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Issue 26, 2010
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Natural abundance high field 43Ca solid state NMR in cement science

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Abstract

This work is a systematic attempt to determine the possibilities and the limitations of the 43Ca high field solid state NMR in the study of cement-based materials. The low natural abundance (0.135%) and small gyromagnetic ratio of 43Ca present a serious challenge even in a high magnetic field. The NMR spectra of a number of cement compounds of known structure and composition are examined. The spectra of several phases important in cement science, e.g., anhydrous beta di-calcium silicate (β-C2S) and tri-calcium (C3S) silicate were obtained for the first time and the relation of spectroscopic and structural parameters is discussed. The method was also applied to the hydrated C3S and synthetic calcium silicate hydrates (C–S–H) of different composition in order to understand the state of calcium and transformations in the structure during hydrolysis. The spectra of hydrated C3S reveals a calcium environment similar to that of the C–S–H samples and 11 Å Tobermorite. These observations support the validity of using layered crystalline C–S–H systems as structural models for the C–S–H that forms in the hydration of Portland cement.

Graphical abstract: Natural abundance high field 43Ca solid state NMR in cement science

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Publication details

The article was received on 07 Jan 2010, accepted on 11 Mar 2010 and first published on 12 May 2010


Article type: Paper
DOI: 10.1039/C000353K
Citation: Phys. Chem. Chem. Phys., 2010,12, 6961-6969
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    Natural abundance high field 43Ca solid state NMR in cement science

    I. L. Moudrakovski, R. Alizadeh and J. J. Beaudoin, Phys. Chem. Chem. Phys., 2010, 12, 6961
    DOI: 10.1039/C000353K

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