New equations for swelling characteristics of bentonite-based buffer materials

Hideo Komine*, Nobuhide Ogata

*この研究の対応する著者

研究成果: Article査読

108 被引用数 (Scopus)

抄録

Compacted bentonite and sand-bentonite mixtures are attracting greater attention as buffer material for repositories of high-level nuclear waste. This buffer material is expected to fill up the space between the canisters containing the waste and the surrounding ground by swelling. To produce the specifications, such as dry density, sand-bentonite mass ratio, and dimensions, of the buffer material, the swelling characteristics of compacted bentonite and sand-bentonite mixtures must be evaluated quantitatively. New equations for evaluating the swelling behavior of compacted bentonite and sand-bentonite mixtures are presented that can accommodate the influences of the sand-bentonite mass ratio and the exchangeable-cation composition of bentonite. The new method for predicting swelling characteristics is presented by combining the new equations with the theoretical equations of the Gouy-Chapman diffuse double layer theory and of the van der Waals force, which can evaluate the repulsive and attractive forces of montmorillonite mineral (i.e., the swelling clay mineral in bentonite). Furthermore, the applicability of the new prediction method has been confirmed by comparing the predicted results with laboratory test results on the swelling deformation and swelling pressure of compacted bentonites and sand-bentonite mixtures.

本文言語English
ページ(範囲)460-475
ページ数16
ジャーナルCanadian geotechnical journal
40
2
DOI
出版ステータスPublished - 2003 4月 1
外部発表はい

ASJC Scopus subject areas

  • 土木構造工学
  • 地盤工学および土木地質学

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