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.