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Development of a reactive transport code MC-CEMENT ver. 2 and its verification using 15-year in situ concrete/clay interactions at the Tournemire URL†

Published online by Cambridge University Press:  09 July 2018

T. Yamaguchi ,
M. Kataoka ,
T. Sawaguchi ,
M. Mukai ,
S. Hoshino ,
T. Tanaka ,
F. Marsal  and
D. Pellegrini
T. Yamaguchi*
Affiliation:
Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
M. Kataoka
Affiliation:
Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
T. Sawaguchi
Affiliation:
Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
M. Mukai
Affiliation:
Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
S. Hoshino
Affiliation:
Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
T. Tanaka
Affiliation:
Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
F. Marsal
Affiliation:
Institute for Radiological Protection and Nuclear Safety, BP 17 92262 Fontenay-aux-Roses, France
D. Pellegrini
Affiliation:
Institute for Radiological Protection and Nuclear Safety, BP 17 92262 Fontenay-aux-Roses, France
*
*E-mail: [email protected]
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Abstract

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Highly alkaline environments induced by cement-based materials are likely to cause the physical and/or chemical properties of the bentonite buffer materials in radioactive waste repositories to deteriorate. Assessing long-term alteration of concrete/clay systems requires physicochemical models and a number of input parameters. In order to provide reliability in the assessment of the long-term performance of bentonite buffers under disposal conditions, it is necessary to develop and verify reactive transport codes for concrete/clay systems. In this study, a PHREEQC-based, reactive transport analysis code (MC-CEMENT ver. 2) was developed and was verified by comparing results of the calculations with in situ observations of the mineralogical evolution at the concrete/argillite interface. The calculation reproduced the observations such as the mineralogical changes in the argillite limited to within 1 cm in thickness from the interface, formation of CaCO3 and CSH, dissolution of quartz, decrease of porosity in the argillite and an increase in the concrete. These agreements indicate a possibility that models based on lab-scale (∼1 year) experiments can be applied to longer time scales although confidence in the models is necessary for much longer timescales. The fact that the calculations did not reproduce the dissolution of clays and the formation of gypsum indicates that there is still room for improvement in our model.

Keywords

alterationbentonitecement-clayradioactive waste disposalreactive transport codeverificationTournemireURL
Type
Research Article
Information
Clay Minerals , Volume 48 , Issue 2 , May 2013 , pp. 185 - 197
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

Footnotes

†

Part of this study was funded by the Secretariat of Nuclear Regulation Authority, Nuclear Regulation Authority, Japan

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