Hughes, CE orcid.org/0000-0003-2374-2763, Walkley, B orcid.org/0000-0003-1069-1362, Gardner, LJ orcid.org/0000-0003-3126-2583 et al. (5 more authors) (2019) Exploiting in-situ solid-state NMR spectroscopy to probe the early stages of hydration of calcium aluminate cement. Solid State Nuclear Magnetic Resonance, 99. pp. 1-6. ISSN 0926-2040
Abstract
We report a high-field in-situ solid-state NMR study of the hydration of CaAl2O4 (the most important hydraulic phase in calcium aluminate cement), based on time-resolved measurements of solid-state 27Al NMR spectra during the early stages of the reaction. A variant of the CLASSIC NMR methodology, involving alternate recording of direct-excitation and MQMAS 27Al NMR spectra, was used to monitor the 27Al species present in both the solid and liquid phases as a function of time. Our results provide quantitative information on the changes in the relative amounts of 27Al sites with tetrahedral coordination (the anhydrous reactant phase) and octahedral coordination (the hydrated product phases) as a function of time, and reveal significantly different kinetic and mechanistic behaviour of the hydration reaction at the different temperatures (20 °C and 60 °C) studied.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
Keywords: | In-situ solid-state NMR; 27Al NMR; Calcium aluminate; CLASSIC NMR; Cement formation |
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) |
Funding Information: | Funder Grant number EPSRC EP/R001642/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 20 Feb 2019 09:22 |
Last Modified: | 17 Dec 2024 12:16 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.ssnmr.2019.01.003 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:142686 |