Bernal, S.A., Rodríguez, E.D., Mejía de Gutiérrez, R. et al. (1 more author) (2012) Performance of alkali-activated slag mortars exposed to acids. Journal of Sustainable Cement-based Materials, 1 (3). 138 - 151. ISSN 2165-0373
Abstract
The acid resistance of 60-day cured alkali-activated slag (AAS) mortars, in comparison with Portland cement, is assessed. Specimens are exposed to hydrochloric, nitric and sulphuric acids at pH 3.0, and acetic acid (CH3COOH) at pH 4.5, for 150 days, with specimens also immersed in water as a control. Negligible changes in compressive strength are identified in Portland cement and AAS binders during exposure to mineral acids, while compressive strength increases during immersion in water. However, exposure to CH3COOH reduces strength, and increases pore volume, in both Portland cement and AAS mortars. AAS performs better than Portland cement in CH3COOH, associated with the lower initial permeability of the specimens, along with the low CaO/SiO2 ratio typical of AAS. Decalcification of the AAS binder through formation of calcium acetate leaves an aluminosilicate type gel that can hinder the further ingress of acids, contributing to the high acid resistance of this binder.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2012 Taylor & Francis. This is an author produced version of a paper subsequently published in Journal of Sustainable Cement-Based Materials. Uploaded in accordance with the publisher's self-archiving policy. This is an Accepted Manuscript of an article published by Taylor & Francis in Journal of Sustainable Cement-Based Materials on 27 November 2012, available online: http://wwww.tandfonline.com/10.1080/21650373.2012.747235. |
Keywords: | alkali-activated slag; acid attack; compressive strength; porosity; chemical degradation |
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: | 12 Oct 2015 14:13 |
Last Modified: | 24 Oct 2015 10:04 |
Published Version: | https://doi.org/10.1080/21650373.2012.747235 |
Status: | Published |
Publisher: | Taylor & Francis |
Refereed: | Yes |
Identification Number: | 10.1080/21650373.2012.747235 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:86422 |