Presented as part of the oral communication at the 13th Euroseminar on Microscopy Applied to Building Materials, 14–18 June 2011, Ljubljana, Slovenia (ISBN 978-961-90366-7-9).
TEM and SAED Characterization of Metakaolin. Pozzolanic Activity
Article first published online: 3 JUL 2012
© 2012 The American Ceramic Society
Journal of the American Ceramic Society
Special Issue: BIO 2011
Volume 95, Issue 9, pages 2989–2996, September 2012
How to Cite
Trusilewicz, L., Fernández-Martínez, F., Rahhal, V., Talero, R. (2012), TEM and SAED Characterization of Metakaolin. Pozzolanic Activity. Journal of the American Ceramic Society, 95: 2989–2996. doi: 10.1111/j.1551-2916.2012.05325.x
- Issue published online: 3 SEP 2012
- Article first published online: 3 JUL 2012
- Manuscript Accepted: 7 MAY 2012
- Manuscript Received: 5 DEC 2011
- Technical University of Madrid. Grant Number: RR01/2008
The present study deals with a characterization of metakaolin pozzolanic activity and its chemical character exhibited in the Ordinary Portland Cement (OPC) blends by means of Transmission Electron Microscopy (TEM) and Selected-Area Electron Diffraction (SAED) techniques principally. Metakaolin sample was prepared by calcination of kaolin rock (Guadalajara, Spain) at 780°C. Two OPC of different chemical composition from the tricalcium aluminate content point of view were chosen and Portland cement blends series elaborated and then submitted to the pozzolanic activity test (EN 196-5 or Frattini test). The main mineralogical components of the metakaolin are determined qualitatively: χ-alumina and quartz. The chemical character of the metakaolin is described because of its final composition as well as due to its Al atoms possible coordination. The crystalline order of the material is found to be of both amorphous and polycrystalline, being an intimate amorphous mixture of alumina and silica. Finally, all the alumina capable of reacting chemically is denominated and classified as reactive alumina component, Al2O3r−, of pozzolans, as well as the aluminic chemical character of metakaolin in OPC blends is once again proved and exhibited by means of Friedel's salt formation studied already at 4 h-age.