Ceramics-Silikáty 34, (3) 247 - 255 (1990) |
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STUDY OF THE EFFECT OF CHEMOGYPSUM AS SETTING RETARDER ON THE PROPERTIES OF CEMENT PASTES
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Šauman Zdeněk
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Technical University, Department of Building Materials Technology, Gorkého 7, 622 38 Brno
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Waste gypsum from chemical works contains various proportions of impurities according to the character of the respective production technology. If the chemogypsum is used as a setting retarder in portland cement, the hexafluorosilicates present exhibit considerable additional retarding effects with respect
to early strength, whereas the fluorides, such as CaF₂ , do not influence the hydration processes to any substantial degree. 'l'he early strengths of cement are mostly affected by Na₂SiF₆. |
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