Zhang, Z., Provis, J.L. orcid.org/0000-0003-3372-8922, Zou, J. et al. (2 more authors) (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.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 Elsevier Ltd. This is an author produced version of a paper subsequently published in Cement and Concrete Research. Uploaded in accordance with the publisher's self-archiving policy. Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/) |
Keywords: | Alkali activated cement; Fly ash; X-ray diffraction; Compressive strength |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 26 May 2016 15:33 |
Last Modified: | 18 Jul 2017 18:14 |
Published Version: | http://dx.doi.org/10.1016/j.cemconres.2016.04.007 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.cemconres.2016.04.007 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:100032 |
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Filename: Reactivity index of fly ash for geopolymer manufacture-R1-clean version WRRO.pdf
Licence: CC-BY-NC-ND 4.0