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Exploiting in-situ solid-state NMR spectroscopy to probe the early stages of hydration of calcium aluminate cement

Hughes, Colan E., Walkley, Brant, Gardner, Laura J., Walling, Samuel A., Bernal, Susan A., Iuga, Dinu, Provis, John L. and Harris, Kenneth D.M. 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
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: 15 Aug 2019 14:30
URI: http://orca.cf.ac.uk/id/eprint/118608

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