P. Brown—contributing editor
Early Formation of Ettringite in Tricalcium Aluminate–Calcium Hydroxide–Gypsum Dispersions
Article first published online: 26 JAN 2007
Journal of the American Ceramic Society
Volume 90, Issue 2, pages 614–617, February 2007
How to Cite
Silva, D. A. and Monteiro, P. J. M. (2007), Early Formation of Ettringite in Tricalcium Aluminate–Calcium Hydroxide–Gypsum Dispersions. Journal of the American Ceramic Society, 90: 614–617. doi: 10.1111/j.1551-2916.2006.01384.x
Supported by the Brazilian government (CAPES grant BEX2368/02-1 and CNPq grant PQ307930/2003-3), and by the National Science Foundation and the Federal Highway Administration (grant CMS-981275). Research at XM-1 is supported by the United States Department of Energy, Office of Basic Energy Sciences under contract DE-AC 03-76SF00098.
- Issue published online: 26 JAN 2007
- Article first published online: 26 JAN 2007
- Manuscript No. 21247. Received December 12, 2005; approved September 8, 2006.
The formation of hydrates in dispersions of cubic tricalcium aluminate (C3A)–calcium hydroxide–gypsum was observed using soft X-ray transmission microscopy. This technique allows the continuous imaging of the hydration process without the introduction of drying artifacts. Within minutes, microcrystalline hydrates covered the C3A particles but over time large prismatic ettringite crystals are precipitated suppressing the microcrystalline hydrates. Within the resolution of the technique, no protective hydrated layer on the surface of C3A particles was observed.