Simulation of the degradation of a concrete/clay interface:influence of temperature, unsaturated conditions and porosityvariations

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For long-lived intermediate-level radioactive waste, the useof concrete as engineering barrier and Callovian-Oxfordian clay asgeological barrier at a depth of 500 m is considered in the Frenchdisposal concept (ANDRA, 2005). Upon emplacement, initially unsaturatedconcrete is expected to experience coupled processes involving heating,re-saturation with groundwater from the clay formation, gas exchanges andgeochemical reactions. After an early period of re-saturation, solutetransport is supposed to be diffusion-controlled because of the extremelylow permeability of the two media. These coupled processes may lead tochanges in the porosity of the concrete or clay barriers. In the presentpaper, a fully coupled Thermo-Hydro-Chemical (THC) response of atwo-phase (gas ... continued below

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Burnol, A.; Dupros, F.; Spycher, N.; Xu, T. & Gaucher, E.C. July 1, 2006.

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Description

For long-lived intermediate-level radioactive waste, the useof concrete as engineering barrier and Callovian-Oxfordian clay asgeological barrier at a depth of 500 m is considered in the Frenchdisposal concept (ANDRA, 2005). Upon emplacement, initially unsaturatedconcrete is expected to experience coupled processes involving heating,re-saturation with groundwater from the clay formation, gas exchanges andgeochemical reactions. After an early period of re-saturation, solutetransport is supposed to be diffusion-controlled because of the extremelylow permeability of the two media. These coupled processes may lead tochanges in the porosity of the concrete or clay barriers. In the presentpaper, a fully coupled Thermo-Hydro-Chemical (THC) response of atwo-phase (gas and solution) mass-transfer model was evaluated and testedby a sensitivity analysis. This study is an extension of a previous modelapplied to an isothermal and fully saturated concrete/clay interface(Burnol et al., 2005); it investigated the coupled effect of temperatureand unsaturated conditions assuming no production of H2(g). The systemwas simulated for a 2000-year period, which covers the most predominantthermal perturbation.

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  • 3rd International Meeting on Clays in Natural&Engineered Barriers for Radioactive Waste Confinement, Lille,France, 17-20 September 2006

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  • Report No.: LBNL--63365
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 928238
  • Archival Resource Key: ark:/67531/metadc899144

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  • July 1, 2006

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  • Sept. 27, 2016, 1:39 a.m.

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Burnol, A.; Dupros, F.; Spycher, N.; Xu, T. & Gaucher, E.C. Simulation of the degradation of a concrete/clay interface:influence of temperature, unsaturated conditions and porosityvariations, article, July 1, 2006; United States. (digital.library.unt.edu/ark:/67531/metadc899144/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.