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- W2079005175 abstract "Nano-crystalline calcium silicate hydrates (C-S-H gels) are formed upon hydration of Ca3SiO5 and β-Ca2SiO4, and are therefore the primary hydration products of Portland cements. Raman and IR spectra of a series of mechanochemically prepared C-S-H samples of type C-S-H(1) with Ca/Si ratios ranging from 0.4 to 1.5 reveal changes in structure dependent upon Ca/Si ratio. Finite silicate chains (Q) dominate the structures of the samples at Ca/Si ratios 0.4-1.0, the spectra showing characteristic symmetrical stretching bands between 1010 and 1020cm (R) and asymmetrical stretching around 965cm (IR), with Q units present at Ca/Si 1.00, dimers (Q) are the main building unit of the silicate anionic structure (Raman bands at 890cm, IR band at 945cm). In these samples portlandite is also observed. The similarity of the silicate contribution to the spectra (R and IR) of the samples with Ca/Si = 1.33 and 1.50, and their differing portlandite contents, suggests a similar limit of incorporation of Ca into the C-S-H(I) structure in both phases, which lies under Ca/Si=1.33. In these phases we observe increased ordering of Ca-bonded OH groups. The same trend of increased ordering of the Ca environment is also seen in the development of the intensity and FWHM of the Ca-O band at 332cm (R), 255cm (IR) which is consistent with observations in the Ca2p XPS spectra [2]." @default.
- W2079005175 created "2016-06-24" @default.
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- W2079005175 date "2006-08-06" @default.
- W2079005175 modified "2023-09-26" @default.
- W2079005175 title "Radiospectroscopy of vein quartz of the subpolar ural deposits" @default.
- W2079005175 doi "https://doi.org/10.1107/s0108767306095845" @default.
- W2079005175 hasPublicationYear "2006" @default.
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