無水石膏系プラスターの研究 (第1報)

概要

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Action of various electrolytes of sulphate salts on anhydrous gypsum plaster was systematically investigated. Powder of natural and reclaimed crystal gypsum was calcined at 400, 500, 700, and 1000°C for 1 hour, and kneaded with 1% solution of various sulphates of 1-3 valency metal, e.g., simple salt Na2SO4, ZnSO4, Al2(SO4)3, mixture of these two or three salts of K-, NH4-, Fe-, Al-alum. From many results of comparative tests. Al2(SO4)3, ZnSO4 and K-Al-alum or Fe-NH4- alum were observed to be better addition agent than other salts, for the properties of compressive strength, hardness, etc. of hardened anhydrous gypsum plaster. Na2SO4 was observed to be un suitable agent by the bad effect of efflorescence in any case of simple or mixed use with other sulphate. The addition of hard soluble CaO or CaSO4. 2H2O was also to be undesirable admixture. and the effect of CaSO4. 1/2H2O addition agent is now being studied, which result will be hereafter reported in the following report.
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