a plant for manufacturing aerated concrete products includes a casting station where a quick - stiffening mixture is prepared and poured into a mold . to form the mold , a movable wall arrangement disposed at the casting station is temporarily united with a transportable mold bottom . after the poured mixture hardens to a semiplastic body , the semiplastic body is removed along with the mold bottom and another mold bottom is assembled with the wall arrangement to receive the next pouring of mixture . as a result , the capital investment required for the plant is minimized . wires on the wall arrangement may be used to automatically cut the semiplastic body into blocks . the stiffening time for forming the semiplastic body is kept short so that the pacing time between consecutive pourings can also be kept short . the semiplastic bodies on the mold bottoms are stacked on trucks which are guided by tracks to autoclaves at a steam curing station .