Ultrasonic measurement in variation of a degree of saturation in compacted bentonite

Shun Kimura, Kazumi Kitayama, Kazushi Kimoto, Katsuyuki Kawamura, Hiroshige Kikura

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

Bentonite, which is a kind of clay, is considered as a candidate for a buffer material in a geological repository of the high-level radioactive waste. Bentonite could provide long-term isolation of the radioactive waste because of its high adsorption capacity, low water permeability and good swelling property. In the context of long-term safety of disposal management, understanding groundwater behavior in bentonite buffer is one of the important issues, related to evaluating its long-term performance. In order to understand water behavior in compacted bentonite, the ultrasonic measurement was focused on. However, Ultrasonic wave propagation in compacted bentonite has not been understood well. Therefore, in this study, high spatial measurement system with Laser Doppler Vibrometer was developed in order to observe the ultrasonic wave propagation in compacted bentonite specimen. Ultrasonic wave propagation in compacted bentonite surface was measured. As a result, ultrasonic wave reflection was observed on the boundary between two different degrees of saturation. Thus, the capability of the developed system for investigation of the wave propagation in compacted bentonite is confirmed.

Original languageEnglish
Pages (from-to)428-435
Number of pages8
JournalEnergy Procedia
Volume131
DOIs
Publication statusPublished - Jan 1 2017

Fingerprint

Ultrasonic measurement
Bentonite
Ultrasonic propagation
Radioactive wastes
Ultrasonic reflection
Geological repositories
Wave propagation
Swelling
Water
Groundwater
Clay
Adsorption
Lasers

Keywords

  • Bentonite
  • Degree of saturation
  • Geological disposal
  • Laser Doppler Vibrometer
  • Ultrasonic measurement

ASJC Scopus subject areas

  • Energy(all)

Cite this

Ultrasonic measurement in variation of a degree of saturation in compacted bentonite. / Kimura, Shun; Kitayama, Kazumi; Kimoto, Kazushi; Kawamura, Katsuyuki; Kikura, Hiroshige.

In: Energy Procedia, Vol. 131, 01.01.2017, p. 428-435.

Research output: Contribution to journalConference article

Kimura, Shun ; Kitayama, Kazumi ; Kimoto, Kazushi ; Kawamura, Katsuyuki ; Kikura, Hiroshige. / Ultrasonic measurement in variation of a degree of saturation in compacted bentonite. In: Energy Procedia. 2017 ; Vol. 131. pp. 428-435.
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