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Published in:
2021 | OriginalPaper | Chapter
Influence of Raw Precursor on Mechanical Strength and Durability of Geopolymer Pastes in Sulfates
Authors : Mohamad Yusry Harman, Idawati Ismail, Yusuf Sahari
Published in: ICCOEE2020
Publisher: Springer Singapore
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Abstract
Fly ash and palm oil fuel ash (POFA) were used individually as a precursor to produce geopolymer paste samples. Both of the raw precursor were then mixed with 12 M sodium hydroxide solution to produce a hardened pastes. The pastes were oven cured at 60 °C for 24 h before being ambient cured to its testing age which were 7, 14 and 28 days. The liquid to binder ratio of fly ash and POFA geopolymer pastes was 0.30 and 0.40 respectively. Compressive strength test and sorptivity test were conducted on both geopolymer pastes. Durability in MgSO4 and Na2SO4 solutions were also conducted where compressive strength was recorded at the end of the test. Fly ash geopolymer pastes were found to achieve higher compressive strength compared to POFA geopolymer pastes. It also performs better in both sulfate solutions with lower strength loss compared to POFA geopolymer. Therefore, it can be concluded that fly ash performs better as a raw precursor for geopolymer compared to POFA.