• Proceedings of the Korean Geotechical Society Conference
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• 2010.03a
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• pp.1104-1113
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• 2010

In order to reduce negative skin friction uses bitumen most plentifully. But, Bitumen is expensive very of 1.5 or more times of pile material expense. The bitumen will be able to substitute it is nescessary. It was researched that it would be able to bitumen substitutions from in products which is produced from domestic in this study. This was composed with most bentonite, added some cement. When it is used this product in the model test, the reduction ratio appear of 85% or more. In this result, this product as the reduction material is confirmed that has enough ability. Additional research leads, the product according to pile construction method must verify the reduction effect of negativ skin friction in field test.