Durabilité et comportement hygroscopique du Douglas en relation avec son patrimoine génétique

Abstract : For exterior civil engineering works, durability issues are mainly linked to the risks of biological attacks tempered by environmental moisture conditions. Douglas fir, which is naturally sustainable in risk class 3, requires complex treatments when it is exposed to severe moisture condition, a treatment which have significant environmental impacts that remains marked even today. In the context of the Chair, 'Resources Forestières & Usages du Bois' created by the University of Limoges and in partnership with the INRA of Orléans, the PIAF and the Pascal Institute of Clermont Ferrand, we present an original approach whose objective is to increase this degree of natural durability, and to limit the systematic use of preservation treatments. This approach to durability proposes a coupling between the genetic heritage of different Douglas families and the structural durability by using, as a 'marker', the hygroscopic behavior of the material. The aim of this work is to characterize the hygroscopic properties of four Douglas genotypes, and more precisely, the properties of water diffusion and sorption isotherms. This statistical study feeds a database with the objective is to isolate a genotype in relation with limiting hydric-inertia characteristics, both the water peaks and the penetration of the water front in the structural massive elements.
Keywords : Genetic heritage
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Theses
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Amine Jamaaoui. Durabilité et comportement hygroscopique du Douglas en relation avec son patrimoine génétique. Génie civil. Université de Limoges, 2017. Français. ⟨NNT : 2017LIMO0068⟩. ⟨tel-01687811⟩

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