ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 25, (4) 297 - 307 (1981)


THE CONDITIONS OF FORMATION AND STABILITY OF THE CARBONATE COMPLEX (C₃A . CaCO₃ . nH₂O) UNDER HYDROTHERMAL CONDITIONS
 
Šauman Zdeněk 1, Hoffmann Oldčich 2, Kocuvan Ivan 3, Uršič Jože 3
 
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

The carbonate complex (3 CaO . Al₂O₃ . CaCO₂ . nH₂O) was found to be formed in the optimum way under hydrothermal conditions (at 181 °C) in the presence of Ca(OH)₂ in a paste mix consistency. The presence of β-quartz, power station flyash, cement or 11 Å-tobermorite affects negatively formation of the complex, and when this has already existed in the system, the components even show a decomposing effect. The results obtained have confirmed the earlier assumption in the sense that the carbonate complex cannot be formed under the conditions of the manufacturing technology of high-pressure cured lime-silicate materials including asbestos cement.


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