Ke, X, Criado, M, Provis, JL et al. (1 more author) (2018) Slag-Based Cements That Resist Damage Induced by Carbon Dioxide. ACS Sustainable Chemistry & 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.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2018 American Chemical Society. This is an author produced version of a paper published in ACS Sustainable Chemistry & Engineering. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Alkali-activated cements; Calcium carbonate; Carbonation; Durability; Layered double hydroxides |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 11 Sep 2018 09:41 |
Last Modified: | 01 Mar 2019 01:39 |
Status: | Published |
Publisher: | American Chemical Society |
Identification Number: | 10.1021/acssuschemeng.7b04730 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:135502 |