Air-entrained concrete block and preparation method thereof

Abstract

The invention discloses a method for preparing an aerated concrete block. The method comprises the following steps: (1) adding fly ash and calcium oxide into a solid waste obtained by wastewater treatment, stirring uniformly, drying and crushing to obtain sludge for later use; (2) adding water to the sludge for later use, tailings, cement, lime, gypsum and aluminum powder, and sufficiently mixing to obtain a mixture, wherein the feeding sequence is sludge for later use, tailings, Chinese honey locust powder, water, cement, lime, gypsum and aluminum powder; (3) pouring the mixture, curing for at least 3 hours, and cutting into blocks; and (4) performing autoclaved curing, namely adopting pulse type steam curing. The tailings, cement, lime and solid waste obtained by wastewater treatment are mainly used as raw materials, so that tailing resources are sufficiently utilized, meanwhile, the solid waste (namely sludge) obtained by wastewater treatment is sufficiently utilized, the sludge recycling requirement is met, and the method has positive practical significance.

Description

technical field [0001] The invention relates to an aerated concrete block and a preparation method thereof. Background technique [0002] Air-entrained concrete block is a new type of building material that is lightweight, porous, thermal insulation, good fire resistance, nailable, sawable, planable, and has certain earthquake resistance. As early as the early 1930s, my country began to produce this product, and it was widely used in high-rise and low-rise buildings. Aerated concrete block is an excellent new building material, and has the advantages of environmental protection, so it has been widely used. In the prior art, there are three main raw materials for domestically prepared aerated concrete blocks: one is cement-slag-sand, the other is cement-lime-fly ash, and the third is cement-lime-sand. These raw materials have a wide range of sources and low cost, so they have been widely used on the premise of satisfying the calcium-silicon ratio of aerated concrete blocks....

AI Technical Summary

Problems solved by technology

However, the inventor found experimentally that when the proportion of calcium sulfate in the sediment exceeds 5%, the air-entrained concrete block made by the existing technology will loosen or even collapse, and finally cannot form a qualified block