Abstract
A compositional model based on available structural evidence is proposed for amorphous calcium silicate hydrogel. It is applicable to gels in the (Ca/Si),solid range 1.0 to 1.4 and is formulated to take account of dimeric silicate species in the solid. Its composition is represented by CaxH6−2xSi2O7·zCa(OH)2·nH2O where x and z are not independently obtainable; x+z, however, is evaluated from the Ca/Si ratio. The model is applied to representative solubility data; Ksp and free energies of formation for C‐S‐H's in this composition range are evaluated.
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