Microstructure and phase characterizations of fly ash cements by alkali activation
© 2020, Akadémiai Kiadó, Budapest, Hungary. Microstructure and phase characterizations of fly ash cement by alkali activation were investigated. High calcium fly ash (FA) at 70%, 80%, 90% and 100% by mass of binders was used in combination with Portland cement (PC), thus producing alkali-activated f...
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| Main Authors: | , , , , , |
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| 格式: | 雜誌 |
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2020
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| 在線閱讀: | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85088447144&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/70367 |
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| 總結: | © 2020, Akadémiai Kiadó, Budapest, Hungary. Microstructure and phase characterizations of fly ash cement by alkali activation were investigated. High calcium fly ash (FA) at 70%, 80%, 90% and 100% by mass of binders was used in combination with Portland cement (PC), thus producing alkali-activated fly ash cements with some part of Portland cement and geopolymer (at 100%FA). Alkali solutions (Na2SiO3 and NaOH) were used as activators at alkali liquid/binder of 0.65, and Na2SiO3/NaOH ratio used was 0.67. Samples were cured at 23 °C (55% RH) and 60 °C (95% RH). The results showed that curing temperature significantly affects the reacted products. By curing at higher temperature ≈ 60 °C, a denser structure due to high-temperature curing plays a crucial role in terms of producing more semi-crystalline (N–A–S–H) structure as characterized by X-ray diffraction. Moreover, higher-temperature curing gave higher compressive strength than curing at 23 °C in all mixes. Optimum compressive strength obtained at 23 °C and 60 °C curing samples was found in 80FA20PC and 100FA samples, respectively. Thermal analysis results showed that N–A–S–H/(N, C)–A–S–H was detected in all mixes. Scanning electron microscope and energy-dispersive X-ray showed elements belong to N–A–S–H and (N, C)–A–S–H phases. |
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