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 Ca x H 6−2 x Si 2 O 7 · z Ca(OH) 2 · n H 2 O 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; K sp and free energies of formation for C‐S‐H's in this composition range are evaluated.
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Glasser et al. (1987) studied this question.
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