Advertisement

Evaluating Influence of Cementation in Bentonite Buffer Material Based on the Swelling Properties of Bentonite Ore

  • D. Ito
  • H. Komine
  • S. Morodome
  • T. Sekiguchi
  • G. Miura
Conference paper
Part of the Environmental Science and Engineering book series (ESE)

Abstract

In geological disposal of high level radioactive waste, it is essential to start considering consolidation accompanying cementation, taking into consideration high earth pressure and solution of groundwater. For engineering application of natural analogue, the authors thought consolidated buffer material will have similar physical properties to bentonite ore. In this study, we aimed to quantitatively evaluate the influence of cementation on swelling properties. In order to achieve this aim, we focused on swelling pressure and swelling strain of bentonite, using two kinds of bentonite ore whose generation dates are different respectively. As a result, swelling pressure was decreased by approximately one order of magnitude due to the influence of cementation. In addition, the swelling strain of younger bentonite ore did not decline, but those of older bentonite ore declined about half of original whether consolidation was retained or not. Therefore, there is a possibility that the swelling deformation of buffer will decline as cementation gets stronger over the course of time.

Keywords

Bentonite Swelling Cementation Radioactive waste Long-term alteration 

Notes

Acknowledgement

This research was conducted with support from ‘Waseda University Grants for Special Research Project (Grant B, 2017)’. Also, we got the bentonite ore samples by the support from Dr. M. Ito (Kunimine Industries) and Kunimain Co., Ltd.

References

  1. Ogata N et al (1999) Enterprise technology for high level radioactive waste geological disposal,-volume 4. Des Manufact Proced Eng Barrier- J Nucl Fuel Cycle Environ 5(2):103–121CrossRefGoogle Scholar
  2. Pusch R (1983) Stability of deep-sited smectite minerals in crystalline rock – chem1ical aspects- SKBF-KBS TR83-16, p 1Google Scholar
  3. Japan Bentonite Association (1977a) Japan Bentonite association standard, JBAS-107-91Google Scholar
  4. Japan Bentonite Association (1977b) Japan Bentonite association standard, JBAS-104-77Google Scholar
  5. Komine H, Ogata N (1994) Experimental study on swelling characteristics of compacted bentonite. Can Geotech J 31(4):478–490CrossRefGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • D. Ito
    • 1
  • H. Komine
    • 1
  • S. Morodome
    • 1
  • T. Sekiguchi
    • 1
  • G. Miura
    • 1
  1. 1.Department of Civil and Environmental EngineeringWaseda UniversityTokyoJapan

Personalised recommendations