specific gravity of 2 to 3, and when a high-rise structure is constructed from this concrete, the weight of the concrete itself makes it a heavy structure, and the walls and columns of the skeleton must be thick. It was difficult to design buildings and large structures. Also, ALC plate is known as a lightweight structure material, but the ALC plate is fragile and its strength is lower than that of concrete, and its rough surface is fragile and easily damaged.
Since the ALC board itself cannot be used as the decorative floor surface or wall surface, either the floor material or decorative wall material must be separately attached or concrete must be poured thinly.

[0003]

The problem to be solved by the present invention is to solve the problems of the conventional concrete structure and ALC plate, and to have a specific gravity of about 1.0 which is less than half that of concrete, while being lightweight. It has sufficient strength that is equal to or close to that of concrete and more than ALC plate, and can construct high-rise buildings and large-scale buildings with a wide range of weight, and its surface is not brittle and hard and wear-resistant. It is to provide an excellent lightweight fireproof structural material.

[0004]

Means for Solving the Problems The constitution of the present invention which has solved the above problems is as follows: 1) A cement-based structural material containing cement and aggregate as main raw materials, which has a heat resistance of 6 to 25% by weight. Light weight refractory structure material characterized by mixing hollow fine particles and kneading with water 2) Average specific gravity of lightweight aggregate of 30 to 55% by weight, cement 10 to 50% by weight %, The lightweight refractory structure material described in 1) 3) The lightweight refractory structure material described in 1) or 2) above, wherein the particle size of the hollow fine particles is 40 to 200 microns 4) The hollow fine particles are 5. The lightweight refractory structure material according to any one of 1) to 3) above, which is a hollow fine particle containing silicon oxide and aluminum oxide as main components in the process of becoming a slag of a boiler using pulverized anthracite as a combustion raw material. ) Gypsum is mixed at a rate of 10 to 25% by weight or more 1) The lightweight refractory structure material according to any one of 4) above 6) The above 1) using a high-strength cement as cement
~ 5) Light weight fireproof structural material according to any one of 7) Mix early cement with 10 to 50% by weight, heat resistant hollow fine particles with 6 to 25% by weight and gypsum with 10 to 25% by weight, and balance the rest with an average specific gravity. Is a lightweight aggregate having a ratio of 1.5 or less, and is kneaded with water before use.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The cement of the present invention may be either ordinary Portland cement or early-strength cement, but early-strength cement is preferred in civil engineering for shortening the number of construction / construction work days. 40-20 for heat-resistant hollow fine particles
A particle size of about 0 micron is desirable, and the specific gravity is 0.2 to 0.7.
Therefore, 0.2 to 0.4 is effective and desirable for increasing the weight reduction. The cost is low and the heat resistance is high when using hollow fine particles with a specific gravity of about 0.3, which contains silicon oxide and aluminum oxide as main components and is generated in the process of becoming a slag of a boiler using pulverized anthracite as a combustion raw material. It can be made lightweight and lightweight.
The specific gravity of the building (product) when the lightweight refractory structure material is kneaded with water and molded varies greatly depending on the blending ratio of the hollow fine particles. When the hollow fine particles are mixed in an amount of about 25% by weight, the specific gravity becomes about 0.7 to 0.8, which is considerably light weight. At 6% by weight, the specific gravity is about 1.4 or more. At the same time, the compressive strength is about 9.3 N / mm ² or less at about 25% by weight, which is low, but still slightly higher than that of the ALC plate, and the compressive strength is about 20.7 at about 6% by weight.
A concrete strength of N / mm ² or more and a concrete strength of 50 N / mm ² can be used. Therefore, in consideration of the specific gravity and strength of the product, it is practical that the hollow fine particles have a mixing ratio of 6 to 25% by weight. Further, the aggregate is desirable in order to reduce the weight of the lightweight aggregate, and in that case, the mixing ratio of 30 to 55% by weight is preferable, and the mixing ratio of cement to 10 to 50% by weight becomes practical. Next, in the present invention, there are a type in which gypsum is mixed and a type in which gypsum is not mixed, but when gypsum is mixed with the refractory structure material of the present invention, the fire resistance of the product is increased. When the mixing ratio of gypsum is 10% by weight or more, the effect of fire resistance becomes apparent, and when it exceeds 25% by weight, the product strength decreases,
An effective ratio is 5% by weight. The lightweight aggregate of the present invention can significantly reduce the specific gravity of the product as compared with the ordinary aggregate while increasing the strength of the product. To use the lightweight refractory structure material of the present invention, 1
The mixture is kneaded at a weight ratio of about 0: 2 to 3.5, poured into a mold or floor / wall material, or coated on the surface for use. As a result, the specific gravity is around 1.0 and the compressive strength is 9 to 50 N /
It is possible to obtain a lightweight structure or modeled object having a size of about mm ² .
As a result, the total weight of high-rise buildings and large civil engineering structures can be reduced to less than half.

