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Book Chapter

Laboratory experiments on bentonite pellet saturation

By
Dagmar Trpkošová
Dagmar Trpkošová
ÚJV Řež, a. s., Hlavní 130, 250 68 Husinec-Řež, Czech Republic
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Petr Večerník
Petr Večerník
ÚJV Řež, a. s., Hlavní 130, 250 68 Husinec-Řež, Czech Republic
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Jenny Gondolli
Jenny Gondolli
ÚJV Řež, a. s., Hlavní 130, 250 68 Husinec-Řež, Czech Republic
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Václava Havlová
Václava Havlová
ÚJV Řež, a. s., Hlavní 130, 250 68 Husinec-Řež, Czech Republic
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Jiří Svoboda
Jiří Svoboda
Centre of Experimental Geotechnics, Czech Technical University in Prague, Thákurova 7, 166 29 Prague 6, Czech Republic
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Irena Hanusová
Irena Hanusová
SÚRAO, Dlážděná 6, 110 00 Prague 1, Czech Republic
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Published:
January 01, 2017

Abstract

The aim of the DOPAS project is to address the design basis, reference designs and strategies for the plugs and seals to be used in geological disposal facilities. The Czech ‘Experimental Pressure and Sealing Plug’ (EPSP) experiment has the following objectives: to develop, monitor and verify the functionality of an in situ experimental plug, and to determine and describe in detail the materials to be used with respect to experimental plug construction. The functionality of the experimental plug will be verified by means of conducting pressure tests after the construction phase of EPSP. The internal bentonite section of the EPSP will be constructed from bentonite pellets with a dry density of 1850 kg m−3; the pellets will disintegrate following saturation and swelling to form a homogeneous material with a dry density of around 1400 kg m−3. This process leads to the question of the pore space of the bentonite material: that is, whether it will be possible to employ a numerical model for homogeneous compacted bentonite powder porosity instead of that of the double pore/void space of the bentonite pellets used in the experiment. For this reason, a laboratory physical model (PHM – physical hydraulic model) was incorporated into the DOPAS project for the purpose of describing the saturation and disintegration of the bentonite pellets. The aim of this paper is to describe the results of the space distribution of relative humidity in a sample consisting of bentonite pellets with a view to subsequent numerical modelling and to extend the current knowledge concerning the behaviour of the bentonite pellets used in the EPSP experiment. The results show that following water saturation and the swelling of the bentonite the pellets form a homogeneous mass in the same way as does the compacted bentonite powder. After a period of 160 days, the pellets attained 100% relative humidity at a distance of 12.5 cm and swelling pressure recorded at the end of the model was seen to slowly increase over this time period.

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Geological Society, London, Special Publications

Radioactive Waste Confinement: Clays in Natural and Engineered Barriers

S. Norris
S. Norris
Radioactive Waste Management, UK
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J. Bruno
J. Bruno
Amphos 21, Spain
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M. van Geet
M. van Geet
ONDRAF/NIRAS, Belgium
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E. Verhoef
E. Verhoef
COVRA, The Netherlands
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Geological Society of London
Volume
443
ISBN electronic:
9781786203267
Publication date:
January 01, 2017

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