Geotechnical Characterization of Permeable Barriers mixture of Sand, Loess and Bentonite

This study is part of the project that develops the permeable barrier to be applied in a landfill. The permeable barrier is different from an impermeable barrier in that it permits a limited diffusion of the leachate, which will be directly purified biologically and chemically in the landfill. This study determines the optimum mixing ratio between sand, loess, and bentonite, which are the main components of the permeable barrier. Dry specimens were made using a mixture of sand, loess and bentonite. Uniaxial compression test and permeability test were conducted to measure optimum mixing ratio. As a result, the optimum-mixing ratio that satisfied the regulation of unconfined compressive strength(490kPa) and coefficient of permeability(10⁻³~10⁻⁴ cm/sec) of the landfill was when the ratio of sand and loess was 8:2 with bentonite content of 2%.