ENVIRONMENTAL STRESS CRACK RESISTANCE OF GEOMEMBRANE BY NCTL TEST

초록

The effects of acidic and alkaline solutions from wastes leachate on the machine properties of a 2.5 mm thick high density polyethylene (HDPE) geomembranes (GMs) were examined. Smooth/textured HDPE GM specimens were cut into machine direction (MD) and cross machine direction (CMD) which were immersed in the tanks of notched constant tensile load (NCTL) test apparatus containing acidic water (pH=4), alkaline water (pH= 8) and incubated at 40 and 60 °C respectively. The decline in stress crack resistance of HPDE GMs is evaluated using NCTL tester. In acidic and alkaline conditions, HDPE GMs performed the same stress crack resistance. The increase in temperature and the level of loading shows the decrease in stress crack resistance.