A kind of fly ash autoclaved aerated concrete block and its production method

Abstract

The invention relates to the technical field of preparation of building materials and discloses fly ash autoclaved aerated concrete blocks and a production method thereof. The concrete blocks compriseraw materials including materials and water; the materials include, by weight, 3000-3500 parts of fly ash, 350-400 parts of lime, 250-320 parts of gypsum, 280-330 parts of cement, 2-4 parts of aluminum powder and 100-180 parts of admixture; the admixture includes a butyl acrylate / vinyl acetate / 2-acrylamide-2-methylpropanesulfonic acid terpolymer and calcium stearyl lactate. The concrete blocks and the production method thereof have the following advantages and effects that industrial waste slag fly ash is used as a raw material to reduce the discharge amount and protect the environment; the admixture in the raw materials not only improves the hydrophobicity of pores of the fly ash autoclaved aerated concrete blocks, reduces the amount of water absorbed from coated mortar, but also can effectively reduce the drying shrinkage value of the blocks, reduce the deformation amount of the blocks in a drying process, and the effects that the environment is protected, the drying shrinkage valueis low and phenomena such as cracking and hollowing after the blocks are built into a wall are achieved.

Description

technical field [0001] The invention belongs to the technical field of building material preparation, in particular to a fly ash autoclaved aerated concrete block and a production method thereof. [0002] technical background [0003] With the development of society and the huge consumption of energy, building energy conservation has become a worldwide trend, and there is also a new demand for new wall materials. Autoclaved aerated concrete is made of siliceous materials and calcareous materials as the main raw materials, mixed in proportion, blended, stirred with water, and added with an air-generating agent and other materials, and then poured, statically stopped, embryo body cut and steamed. A lightweight porous building material made by pressing and curing processes. Due to the advantages of low bulk density, thermal insulation, good shock resistance, and strong constructability, aerated concrete is mostly used as a filling wall and is widely used in the construction indu...

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Problems solved by technology

[0004] However, after the autoclaved aerated concrete blocks are built into a wall, the wall is prone to cracking

For example, Zhou Chunying and others pointed out in the research on the water absorption characteristics of autoclaved aerated concrete blocks published in the Journal of Wuhan University of Technology, Vol. The blocks directly absorb water from the mortar, which makes the mortar dry and difficult to hydrate and harden normally, resulting in a decrease in the bonding force between the mortar and the block, causing serious damage such as cracking, hollowing, and falling off of the mortar

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