Laboratory experiments on bentonite pellet saturation

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46356088%3A_____%2F17%3AN0000033" target="_blank" >RIV/46356088:_____/17:N0000033 - isvavai.cz</a>

Alternative codes found

RIV/68407700:21110/17:00330869

Result on the web

<a href="http://dx.doi.org/10.1144/SP443.22" target="_blank" >http://dx.doi.org/10.1144/SP443.22</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1144/SP443.22" target="_blank" >10.1144/SP443.22</a>

Result language

angličtina

Original language name

Laboratory experiments on bentonite pellet saturation

Original language description

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.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20701 - Environmental and geological engineering, geotechnics

Project

<a href="/en/project/7G13002" target="_blank" >7G13002: Full Scale Demonstration of Plugs and Seals</a><br>

Continuities

R - Projekt Ramcoveho programu EK

Publication year

2017

Confidentiality

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

Article name in the collection

Radioactive Waste Confinement: Clays in Natural and Engineered Barriers

ISBN

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ISSN

0305-8719

e-ISSN

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Number of pages

11

Pages from-to

73-83

Publisher name

Geological Society of London

Place of publication

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Event location

Brussels, Belgium

Event date

Jan 1, 2015

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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