Method for producing autoclaved aerated concrete from double siliceous raw materials

Abstract

The invention discloses a method for producing autoclaved aerated concrete from double siliceous raw materials. The autoclaved aerated concrete is mainly prepared by taking two siliceous raw materials of quartz sand and fly ash, cement, quick lime and gypsum powder as main raw materials, doping with aluminum powder paste serving as foaming agent, and preparing the autoclaved aerated concrete according to the conventional autoclaved aerated concrete process. The autoclaved aerated concrete is prepared from the following components by weight percent: 30%-36% of the quartz sand, 32%-38% of the fly ash, 7%-13% of the cement, 16%-22% of the quick lime and 2%-4% of the gypsum powder as well as the aluminum powder paste with the doping amount of 0.05-0.07%, wherein the ratio between water and the materials is 0.5-0.55. By using the two siliceous raw materials of the quartz sand and the fly ash as aggregates for preparing the autoclaved aerated concrete, the invention can greatly improve the quality of the autoclaved aerated concrete product and reduce the production cost thereof at the same time, thus effectively controlling the cost.

Description

technical field [0001] The invention relates to a production process of autoclaved aerated concrete, in particular to a production method of autoclaved aerated concrete produced from double siliceous raw materials. Background technique [0002] Autoclaved aerated concrete is made of siliceous materials (sand, fly ash and silicon-containing tailings, etc.) The voids are formed by chemical reaction, and the porous silicate products are made through casting molding, pre-curing cutting, autoclaving curing and other processes. Its main chemical reaction principle is: XCaO+YSiO 2 +ZH 2 O→XCaO·YSiO 2 ·ZH 2 O (C-S-H); CaO+H 2 O+Al→Ca(OH) 2 +Al(OH) 3 +H 2 . At present, there are three main production processes of autoclaved aerated concrete in China: the first one uses quicklime + cement (cement) and quartz sand (aggregate) as the main raw materials, and grinds the sand and water into powder; the second one, Use cement (cement) and quartz sand (aggregate) as the main raw ma...

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Problems solved by technology

Among them, the first and second processes require grinding of quartz sand, resulting in higher production costs (10% to 30% higher than the third process); and the problem of the third process is that the main component of fly ash is SiO 2 The content is low and unstable, resulting in poor physical properties of the product (freeze resistance, drying shrinkage value), low compressive strength (only qualified products can be produced, and superior products cannot be produced), and unstable

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