[0006]

EXAMPLES The present invention will be described below based on examples.
The blending ratio of the lightweight fireproof structural material of the present invention was changed to Tables 1, 2 and 3, and high-strength cement was used as the cement, and a thermal power plant boiler using powderless anthracite as a raw material for hollow fine particles. The particle size generated in the process of becoming a smoke slag is 40 ~
Hollow fine particles of Table 4 (abbreviated as MB in Tables 1 to 3) having the following chemical composition of 200 microns and an average of 100 microns are used, and gypsum is mixed in a considerable ratio to make a lightweight aggregate. Is an example of using a lightweight aggregate having an average specific gravity of about 1.25.

[0007]

[Table 1]

[Table 2]

[Table 3]

[Table 4]

Products of the compounding ratios shown in Tables 1, 2 and 3 were kneaded with water and solidified on the 28th day (test piece NO.
The specific gravity of -1,2,3) and the compressive strength were the following results. Product Specific gravity Compression strength Test piece NO-1 in Table 1 1.21 14.6 N / mm ² Test piece NO- ^{2 in} Table 2 1.29 20.7 N / mm ² Test piece NO in Table 3 -3 1.12 9.29 N / mm ² The specific gravity of this test piece No. 1, 2, 3 is approximately half that of conventional concrete, but its compressive strength is A.
The strength was 3 to 6 times the strength of the LC plate, and was close to that of conventional concrete. In addition, the fire resistance of all the test pieces was as good as or higher than that of concrete.
Also, it was recognized that the heat insulating property was excellent. The surface is glossy, dense and smooth, and can be used as a wall or floor without finishing. If the mixing ratio of the hollow microparticles and the gypsum is reduced and the ratio of the cement is increased, it is possible to achieve the same strength as the conventional concrete.

[0009]

As described above, according to the present invention, although the specific gravity is about 1/2 or less of the conventional concrete and the light weight, it has sufficient strength comparable to or close to that of the conventional concrete. In addition, the surface was hard, and the surface was not brittle and was excellent in wear resistance. By using this, the weight of the skeleton of the building can be reduced by about half, and an inexpensive and high-rise building can be realized. Furthermore, the fire resistance can be enhanced by mixing gypsum. In addition, it can be used as a substitute for conventional concrete products other than structures, and enables lightweight molded products with excellent strength and fire resistance.

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Claims (7)

[Claims] 1. A cement-based structural material comprising cement and an aggregate as main raw materials, wherein heat-resistant hollow fine particles are mixed at a ratio of 6 to 25% by weight and kneaded with water to be used. Characteristic lightweight fireproof structure material. 2. A lightweight aggregate having an average specific gravity of 1.5 or less is 30
The lightweight fireproof structural material according to claim 1, wherein the cement is mixed in an amount of about 55% by weight and about 10% by weight of cement. 3. The lightweight fireproof structural material according to claim 1, wherein the hollow fine particles have a particle size of 40 to 200 microns. 4. The hollow fine particles are hollow fine particles containing silicon oxide and aluminum oxide as main components, which are produced in the process of becoming a smoke slag of a boiler using pulverized anthracite as a combustion raw material. 3. A lightweight fireproof structural material according to any one of 3 above. 5. The lightweight fireproof structural material according to claim 1, wherein gypsum is mixed in a proportion of 10 to 25% by weight or more. 6. The lightweight fireproof structural material according to claim 1, wherein a high-strength cement is used as the cement. 7. Light weight bone containing 10 to 50% by weight of early strength cement, 6 to 25% by weight of heat-resistant hollow fine particles and 10 to 25% by weight of gypsum, and the rest having an average specific gravity of 1.5 or less. A lightweight fireproof structural material characterized by being used as a material and kneaded with water.