To obtain a composite hardened body useful as a core material provided with a reinforcing layer, a decorative layer, an electromagnetic layer, etc., on one side of the body as a composite building material by molding and hardening a material in which an organic fibrous material is formulated in an inorganic amorphous body containing an inorganic crystal.
This composite hardened body 1 is obtained by molding and hardening a material comprising an organic fibrous material 3 composed of a polysaccharide which is formulated in an inorganic amorphous body 2 which is an oxide base of at least two or more elements selected from the group consisting of Al, Si, Ca, Na, Mg, P, S, K, Ti, Mn, Fe and Zn, is preferably an Al2O3-SiO2-CaO base and contains an inorganic crystal such as calcium carbonate and is prepared, for example, by molding and hardening a paper making sludge being an industrial waste.
OGAWA TETSUJI
SATO KENJI
NOMURA TOSHIHIRO
