Toward an indexing approach to evaluate fly ashes for geopolymer manufacture

Zhang, Zuhua, Provis, John L., Zou, Jin, Reid, Andrew and Wang, Hao (2016) Toward an indexing approach to evaluate fly ashes for geopolymer manufacture. Cement and Concrete Research, 85 163-173. doi:10.1016/j.cemconres.2016.04.007

Author Zhang, Zuhua
Provis, John L.
Zou, Jin
Reid, Andrew
Wang, Hao
Title Toward an indexing approach to evaluate fly ashes for geopolymer manufacture
Journal name Cement and Concrete Research   Check publisher's open access policy
ISSN 0008-8846
Publication date 2016-07-01
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.cemconres.2016.04.007
Open Access Status Not Open Access
Volume 85
Start page 163
End page 173
Total pages 11
Place of publication Kidlington, Oxford United Kingdom
Publisher Pergamon Press
Collection year 2017
Language eng
Abstract Variations between fly ashes can lead to significant differences in the geopolymers derived from them, in both microstructural and mechanical properties. This study assesses the effect of physical, crystallographic and chemical characteristics of fly ash on geopolymerisation performance and the strength of the resulting binders. Physical and glass chemistry factors are combined to develop a comprehensive index to evaluate the suitability of fly ashes for the production of high-strength geopolymers. An equation for this index is proposed, developed using five typical low-calcium fly ashes and then validated against a further eight literature datasets, showing a good relationship between the ranking order of the calculated index and the compressive strengths of geopolymer pastes produced with comparable activator and paste workability. This index can be used to screen the source materials, which is of significant value in moving alkali activated cements towards acceptance in practice.
Keyword Alkali activated cement
Fly ash
X-ray diffraction
Compressive strength
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
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Centre for Microscopy and Microanalysis Publications
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