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Microstructural investigation of calcium montmorillonite

Published online by Cambridge University Press:  09 July 2018

M. Matusewicz ,
K. Pirkkalainen ,
V. Liljeström ,
J. -P. Suuronen ,
A. Root ,
A. Muurinen ,
R. Serimaa  and
M. Olin
M. Matusewicz*
Affiliation:
VTT Technical Research Centre of Finland, P.O. Box 1000, FI-02044 VTT, Finland
K. Pirkkalainen
Affiliation:
Department of Physics, University of Helsinki, P.O. Box 64, FI-00014, University of Helsinki, Finland
V. Liljeström
Affiliation:
Department of Physics, University of Helsinki, P.O. Box 64, FI-00014, University of Helsinki, Finland
J. -P. Suuronen
Affiliation:
Department of Physics, University of Helsinki, P.O. Box 64, FI-00014, University of Helsinki, Finland
A. Root
Affiliation:
MagSol, Tuhkanummenkuja 2, FI-00970 Helsinki, Finland
A. Muurinen
Affiliation:
VTT Technical Research Centre of Finland, P.O. Box 1000, FI-02044 VTT, Finland
R. Serimaa
Affiliation:
Department of Physics, University of Helsinki, P.O. Box 64, FI-00014, University of Helsinki, Finland
M. Olin
Affiliation:
VTT Technical Research Centre of Finland, P.O. Box 1000, FI-02044 VTT, Finland
*
*E-mail: michal.matusewicz@vtt.fi
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Abstract

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Bentonite clay is planned to form a part of deep-geological repositories of spent nuclear fuel in several countries. The extremely long operation time of the repository requires an indepth understanding of the structure and properties of used materials. In this work the microstructure of a simplified system of Ca-montmorillonite is investigated using a set of complementary methods: X-ray diffraction, small angle X-ray scattering, nuclear magnetic resonance, transmission electron microscopy and ion exclusion. The paper presents experimental results obtained from compacted, water saturated samples in the dry density range 0.6–1.5 g/cm3. It can be observed that different methods yield similar quantification of water present in the interlamellar space. Combined results support the multiple porosity concept of the bentonite structure.

Keywords

HLW repositoriesbentonite buffermicrostructuremontmorillonitecalcium
Type
Research Article
Information
Clay Minerals , Volume 48 , Issue 2 , May 2013 , pp. 267 - 276
Creative Commons
Creative Common License - CCCreative Common License - BY
Copyright © The Mineralogical Society of Great Britain and Ireland 2013 This is an Open Access article, distributed under the terms of the Creative Commons Attribution license. (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2013

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