上載圧下で養生したセメント安定処理土の一軸圧縮強度特性  [in Japanese] UNCONFINED COMPRESSIVE STRENGTH OF CEMENT-STABILIZED SOIL CURED UNDER AN OVERBURDEN PRESSURE  [in Japanese]

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Abstract

セメント安定処理土が施工後の原位置で受ける応力状態を再現するためモールド型圧密養生装置を開発し, それを用いて土の種類, 改良材の種類と添加量, 安定処理時の含水比, 上載圧, 養生時間, 安定処理後に上載圧を載荷するまでの時間を変化させて, 上載圧下で養生した安定処理土の圧密沈下特性と一軸圧縮強度特性を調べた. さらに, 電子顕微鏡観察による微視的構造をもとに圧密現象に伴う密度増加とセメント水和反応に伴うセメンテーションが同時に起こる安定処理土の強度発現機構を考察した. その結果, 安定処理土は固化開始前の初期材齢で圧密に伴う密度増加が認められ, これとセメンテーションの進行との相乗効果により, その後に発揮される強度・変形特性が従来の大気圧下養生の場合と比べて著しく相違することが明らかになった.

The effect of the overburden pressure during curing on the unconfined compressive strength of cement-stabilized soils was examined using a newly developed apparatus, which could apply an overburden pressure below 150kPa to a cement-stabilized soil under an one-dimensional consolidation condition. The test results showed that the unconfined compressive strength of the cement-stabilized soil increased linearly with the increase of overburden pressure. The cement-stabilized soil cured under the overburden pressure showed a brittle shear behavior as compared with that cured soil under no overburden pressure. Furthermore, scanning electron microscope observations clarified that the cement-stabilized soil cured under the overburden pressure had a very stiff microstructure.

Journal

  • Doboku Gakkai Ronbunshu

    Doboku Gakkai Ronbunshu 701, 387-399, 2002-03-21

    Japan Society of Civil Engineers

References:  21

Cited by:  1

Codes

  • NII Article ID (NAID)
    10008001974
  • NII NACSIS-CAT ID (NCID)
    AN10014020
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    02897806
  • NDL Article ID
    6100936
  • NDL Source Classification
    ZN1(科学技術--建設工学・建設業)
  • NDL Call No.
    Z16-6
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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