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Effect of Waste Bamboo Fiber Addition on Mechanical Properties of Soil

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Document pages: 12 pages

Abstract: For soilimprovement, a method using plant fiber has been used since ancient times. Inrecent years, the constructionmethod using plant fiber has attracted attention as a ground improvementtechnology with less environmental load. In this work, the soil improvement effect using waste bamboo fiber wasexperimentally examined. The liquid limit and plastic limit of the mixed soiltended to increase with increasing bamboo fiber content and there was no changein the plasticity index of the mixed soil by the difference of bamboo fibercontent. As a result from the compaction test and unconfined compressiontest, it was revealed that mixing of bamboo fiber resulted in a reduction of soil material required for construction and increasing in strength.The maximum compressive stress of the bamboo fiber mixed soil at the mixingratio of 0 , 1 , 3 and 5 were 115, 108,130 and 152 kN m2, respectively. As the soil with fiber showed thelower stiffness and higher strength than that without fiber in the dry region, it can bejudged that the addition of fiber brought ductility to the soil. And it wasfound that the decrease in the stiffness of the specimen due to the increase ofwater content was suppressed by the addition of the bamboo fiber. From theresults of the observation with the digital microscope, it was observed thatthe two-layer structure consisting of the main relatively thick fibrousstructure and the secondary capillary fibrous structure were formed. Thus, it was found that the complex structure of the bamboofiber is deeply involved in the strength of the mixed soil.

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