New structural–chemical formulae are presented for single- and double-chain tobermorite-based phases and equations are provided that can be used to calculate a number of useful quantities from 29Si NMR data. It is a structurally imperfect form of 14 Å tobermorite that has variable composition and length of (alumino)silicate anions. C-(A)-S-H(I) is a calcium silicate hydrate that is studied extensively as a model for the main binding phase in concrete.
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