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Approche multi-échelle des propriétés mécaniques et de transport des matériaux cimentaires soumis à des élévations de température

Abstract : The modern industrial activities (storage of nuclear waste, geothermal wells, nuclear power plants, ...) can submit cementitious materials to some extreme conditions, for example at temperatures above 200 ° C. This level of temperature will induce phenomena of dehydration in the cement paste, particularly impacting the CSH hydrates which led to the mechanical cohesion. The effects of these temperatures on the mechanical and transport propertes have been the subject of this thesis.To understand these effects, we need to take into account the heterogeneous, porous, multi-scale aspects of these materials. To do this, micromechanics and homogenization tools based on the Eshelby problem's solution were used. Moreover, to support this multi-scale modeling, mechanical testing based on the theory of porous media were conducted. The measurements of modulus compressibility, permeability and porosity under confining pressure were used to investigate the mechanisms of degradation of these materials during thermal loads up to 400 ° C
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Submitted on : Tuesday, September 11, 2012 - 11:37:35 AM
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Grégory Caratini. Approche multi-échelle des propriétés mécaniques et de transport des matériaux cimentaires soumis à des élévations de température. Matériaux. Université Paris-Est, 2012. Français. ⟨NNT : 2012PEST1023⟩. ⟨pastel-00730828⟩

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