粉煤灰双免化学砖与普通粘土砖及其他种类粉煤灰砖相比具有许多特点：①耗能低，该砖机械用电折合煤耗为１２０公斤／万块，比普通粘土烧结砖耗标准煤减少９１％；②吸水率低，样品投入水中１８个月，围层浸水仅１ｃｍ，而粘土烧结砖２４小时即全部被浸透；③抗风化能力强；④? The fly ash double-free chemical bricks have many characteristics compared with common clay bricks and other types of fly ash bricks: 1 Low energy consumption, the brick machine uses electricity converted coal consumption is 120 kg / 10,000, than the ordinary clay sintered brick consumption standards The coal is reduced by 91%; 2 The water absorption rate is low, the sample is put into the water for 18 months, the water in the surrounding layer is only 1cm, and the clay brick is fully saturated in 24 hours; 3 The weather resistance is strong; 4?