... different mould. Brief intruduction :QTJ4-25 block making machine is a kind of automatic product ,adopts flat vibration ... sand, cement, dust and coal fly ash, cinder, slag, gangue, gravel, perlite, and other industrial wastes.Applied Productsconcrete ... blocks, interlocking blocks, etc.Applied Fieldswidely used in buildings, road pavers, squares, gardens, landscaping, city constructions, etc. QTJ4 ...