The response of Opalinus Clay when exposed to cyclic relative humidity variations
Open access
Date
2017-03-30Type
- Journal Article
Abstract
Clay shale specimens were exposed to cyclic relative humidity (RH) variations to investigate the response of the material to natural environmental changes. Opalinus Clay, a clay shale chosen as host rock for nuclear waste disposal in Switzerland, was utilized. The specimens were exposed to stepwise relative humidity cycles in which they were alternately allowed to equilibrate at 66 and 93 % relative humidity. Principal strains were monitored throughout the experiments using strain gauges. After each relative humidity cycle, Brazilian tensile strength tests were performed to identify possible changes in tensile strength due to environmental degradation.
Results showed that Opalinus Clay follows a cyclic swelling–shrinkage behaviour with irreversible expansion limited to the direction normal to bedding, suggesting that internal damage is restricted along the bedding planes. The Brazilian tensile strength in direction parallel and normal to bedding as well as the water retention characteristic remained unaffected by the RH variations. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000190427Publication status
publishedExternal links
Journal / series
Solid EarthVolume
Pages / Article No.
Publisher
CopernicusOrganisational unit
03465 - Löw, Simon (emeritus) / Löw, Simon (emeritus)
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Is new version of: https://doi.org/10.3929/ethz-b-000124806
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