Ke, X, Bernal, SA orcid.org/0000-0002-9647-3106 and Provis, JL (2019) Layered Double Hydroxides Modify the Reaction of Sodium Silicate-Activated Slag Cements. Green Materials, 7 (2). pp. 52-60. ISSN 2049-1220
Abstract
The impact of adding two types of layered double hydroxides (LDHs), commercial hydrotalcite (HT) and its thermally treated form (CLDH), on the reaction kinetics and phase assemblage development of a sodium silicate-activated slag cement was investigated. The reaction kinetics of LDH-modified cements was assessed by isothermal calorimetry, and the results were correlated with in situ attenuated total reflection Fourier transform infrared spectroscopy results collected over the first days of reaction, to identify the structural evolution of the main binding phase forming in these cements: a sodium-containing calcium aluminosilicate hydrate (C-(N)-A-S-H)-type gel. The addition of either HT or CLDH into sodium silicate-activated slag paste accelerates the precipitation of reaction products and increases the formation of HT in these cements, without causing significant changes to the C-(N)-A-S-H binding phase. This is extremely relevant in terms of the durability of alkali-activated slag cements, as a higher content of the HT-like phase has the potential to reduce their chloride permeability and enhance carbonation resistance.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | This article is protected by copyright. Published with permission by the ICE under the CC-BY 4.0 license. (http://creativecommons.org/licenses/by/4.0/) |
Keywords: | green chemistry material characterisation scanning electron microscopy |
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) |
Depositing User: | Symplectic Publications |
Date Deposited: | 17 Jul 2019 13:04 |
Last Modified: | 17 Jul 2019 13:04 |
Status: | Published |
Publisher: | ICE Publishing |
Identification Number: | 10.1680/jgrma.18.00024 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:148639 |