This study was funded by CIMPOR. Authors thank for it.
Alkaline Hydration of Tricalcium Aluminate
Article first published online: 16 JUL 2012
© 2012 The American Ceramic Society
Journal of the American Ceramic Society
Volume 95, Issue 10, pages 3317–3324, October 2012
How to Cite
Sánchez-Herrero, M. J., Fernández-Jiménez, A., Palomo, A. (2012), Alkaline Hydration of Tricalcium Aluminate. Journal of the American Ceramic Society, 95: 3317–3324. doi: 10.1111/j.1551-2916.2012.05348.x
- Issue published online: 2 OCT 2012
- Article first published online: 16 JUL 2012
- Manuscript Accepted: 6 JUN 2012
- Manuscript Received: 15 MAR 2012
This study explored the behavior of laboratory-synthesized tricalcium aluminate (C3A) in alkaline media. In all the trials, the C3A was hydrated with water containing a certain percentage of alkali activators (4% Na2CO3, 4% Na2SO4, or 8% Na2SO4 by weight of C3A). Two- and 28-day mechanical strength values were determined and the products were characterized with XRD, DTA, and NMR. The compressive strength of the C3A pastes rose in the presence of the alkaline activators used in this study. The alkalis induced the formation of calcium monocarboaluminate (C4AČH11) as the main hydration product in all cases. In addition, when Na2SO4 was added, a sodium calcium sulfoaluminate, phase U (C4AŠNH16), formed. The presence of this mineral, whose formation is associated with high pH values, furnished indirect information on the alkalinity in the medium.