Thermally induced microstructural changes in fly ash geopolymers: Experimental results and proposed model
dc.contributor.author | Rickard, William | |
dc.contributor.author | Kealley, Cat | |
dc.contributor.author | Van Riessen, Arie | |
dc.date.accessioned | 2017-01-30T15:29:07Z | |
dc.date.available | 2017-01-30T15:29:07Z | |
dc.date.created | 2015-10-29T04:09:52Z | |
dc.date.issued | 2015 | |
dc.identifier.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. | |
dc.identifier.uri | http://hdl.handle.net/20.500.11937/46756 | |
dc.identifier.doi | 10.1111/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.publisher | Blackwell Publishing Inc. | |
dc.title | Thermally induced microstructural changes in fly ash geopolymers: Experimental results and proposed model | |
dc.type | Journal Article | |
dcterms.source.volume | 98 | |
dcterms.source.number | 3 | |
dcterms.source.startPage | 929 | |
dcterms.source.endPage | 939 | |
dcterms.source.issn | 0002-7820 | |
dcterms.source.title | Journal of the American Ceramic Society | |
curtin.department | Department of Medical Radiation Sciences | |
curtin.accessStatus | Fulltext not available |