Hydrogen uptake and diffusion in Callovo-Oxfordian clay rock for nuclear waste disposal technology

Measuring the effective diffusion coefficient of dissolved hydrogen in saturated Boom Clay

“…The effect of moisture content on the sorption capacity was investigated in the experiments on Opalinus Clay by conditioning the clay powders at different relative humidity levels but no relationship could be found between the degree of saturation and the sorption of H 2 . Another difference with the sorption experiments described by Didier et al (2012), Charlet et al (2013) and Bardelli et al (2014) is the state of the samples: the Boom Clay sample was mounted as bulk core, and not as a reconstituted powdered sample like in the experiments reported for the Callovo-Oxfordian Clay and Opalinus Clay. Due to differences in experimental conditions, no direct extrapolation of H 2 sorption behaviour to Boom Clay can be made, but sorption of H 2 on Boom Clay cannot be excluded.…”

“…Data on the adsorption of hydrogen on pure clay minerals are rather scarce . Recently, data on the sorption of hydrogen on dried samples of Callovo-Oxfordian Clay, both raw and purified, have been published by Bardelli et al (2014).…”

“…9% at P H2 = 5 bar). The sorption of hydrogen on Callovo-Oxfordian clay was recently also investigated by Bardelli et al (2014). Samples (dried, both raw and purified COx) were exposed to a H 2 pressure of 60 bar and the sorption of H 2 was measured volumetrically.…”

Method development for evaluating the redox state of Callovo-Oxfordian clayrock and synthetic montmorillonite for nuclear waste management

“…Two pure synthetic Na-montmorillonite samples used in this study, SM1 and SM2, were synthesized and characterized following the work of Reinholdt and collaborators (Reinholdt et al, 2001) and contain 3.2 wt.% and 6.4 wt.% of Fe(III) respectively. All synthetic minerals used in this study had been previously characterized by different techniques (Bardelli et al, 2014;Didier et al, 2012).…”

Migration of Gas in Water Saturated Clays by Coupled Hydraulic-Mechanical Model

“…In classical approaches, several gas transport mechanisms can be active, separately or simultaneously [3,4]. With increasing rates of gas production, gas should be transported first in dissolved state by advection and diffusion [5] and then by the flow of small gas bubbles inside the water phase and by viscocapillary flow of gas inside the water phase, or by the dilatation of existing and creation of new localized pathways [3,6,7]. The ultimate stage appearing at very high gas production rates would be macroscopic fracturing of the host rock; however, it is rather not expected in the case of repositories, where the gas source terms are not sufficient.…”