Ceramics-Silikáty 25, (4) 289 - 296 (1981) |
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A STUDY OF THE EFFECT OF pH ON THE FORMATION OF CALCIUM HYDROSILICATE COMPONENTS UNDER HYDROTHERMAL CONDITIONS
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Šauman Zdeněk 1, Hoffmann Oldřich 2, Kocuvan Ivan 3,
Uršič Jože 3
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1 Technical University, Department of Building Materials Technology, Gorkého 7, 662 38 Brno
2 Research Institute of Building Materials, Hněvkovského 65, 617 00 Brno
3 Salonit, Anhovo, Yugoslavia
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The calcium hydrosilicates of the tobermoritic group were prepared by hydrothermal treatment of a mixture of CaO with β-quartz in an aqueous suspension. The crystallization degree of the reaction product was positively affected by addition of SO₄2- and Al3+ ions. The pH was adjusted by addition of alkalies and the relationship between pH and the crystallization degree of the calcium hydrosilicate component was determined. Alkalies have been proved to have a negative effect on the formation of crystallically developed phases of the tobermoritic group. |
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