JPH02221169A - Production of lightweight inorganic product - Google Patents

Abstract

PURPOSE:To uniformly distribute materials and to obtain a product having uniform strength by adding a specified amt. of Al powder to a cement-silica compsn., further adding water and using the resulting slurry. CONSTITUTION:Al powder as starting material for reduction in weight is added to a cement-silica compsn. by 0.01-0.1wt.% of the amt. of the compsn. and water is further added to prepare a slurry. This slurry is molded into a platelike body by the conventional method, cured and hardened. In the case of <0.01wt.% Al powder, reduction in weight is not attained. In the case of >0.1wt.% Al powder, the weight of the Al powder itself affects increase in weight and the purpose is not attained. Since Al powder whose specific gravity is nearly equal to that of the cement-silica compsn. is used, the materials are uniformly mixed with ease and reduction in weight can be attained.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a method for manufacturing lightweight inorganic products.

[Conventional technology]

BACKGROUND ART Inorganic building boards formed from compositions made of cement and silica have been widely known.

This type of inorganic building board is non-combustible, so it has the advantage of greatly contributing to making buildings non-combustible. However, it has the problem of being heavy, and attempts have been made to reduce its weight. Various attempts have been made to achieve the above objective, such as by adding large quantities of materials.

[Problems with conventional technology]

By the way, when carrying out the above-mentioned weight reduction, porous lightweight aggregates such as perlite have a lower weight than other cement composition additives.
Since the specific gravity is extremely low, it tends to float when made into a slurry, and there is a problem that the lightweight aggregate cannot be uniformly distributed, resulting in insufficient strength.

Particularly, when producing a plate material having a thickness of 5 to 20 mmG, it is difficult to form hollow holes inside the temporary phase using, for example, extrusion molding, so there is a problem that the above-mentioned disadvantages are likely to occur.

[Problem to be solved by the invention]

The present invention has been made in view of the above-mentioned problems, with the object of providing a method for manufacturing a lightweight inorganic product that can uniformly distribute materials throughout the product and exhibit uniform strength.

[Technology that led to solving the problem]

That is, the method for manufacturing a lightweight inorganic product of the present invention uses aluminum powder as a lightweight raw material in a cement composition consisting of cement and silica, and the aluminum powder is added in an amount of 0.01 to 0.1% by weight based on the cement composition. It is characterized by adding water to form a slurry, which is then molded into a plate-shaped body by a conventional method, and cured and hardened.

[Effect]

In this invention, as the composition consisting of cement and silica, a conventional composition is used. For example, cement 3
The amount used is 5 to 45 parts by weight of silica and 35 to 50 parts by weight of silica.

The aluminum powder in this invention is added for the purpose of reducing the weight of the molded product, and since the aluminum powder itself has a small difference in specific gravity from other cement compositions, uniform mixing is more likely to be achieved.

The aluminum powder in the cement m-oxide foams during curing and introduces voids in the Mi fibers after hardening, achieving weight reduction.

The amount of the above aluminum powder added to 14 fl of cement was 0.
．． 0.01 to 0.1% by weight is 0.01 to 0.1% by weight. If the amount is less than the old model amount %, weight reduction will not be achieved, and if it is more than 0.1% by weight, the effect of adding the weight of the aluminum powder itself will occur, making it impossible to achieve the object of the present invention.

〔Example〕

Next, the present invention will be explained in detail.

For a cement composition containing 40 parts by weight of cement and 35 parts by weight of silica, 150 meshes of aluminum powder was added to the above cement composition. Add 0.1% to 0.1% by weight of O1, add 45% of water to make a slurry, and cast it to a size of 90cm x 90cm thick by casting.
〇- Steel plate material was obtained.

After curing and curing, the JIS No. 4 bending strength and specific gravity were measured, and the results were as shown in Table 1.

In addition, the comparative example shows one in which pearlite was added so as to have the same specific gravity as in the example, and a plate material was molded in the same manner as in the example.

Table 1 Indicates the amount of city barite added.

As is clear from Table 1, it was found that the strength was significantly superior when the specific gravity was the same.

〔effect〕

Claims (1)

[Claims] (1) Using aluminum powder as a lightweight raw material, adding 0.01 to 0.1% by weight of the aluminum powder to the cement composition,
A method for producing a lightweight inorganic product, which is characterized by adding water to form a slurry, forming a plate-like body by a conventional method, and curing and hardening.