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- W2065798418 abstract "Heat generated by high level radioactive wastes could alter the performance of a clay repository. It was intended to investigate the effect of such a thermal period on the diffusive properties of Callovo–Oxfordian claystones. Thus, through-diffusion experiments with HTO, Cl-36, Na-22 and Cs-137 were performed before, during and after stages of heating at 80 °C that lasted for up to one year. A special attention was paid to limit the occurrence of any chemical disturbance. Therefore (i) the temperature was raised to 80 °C, then progressively brought back to 21 °C, thanks to three intermediate temperature stages, and (ii) specific synthetic solutions were used for each temperature, chemistry of which being close to the equilibrium state, especially with respect to the carbonate and sulphate minerals. It was found that experiments carried out at 80 °C showed a clear increase of the effective diffusion coefficient values for the four tracers with respect to those obtained at 21 °C (by a factor of 3 for HTO and Cl-36, 5 for Na-22 and 2 for Cs-137). On the other hand, the porosity and rock capacity values did not exhibit any significant discrepancy between 21 °C and 80 °C, indicating no observable damage of both the pore conducing network and the sorption properties of clay minerals. The Stokes–Einstein relationship, based on the temperature dependency of the viscosity of bulk water, could be used to describe the temperature dependence of the diffusion of HTO and Cl-36 but failed to describe the diffusive evolution of the two sorbing cations, Na-22 and Cs-137. Furthermore, experiments performed after the thermal period led to diffusive properties well matching those obtained before heating. All these results suggest that at the lab scale the heating of rock samples would not alter the claystone containment properties." @default.
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- W2065798418 date "2011-07-01" @default.
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- W2065798418 title "Effect of temperature on the containment properties of argillaceous rocks: The case study of Callovo–Oxfordian claystones" @default.
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- W2065798418 doi "https://doi.org/10.1016/j.jconhyd.2011.05.004" @default.
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