| 摘要 |
PROBLEM TO BE SOLVED: To obtain the lightweight hardened body highly resistant to freezing damage, without the sp.gr. being locally deviated, high in mechanical strength and capable of being finished homogeneously and densely by mixing a hydrophilic and substantially sublimable substance in a hydraulic material as a weight-reducing material, slurrying the mixture, compacting the slurry and hardening the compact. SOLUTION: A hydrophilic and substantially sublimable substance as a weight-reducing material (the surface is coated with a hydrophilic inorg. material of resin when poor in hydrophilicity) having 10-200μm grain diameter by 40-150 pts.wt. and an additive such as a reinforcement, aggregate and filler, as required, are mixed in 100 pts.wt. of a hydraulic material as the main raw material, and 50-200 pts.wt. of water is added to slurry the mixture. The slurry is compacted into a desired shape, the compact is pressed at 50-200kg/cm<2> pressure, heated, cured and hardened. The sublimable substance is sublimated simultaneously with, before or after the curing to obtain a lightweight hardened body.
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