Preparations that have Ca/Si greater than about 1.4 include an intermixed Ca-rich phase. It is shown that there are no interlayer calcium ions when the silicate chains are of infinite length and that one is added for each tetrahedral ‘bridging’ site that is vacant. 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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