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: Sak Sanchindapong, Chalermphan Narattha, Manow Piyaworapaiboon, Sakprayut Sinthupinyo, Prinya Chindaprasirt, Arnon Chaipanich
Format: Journal
Published: 2020
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http://cmuir.cmu.ac.th/jspui/handle/6653943832/70367
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Institution: Chiang Mai University
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spelling th-cmuir.6653943832-703672020-10-14T08:48:43Z Microstructure and phase characterizations of fly ash cements by alkali activation Sak Sanchindapong Chalermphan Narattha Manow Piyaworapaiboon Sakprayut Sinthupinyo Prinya Chindaprasirt Arnon Chaipanich Chemistry Physics and Astronomy © 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. 2020-10-14T08:28:27Z 2020-10-14T08:28:27Z 2020-10-01 Journal 15882926 13886150 2-s2.0-85088447144 10.1007/s10973-020-10021-5 https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85088447144&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/70367
institution Chiang Mai University
building Chiang Mai University Library
continent Asia
country Thailand
Thailand
content_provider Chiang Mai University Library
collection CMU Intellectual Repository
topic Chemistry
Physics and Astronomy
spellingShingle Chemistry
Physics and Astronomy
Sak Sanchindapong
Chalermphan Narattha
Manow Piyaworapaiboon
Sakprayut Sinthupinyo
Prinya Chindaprasirt
Arnon Chaipanich
Microstructure and phase characterizations of fly ash cements by alkali activation
description © 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.
format Journal
author Sak Sanchindapong
Chalermphan Narattha
Manow Piyaworapaiboon
Sakprayut Sinthupinyo
Prinya Chindaprasirt
Arnon Chaipanich
author_facet Sak Sanchindapong
Chalermphan Narattha
Manow Piyaworapaiboon
Sakprayut Sinthupinyo
Prinya Chindaprasirt
Arnon Chaipanich
author_sort Sak Sanchindapong
title Microstructure and phase characterizations of fly ash cements by alkali activation
title_short Microstructure and phase characterizations of fly ash cements by alkali activation
title_full Microstructure and phase characterizations of fly ash cements by alkali activation
title_fullStr Microstructure and phase characterizations of fly ash cements by alkali activation
title_full_unstemmed Microstructure and phase characterizations of fly ash cements by alkali activation
title_sort microstructure and phase characterizations of fly ash cements by alkali activation
publishDate 2020
url 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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