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Modélisation poromécanique du gonflement d'enrobés bitumineux par reprise d'eau

Abstract : The main objective of this thesis is the development of a numerical model to reproduce the behaviour of simplified Bituminized Waste Products (BWP) during a leaching test. BWP is composed of salt crystals immobilised in a bitumen matrix. BWP were mainly produced during industrial reprocessing of spent fuel, and are classified as low or intermediate activity long lived radioactive waste. Geological disposal is the reference solution for intermediate level long-lived BWP. Under geological disposal conditions, and after a long period of time, BWP will undergo water re-saturation from the host rock. Dissolution of salt crystals and osmotic process could lead to swelling of the bitumen matrix and water uptake.A poromechanical numerical model has been implemented in a finite element software to model BWP behaviour under such conditions. The constitutive model takes into account the impact of dissolution, permeation, diffusion and osmosis. A viscoelastic constitutive law is also used. This model is calibrated with experimental data on French simplified BWP containing a highly soluble salt. Evolution of the amount of water absorbed and salt leached by the sample during the test and swelling are carefully studied. The dependency of material parameters with porosity variation is also examined. Some homogenization method are used for mechanical parameters.
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Submitted on : Wednesday, August 19, 2020 - 12:03:09 PM
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Geoffroy Mélot. Modélisation poromécanique du gonflement d'enrobés bitumineux par reprise d'eau. Mécanique des matériaux [physics.class-ph]. Université Paris-Est, 2019. Français. ⟨NNT : 2019PESC1041⟩. ⟨tel-02917456⟩

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