Cracking and hollowing resistant aerated concrete water repellent and use method thereof

Abstract

The invention relates to a cracking and hollowing resistant aerated concrete water repellent and a use method thereof. The water repellent is one of the following materials of: an organic silicone emulsion water repellent, a metal soap powder, a polyacrylate emulsion water repellent, a polyvinyl ester emulsion water repellent and a paraffin wax emulsion water repellent. The use method of the water repellent comprises a first doping method and later doping method. According to the invention, through adding the water repellent to an aerated concrete raw material, the water absorbing rate as well as wet swelling and drying shrinkage phenomenon of the aerated concrete can be reduced, common cracking and hollowing problems in the using process of the traditional aerated concrete are solved, large-scale popularization and application of the aerated concrete are promoted, and important technical benefits are obtained.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an air-entrained concrete water-repellent agent for preventing cracking and hollowing and its usage. Background technique [0002] Air-entrained concrete is a lightweight, multi-functional and environmentally friendly building material that has been vigorously developed in my country. It has the advantages of light weight, heat preservation, heat insulation, sound absorption and sound insulation, earthquake resistance and fire prevention, and simple construction. It has a huge application prospect in our country. Compared with other advanced countries such as Poland, Germany, Japan, etc., the development and application of air-entrained concrete in China is relatively late, and there is a certain gap in technology. There is a lack of in-depth and detailed research on the air-entrained concrete block itself. The construction technology and quality control me...

AI Technical Summary

Problems solved by technology

Compared with other advanced countries such as Poland, Germany, Japan, etc., the development and application of air-entrained concrete in China is relatively late, and there is a certain gap in technology. There is a lack of in-depth and detailed research on the air-entrained concrete block itself. The construction technology and quality control measures are not perfect, which leads to the exposure of some common problems in the use of air-entrained concrete in our country. For example, due to the large porosity and high water absorption of air-entrained concrete, the It will absorb the moisture of the mortar, which will cause the loss of moisture in the mortar, affect the normal setting and hardening of the mortar, and eventually lead to serious hollowing of the air-entrained concrete and mortar layer, affecting the bonding of the aerated concrete and mortar, resulting in easy mortar layer Peeling and peeling; at the same time, in the process of releasing the absorbed water (mainly referring to the absorption of water in the mortar), due to the high porosity of the aerated concrete, the wet expansion and dry shrinkage are larger, while the dry shrinkage of the mortar is smaller, thus The shrinkage shear stress is formed between the air-entrained concrete and the mortar, which causes the surface of the mortar to crack and seriously affects the appearance of the mortar surface

Due to the above problems of air-entrained concrete, the popularization and application of air-entrained concrete is subject to certain restrictions.

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