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Impact of High Concentration Solutions on Hydraulic Properties of Geosynthetic Clay Liner Materials
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
* Author to whom correspondence should be addressed.
Received: 21 August 2012; in revised form: 12 October 2012 / Accepted: 7 November 2012 / Published: 14 November 2012
Abstract: This study focuses on the impact of landfill high concentration solutions erosion on geosynthetic clay liner (GCL) materials permeability. The permeation tests on the GCL, submerged using different kinds of solutions with different concentrations, were carried out systematically by taking these chemical solutions as permeant liquids. Based on seasonal variations of ion concentrations in Chenjiachong landfill leachate (Wuhan Province), CaCl2, MgCl2, NaCl, and KCl were selected as chemical attack solutions to carry out experimental investigations under three concentrations (50 mM, 100 mM, 200 mM) and soak times (5, 10, and 20 days). The variation law of the GCL hydraulic conductivity under different operating conditions was analyzed. The relationship between GCL hydraulic conductivity, chemical solutions categories, concentrations, and soak times were further discussed. The GCL hydraulic conductivity, when soaked and permeated with high concentration chemical solutions, increases several times or exceeds two orders of magnitude, as compared with the permeation test under normal conditions that used water as the permeant liquid. This reveals that GCL is very susceptible to chemical attack. For four chemical solutions, the chemical attack effect on GCL hydraulic conductivity is CaCl2 > MgCl2 > KCl > NaCl. The impact of soak times on GCL hydraulic conductivity is the cooperative contribution of the liner chemical attack reaction and hydration swelling. A longer soak time results in a more advantageous hydration swelling effect. The chemical attack reaction restrains the hydration swelling of the GCL. Moreover, the GCL hydraulic conductivity exponentially decreases with the increased amplitude of thickness.
Keywords: geosynthetic clay liner materials; high concentration chemical solutions; chemical attack effect; hydraulic conductivity; hydration swelling
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MDPI and ACS Style
Xue, Q.; Zhang, Q.; Liu, L. Impact of High Concentration Solutions on Hydraulic Properties of Geosynthetic Clay Liner Materials. Materials 2012, 5, 2326-2341.
Xue Q, Zhang Q, Liu L. Impact of High Concentration Solutions on Hydraulic Properties of Geosynthetic Clay Liner Materials. Materials. 2012; 5(11):2326-2341.
Xue, Qiang; Zhang, Qian; Liu, Lei. 2012. "Impact of High Concentration Solutions on Hydraulic Properties of Geosynthetic Clay Liner Materials." Materials 5, no. 11: 2326-2341.