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State of a Bentonite Barrier after 8 Years of Heating and Hydration in the Laboratory

Published online by Cambridge University Press:  19 October 2011

Maria Victoria Villar ,
Ana María Fernández ,
Roberto Gómez ,
José F. Barrenechea ,
F. Javier Luque ,
Pedro Luis Martín  and
José Miguel Barcala
Maria Victoria Villar
Affiliation:
mv.villar@ciemat.es, CIEMAT, Engineered and Geological Barriers, Avd. Complutense 22, Madrid, 28040, Spain
Ana María Fernández
Affiliation:
anamaria.fernandez@ciemat.es, CIEMAT, Madrid, 28040, Spain
Roberto Gómez
Affiliation:
robert.gomez@ciemat.es, CIEMAT, Madrid, 28040, Spain
José F. Barrenechea
Affiliation:
barrene@geo.ucm.es, UCM, Madrid, 28040, Spain
F. Javier Luque
Affiliation:
jluque@geo.ucm.es, UCM, Madrid, 28040, Spain
Pedro Luis Martín
Affiliation:
pedro.lmartin@ciemat.es, CIEMAT, Madrid, 28040, Spain
José Miguel Barcala
Affiliation:
miguel.barcala@ciemat.es, CIEMAT, Madrid, 28040, Spain
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Abstract

The conditions of the bentonite in an engineered barrier for HLW disposal have been simulated in a laboratory test. Six cylindrical blocks of bentonite compacted at a dry density of 1.64 g/cm3 were piled up in a hermetic Teflon cell. The total length of clay inside the cell was 60 cm. The bottom surface of the bentonite was heated at 100°C while the top surface was injected with granitic water. The duration of the test was 7.6 years. The water intake was measured during the test and, at the end, the cell was dismounted and the dry density, water content, specific surface area, mineralogy, geochemistry and swelling capacity of the clay were measured in different sections along the blocks. The material used in this test is the FEBEX bentonite.

Keywords

barrier layerwaste managementchemical reaction
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 985: Symposium NN – Scientific Basis for Nuclear Waste Management XXX , 2006 , 0985-NN11-19
Copyright
Copyright © Materials Research Society 2007

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References

1. ENRESA 2000. FEBEX Project. Full-scale engineered barriers experiment for a deep geological repository for high level radioactive waste in crystalline host rock. Final Report. Publicación Técnica ENRESA 1/2000. 354 pp. Madrid.Google Scholar
2. Villar, M.V.; Fernández, A.M. & Gómez, R. 2006. Effect of heating/hydration on bentonite: test in a 60-cm long cell. NF-PRO Project, Deliverables 2.2.7 and 3.2.10.CIEMAT Technical Report, Madrid.Google Scholar