Séchage des bétons réfractaires : expérimentation, modélisation et influence d'un ajout de fibres polymère

Abstract : Castable refractories take a more and more important place in various industries: cement factory, casting, iron and steel making. They consist mainly of aggregates of high-alumina and ultra-low cement. Their permeability is very low and they contain before the first heat-up a residual water content of 4 to 6 % (dry basis). Drying during the first heat-up is a crucial step which sharply influence the refractory in-service performances. On one hand, damaging can occur, and as a consequence will reduce drastically the life time of the plants. On the other hand, particular drying conditions can lead to an explosive spalling of the refractory corresponding to an internal gas pressure steep raise linked to the water saturated vapour pressure raise with temperature. First, a complete thermomechanical characterization between ambient temperature and 500 °C of the unshaped refractory materials has been conducted. Then the mechanisms involved during their drying, on one hand, by an experiment and, on the other hand, by using a simultaneous heat and mass transfer model in porous media have been studied. And last, the impact of adding polymer fibers has been analysed both on the concrete permeability as well as their influence on drying
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Brice Collignon. Séchage des bétons réfractaires : expérimentation, modélisation et influence d'un ajout de fibres polymère. Autre. Institut National Polytechnique de Lorraine, 2009. Français. ⟨NNT : 2009INPL051N⟩. ⟨tel-01748725⟩

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