DURABILITY AND CHARACTERISTICS ON SEAM OF GAS-PERMEABLE/WATERPROOF SHEET FOR LANDFILL CAP COVER

Abstract

Landfill cap cover that simultaneously suppresses water infiltration to the waste and promotes rapid gas permeation is demanded. We have developed gas-permeable/waterproof sheet (GPWS), comprising a micro-porous sheet which is waterproof but have gas permeability, coated with nonwovens to protect it, and investigated characteristics and applicability of GPWS as a landfill cap cover. In this study, durability and characteristics on seam of GPWS were evaluated. Results showed that waterproof, gas permeability, and tensile properties of GPWS, which has been laid in test slope for 3 years, remained their original level. In addition, it was demonstrated that water impermeability in seam of GPWS can be achieved under 100 cm hydraulic head.