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

Colan E Hughes¹, Brant Walkley², Laura J Gardner², Samuel A Walling², Susan A Bernal³, Dinu Iuga⁴, John L Provis⁵, Kenneth D M Harris⁶

Affiliations

¹ School of Chemistry, Cardiff University, Park Place, Cardiff, Wales, CF10 3AT, UK.
² Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield, S1 3JD, UK.
³ Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield, S1 3JD, UK; School of Civil Engineering, University of Leeds, Leeds, LS2 9JT, UK.
⁴ Department of Physics, University of Warwick, Coventry, CV4 7AL, UK.
⁵ Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield, S1 3JD, UK. Electronic address: j.provis@sheffield.ac.uk.
⁶ School of Chemistry, Cardiff University, Park Place, Cardiff, Wales, CF10 3AT, UK. Electronic address: HarrisKDM@cardiff.ac.uk.

PMID: 30772677
DOI: 10.1016/j.ssnmr.2019.01.003

Free article

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

Colan E Hughes et al. Solid State Nucl Magn Reson. 2019 Jul.

Free article

. 2019 Jul:99:1-6.

doi: 10.1016/j.ssnmr.2019.01.003. Epub 2019 Jan 14.

Authors

Colan E Hughes¹, Brant Walkley², Laura J Gardner², Samuel A Walling², Susan A Bernal³, Dinu Iuga⁴, John L Provis⁵, Kenneth D M Harris⁶

Affiliations

¹ School of Chemistry, Cardiff University, Park Place, Cardiff, Wales, CF10 3AT, UK.
² Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield, S1 3JD, UK.
³ Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield, S1 3JD, UK; School of Civil Engineering, University of Leeds, Leeds, LS2 9JT, UK.
⁴ Department of Physics, University of Warwick, Coventry, CV4 7AL, UK.
⁵ Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield, S1 3JD, UK. Electronic address: j.provis@sheffield.ac.uk.
⁶ School of Chemistry, Cardiff University, Park Place, Cardiff, Wales, CF10 3AT, UK. Electronic address: HarrisKDM@cardiff.ac.uk.

PMID: 30772677
DOI: 10.1016/j.ssnmr.2019.01.003

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.

Keywords: (27)Al NMR; CLASSIC NMR; Calcium aluminate; Cement formation; In-situ solid-state NMR.

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

Affiliations

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

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Abstract

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Grants and funding

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