Thermal analysis and microstructure of Portland cement-fly ash-silica fume pastes |
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| Authors: | Arnon Chaipanich Thanongsak Nochaiya |
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| Institution: | (1) Cement and Concrete Research Laboratory, Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand |
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| Abstract: | Thermal analysis (thermogravimetry and differential thermal analysis) was used with scanning electron microscopy technique
to investigate the hydration mechanisms and the microstructure of Portland cement-Fly ash-silica fume mixes. Calcium silicate
hydrate (C–S–H), ettringite, gehlenite hydrate (C2ASH8), calcium hydroxide (Ca(OH)2) and calcium carbonate (CaCO3) phases were detected in all mixes. In the mixes with the use of silica fume addition, there is a decrease in Ca(OH)2 with increasing silica fume content at 5 and 10% compared to that of the reference Portland-fly ash cement paste and a corresponding
increase in calcium silicate hydrate (C–S–H). |
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