New approach in mathematical modelling of cement hydration development

Abstract

This paper describes development of a kinetic cement hydration model, which observes hydration rate relative to time dα/dt = f(T,t). The model established makes it possible to observe hydration rate relative to time and not relative to the reaction degree α, dα/dt = f(T,α), which offers a new approach to solving the cement hydration kinetics. The model assumes several simultaneous processes sequentially governing individual hydration segments. The model has been tested by means of experimental α-t data obtained from the DSC plots by quantifying the content of Ca(OH)2 from the cement-water system. The results indicate that the model established is valid and can be applied well.