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Mineralogical changes and associated decrease in tritiated water diffusivity after alteration of cement–bentonite interfaces

Published online by Cambridge University Press:  02 January 2018

Tetsuji Yamaguchi ,
Takuma Sawaguchi ,
Manabu Tsukada ,
Seiichi Hoshino  and
Tadao Tanaka
Tetsuji Yamaguchi*
Affiliation:
Nuclear Safety Research Center, Sector of Nuclear Safety Research and Emergency Preparedness, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
Takuma Sawaguchi
Affiliation:
Nuclear Safety Research Center, Sector of Nuclear Safety Research and Emergency Preparedness, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
Manabu Tsukada
Affiliation:
Nuclear Safety Research Center, Sector of Nuclear Safety Research and Emergency Preparedness, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
Seiichi Hoshino
Affiliation:
Central Research Laboratory, Taiheiyo Cement Corp., 2-4-2 Osaku, Sakura, Chiba 285-8655, Japan
Tadao Tanaka
Affiliation:
Nuclear Safety Research Center, Sector of Nuclear Safety Research and Emergency Preparedness, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
*
*E-mail: [email protected]
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Abstract

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Alteration of cement–bentonite interfaces and accompanying changes in diffusivity of tritiated water (HTO) was investigated experimentally using intact, hardened cement-paste specimens. The alteration by carbonate solution was accompanied by mineralogical changes at the interface and a decrease in the HTO diffusivity to ∼70 ± 7%of the initial value after a 180-day period. Another alteration in contact with compacted bentonite was accompanied by mineralogical changes at the interface and a decrease in the HTO diffusivity to ∼71 ± 10% of the initial value after a 600-day period. The changes in the diffusivity were considerably less than those observed for mixed specimens of ground, granulated hardened cement paste and bentonite where the diffusivity decreased to 20% of the initial value over 180 days. The results were extrapolated to 15 y under simple assumptions and showed good agreement with those observed in the cement–argillite interface at Tournemire URL (France). Such an explanation enhances confidence in the assessment of the alteration of cement-bentonite systems and might be a basis for using the data and models obtained in the long-term assessment of radioactive waste disposal.

Keywords

cement–bentonite interfacediffusivitypore cloggingradioactive waste disposalaccelerated alteration
Type
Research Article
Information
Clay Minerals , Volume 51 , Issue 2 , May 2016 , pp. 279 - 287
Creative Commons
Creative Common License - CCCreative Common License - BY
Copyright © The Mineralogical Society of Great Britain and Ireland 2016 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 2016

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