Hydraulic conductivities and effective diffusion coefficients of geosynthetic clay liners with organobentonite amendments

R. J. Lorenzetti, S. L. Bartelt-Hunt, S. E. Burns, J. A. Smith

Research output: Contribution to journalConference article

1 Scopus citations

Abstract

Laboratory diffusion and permeability tests were performed on GCLs amended with two different types of organobentonites: benzyltriethylammonium-bentonite (BTEA-bentonite) and hexadecyltrimethylammonium-bentonite (HDTMA-bentonite) and compared to results for a GCL constructed with conventional sodium bentonite. Results from the hydraulic conductivity testing indicate the addition of both types of organobentonite results in an increase in hydraulic conductivity. Only a small increase (less than one order of magnitude) in hydraulic conductivity was observed for both types of GCLs amended with up to 20% organobentonite. At higher organobentonite contents, measured hydraulic conductivity for both types of amended GCLs increased by as much as three orders of magnitude. The effective diffusion coefficient measured for both the organobentonite-amended GCLs and the laboratory-constructed sodium bentonite GCLs were similar and ranged from 2.67 × 10 -10 to 4.17 × 10 -10 m 2/sec. Considering the strong sorption capacity of organobentonites for organic contaminants, these results suggest that the ability of GCLs to retard the transport of organic contaminants can be improved by substituting 10-20% of the conventional bentonite with an organobentonite.

Original languageEnglish (US)
Pages (from-to)3221-3231
Number of pages11
JournalGeotechnical Special Publication
Issue number130-142
StatePublished - 2005
EventGeo-Frontiers 2005 - Austin, TX, United States
Duration: Jan 24 2005Jan 26 2005

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

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