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http://dx.doi.org/10.12814/jkgss.2019.18.4.063

Applicability of Recycled Soil Mixed with Bentonite-Polymer for Waste Landfill Liner  

Shin, Eun Chul (Dept. of Civil and Environmental Engineering, College of Urban Science, Incheon National Univ.)
Lee, Hee Mun (Dept. of Civil and Environmental Engineering, College of Urban Science, Incheon National Univ.)
Publication Information
Journal of the Korean Geosynthetics Society / v.18, no.4, 2019 , pp. 63-73 More about this Journal
Abstract
In this study, it was studied recycled soils with bentonite-polymer mixture in order to design economic landfill instead of clay liner. Recycled soil was used as SP, a sandy soil with 90.58% sand and 1.88% silt and clay. The recycled soils were mixed with 4%, 6%, and 8% bentonite by weight, and then compared with samples mixed with 2%, 3%, and 4% bentonite by weight in marine clay. Recycled soil satisfied the permeability criteria at 8%, and clay soil satisfied at 3%. In order to make a sample that satisfies the standard of the waste landfill, a permeability test was conducted by mixing 0.16%, 0.24%, and 0.28% of the polymer in a sample having 4% bentonite mixing ratio. The unconfined compression strength test was carried out at the same mixing ratio to confirm that the specification was satisfied. As the bentonite mixture ratio increased, the permeability coefficient and unconfined compression strength decreased. The strength in polymer mixing increased initially and then maintained a constant value. At 4% bentonite mixing ratio and 0.28% polymer mixing ratio, the coefficient of permeability was 1.0×10-7 cm/sec or less, and the unconfined compression strength was over 500 kPa. It was confirmed that it can be used as a mixed liner material of waste landfills.
Keywords
Recycled soil; Bentonite; Polymer; Clay liner; Permeability; Unconfined compression strength;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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