Adu-Amankwah, S, Khatib, JM, Searle, DE et al. (1 more author) (2016) Effect of synthesis parameters on the performance of alkali-activated non-conformant EN 450 pulverised fuel ash. Construction and Building Materials, 121. pp. 453-459. ISSN 0950-0618
Abstract
The fly ash reported in this paper is coarser than conventional pulverised fuel ash (PFA), with loss on ignition (LOI) exceeding 10.8%. Consequently, it is precluded from being used as a supplementary cementitious material (SCM) according to EN 450 and disposed in landfills. Alkali-activation of such PFAs is considered here. Three concentrations of sodium hydroxide (NaOH) were separately blended with water glass at different ratios to modify the silica modulus. Heat of reaction, setting time, compressive strength and drying shrinkage were investigated as a function of activator composition. Specimens were either cured at room temperature or hydro-thermally treated at 75 °C for five hours. The results show that by optimizing the activator composition, a binder with a 28 day compressive strength of 25 MPa can be synthesised from such PFAs even at room temperature. Among the activator parameters, the alkali content was observed to be most influential.
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 published in Construction and Building Materials. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Geopolymer; fly ash; loss on ignition; shrinkage; setting time; EN 450 |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) > Institute for Resilient Infrastructure (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 24 May 2016 12:17 |
Last Modified: | 01 Jul 2017 19:29 |
Published Version: | http://dx.doi.org/10.1016/j.conbuildmat.2016.05.13... |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.conbuildmat.2016.05.132 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:100033 |