Modélisation du comportement thermique haute température de matériaux minéraux

ABSTRACT High temperature thermal transfer in hydrated minerals (such as gypsum, cement…) is studied and modelled. Exposed to fire, the studied materials are subject to phases transitions correlated with a high dehydration latent heat. The development of an electric furnace allowing the realisation of unidirectional high thermal transfer. The results of these trials are collected and merge in a database of experimental results. Concurrently, a thermal transfer model is built. Thermal analyses such as DTA/TG are used to determine the degradation kinetics of hydrated minerals. The degradation kinetics is modelled with a classical solid state kinetic law based on the chemical reaction rate. This law is used to balance the dehydration latent heat introduced in the heat equation. The developed model is then based on an implicit scheme and uses the finite difference method. Modelled and experimental results are presented herein.