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Characterisation of class F fly ash geopolymer pastes immersed in acid and alkaline solutions

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Temuujin, Jadambaa
Minjigmaa, A.
Lee, Melissa
Chen-Tan, Nigel
Van Riessen, Arie
Date
2011
Type
Journal Article

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Temuujin, J. and Minjigmaa, A. and Lee, M. and Chen-tan, N. and van Riessen, A. 2011. Characterisation of class F fly ash geopolymer pastes immersed in acid and alkaline solutions. Cement and Concrete Composites. 33: pp. 1086-1091.
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Cement and Concrete Composites
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Department of Imaging and Applied Physics
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Abstract

Acid and alkaline resistance of class F fly ash based geopolymer pastes has been investigated. As prepared geopolymers showed high solubility in both strong alkali and acid solutions. Calcination of the fly ash based geopolymers at 600 C resulted in a decrease of amorphous component from 63.4 to 61.6 wt.%. However, the solubility of the Al, Si and Fe ions in 14 M NaOH and 18% HCl after 5 days immersion decreased from 1.3 to 16-fold in comparison to as prepared geopolymer samples. Calcination of the geopolymers also resulted in a 30% reduction in compressive strength. Acid and alkali resistance of the geopolymers investigated strongly depends on mineralogical composition change of the calcined geopolymer. Partial crystallisation of non-reacted fly ash particles in the geopolymer decreases its solubility in acid and alkali solutions.