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1 results

  • Smectite in Marine Quick-Clays of Japan

  • Kazuhiko Egashira, Masami Ohtsubo
  • Journal:
    Clays and Clay Minerals / Volume 30 / Issue 4 / August 1982
    Published online by Cambridge University Press:
    02 April 2024, pp. 275-280
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  • Clayey sediments of marine origin having sensitivities (ratio of undisturbed to remolded shear strength) as high as 1000 at a reduced salt concentration are found around Ariake Bay, Kyushu, Japan. The clay fraction of the sediments contains smectite as a principal mineral (33–42%) in contrast to the illitic composition of most previously described quick-clays. However, this smectite is a low-swelling type, and the Na-form expands only to about the same extent as the Ca-form and gives a sediment volume almost equal to that of the Ca-clay. This low-swelling smectite appears to consist of packets of unit layers even after saturation with Na, and thus reacts like the kaolinite or illite of conventional quick-clays.