JP3030495B2 - Lightweight fire resistant structural material - Google Patents

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 building of a building or civil engineering structure and a material for molding other molded objects, which is kneaded with water and poured into a required mold. And a material to be solidified into a required shape.

[0002]

2. Description of the Related Art Hitherto, the frame of a building or civil engineering structure has been widely constructed of concrete using cement.
This concrete structure is made by kneading cement, water, coarse aggregate and fine aggregate, pouring and hardening to the required shape, and is used for building the structure of the structure from a place with high strength and durability. ing. However, this concrete has a specific gravity of 2-3, and when a high-rise structure is constructed with this concrete, it becomes a heavy structure only by the weight of the concrete itself. It was difficult to design buildings and large buildings. An ALC plate is also known as a light-weight frame structure material. However, the ALC plate is fragile, has a lower strength than concrete, and has a rough surface and is easily damaged.
The ALC board itself could not be used as a decorative floor / wall surface, and it was necessary to separately attach a floor material / decorative wall material or to pour concrete 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 reduce the specific gravity of less than half of concrete to about 1.0 while being light. It has sufficient strength that is equal to or close to that of concrete with ALC plate or more, and can be used to build high-rise buildings and large-scale buildings with a large and light weight. In addition, the surface is fragile, hard and wear-resistant. An object of the present invention is to provide an excellent lightweight fire-resistant structural material.

[0004]

Means for Solving the Problems The constitution of the present invention which has solved the above problems is: 1) A cement-based structural material mainly composed of cement and aggregate, which has a heat resistance of 6 to 25% by weight. The hollow fine particles are mixed, and a lightweight aggregate having an average specific gravity of 1.5 or less is 30 to
55% by weight, mixed with cement at 10-50% by weight
Gypsum is mixed in a ratio of 10 to 25% by weight or more and kneaded with water before use. 2) 10 to 50% by weight of early-strength cement, heat-resistant hollow fine
6-25% by weight of small granules and 10-25% by weight of gypsum
And the rest as lightweight aggregate with an average specific gravity of 1.5 or less.
A lightweight fire-resistant structural material characterized by being kneaded with water .

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The cement of the present invention may be either ordinary Portland cement or early-strength cement. However, early-strength cement is more preferable for civil engineering construction in order to shorten the construction and construction work days. Heat resistant hollow microparticles are 40-20
A particle size of about 0 micron is desirable, and a specific gravity is 0.2 to 0.7.
In order to improve the weight reduction, 0.2 to 0.4 is effective and desirable. The cost is low and high heat resistance is achieved by using hollow microparticles containing silicon oxide and aluminum oxide as main components and having a specific gravity of about 0.3, which are produced in the process of turning into boiler flue using pulverized anthracite as a combustion raw material. It can be made lightweight by nature.
The specific gravity of the building (product) when the lightweight refractory structural material is kneaded with water and formed is greatly changed depending on the mixing ratio of the hollow fine particles. When the hollow microparticles are mixed at about 25% by weight, the specific gravity becomes about 0.7 to 0.8, which is considerably light. 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 when the weight is close to 25% by weight, and the strength is low but the strength is slightly higher than that of the ALC plate.
N / mm ² or more and a concrete strength of about 50 N / mm ² can be obtained. Therefore, the mixing ratio of 6 to 25% by weight of the hollow microparticles is practical considering the specific gravity and strength of the product. In addition, the aggregate is desirably used to reduce the weight of the lightweight aggregate. In that case, the mixing ratio of 30 to 55% by weight is good, and the mixing ratio of cement is 10 to 50% by weight. Next, in the present invention, there is a type in which gypsum is mixed and a type in which gypsum is not mixed. However, when gypsum is mixed with the refractory structural material of the present invention, the fire resistance of the product increases. When the mixing ratio of gypsum is 10% by weight or more, the effect of fire resistance is apparent, and when it exceeds 25% by weight, the product strength decreases, and
5% by weight is an effective ratio. The lightweight aggregate of the present invention can greatly reduce the specific gravity of the product as compared with the ordinary aggregate while increasing the strength of the product. In order to use the lightweight refractory structural material of the present invention, the lightweight refractory structural material of the present invention and water are mixed together.
It is kneaded at a weight ratio of about 0: 2 to 3.5, poured into a formwork or a floor or wall material, or applied to the surface for use. Thereby, the specific gravity is around 1.0 and the compressive strength is 9-50N /
It is possible to obtain a light-weight structure or molded object of about ² mm ² .
As a result, the total weight of high-rise buildings or large civil engineering structures can be reduced to less than half.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.
The blending ratio of the lightweight refractory structural material of the present invention is changed to Tables 1, 2 and 3, and as the cement, a high-strength cement is used. The particle size generated in the process of becoming smoke residue is 40 ~
A hollow aggregate of 200 microns and an average of 100 microns having the following chemical composition and having the following chemical composition (abbreviated as MB in Tables 1 to 3) was used. In this example, a lightweight aggregate having an average specific gravity of about 1.25 was used.

[0007]

[Table 1]

[Table 2]

[Table 3]

[Table 4]

A product (test piece No. 28) with a material age of 28, which was kneaded and solidified with water in the proportions shown in Tables 1, 2 and 3
The specific gravity of (-1, 2, 3) and the compressive strength were as follows. Product Specific gravity Compressive 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, fire resistance of all test pieces was equal to 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, while having a specific gravity of about 1.0 or less, which is less than 1/2 that of the conventional concrete, it has sufficient strength similar to or close to that of the conventional concrete. The surface was hard, and the surface was not brittle and was excellent in abrasion resistance. By using this, the building weight of the building can be reduced by about half, and a low-cost and high-rise building can be realized. Further, the fire resistance can be improved by mixing gypsum. In addition, it can be used as a substitute for a conventional concrete product other than a building, and enables a lightweight molded article having excellent strength and fire resistance.

Continuation of the front page (51) Int.Cl. ⁷ identification code FI C04B 22:14) 111: 28 111: 40 (58) Investigated field (Int.Cl. ⁷ , DB name) C04B 28/02 C04B 38/08 C04B 18:08 C04B 14:02 C04B 111: 28 C04B 111: 40

Claims (2)

(57) [Claims] 1. A cement-based structural material containing cement and aggregate as main raw materials, wherein heat-resistant hollow microparticles are mixed at a ratio of 6 to 25% by weight, and have an average specific gravity of 1.5 or less. aggregate
30 to 55% by weight and 10 to 50% by weight of cement
And mix with gypsum at a rate of 10-25% by weight or more
And lightweight refractory structural material, characterized in that use by kneading with water. 2. 10 to 50% by weight of early strength cement, heat resistant
6-25% by weight of porous hollow granules and 10-25 weight of gypsum
% And mix the rest with a lightweight aggregate with an average specific gravity of 1.5 or less.
And a light refractory structural material characterized by being kneaded with water and used .