... .inthe future ,they will replace the Clay brick completely . 2.Areated concrete common conception ... light weight Areated concrete density is usually 400-700kg/m3,(according the market tiproduce ),same as 1/3 of clay brick ... light weight brick ,will use 4200 Ton coal ash ,and savecoal ash using area 0.5 mu,save burning clay brick ... 5 mu . High quality Light weight block AAC plant