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Ambient Temperature Drying Shrinkage and Cracking in Metakaolin-Based Geopolymers
Article first published online: 20 AUG 2012
© 2012 The American Ceramic Society
Journal of the American Ceramic Society
Volume 95, Issue 10, pages 3270–3277, October 2012
How to Cite
Kuenzel, C., Vandeperre, L. J., Donatello, S., Boccaccini, A. R., Cheeseman, C. (2012), Ambient Temperature Drying Shrinkage and Cracking in Metakaolin-Based Geopolymers. Journal of the American Ceramic Society, 95: 3270–3277. doi: 10.1111/j.1551-2916.2012.05380.x
- Issue published online: 2 OCT 2012
- Article first published online: 20 AUG 2012
- Manuscript Accepted: 27 JUN 2012
- Manuscript Received: 1 NOV 2011
- UK EPSRC
- Spanish Ministry of Science and Innovation
- European Social Fund
Ambient temperature drying shrinkage in metakaolin-based geopolymer pastes exposed to low relative humidity environments has been investigated. The effect of varying the geopolymer composition (water content, Si:Al ratio, Na:Al ratio, and Na+ or K+ cations) on the sensitivity to ambient temperature drying shrinkage is reported. The definition of “structural” water as being the minimum water content required that prevents contractions in the gel structure, and thus drying shrinkage from occurring, is introduced. From the results presented, it is clear that the ionic charge density of cations, the total quantity of cations, and the relative quantities and stabilities of cation: AlO4− pairs in the paste are major factors affecting the sensitivity of pastes to ambient temperature drying shrinkage.