Characterisation of class F fly ash geopolymer pastes immersed in acid and alkaline solutions |
| |
| Authors: | J. Temuujin A. Minjigmaa M. Lee N. Chen-Tan A. van Riessen |
| |
| Affiliation: | aCentre for Materials Research, Department of Imaging and Applied Physics, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia;bInstitute of Chemistry and Chemical Technology, Mongolian Academy of Sciences, Ulaanbaatar 51, Mongolia |
| |
| 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. |
| |
| Keywords: | Geopolymers Fly ash Phase transformation Calcination Chemical attack |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
