Hydraulic conductivity of non prehydrated geosynthetic clay liners to acids

Yang Liu, A. Bouazza, W. P. Gates

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

Geosynthetic clay liners (GCLs) are widely used in landfill and other engineering projects as waterproof materials due to their low hydraulic conductivity when in contact with water. However, GCLs are now often expected to contain mining liquids with low pH, and an assessment of GCL performance to acidic liquids is required. The hydraulic conductivity of a commercial Australian geosynthetic clay liner has been evaluated under various effective pressures and concentrations of sulfuric acid solutions. In our study, we modified the traditional flexible wall testing equipment by installing pH and EC sensors in the influent and effluent lines to determine automatically the in/out-flow pH/EC values and therefore assess chemical equilibrium in real time. All the values are compared with the values obtained with water as permeant. The results show that the hydraulic conductivity values increased significantly with the increasing concentrations of acid solutions, the elevated effective stress improved the hydraulic performance of GCLs. All the chemical compatibility tests were conducted on non-prehydrated GCLs.

Original languageEnglish
Title of host publicationGeosynthetics Asia 2012: Proceedings of the 5th Asian Regional Conference on Geosynthetics - Geosynthetics for Sustainable Adaptation to Climate
Subtitle of host publication13-16 December 2012; Bangkok, Thailand
Editors Dennes T. Bergado
Place of PublicationBangkok, Thailand
PublisherInternational Geosynthetics Society
Pages1059-1065
Number of pages7
Publication statusPublished - 2012
EventAsian Regional Conference on Geosynthetics 2012 - Bangkok, Thailand
Duration: 13 Dec 201216 Dec 2012

Conference

ConferenceAsian Regional Conference on Geosynthetics 2012
CountryThailand
CityBangkok
Period13/12/1216/12/12

Keywords

  • Acid conditions
  • Geosynthetic clay liners
  • Hydraulic conductivity

Cite this

Liu, Y., Bouazza, A., & Gates, W. P. (2012). Hydraulic conductivity of non prehydrated geosynthetic clay liners to acids. In D. T. Bergado (Ed.), Geosynthetics Asia 2012: Proceedings of the 5th Asian Regional Conference on Geosynthetics - Geosynthetics for Sustainable Adaptation to Climate : 13-16 December 2012; Bangkok, Thailand (pp. 1059-1065). International Geosynthetics Society.