An Experimental Study on Strength of Fiber-Cement-Stabilized Mud by use of Paper Sludge and Durability for Drying and Wetting Tests

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  • MORI Masato
    Mori Institute for Environmental Technology
  • TAKAHASHI Hiroshi
    Dept. of Environmental Studies,Graduate School of Environmental Studies,Tohoku University
  • KUMAKURA Koji
    Dept. of Environmental Studies,Graduate School of Environmental Studies,Tohoku University

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Other Title
  • ペーパースラッジを用いた繊維質固化処理土の強度特性および乾湿繰り返し試験における耐久性に関する実験的研究
  • ペーパースラッジ オ モチイタ センイシツコカ ショリド ノ キョウド トクセイ オヨビ カンシツ クリカエシ シケン ニ オケル タイキュウセイ ニ カンスル ジッケンテキ ケンキュウ

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Abstract

We have already developed the new recycling system for high-water content mud by using paper debris and powder polymer. The modified soils produced by this method have several features such as high failure strength, high failure strain and high durability for drying and wetting. These features are due to the existence of the fibers in the modified soils.<BR>By the way, the amount of paper debris which is necessary in this method depends on the water content, and if the water content is very high, a huge amount of paper debris is necessary to modify the high water content mud. As the cost of paper debris is strongly affected by the fluctuation of the market price, the stabilization and reduction of the processing cost will be possible if the amount of paper debris is reduced. Therefore, in this study, the possibility to use the paper sludge which is discharged in the recycling process of used paper as a substitute for paper debris was investigated.<BR>It was confirmed through the drying and wetting tests that paper sludge can be used as a substitute for paper debris because the modified soils by use of paper sludge showed high durability for drying and wetting. However, the strength of the modified soils by use of paper sludge was not high enough. Therefore, the modified soils by use of paper sludge and paper debris were made, and the strength property of them was examined. In results, when the paper debris of 30kg/m3 was added in the high water content mud, enough strength was obtained. This addition rate of paper debris was approximately half of the one in the previous method without using the paper sludge. Furthermore, it was found that powder polymer and chemical flocculants do not affect the durability and strength of the modified soils. Therefore, it was confirmed that about 75% cost reduction is possible if the paper sludge is used and powder polymer and chemical flocculants are not used.

Journal

  • Shigen-to-Sozai

    Shigen-to-Sozai 122 (6/7), 353-361, 2006

    The Mining and Materials Processing Institute of Japan

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