Experimental study on swelling characteristics of sand-bentonite mixture for nuclear waste disposal

Hideo Komine, Nobuhide Ogata

Research output: Contribution to journalArticle

117 Citations (Scopus)

Abstract

A mixture of sand and bentonite is seen as an effective component of artificial barriers for disposal facilities of radioactive wastes from nuclear power stations. Therefore, to design and construct these facilities, we must evaluate the swelling characteristics of sand-bentonite mixtures. For this purpose, various laboratory tests on the swelling pressure and swelling deformation of sand-bentonite mixtures were performed. To discuss the process of the swelling characteristics of these mixtures, this study also observed the swelling behavior of bentonite in the mixtures using a scanning electron microscope which can control the temperature and vapor pressure around samples. The following conclusions were obtained through this study. (i) The swelling characteristics of sand-bentonite mixtures is dependent on the dry density and bentonite content of mixtures. (ii) From observation with the scanning electron microscope, we found that the voids of mixtures are filled up by the volume increase when bentonite absorbs water. Furthermore, the swelling process of sand-bentonite mixtures was considered on the basis of the swelling behavior of montmorillonite, a swelling clay mineral. (iii) This study proposes the simplified evaluation of the swelling characteristics of sand-bentonite mixtures using the parameter "Swelling volumetric strain of montmorillonite". This evaluation can obtain the maximum swelling pressure and the maximum swelling strain of sand-bentonite mixtures at various dry densities and bentonite contents. Therefore, this simplified evaluation is available when the disposal facilities of nuclear wastes will be designed and constructed.

Original languageEnglish
Pages (from-to)83-97
Number of pages15
JournalSoils and Foundations
Volume39
Issue number2
Publication statusPublished - 1999
Externally publishedYes

Fingerprint

Bentonite
Radioactive wastes
bentonite
Waste disposal
waste disposal
radioactive waste
swelling
Swelling
Sand
experimental study
sand
Clay minerals
dry density
montmorillonite
Electron microscopes
Scanning
electron
nuclear power plant
Vapor pressure
vapor pressure

Keywords

  • Bentonite
  • Laboratory test
  • Nuclear waste disposal
  • Scanning electron microscope
  • Swelling (IGC: B10/B12/D5)

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Geotechnical Engineering and Engineering Geology

Cite this

Experimental study on swelling characteristics of sand-bentonite mixture for nuclear waste disposal. / Komine, Hideo; Ogata, Nobuhide.

In: Soils and Foundations, Vol. 39, No. 2, 1999, p. 83-97.

Research output: Contribution to journalArticle

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