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    Thermal analysis of geopolymer pastes synthesised from five fly ashes of variable composition

    Access Status
    Fulltext not available
    Authors
    Rickard, William
    Temuujin, J.
    van Riessen, Arie
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Rickard, William D.A. and Temuujin, Jadambaa and van Riessen, Arie. 2012. Thermal analysis of geopolymer pastes synthesised from five fly ashes of variable composition. Journal of Non-Crystalline Solids. 358 (15): pp. 1830-1839.
    Source Title
    Journal of non-crystalline solids
    DOI
    10.1016/j.jnoncrysol.2012.05.032
    ISSN
    0022-3093
    URI
    http://hdl.handle.net/20.500.11937/24694
    Collection
    • Curtin Research Publications
    Abstract

    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.

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