Runci, A., Provis, J. orcid.org/0000-0003-3372-8922 and Serdar, M. (2022) Microstructure as a key parameter for understanding chloride ingress in alkali-activated mortars. Cement and Concrete Composites, 134. 104818. ISSN 0958-9465
Abstract
This study aims to evaluate the influence of microstructural properties on the chloride diffusion resistance of alkali-activated materials (AAMs) based on blast furnace slag and/or fly ash, with variable activator doses (represented as Na2O%). Resistance to chloride penetration was tested using accelerated chloride penetration (NT BUILD 443) and chloride migration (NT BUILD 492) tests. Addition of slag to alkali-activated mortars mainly based on fly ash reduced porosity and chloride permeability. Chloride penetration decreased with increasing Na2O%, but porosity and pore structure did not follow the same trend. The pore threshold (dth) and critical pore radius (rcrit) determined by mercury intrusion porosimetry had a good correlation with the chloride diffusion coefficient. Both the quantification of reaction products and the correlation between chloride penetration and pore surface area indicated that physical chloride adsorption on the C-A-S-H/N-A-S-H gel surfaces predominated over chemical chloride binding.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2022 The Authors. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). |
Keywords: | Alkali-activated materials; Chloride diffusion; Chloride migration; Microstructure; Porosity; Chloride binding capacity |
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) |
Funding Information: | Funder Grant number EUROPEAN COMMISSION - HORIZON 2020 813596 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 07 Dec 2022 15:30 |
Last Modified: | 07 Dec 2022 15:30 |
Status: | Published |
Publisher: | Elsevier BV |
Refereed: | Yes |
Identification Number: | 10.1016/j.cemconcomp.2022.104818 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:194190 |