Characterisation of class F fly ash geopolymer pastes immersed in acid and alkaline solutions
Characterisation of class F fly ash geopolymer pastes immersed in acid and alkaline solutions
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DOI：
10.1016/j.cemconcomp.2011.08.008
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发表时间：
2011-11
影响因子：
10.5
通讯作者：
J. Temuujin;A. Minjigmaa;Melissa Lee;Chen-Tan Nigel;A. Riessen
中科院分区：
文献类型：
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作者：
J. Temuujin;A. Minjigmaa;Melissa Lee;Chen-Tan Nigel;A. Riessen
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 61.6wt.%. However, the solubility of the Al, Si and Fe ions in 14M NaOH and 18% HCl after 5days 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.
