Abstract
Variation of tensile strength and elastic modulus of HDPE geomembrane with changes in circumstantial temperature were investigated. Two types of tests were conducted. One is laboratory tensile test, where temperature was varied from 0 to 60°C. Other is pull-out test in outdoors at temperature in the range 0 to 48°C. The data from pull-out tests were analyzed to determine the elastic modulus based on the theory of elasticity. As the results, it is founnd that tensile strength, σt, and secant modulus at 1% strain, Es1, obtained from tensile tests were related with tempetature t as formulas of σt=23.52-0.27t (MPa) and Es1=801.64·10-0.0125t(MPa), that elastic modulus estimated from pull-out tests varied also with temperature and its trend coincided with that determined from tensile tests, and that Co-energy corresponding to peak stress decreased with increase of temperature.
