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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...
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