海水曝露した石灰処理土の表面に生成される白色析出物とその劣化抑制効果  [in Japanese] WHITE SEDIMENTS ON SURFACE OF LIME STABILIZED CLAY UNDER SEAWATER AND ITS DETERIORATION SUPPRESSION EFFECT  [in Japanese]

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Abstract

固化処理土は海水に曝露するとその表面において,白色の析出物が生じる場合がある.本研究では,粘性土試料を母材とした石灰処理土に対して,海水を模擬したマグネシウム水溶液への浸漬実験を実施し,処理土表面に生成される析出物について観察・分析を行うとともに析出物生成の有無による石灰処理土のカルシウム溶出挙動および力学的劣化状況の差異を検討した.その結果,比較的石灰添加量が多いケースで処理土表面に析出物の生成が確認された.この析出物は球体状の水酸化マグネシウムと推定され,その緻密な構造によって処理土からのカルシウムの溶出,ひいては力学的劣化の進行を抑制する効果を持つことを示した.

 When chemical stabilized soil is exposed to seawater, white color sediments may be observed at boundary between seawater and the soil. In this study, in order to investigate difference of calcium leaching behavior and mechanical deterioration degree of stabilized soil due to presence of the sediments on the surface of lime stabilized clay, an immersion test which was simulated marine environment was conducted. As a result, white color sediments were generated on the surface of the lime stabilized clay specimen with relatively high stabilizer content. The sediments were estimated spherical magnesium hydroxide by scanning electron microscopy observation and elemental analysis, and it is verified that calcium leaching and mechanical deterioration of stabilized clay were suppressed due to fine structure of the sediments.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)

    Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering) 73(2), 224-232, 2017

    Japan Society of Civil Engineers

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