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Japan has 210,000 earth-fill dams and many of them are located in the Hyogo prefecture. They have distinct zones of dissimilar material, a watertight clay core. The suitable soil materials of impermeable core zone are very important; nevertheless it is difficult for us to secure them near the dam site. It becomes expensive to reconstruct an old earth-fill dam, because the suitable soil materials have to be borrowed in from some distance. In addition, these earth-fill dams have large deposit of muddy soil in the reservoir. Such muddy soil reduced the volume of water kept in the reservoir and declined the quality of water. Though the muddy soil have to be removed, it is not easy to dispose it because of the high moisture content. In this paper, we proposed the using of the soil for impermeable core zone, using materials that should be recycled. It is necessary to be said that the material is not only low cost but also mechanically stable and environmentally friendly. Therefore, we made decision regarding the best mixture proportion based on the results of unconfined compression, and permeability tests.
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