| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide various techniques related to gypsum, particularly the techniques for enhancing the strength of a product obtained by hydration of burnt gypsum so-called gypsum itself, developing the strength by hardening a crystalline gypsum or gypsum dihydrate as it is without burning; and making strength express by hardening a waste gypsum board without burning. Ž<P>SOLUTION: The invention relates to the technique for producing a lightweight high-strength gypsum, and the developed technique for hardening a waste gypsum without burning. An aqueous silicic acid solution is used in any case. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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