Determination of the permeability of the Callovo-Oxfordian clay at the metre to decametre scale

Enssle, Carl Philipp; Cruchaudet, M.; Croisé, Jean; Brommundt, Jürgen

doi:10.1016/j.pce.2011.07.031

Cited by 17 publications

(16 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The leakage rate values and the dimensions for the circular gaskets mentioned by Hoyes and Rautanen (2013) and Rautanen et al (2014) indicate that the radial permeability of a vermiculite (i.e., "Thermiculite® 866") based gasket should be lower than 10 − 16 m 2 under 10 MPa at 1 bar pressure of He, in agreement with our lower radial permeability values (2 · 10 −19 m 2 ). Moreover, this radial permeability value agrees with the values reported for natural clays at nitrogen or air pressure of about 5 bar (Yang, 2008) or intrinsic permeability values of CallovoOxfordian clay (Enssle et al, 2011;Shao et al, 2011). This permeability value (~2 · 10 − 19 m 2 ) was higher than the one of the exfoliated graphite pressed at 80 MPa measured in the same conditions (35 MPa, 5 bar He) at 10 −20 m 2 .…”

Section: The Contact and Permeability Leakssupporting

confidence: 89%

“…The κ a /κ c ratio of the permeabilities became 16,000 for the same gaskets annealed at 600°C, which might be explained by the linkage of the vermiculite particles during heating (related to the dehydroxylation of the layer edge), as shown by Nguyen et al (2014) by scanning electron microscopy analysis, that could limit the gas transport. The values of in plane intrinsic permeabilities were found to be in agreement with the ones of compacted clay soils (Yang, 2008;Enssle et al, 2011;Shao et al, 2011) in the range of 10 −19 -10 −20 m 2 . At room temperature, we have found a correlation between the decrease of the leak rate and the increase of the resiliency.…”

Section: Resultssupporting

confidence: 72%

See 1 more Smart Citation

Room temperature and high temperature sealing properties and compression properties of compressive gaskets made of micrometric vermiculite particles

Nguyen

Mirabel

Duclaux

et al. 2015

Applied Clay Science

View full text Add to dashboard Cite

Section: The Contact and Permeability Leakssupporting

confidence: 89%

Section: Resultssupporting

confidence: 72%

Room temperature and high temperature sealing properties and compression properties of compressive gaskets made of micrometric vermiculite particles

Nguyen

Mirabel

Duclaux

et al. 2015

Applied Clay Science

View full text Add to dashboard Cite

“…In Belgium, Switzerland and France, argillaceous formations are being explored as potential host formations for this purpose. The clays under consideration have a high sorption capacity for many radionuclides (Maes et al 2004(Maes et al , 2008Altmann et al 2012), low hydraulic conductivity (Enssle et al 2011;Yu et al 2013) and self-sealing properties (Van Geet et al 2008;Zhang 2013).…”

mentioning

confidence: 99%

Measuring diffusion coefficients of dissolved He and Ar in three potential clay host formations: Boom Clay, Callovo-Oxfordian Clay and Opalinus Clay

Jacops

Maes

Bruggeman

2016

View full text Add to dashboard Cite

For the long-term management of high-and intermediate-level radioactive waste and/ or spent fuel, many countries prefer disposal in a geological repository. In Belgium, Switzerland and France, argillaceous formations are being explored as potential host formations for this purpose. In this context, knowledge of the diffusion coefficient of He is relevant within two research areas: first, diffusion coefficients are used in safety calculations to evaluate the balance between gas generation (mainly H 2 ) and gas dissipation; and, second, the diffusion coefficients of He and Ar are needed in the diffusion models of natural tracers. Owing to the lack of data on the diffusion coefficients of He and Ar for the different clay host formations, diffusion experiments with dissolved He and Ar were performed on Boom Clay, Opalinus Clay and Callovo-Oxfordian Clay. Samples were confined in a diffusion cell, and diffusion coefficients were measured by using the double throughdiffusion technique. The diffusion coefficients (D p or D pore ) for He in Boom Clay, Callovo-Oxfordian Clay and Opalinus Clay are 12.6 × 10 210 , 4.51 × 10 210 and 7.13 × 10 210 m 2 s 21 , respectively. The diffusion coefficients for Ar in Boom Clay, Callovo-Oxfordian Clay and Opalinus Clay are 18.6 × 10 211 , 4.06 × 10 211 and 3.65 × 10 211 m 2 s 21 , respectively.

show abstract

“…The use of clay-based materials as engineered barriers is studied in, for example, Switzerland [4], France [5], and Sweden [6]. The clays under consideration all have a high sorption capacity for many radionuclides [7][8][9], a low hydraulic conductivity [10,11], and interesting self-sealing properties [12,13].…”

Section: Introductionmentioning

confidence: 99%

The Dependency of Diffusion Coefficients and Geometric Factor on the Size of the Diffusing Molecule: Observations for Different Clay-Based Materials

et al. 2017

View full text Add to dashboard Cite

In order to investigate in more detail the relation between the size of diffusing molecules and their diffusion coefficients (and geometric factors), diffusion experiments with gases of different size and tritiated water (HTO) have been performed on different clayey samples (Boom Clay, Eigenbilzen Sands, Opalinus Clay, Callovo-Oxfordian Clay, and bentonite with different dry densities). We observed that, for unreactive gases in clayey materials, the effective diffusion coefficient varies with the size of the diffusing molecule and this variation can be described by an exponential or a power law function. The variation of the geometric factor can also be described by an exponential function. The observed experimental relations can be used to estimate diffusion coefficients; by measuring experimentally in clay the effective diffusion coefficient of two unreactive dissolved gases with a different size, the diffusion coefficients of other dissolved gases (with a size in between the two measured gases) can be estimated by using the fitted exponential relationship.

show abstract

Determination of the permeability of the Callovo-Oxfordian clay at the metre to decametre scale

Cited by 17 publications

References 6 publications

Room temperature and high temperature sealing properties and compression properties of compressive gaskets made of micrometric vermiculite particles

Room temperature and high temperature sealing properties and compression properties of compressive gaskets made of micrometric vermiculite particles

Measuring diffusion coefficients of dissolved He and Ar in three potential clay host formations: Boom Clay, Callovo-Oxfordian Clay and Opalinus Clay

The Dependency of Diffusion Coefficients and Geometric Factor on the Size of the Diffusing Molecule: Observations for Different Clay-Based Materials

Contact Info

Product

Resources

About