Thermodynamic analysis of the C-S-H system

A series of experimental investigations has been conducted on the calcium silicate hydrate system at various C/S molar ratios (0·83–1·2), temperatures (175°C–190°C) and soaking times (4–12 h). The products of hydration were compared with the results predicted by an equilibrium calculation. For this purpose, a modification of classical thermodynamic technique was introduced, based on the compositional model of the initial state of the system. Measured and calculated values agreed well.