The gas permeability, breakthrough behaviour and re-sealing ability of Czech Ca–Mg bentonite

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F16%3A00301983" target="_blank" >RIV/68407700:21110/16:00301983 - isvavai.cz</a>

Result on the web

<a href="http://doi.org/10.1144/SP443.5" target="_blank" >http://doi.org/10.1144/SP443.5</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1144/SP443.5" target="_blank" >10.1144/SP443.5</a>

Result language

angličtina

Original language name

The gas permeability, breakthrough behaviour and re-sealing ability of Czech Ca–Mg bentonite

Original language description

The study's objectives were to test the gas permeability of unsaturated compacted bentonite, the gas-breakthrough behaviour of saturated bentonite, and the re-sealing ability compared with the material's dry density, hydraulic conductivity and swelling pressure. During the project's pilot phase, a series of laboratory experiments were conducted on samples of two Czech Ca–Mg bentonites (Bentonite 75 and Cerny Vrch). The testing procedure, employing repeated hydration and gas-breakthrough test phases, simulated conditions within deep geological repositories for radioactive waste, wherein the buffer will be progressively hydrated from the surrounding host rock and loaded with pressure exerted by gases created within the repository. It was found that the gas permeability of the bentonites tested was affected by dry density and, as with the two materials (FEBEX and MX-80) used for comparison, it correlated well with the accessible void ratio. Gas-breakthrough tests revealed correlations between time to breakthrough and both dry density and sample height. The recorded repeated test breakthrough times on the same samples varied, which implies that the pathways created are complex and differ for repeated gas-injection cycles. However, no systematic deterioration in sample properties was detected, thus indicating the extensive re-sealing ability of the materials tested.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

JN - Civil engineering

OECD FORD branch

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Project

<a href="/en/project/GA14-19655S" target="_blank" >GA14-19655S: Gas migration through (compacted) smectitic clays</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Geological Society Special Publication

ISSN

2041-4927

e-ISSN

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Volume of the periodical

443

Issue of the periodical within the volume

443

Country of publishing house

GB - UNITED KINGDOM

Number of pages

16

Pages from-to

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UT code for WoS article

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EID of the result in the Scopus database

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