Selective isotopic enrichment of SiO 2 with 29 Si in a mixture with tricalcium silicate (C 3 S) 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 Q 2 signal has been observed in 29 SI solid‐state MAS NMR spectroscopy of C‐S‐H gels of relatively low Ca/Si ratio, prepared by hydration or by carbonation of a C 3 S 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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Brough et al. (1994) studied this question.
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