WATERPROOF CHARACTERISTICS OF GEOCOMPOSITE FOR LANDFILL CAP COVER UNDER TENSILE DEFORMATION

Abstract

Landfill cap cover that simultaneously suppresses water infiltration to the waste and promotes rapid gas permeation is demanded. We have developed geocomposites (GCs), comprising a micro-porous sheet which is waterproof but have gas permeability, coated with nonwovens to protect it, and investigated the characteristics of GCs as a landfill cap cover. In this study, waterproof characteristics of GC under tensile deformation were evaluated by examining the resistance to water penetration (RTWP) of GC after tensile deformations. Results showed that the RTWPs of GC remained unchanged even when tensile strain of GC in longitudinal direction, which was applied under restraining deformation in width direction, reached approximately 90% of that at breakage.