Kashani, A., Ngo, T.D., Walkley, B. orcid.org/0000-0003-1069-1362 et al. (1 more author) (2017) Thermal performance of calcium-rich alkali-activated materials: A microstructural and mechanical study. Construction and Building Materials, 153. pp. 225-237. ISSN 0950-0618
Abstract
The effects of Si/Al, Na/Al and water/solids ratios on thermal performance of alkali-activated materials (AAM) based on fly ash-slag blends are investigated. Higher Na/Al decreased compressive strength but increased post-heated strength retention and mass loss while reducing cracking at 1000 °C. Lower Si/Al resulted in lowest initial strength but highest thermal stability, with an increase in strength after exposure to 1000 °C, while a high degree of cracking was observed at higher Si/Al ratio. The effect of w/s on thermal performance was subtle. Computed tomography analysis showed for the first time thermally induced expansion of pores which reduced surface cracking via water vapour pressure release. Thermal performance of alkali-activated materials (AAM) is significantly better than Portland cement (PC) of the same compressive strength because of the very low bound water content. The porosity, pore connectivity and number of pores of the AAM were considerably higher than those in the PC binder.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2017 Elsevier. This is an author produced version of a paper subsequently published in JOURNAL. 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/) |
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: | 24 Aug 2017 13:18 |
Last Modified: | 18 Jul 2019 00:41 |
Published Version: | https://doi.org/10.1016/j.conbuildmat.2017.07.119 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.conbuildmat.2017.07.119 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:120425 |