One-Dimensional-Time Study of the Dehydration of Plasterboards Under Standard Fire Condition (ISO 834): Thermo-Chemical Analysis
Résumé
Gypsum materials are often used as a technical solution for passive fire protection in many civil engineering applications. In this study, the dehydration of plasterboard with large thickness, 40 mm, is studied using a one-dimensional (along the thickness) and time methodology analysis. Such materials are subjected on one side to a standard fire curve (ISO 834). The imposed heat transfer directly to the exposed face of the board induces combined actions due to the gypsum dehydration. The thermal barrier efficiency evolves significantly versus time. The local measurement of the temperature field through the sample and the local water content combined with the analysis of the local chemical structure helped us to model and analyze the dehydration processes.