... /m3,700kg/m3.It has not the big grain ,main use silicon material (for example: coal ash , sand , stone dust and ... 3 of clay brick and 1/5 common concrete.So use the Light brick can reduce the weight of the build ... . Save more energywhen produce 10000 m3 light weight brick ,will use 4200 Ton coal ash ,and save coal ash using area ... clay brick 5 mu . High quality Aerated autoclaved concrete block machines