| 摘要 |
The waterproof gypsum-foam body is manufactured by mixing burnt gypsum with 0.5-10 wt.% waterproofing agent and 0.5-10 wt.% calcium hydroxide to the dry powdered gypsum, mixing the mixt. with the foam made of water and foaming-agent, pouring it in a mould, drying at room temp., and demoulding. The foaming agent is polyvinyl alcohol, surfactant or their admixture and the waterproofing agent is the dry mixture powder of aqueous silicon resin and burnt gypsum.
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