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Theses

Vers la prédiction des cinétiques de rééquilibrage entre 2 milieux initialement en conditions de saturation différentes

Abstract : Civil engineering structures are constantly subjected to desaturation/re-saturation processes depending on the surrounding conditions. This is particularly the case when it comes to concrete structures for the deep geological storage of radioactive waste. It is fundamental to understand the water transfer phenomena that occur during these water rebalancing phases to assess the sustainability of these structures. This thesis presents both an experimental and a numerical simulation study on the main mechanisms that are involved during the rebalancing process within cement-based materials. First, the experiments carried out make it possible to characterize the hydric behaviour of the materials through the acquisition of the main transfer parameters (porosity, sorption isotherms, permeability to liquid, vapour and gas). This will allow discussion of the relevance of different numerical and/or empirical approaches to their prediction in the case of cement-based materials. Then, the study focuses on the phenomena involved in a water rebalancing process between two samples, through various water transfer experiments (drying, soaking of steam and liquid water). A methodology based on non-destructive evaluation of materials is developed for the determination of moisture content profiles. A suitable approach is proposed for the modelling of moisture transfer mechanisms in cement-based materials, based on a porous network model for the prediction of transfer parameters developed by Ranaivomanana et al. A better prediction of these phenomena taken individually will provide the required information for the modelling of the global process.
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Submitted on : Monday, November 30, 2020 - 11:25:07 AM
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  • HAL Id : tel-03030742, version 1

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Mohamed Abdou Ibro. Vers la prédiction des cinétiques de rééquilibrage entre 2 milieux initialement en conditions de saturation différentes. Matériaux composites et construction. Université Paul Sabatier - Toulouse III, 2020. Français. ⟨NNT : 2020TOU30069⟩. ⟨tel-03030742⟩

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