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Hydraulic conductivity and specific storage of bentonite following prolonged thermal exposure

Harrington, J.F.; Noy, D.J.. 2011 Hydraulic conductivity and specific storage of bentonite following prolonged thermal exposure. Nottingham, UK, British Geological Survey, 14pp. (CR/11/036N)

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Abstract/Summary

The scope of this study was to determine the hydraulic properties of a specimen of bentonite which had previously been exposed to elevated temperatures during the Canister Retrieval Test (CRT) performed at the Äspö Hard Rock Laboratory. A series of well-constrained hydraulic measurements were performed on a specimen of compact bentonite, that had been situated close to the canister, yielded a mean hydraulic conductivity of 4.77x10-14 m/s (standard deviation = 0.49 x10-14 m/s) using fluxes ranging from 1.6 to 4.6 µl/h and a mean specific storage coefficient for the same range of flux of 1.64x10-5 m-1 (standard deviation = 0.61 x10 5 m-1). Data from this study are in close agreement with observations for unaltered saturated bentonite. Based on these observations, the BGS find no evidence for an adverse increase in hydraulic conductivity of bentonite as a result of its exposure to temperatures up about 80ºC for around 5 years.

Item Type: Publication - Report (UNSPECIFIED)
Programmes: BGS Programmes 2010 > Minerals and waste
Funders/Sponsors: Svensk Kärnbränslehantering AB
Additional Information. Not used in RCUK Gateway to Research.: This item has been internally reviewed but not externally peer-reviewed. This report made open by authors January 2013
Additional Keywords: Hydraulic conductivity, permeability, threshold, Mx80, bentonite, Canister Retrieval Test.
NORA Subject Terms: Earth Sciences
Date made live: 08 Jan 2013 16:39 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/20819

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