To provide an inorganic board and a manufacturing method therefor realizing an improvement in the water permeability resistance of an inorganic board product without applying excess coating and an improvement in its productivity as the inorganic board obtained by spraying a surface layer raw material on the surface of a base layer mat, and a manufacturing method therefor.
In the inorganic board and the manufacturing method therefor, slurry having cement and a reinforcing fiber material as major components is caused to flow down in a form placed on a water permeable sheet and dehydrated to form a base layer, and a powdery mixture having the cement and the reinforcing fiber material as major part is sprayed and layered on the surface of the base layer, and dehydrated, aged and hardened to obtain the inorganic board. In such a case, the powdery raw material mixture in the surface layer contains flyash, an inorganic board recycled raw material and the reinforcing fiber material composed of short fibers and is sprayed and layered on the base layer.
HARADA TOMOYUKI
YAMANE TAKASHI
