... aac plant Henan zhengyi construction machinery Co.,Ltd is an entity of researching and producing machinery. We have our own ... of rational technical process, high-quality equipments and advanced technology.We undertake big and medium autoclaved aeroconcrete product turn-key project ... , sand aeroconcrete block Fly ash, shale, coal stone, mill tailings, ganged brick, paving brick, limesand brick, slope ...