Ke, X. orcid.org/0000-0002-1239-6861, Criado, M. orcid.org/0000-0002-1027-6233, Provis, J.L. orcid.org/0000-0003-3372-8922 et al. (1 more author) (2018) Slag-Based Cements That Resist Damage Induced by Carbon Dioxide. ACS Sustainable Chemistry and Engineering, 6 (4). pp. 5067-5075. ISSN 2168-0485
Abstract
The use of sodium carbonate as an activator to prepare alkali-activated cements from blast furnace slag and calcined hydrotalcite offers many attractive performance and environmental benefits. However, the understanding of the long-term performance of these cements is limited. In this study, the resistance of sodium carbonate-activated slag cements to carbonation attack was determined under natural (0.04%) and elevated (1.0%) CO2 concentrations. Two calcium carbonate polymorphs, calcite and vaterite, were formed as carbonation products at a longer time of CO2 exposure. A cross-linked alkali aluminosilicate gel and a Ca-deficient calcium (alumino)silicate hydrate gel were identified to form by decalcification of the main binding phases initially present in these cements. However, despite these carbonation-induced mineralogical changes, the mechanical strength after carbonation was comparable to that of noncarbonated specimens, which is contrary to previous observations of strength loss due to carbonation of slag-rich cements. The high carbonation resistance of sodium carbonate-activated slag cement indicates these materials have the potential to resist attack by atmospheric CO2 in service with sustained mechanical performance.
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Copyright, Publisher and Additional Information: | This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Sustainable Chemistry and Engineering, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acssuschemeng.7b04730 | ||||
Keywords: | Alkali-activated cements; Carbonation; Calcium carbonate; Durability; Layered double hydroxides | ||||
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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) | ||||
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Depositing User: | Symplectic Sheffield | ||||
Date Deposited: | 31 May 2018 10:51 | ||||
Last Modified: | 01 Mar 2019 01:38 | ||||
Published Version: | https://doi.org/10.1021/acssuschemeng.7b04730 | ||||
Status: | Published | ||||
Publisher: | American Chemical Society | ||||
Refereed: | Yes | ||||
Identification Number: | https://doi.org/10.1021/acssuschemeng.7b04730 | ||||
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