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Etude de l'évolution de la perméabilité du béton en fonction de son endommagement : transposition des résultats de laboratoire à la prédiction des débits de fuite sur site

Abstract : The building reactor of the nuclear power plants are designed to provide precise containment and sealing properties in normal use situations and in the event of a nuclear accident, to prevent the spread of radioelements in the environment. Since these enclosures are made of concrete, controlling the evaluation of the permeability of concrete and its evolutions under stress would make it possible to evaluate the leakage rates that may occur over time under certain conditions. Until today, there are several techniques for measuring permeability and these techniques lead to different results for the same concrete specimen. The first study we carried out was therefore to propose a standardization of the permeability measurement: this standardization resulted in the determination of a characteristic permeability of concrete and independent of the measurement technique. In parallel with this approach, we also proposed to evaluate the permeability of concrete using observables from Non-Destructive Testing such as permittivity and electrical resistivity. The results obtained show the possibility of estimating the permeability under concrete conditions on site. The second study carried out relates to the control of the permeability under constraints. In the laboratory, we investigated the permeability of concrete specimens of different sizes under various conditions of drying, thermal stress, mechanical and coupled damage. We could establish permeability-damage models according to each source of damage. The third study carried out relates to the transposition from laboratory results to the site, using nuclear power plants mock-up of larger dimensions and representative of the actual structure (VeRCoRs at scale 1/3). All the results of the first two studies have been used and have led to calculations of leak rates and Time to Reach Steady State (TRSS) consistent with the calculation assumptions.
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https://tel.archives-ouvertes.fr/tel-01919100
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Submitted on : Monday, November 12, 2018 - 11:13:07 AM
Last modification on : Saturday, August 15, 2020 - 3:54:16 AM
Long-term archiving on: : Wednesday, February 13, 2019 - 2:11:08 PM

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2017TOU30210b.pdf
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  • HAL Id : tel-01919100, version 1

Citation

Hognon Eric Arnaud Sogbossi. Etude de l'évolution de la perméabilité du béton en fonction de son endommagement : transposition des résultats de laboratoire à la prédiction des débits de fuite sur site. Matériaux composites et construction. Université Paul Sabatier - Toulouse III, 2017. Français. ⟨NNT : 2017TOU30210⟩. ⟨tel-01919100⟩

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