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

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Journal titlePhysical Chemistry Chemical Physics
Pages69616969; # of pages: 9
Subject43Ca NMR, cement-based materials, C-S-H, cement compounds; Cement/Concrete
AbstractThis work is a systematic attempt to determine the possibilities and the limitations of the 43Ca highfield 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. TheNMR spectra of a number of cement compounds of known structure and composition areexamined. The spectra of several phases important in cement science, e.g., anhydrous betadi-calcium silicate (b-C2S) and tri-calcium (C3S) silicate were obtained for the first time and therelation of spectroscopic and structural parameters is discussed. The method was also applied to thehydrated C3S and synthetic calcium silicate hydrates (C?S?H) of different composition in order tounderstand the state of calcium and transformations in the structure during hydrolysis. The spectraof hydrated C3S reveals a calcium environment similar to that of the C?S?H samples and 11 A °Tobermorite. These observations support the validity of using layered crystalline C?S?H systems asstructural models for the C?S?H that forms in the hydration of Portland cement.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number53542
NPARC number20374999
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Record identifier63688114-06a8-4a87-853b-0303dcb27d4c
Record created2012-07-23
Record modified2016-05-09
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