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...
Saved in:
Main Authors: | , , , , , |
---|---|
Format: | Journal |
Published: |
2020
|
Subjects: | |
Online Access: | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85088447144&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/70367 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Institution: | Chiang Mai University |
id |
th-cmuir.6653943832-70367 |
---|---|
record_format |
dspace |
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 |
_version_ |
1681752889868943360 |