Structural features of C-S-H(I) and its carbonation in air - A Raman spectroscopic study. Part I: Fresh phases

GARBEV, K., STEMMERMANN, P., BLACK, L., BREEN, C., YARWOOD, J. and GASHAROVA, B. (2007). Structural features of C-S-H(I) and its carbonation in air - A Raman spectroscopic study. Part I: Fresh phases. Journal of the American Ceramic Society, 90 (3), 900-907.

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The Raman spectra of a series of mechanochemically prepared calcium silicate hydrate samples of type C-S-H(I) with C/S ratios ranging from 0.2 to 1.5 reveal changes in structure with changes in the C/S ratio. These support the model of Stade and Wieker based entirely on the tobermorite structure. The main characteristic feature of the spectra is the Si-O-Si bending vibration at about 670 cm(-1). Comparisons with bending frequencies of some known crystalline phases composed of single silicate chains led to an estimation of the mean Si-O-Si angles in the C-S-H(I) phases to be similar to 140 degrees. Finite silicate chains (Q(2)) dominate the structures of the samples at C/S ratios 0.2-1.0, the spectra showing characteristic bands from 1010 to 1020 cm(-1). When the samples are measured in air, the spectra exhibit carbonate bands arising from surface carbonation. The nu(1)[CO3] bands obscure the characteristic Raman scattering of silicate units near 1080 cm(-1), which is clearly evident in the fresh samples analyzed in closed capillaries. At C/S > 1.00, dimers (Q(1)) are the main building unit of the silicate anionic structure, with a characteristic band at 889 cm(-1). At C/S ratios 1.33 and 1.50, portlandite (Ca(OH)(2)) is also observed.

Item Type: Article
Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Advanced Coatings and Composites Research Centre > Polymers, Composites and Spectroscopy Group
Identification Number:
Page Range: 900-907
Depositing User: Jill Hazard
Date Deposited: 13 May 2010 09:08
Last Modified: 18 Mar 2021 21:15

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