Hughes, Colan E., Walkley, Brant, Gardner, Laura J., Walling, Samuel A., Bernal, Susan A., Iuga, Dinu, Provis, John L. and Harris, Kenneth D.M. ORCID: https://orcid.org/0000-0001-7855-8598 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 , -. 10.1016/j.ssnmr.2019.01.003 |
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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.
Item Type: | Article |
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Date Type: | Publication |
Status: | Published |
Schools: | Chemistry Advanced Research Computing @ Cardiff (ARCCA) |
Publisher: | Elsevier |
ISSN: | 0926-2040 |
Date of First Compliant Deposit: | 22 January 2019 |
Date of Acceptance: | 11 January 2019 |
Last Modified: | 04 May 2023 23:08 |
URI: | https://orca.cardiff.ac.uk/id/eprint/118608 |
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