Application of Selective 29Si Isotopic Enrichment to Studies of the Structure of Calcium Silicate Hydrate (C-S-H) Gels |
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| Authors: | Adrian R Brough Christopher M Dobson Ian G Richardson Geoffrey W Groves |
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| Affiliation: | Inorganic Chemistry Laboratory, University of Oxford, Oxford OX1 3QR, United Kingdom;Department of Materials, University of Oxford, Oxford OX13 PH, United Kingdom |
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| Abstract: | Selective isotopic enrichment of SiO2 with 29Si in a mixture with tricalcium silicate (C3S) has allowed the Si from this phase to be effectively labeled during the course of the hydration reaction, thus isolating its contribution to the reaction. A double Q2 signal has been observed in 29SI solid-state MAS NMR spectroscopy of C-S-H gels of relatively low Ca/Si ratio, prepared by hydration or by carbonation of a C3S paste. The origin of the weaker, downfield peak is discussed and tentatively attributed to bridging tetrahedra of a dreierkette silicate chain structure. |
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