DETERMINATION OF THE END OF HYDRATION OF GYPSUM PLASTERS USING TEMPERATURE-TIME CURVES AT ROOM-TEMPERATURE

Based on theoretical considerations of the temperature-time behaviour of hydrating hemihydrate binders and their description by mathematical equations it is demonstrated that the end of hydration can be determi ned exactly even under non-adiabatic conditions. For this purpose the temperature-time curve is treated differently for heating and for cool ing. The cooling is calculated by Newton's law of cooling while the he ating functions are described by the e-function.