Autoclaved aerated concrete brick prepared by utilizing pulverized fuel ash and preparation method thereof

Abstract

The invention provides an autoclaved aerated concrete brick prepared by utilizing pulverized fuel ash and a preparation method thereof. The brick is prepared from the following materials by weight percent: 65%-68% of pulverized fuel ash, 17%-23% of lime, 6%-10% of cement, 2%-4% of desulfurization gypsum, 1%-1.5% of water-soluble aluminum powder, 0.5% of fatty acid soap and 0.5% of gleditsia sinensis powder. The preparation method comprises steps of: adding water to pulverized fuel ash and desulfurization gypsum which are screened mechanically and grinding together to form slurry, wherein the fineness of the pulverized fuel ash has to reach the condition that the residual of a 0.08mm square hoe sieve is not more than 15%; carrying out stirring, pouring, cutting and thermal, static and suspension curing on the slurry together with the lime, the cement and the aluminum powder suspension liquid which are weighed according to a weight ratio of a formula; utilizing an autoclave with good sealing for heating with 180-200 DEG C saturated steam under proper pressure (1.0-1.2Mpa); and steam curing for 8-10 hours so as to produce the aerated concrete brick. The aerated concrete brick has the characteristics of light weight, high strength, good heat insulation performance, good fire resistance and sound absorption, labor saving and energy saving, waste recycling and the like; and the aerated concrete brick meets constructional engineering requirements and environment protection requirements, and the wastes of enterprises are reasonably used.

Description

technical field [0001] The invention relates to a building material, in particular to an autoclaved aerated concrete brickwork made of fly ash and a preparation method thereof. Background technique [0002] Fly ash is the fine ash collected from the flue gas after coal combustion. Fly ash is the main solid waste discharged from coal-fired power plants. With the development, the discharge of fly ash from coal-fired power plants is increasing year by year; if a large amount of fly ash is not treated, it will generate dust and pollute the atmosphere; and biological hazards. [0003] The disposal cost of fly ash is high, and the investment in new waste ash dams is large. With the increasing improvement of national groundwater pollution prevention and control and solid waste pollution prevention and control regulations, the environmental protection requirements for new waste ash dams will be stricter in the future, and the investment in new waste ash dams The cost will be much ...

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Problems solved by technology

[0005] Patent 200710048429.8, patent 201110091801.X, patent 200710056106.3, 201010247058.8, etc. mentioned the use of waste sand, the production and preparation methods of aerated concrete blocks, etc., but either due to the different ratio of raw materials or different production purposes, the powder cannot be used Used in coal ash recycling

Moreover, due to the increase in the proportion of cement and aluminum powder, the environmental pollution is also greater, and the use of no additives makes the product stability and reliability not up to standard, affecting the service life of the product

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