2018
DOI: 10.1180/clm.2018.54
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Interactions of bentonite with metal and concrete from the FEBEX experiment: mineralogical and geochemical investigations of selected sampling sites

Abstract: The FEBEX experiment, a full-scale, high-level radioactive waste repository test, ran for ~18 years and hence is the longest-running disposal test to date. The test consisted of a heater emplaced in an envelope of compacted bentonite at the Grimsel test site, Switzerland. The water content of the bentonite was somewhat lower near the heater and increased towards the granite. This phenomenon probably led to gradients in the exchangeable cation population at various locations within the bentonite buffer. The cem… Show more

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Cited by 14 publications
(3 citation statements)
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“…The decrease in CEC at the heater contact has been observed in other in situ experiments [9,11,42,68,69]. The decrease in CEC values may be related to high-temperature conditions, water vapor formation [70], a lower content of smectite or to the decrease in the layer charge of the smectite clay particles.…”
Section: Redistribution Of Cec and Exchangeable Cationssupporting
confidence: 63%
“…The decrease in CEC at the heater contact has been observed in other in situ experiments [9,11,42,68,69]. The decrease in CEC values may be related to high-temperature conditions, water vapor formation [70], a lower content of smectite or to the decrease in the layer charge of the smectite clay particles.…”
Section: Redistribution Of Cec and Exchangeable Cationssupporting
confidence: 63%
“…The samples collected from the FEBEX experiment had a surface of ∼200 cm 2 and therefore a reduced sampling depth (<0.1 mm; Fig. 6a; Kaufhold et al, 2018). The experiment itself was conducted over 18 years, which could be an additional explanation as to why the highest Mg increase was observed in this experiment.…”
Section: Mg Enrichment At the Heatermentioning
confidence: 99%
“…Cation exchange occurred within the Svensk Kärnbränslehantering AB (SKB) tests with maximum canister surface temperatures of ∼140°C (e.g. Karnland et al, 2009;Dohrmann et al, 2013b;Svensson & Hansen, 2013;Kumpaleinen et al, 2016), and even at <100°C (Dohrmann & Kaufhold, 2014), as well as in full-scale experiments at the GTS with a relatively low-salinity groundwater at <100°C (Fernandez et al, 2018;Kaufhold et al, 2018). Particularly interesting is the ABM test series, which used different clays with different initial cation populations.…”
Section: Cation Exchangementioning
confidence: 99%