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Coupling between corrosion and biphasic transport in porous media: Application to the evolution of radioactive wastes disposal

Wissem Dridi
Abstract : In the actual concepts of geological disposal, high level radioactive wastes are packed in metallic containers surrounded by a partially or totally saturated clay media. In contact with the interstitial water, anoxic corrosion of this container will start producing hydrogen. In the scope of safety assessment, the present study deals with two main topics: prediction of the long-term corrosion of carbon steel with respect to clay water content and evaluation of the risk of damage of the clay barrier related to gas production. Elementary processes controlling the kinetics of corrosion are limited to oxide growth and mass transfer through the porosity of this film. Thanks to a macroscopic description of theses processes, followed by an interfacial kinetic law, a mechanistic modeling of the anoxic corrosion in partially saturated porous media is proposed. This approach is validated when confronted to the long-term corrosion tests performed in saturated clay. Both modeling and laboratory experiments have confirmed that kinetics of anoxic corrosion in partially saturated clay is mainly controlled by the surrounding relative humidity as in the case of aerated or atmospheric corrosion. In the gas generation topic, some numerical simulations are performed concerning the oedometric and triaxial test dealing with gas migration in saturated clay. Finally, long-term calculations are conducted concerning hydromechanical impact of corrosion in deep geological repositories. Due to a more realistic prediction of the long-term corrosion, the risks of gas overpressures, local desaturation and mechanical damage are reduced.
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https://pastel.archives-ouvertes.fr/pastel-00001422
Contributor : Ecole Des Ponts Paristech <>
Submitted on : Monday, October 3, 2005 - 8:00:00 AM
Last modification on : Tuesday, October 20, 2020 - 10:20:06 AM
Long-term archiving on: : Thursday, September 30, 2010 - 6:46:23 PM

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  • HAL Id : pastel-00001422, version 1

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Wissem Dridi. Coupling between corrosion and biphasic transport in porous media: Application to the evolution of radioactive wastes disposal. Engineering Sciences [physics]. Ecole des Ponts ParisTech, 2005. English. ⟨pastel-00001422⟩

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