Alite dissolution and C-S-H precipitation rates during hydration

Application of thermodynamic modelling to hydrated cements

“…The kinetics of dissolution and precipitation reactions during cement hydration depends to a large extent on the degree of over-or undersaturation of the respective solids, although it is also influenced by the presence of other ions. Alite dissolution is fast at high degrees of undersaturation and slow at near equilibrium conditions [145][146][147][148]; the interplay of undersaturation with respect to C3S and oversaturation with respect to C-S-H is a major factor determining hydration kinetics of alite [124,[149][150][151][152]. Nucleation processes play an important role for the reaction kinetics; any factor, such as e.g.…”

Hydration of C3S in presence of CA: Mineral‐pore solution interaction

“…The delayed silicate reaction starts after the concentration of Al has reached a value of 0.01‐0.02 mmol/L and the measured Ca concentration is in the range of ~38 mmol/L. This is comparable to the concentration which is reached at the start of the main reaction in a neat C 3 S hydration . A possible explanation for the observed phase development and measured concentrations could be the role of the Ca/Al ratio in the pore solution.…”

Effect of Portland Cement versus Sulphoaluminate Cement on the Properties of Blended Lime-Based Mortars Prepared by Carbide Slag

“…The hydration product of sulphoaluminate cement is mainly AFt, which contains 32 crystal-waters. However, the main hydration product formed in Portland cement hydration is calcium silicate hydrate (C-S-H) with much less crystal water than AFt [48,49].…”