Index tests for geosynthetic clay liners containing bentonite–polymer composites

Geng, Weijuan; Salihoglu, Hulya; Likos, William J.; Benson, Craig H.

doi:10.1680/jenge.22.00072

Index tests for geosynthetic clay liners containing bentonite–polymer composites

Journal Article · 30 September 2022 · Environmental Geotechnics

DOI:https://doi.org/10.1680/jenge.22.00072· OSTI ID:1981019

Geng, Weijuan ^[1]; Salihoglu, Hulya ^[2]; Likos, William J. ^[3]; Benson, Craig H. ^[4]

Department of Civil Engineering, Jiangsu University, Zhenjiang, China
Golder Associates, Lakewood, CO, USA
Department of Civil and Environmental Engineering, University of Wisconsin–Madison, Madison, WI, USA
Geological Engineering, University of Wisconsin–Madison, Madison, WI, USA

The hydraulic conductivity of geosynthetic clay liners (GCLs) containing bentonite–polymer composites (BPCs) is controlled by a pore clogging mechanism related to the swelling of sodium bentonite (NaB) granules and formation of polymer gel in the pore space. Three index testing procedures that are influenced by bentonite swelling and rheology of the polymer gel were evaluated in this study for screening BPC GCLs for hydraulic conductivity: viscosity, liquid limit by fall-cone penetration and active water content. Experiments were conducted using polyacrylamide (PAM) polymer, dry-blended mixtures of PAM and NaB and a BPC from a commercially available GCL. These materials were contacted with inorganic solutions representing leachates from a range of waste containment scenarios. For the BPC that was evaluated, hydraulic conductivities less than 10^-10 m/s were obtained when the viscosity exceeded 220 mPa s and the active water content exceeded 300%. Hydraulic conductivities less than 10^-11 m/s were achieved for viscosity exceeding 350 mPa s, fall-cone liquid limit exceeding 190 and active water content exceeding 300%. Additional testing is needed to assess the generality of these index tests and the identified thresholds when applied to other BPC GCLs and other permeant liquids.

Research Organization:: Vanderbilt Univ., Nashville, TN (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: FC01-06EW07053

OSTI ID:: 1981019

Journal Information:: Environmental Geotechnics, Journal Name: Environmental Geotechnics; ISSN 2051-803X

Publisher:: Institution of Civil Engineers

Country of Publication:: United States

Language:: English

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