Aerated concrete block and preparation method thereof

The invention discloses a preparation method of aerated concrete blocks. The method comprises the steps as follows: adding a proper amount of alkaline substance into coal ash, and then performing high-pressure steaming on the coal ash, so as to obtain the aerated concrete blocks. The invention also provides an aerated concrete block prepared through the preparation method. The aerated concrete block and the preparation method thereof have the benefits that ingredients and chemical characteristics of the coal ash are sufficiently utilized, so as to ensure that the coal ash is sufficiently converted into tobermorite to the greatest extent during chemical reaction, the strength and density of block products are greatly improved, the product performance is improved, product percent of pass is greatly improved and can reach more than 98.5 percent, while the industrial average percent of pass is only about 75 percent, the rate of multipurpose utilization of the coal ash particularly poor-quality coal ash is greatly improved, the mixing amount of the coal ash in the domestic industrial technology is about 60 percent, while according to the method, the mixing amount of the coal ash can reach more than 75 percent.