JPH05319951A - Production of light-weight cellular concrete - Google Patents

Abstract

(57) [Summary] [Purpose] AL using a water repellent with low cost and good dispersibility.
Manufacturing method of C. [Structure] 0.5% by weight of tetracyclodimethylsiloxane or pentacyclodimethylsiloxane and aluminum powder are added to a raw material mortar containing siliceous materials and calcareous materials as main components, and the mixture is poured into a mold and foamed. After curing, autoclave cure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing lightweight cellular concrete (hereinafter referred to as ALC).

[0002]

Although ALC has many advantages as a building material, it has a drawback that it has a high water absorption rate.

Water repellency is generally imparted to alleviate this drawback. Conventionally, in order to impart water repellency, polydimethylsiloxane (DMS) having a chain structure has been added to a mortar raw material of a hydraulic slurry mainly containing a siliceous material and a calcareous material. However, DMS has a drawback that it is extremely expensive as compared with mortar, has a relatively high viscosity, has poor dispersibility, and takes time to disperse.

The present invention is intended to solve the above-mentioned problems, and an object thereof is to reduce the cost of the water repellent used, the viscosity thereof, the dispersibility thereof, and the production thereof, as compared with the conventional DMS. It is to propose a manufacturing method of ALC which has many above advantages.

[0005]

[Means for Solving the Problems] This method for producing ALC is a method for producing ALC using mortar containing siliceous material and calcareous material as a main ingredient, and adding cyclic dimethylsiloxane which is liquid at room temperature to the raw material mortar. It is characterized by imparting water repellency.

The cyclic dimethylsiloxane used in this production method is a 4-membered ring or more, which is liquid at room temperature. Specifically, tetracyclodimethylsiloxane,
Examples include pentacyclodimethylsiloxane and hexacyclodimethylsiloxane. The amount added is about 0.1 to 2.0% by weight based on the ALC solid content. Tricyclodimethylsiloxane is not preferable because it shows a solid at room temperature.

[0007]

[Example] Silica stone 42.0%, Portland cement 32.0
%, Quick lime 6.0%, gypsum 2.0%, ALC crushed scraps 18%, mixed with the compounding water, the cyclic dimethylsiloxane was added to the raw material mortar, and the aluminum powder was further added, After injecting it into the mixture to foam it, it was cured in an autoclave at 180 ° C. for 8 hours. The one-sided water absorption of the obtained ALC was as shown in Table 1. Simultaneously with the examples, comparison was made between adding no water repellent and adding DMS.

[0008]

[Table 1]

* Measuring method of water absorption on one side: 10 cm x 10 cm
Absorbance of an ALC sample of × 10 cm immersed in 2 cm below the water surface for 24 hours.

[0010]

The method of manufacturing the ALC is as described above, and has the following effects.

Compared to DMS, cyclic dimethyl siloxane has
It is inexpensive and can reduce costs, has low viscosity and excellent dispersibility. In addition, it can exhibit a water-repellent performance that is equal to or close to that of DMS.

[0012]

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location C04B 18:16 2102-4G 22:14 B 2102-4G 24:40) 2102-4G

Claims (1)

[Claims] 1. A method for producing a lightweight cellular concrete using a mortar containing a siliceous material or a calcareous material as a main component, wherein cyclic dimethylsiloxane which is liquid at room temperature is added to the raw mortar to impart water repellency. A method for producing lightweight cellular concrete.