Shearer, C.R., Provis, J.L. orcid.org/0000-0003-3372-8922, Bernal, S.A. et al. (1 more author) (2016) Alkali-activation potential of biomass-coal co-fired fly ash. Cement and Concrete Composites, 73. pp. 62-74. ISSN 0958-9465
Abstract
Co-fired fly ash, derived from the co-combustion of coal and biomass, is examined as a potential precursor for geopolymers. Compared to a coal fly ash, two co-fired fly ashes have a lower vitreous content and higher carbon content, primarily due to differing combustion processing variables. As a result, binders produced with these co-fired fly ashes have reduced reaction potential. Nevertheless, compressive strengths are generally highest for all ashes activated with solutions with a molar ratio of SiO2/(Na2O + K2O) = 1, and these mixes reach the highest extent of reaction among those studied. Activation with sodium hydroxide solution forms zeolitic phases for all ashes. The thermal and dilatometric behavior of the coal and co-fired fly ash geopolymers is similar between equivalent mix designs. These results indicate that co-fired fly ashes can be viably used to form alkali-activated geopolymers, which is a new beneficial end-use for these emerging waste materials.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 Elsevier. This is an author produced version of a paper subsequently published in Cement and Concrete Composites. 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: | Fly ash; Biomass; Geopolymer; Strength; Characterization; Microscopy |
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: | 01 Aug 2016 12:58 |
Last Modified: | 18 Jul 2017 16:40 |
Published Version: | http://dx.doi.org/10.1016/j.cemconcomp.2016.06.014 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.cemconcomp.2016.06.014 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:103109 |
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