Correlation between initial SiO2/Al2O3, Na2O/Al2O3, Na2O/SiO2 and H2O/Na2O ratios on phase and microstructure of reaction products of metakaolin-rice husk ash geopolymer
作者： K. Juengsuwattananon , F. Winnefeld , P. Chindaprasirt , K. Pimraksa
DOI: 10.1016/J.CONBUILDMAT.2019.07.146
关键词:
摘要: Abstract Phase evolution and microstructure development of metakaolin-rice husk ash geopolymer have been investigated. The initial molar ratios SiO2/Al2O3 were designed in the range 2.0–7.0 with Na2O/Al2O3 0.6–1.6, Na2O/SiO2 0.20–0.72 H2O/Na2O 10.0–20.0. specimens cured at 30 °C for 1–90 days prior to characterization phase as well mechanical properties. found correlate reaction products related their compressive Various zeolite types (sodalite, A, Y, X faujasite) prominently observed samples containing low (2.0–2.5) Na2O/Al2O3 ≥ 1.0 These provided strength geopolymer. Formation geopolymeric structures was established higher ratio (3.0–4.0) 1.0 10.0–15.0. highest achieved when SiO2/Al2O3, 4.0, 10.0, respectively. When increased 6.0–7.0 1.0–1.6 10.0–15.0, sodium bicarbonate compounds unreacted raw materials within structures. Correlation different starting chemical compositions evaluated revealed a ternary composition diagram.
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