Abstract
Silicon-29 nuclear magnetic resonance has been used to probe the effects of temperature and the addition of reactive silica on the silicate structure of amorphous calcium silicate hydrate (C-S-H), produced by the hydration of alite (Ca3SiO5). Both an increase in the temperature of formation and the addition of reactive silica increase the degree of silicate polymerization in the C-S-H. However, in all cases the data are consistent with the formation of linear chain silicates and the absence of any cross-linking. The initial formation of a hydrated orthosilicate is observed, and it is suggested that this species may form during the adsorption of water onto the surface of alite during storage.
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