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    Thermally induced microstructural changes in fly ash geopolymers: Experimental results and proposed model

    Access Status
    Fulltext not available
    Authors
    Rickard, William
    Kealley, Cat
    Van Riessen, Arie
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Rickard, W. and Kealley, C. and Van Riessen, A. 2015. Thermally induced microstructural changes in fly ash geopolymers: Experimental results and proposed model. Journal of the American Ceramic Society. 98 (3): pp. 929-939.
    Source Title
    Journal of the American Ceramic Society
    DOI
    10.1111/jace.13370
    ISSN
    0002-7820
    School
    Department of Medical Radiation Sciences
    URI
    http://hdl.handle.net/20.500.11937/46756
    Collection
    • Curtin Research Publications
    Abstract

    This study presents a proposed model for thermally induced microstructural changes in fly ash geopolymers. Two paste mixes with different as-cured microstructures are evaluated for thermal resistance. One mix was a highly reacted, high-strength geopolymer with a compact microstructure and the other mix had higher degree of unreacted fly ash resulting in a low strength, low-density geopolymer. Changes in the microstructure and bulk properties for each formulation were assessed at 100C temperature intervals up to 1000C using SEM, Q-XRD and physical testing. It was observed that the higher density and apparent lower permeability of the high-strength geopolymer led to it being more vulnerable to dehydration damage. Dimensional and phase changes also caused further strength losses before sintering at higher temperatures promoted strength gains. The low-strength geopolymer was not damaged by dehydration and was better able to accommodate volumetric changes; hence it exhibited an increase in strength after thermal exposure due to the sintering. From these results and others in the literature, a model has been proposed for thermally induced changes in fly ash geopolymers.

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