Toward an indexing approach to evaluate fly ashes for geopolymer manufacture

Zhang, Zuhua and Provis, John L. and Zou, Jin and Reid, Andrew and Wang, Hao (2016) Toward an indexing approach to evaluate fly ashes for geopolymer manufacture. Cement and Concrete Research, 85. pp. 163-173. ISSN 0008-8846

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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version, in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Date Deposited: 08 Mar 2017 00:27
Last Modified: 23 Jan 2018 06:11
Uncontrolled Keywords: alkali activated cement, fly ash, x-ray diffraction, compressive strength
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090502 Construction Engineering
09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
Identification Number or DOI: 10.1016/j.cemconres.2016.04.007
URI: http://eprints.usq.edu.au/id/eprint/30831

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