Effects of slag content on the residual mechanical properties of ambient air-cured geopolymers exposed to elevated temperatures
This paper presents the effects of various slag contents on the residual compressive strength and physical properties of ambient air-cured fly ash-slag blended geopolymers after exposure to various elevated temperatures up to 800°C. The results showed an increasing trend in the compressive strength...
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| Format: | Journal Article |
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Taylor & Francis
2018
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| Online Access: | http://hdl.handle.net/20.500.11937/72766 |
| _version_ | 1848762836596031488 |
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| author | Shaikh, Faiz |
| author_facet | Shaikh, Faiz |
| author_sort | Shaikh, Faiz |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | This paper presents the effects of various slag contents on the residual compressive strength and physical properties of ambient air-cured fly ash-slag blended geopolymers after exposure to various elevated temperatures up to 800°C. The results showed an increasing trend in the compressive strength of ambient air-cured geopolymers with increase in the slag contents after exposure to 400 and 600°C temperatures. This trend deviated, however, at 800°C. Nevertheless, all the geopolymers showed reductions in control compressive strength at ambient temperature after exposure to elevated temperatures. The reductions were much higher at 600 and 800°C compared to 400°C. All the geopolymers exhibited significant damage in terms of cracking after exposure to a temperature of 800°C compared to 400 and 600°C and significant damage occurred at slag contents of 15–30%. Scanning electron microscopic (SEM) images of the above geopolymers also showed higher porosity at 800°C compared to 400 and 600°C. Traces of calcite/calcium silicate hydrate (CSH) peaks are observed in the X-ray diffraction (XRD) analysis of fly ash-slag geopolymers, and the intensity of those peaks increased with increases in slag contents. After exposure to elevated temperatures, the calcite/CSH peaks disappeared and new phases of nepheline and gehlenite were formed at 800°C in all the fly ash-slag geopolymers. |
| first_indexed | 2025-11-14T10:53:54Z |
| format | Journal Article |
| id | curtin-20.500.11937-72766 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:53:54Z |
| publishDate | 2018 |
| publisher | Taylor & Francis |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-727662019-09-24T08:14:22Z Effects of slag content on the residual mechanical properties of ambient air-cured geopolymers exposed to elevated temperatures Shaikh, Faiz This paper presents the effects of various slag contents on the residual compressive strength and physical properties of ambient air-cured fly ash-slag blended geopolymers after exposure to various elevated temperatures up to 800°C. The results showed an increasing trend in the compressive strength of ambient air-cured geopolymers with increase in the slag contents after exposure to 400 and 600°C temperatures. This trend deviated, however, at 800°C. Nevertheless, all the geopolymers showed reductions in control compressive strength at ambient temperature after exposure to elevated temperatures. The reductions were much higher at 600 and 800°C compared to 400°C. All the geopolymers exhibited significant damage in terms of cracking after exposure to a temperature of 800°C compared to 400 and 600°C and significant damage occurred at slag contents of 15–30%. Scanning electron microscopic (SEM) images of the above geopolymers also showed higher porosity at 800°C compared to 400 and 600°C. Traces of calcite/calcium silicate hydrate (CSH) peaks are observed in the X-ray diffraction (XRD) analysis of fly ash-slag geopolymers, and the intensity of those peaks increased with increases in slag contents. After exposure to elevated temperatures, the calcite/CSH peaks disappeared and new phases of nepheline and gehlenite were formed at 800°C in all the fly ash-slag geopolymers. 2018 Journal Article http://hdl.handle.net/20.500.11937/72766 10.1080/21870764.2018.1529013 http://creativecommons.org/licenses/by/4.0/ Taylor & Francis fulltext |
| spellingShingle | Shaikh, Faiz Effects of slag content on the residual mechanical properties of ambient air-cured geopolymers exposed to elevated temperatures |
| title | Effects of slag content on the residual mechanical properties of ambient air-cured geopolymers exposed to elevated temperatures |
| title_full | Effects of slag content on the residual mechanical properties of ambient air-cured geopolymers exposed to elevated temperatures |
| title_fullStr | Effects of slag content on the residual mechanical properties of ambient air-cured geopolymers exposed to elevated temperatures |
| title_full_unstemmed | Effects of slag content on the residual mechanical properties of ambient air-cured geopolymers exposed to elevated temperatures |
| title_short | Effects of slag content on the residual mechanical properties of ambient air-cured geopolymers exposed to elevated temperatures |
| title_sort | effects of slag content on the residual mechanical properties of ambient air-cured geopolymers exposed to elevated temperatures |
| url | http://hdl.handle.net/20.500.11937/72766 |