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dc.contributor.authorVickers, Les
dc.contributor.authorRickard, William D.A.
dc.contributor.authorvan Riessen, Arie
dc.date.accessioned2017-01-30T13:59:21Z
dc.date.available2017-01-30T13:59:21Z
dc.date.created2014-03-31T20:00:36Z
dc.date.issued2014
dc.identifier.citationVickers, Les and Rickard, William D.A. and van Riessen, Arie. 2014. Strategies to control the high temperature shrinkage of fly ash based geopolymers. Thermochimica Acta. 580: pp. 20-27.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/37056
dc.identifier.doi10.1016/j.tca.2014.01.020
dc.description.abstract

Strategies to control thermally induced shrinkage in fly ash based geopolymers are investigated. The useof low (<2) Si:Al ratios in the geopolymer provides superior thermal properties and the addition of fillers delivered additional improvements resulting in impressive thermal resistance. Two thermally stable inorganic fillers, α-alumina and wollastonite, were used because of their high melting points and relatively low thermal expansion. Shrinkage events at elevated temperatures revealed that samples containing filler exhibited 30–35% less volume shrinkage than the control at 1000 °C. Initial compressive strength was moderate (~30 MPa), but increased markedly when samples were fired in excess of 600 °C >100 MPa). Wollastonite addition also improved the flexural strength of the samples which was attributed to its acicular shape imparting fibre-like qualities. Microstructural investigations showed that unfired samples predominantly consisted of spherical particles coated with reaction product. Firing to 1000 °C converted the morphology to a more compact phase with increased pore size.

dc.publisherElsevier Science
dc.subjectShrinkage
dc.subjectFillers
dc.subjectGeopolymer
dc.subjectThermal analysis
dc.titleStrategies to control the high temperature shrinkage of fly ash based geopolymers
dc.typeJournal Article
dcterms.source.volume580
dcterms.source.startPage20
dcterms.source.endPage27
dcterms.source.issn00406031
dcterms.source.titleThermochimica Acta
curtin.department
curtin.accessStatusFulltext not available


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