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An investigation of major factor of influence of strength gain or loss of geopolymer when exposed to 800° C
conference contribution
posted on 2009-01-01, 00:00 authored by Z Pan, J G Sanjayan, Frank CollinsFrank Collins, B V RanganWhen fly ash based geopolymer mortars were exposed to an elevated temperature of 800oC, it was found that the strength after the exposure sometimes decreased, but at other times increased compared to the original strength. The aim of this investigation is to find the reason for this contrasting behaviour. Fol-lowing exposure to high temperature, residual strengths of specimens prepared with two different fly ashes, with initial strengths ranging from 5MPa to 60MPa, were investigated. The parameter that was found to have a major influence on the contrasting behaviour was the ductility of the mortars. The results indicate that the higher the ductility the lower the strength loss. This correlation is attributed to the fact that mortars with high ductility could provide higher capacity to accommodate thermal incompatibility than mortars with low ductil-ity. Beyond the particular threshold of ductility, some mortars even increased strength after the exposure, pos-sibly due to sintering.
History
Event
Mechanics of Structures and Materials. Australasian Conference (20th : 2008 : Toowoomba, Queensland)Pagination
211 - 217Publisher
CRC PressLocation
Toowoomba, QueenslandPlace of publication
London, Eng.Start date
2008-12-02End date
2008-12-05ISBN-13
9780415491969Language
engPublication classification
E1.1 Full written paper - refereed; E Conference publicationCopyright notice
2009, Taylor & FrancisEditor/Contributor(s)
T Aravinthan,, W Karunasena, H WangTitle of proceedings
ACMSM20 2011 : Proceedings of the 20th Australasian Conference on the Mechanics of Structures and Materials : Futures in mechanics of structures and materialsUsage metrics
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