| abstract |
A composite hardened product, characterized in that it is produced by hardening a sludge from papermaking, comprises an inorganic amorphous product comprising one or more oxides of one or more elements selected from Si, Al and Ca and a fibrous article being admixed therein, and the scattering of specific gravity values within one piece of the composite hardened product is 10 % to +10 % of an average specific gravity. The composite hardened product is excellent in processability and productivity, has high flexural strength and compressive strength and free from the occurrence of exfoliation or warpage. |