Compréhension des mécanismes de séchage dans les matériaux de construction : cas du plâtre

Abstract : Issues related to sustainability encourage more building material industries to engage policies in making processes energy consumption reduction. This study is conducted in this purpose, and is focused on the case of plasterboard. Indeed for plasterboard manufacturing, gypsum from quarry are first calcined to get hemihydrate, which is then mixed with water to make again gypsum we find in plasterboard. However, to get a good workability during the preparation process, it is necessary to add an excess amount of water relative to that required by the stoichiometry of the hydration reaction. This excess water should be evacuated thereafter drying. Thus, the manufacture of gypsum proved to be very energy intensive : that is the cornerstone of this thesis, during which we will try to understand the physics that govern the drying of plaster in order to reduce its energy consumption. To conduct this study, we are primarily interested in understanding of simple porous media drying (stack of glass beads, capillary tubes). Then based on our understanding of the physical mechanisms that govern their drying, on one hand, and on local observations (NMR, MRI, microtomography), on the other hand, we give an explanation to the different physical mechanisms of plaster drying. This allows us to establish a physical model to predict the drying kinetics of plaster - model that can be used for energy optimization approach during the manufacturing process of plasterboard. Its can also be used for the drying kinetics prediction of other building materials
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Mamadou Diaga Seck. Compréhension des mécanismes de séchage dans les matériaux de construction : cas du plâtre. Matériaux. Université Paris-Est, 2015. Français. ⟨NNT : 2015PESC1154⟩. ⟨tel-01366136⟩

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