Thermal analysis of geopolymer pastes synthesised from five fly ashes of variable composition
This paper presents a study on the thermal properties of a range of geopolymers in order to assess their suitability for high temperature applications such as thermal barriers, refractories and fire resistant structural members. Geopolymers were synthesised from five different fly ashes using sodium...
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| Format: | Journal Article |
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Elsevier BV * North-Holland
2012
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| Online Access: | http://hdl.handle.net/20.500.11937/24694 |
| _version_ | 1848751500942114816 |
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| author | Rickard, William Temuujin, J. van Riessen, Arie |
| author_facet | Rickard, William Temuujin, J. van Riessen, Arie |
| author_sort | Rickard, William |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | This paper presents a study on the thermal properties of a range of geopolymers in order to assess their suitability for high temperature applications such as thermal barriers, refractories and fire resistant structural members. Geopolymers were synthesised from five different fly ashes using sodium silicate and sodium aluminate solutions to achieve a set range of Si:Al compositional ratios. The thermo-physical, mechanical and microstructural properties of the geopolymers are presented and the effect of the source fly ash characteristics on the hardened product is discussed, as well as implications for high temperature applications. The amount and composition of the amorphous component (glass) of each of the fly ashes was determined by combining XRD and XRF results. It was found that the Si:Al ratio in the glass of the fly ashes strongly influenced the thermal performance of the geopolymers. Geopolymers synthesised from fly ashes with a high Si:Al (=5) in the glass exhibited compressive strength gains and greater dimensional stability upon exposure to 1000 °C, whereas geopolymers synthesised from fly ashes with low Si:Al (<2) in the glass exhibited strength losses and reduced dimensional stability upon high temperature exposure. |
| first_indexed | 2025-11-14T07:53:43Z |
| format | Journal Article |
| id | curtin-20.500.11937-24694 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:53:43Z |
| publishDate | 2012 |
| publisher | Elsevier BV * North-Holland |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-246942017-09-13T15:12:59Z Thermal analysis of geopolymer pastes synthesised from five fly ashes of variable composition Rickard, William Temuujin, J. van Riessen, Arie fly ash density thermal properties geopolymer thermal expansion This paper presents a study on the thermal properties of a range of geopolymers in order to assess their suitability for high temperature applications such as thermal barriers, refractories and fire resistant structural members. Geopolymers were synthesised from five different fly ashes using sodium silicate and sodium aluminate solutions to achieve a set range of Si:Al compositional ratios. The thermo-physical, mechanical and microstructural properties of the geopolymers are presented and the effect of the source fly ash characteristics on the hardened product is discussed, as well as implications for high temperature applications. The amount and composition of the amorphous component (glass) of each of the fly ashes was determined by combining XRD and XRF results. It was found that the Si:Al ratio in the glass of the fly ashes strongly influenced the thermal performance of the geopolymers. Geopolymers synthesised from fly ashes with a high Si:Al (=5) in the glass exhibited compressive strength gains and greater dimensional stability upon exposure to 1000 °C, whereas geopolymers synthesised from fly ashes with low Si:Al (<2) in the glass exhibited strength losses and reduced dimensional stability upon high temperature exposure. 2012 Journal Article http://hdl.handle.net/20.500.11937/24694 10.1016/j.jnoncrysol.2012.05.032 Elsevier BV * North-Holland restricted |
| spellingShingle | fly ash density thermal properties geopolymer thermal expansion Rickard, William Temuujin, J. van Riessen, Arie Thermal analysis of geopolymer pastes synthesised from five fly ashes of variable composition |
| title | Thermal analysis of geopolymer pastes synthesised from five fly ashes of variable composition |
| title_full | Thermal analysis of geopolymer pastes synthesised from five fly ashes of variable composition |
| title_fullStr | Thermal analysis of geopolymer pastes synthesised from five fly ashes of variable composition |
| title_full_unstemmed | Thermal analysis of geopolymer pastes synthesised from five fly ashes of variable composition |
| title_short | Thermal analysis of geopolymer pastes synthesised from five fly ashes of variable composition |
| title_sort | thermal analysis of geopolymer pastes synthesised from five fly ashes of variable composition |
| topic | fly ash density thermal properties geopolymer thermal expansion |
| url | http://hdl.handle.net/20.500.11937/24694 |