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dc.contributor.authorRickard, William
dc.contributor.authorKealley, Cat
dc.contributor.authorVan Riessen, Arie
dc.date.accessioned2017-01-30T15:29:07Z
dc.date.available2017-01-30T15:29:07Z
dc.date.created2015-10-29T04:09:52Z
dc.date.issued2015
dc.identifier.citationRickard, 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.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/46756
dc.identifier.doi10.1111/jace.13370
dc.description.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.

dc.publisherBlackwell Publishing Inc.
dc.titleThermally induced microstructural changes in fly ash geopolymers: Experimental results and proposed model
dc.typeJournal Article
dcterms.source.volume98
dcterms.source.number3
dcterms.source.startPage929
dcterms.source.endPage939
dcterms.source.issn0002-7820
dcterms.source.titleJournal of the American Ceramic Society
curtin.departmentDepartment of Medical Radiation Sciences
curtin.accessStatusFulltext not available


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