ABSTRACT
After some introductory remarks regarding experimental techniques for the measurement of the hydraulic conductivity of GCLs, the fundamentals of the permeability behaviour of these products are discussed. The effects of freeze-thaw and wet-dry cycles are also evaluated. Further, the following influences on the hydraulic conductivity are considered: subgrade below and above the GCL, loadings upon the GCL and hydraulic gradient. Information is presented on the permeability for hydrocarbons and salt solutions.
