Effects of adding anionic polymer to GCLs treated with chemical solutions
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In this study, triaxial permeability and free swell tests were performed on anionic polymer-added GCLs treated with MgCl2 and KCl solutions that represented leachates collected in waste containment areas. The GCL was composed of a granular sodium bentonite placed between a woven and a nonwoven geotextile without reinforcement. The bentonite contained 0.5%, 1% and 2% anionic polymer by mass respectively. The permeant fluid that was in contact with the GCLs was chosen as distilled water, 0.5 M MgCl2 and 0.5 M KCl solutions. Test results indicated that adding anionic polymer to GCLs generally improved hydraulic properties of the GCLs in terms of permittivity and swell index. Although adding anionic polymer up to 1% amount by mass caused a significant decrease in permittivity of the GCLs permeated with all of the permeant fluids, permittivity of 2% anionic polymer-added GCL was measured as almost the same as that of 1% anionic polymer-added GCL when the GCLs were treated with either 0.5 M MgCl2 or 0.5 M KCl solutions. © 2017 19th ICSMGE Secretariat. All rights reserved.