Abstract
Among various types of material used for geomembranes, HDPE (High Density Polyethylene) has relatively large thermal expansion rate and elastic modulus. Therefore, stress and strain caused by thermal expansion of HDPE geomembrane is relatively large and it is important to include its thermal dependency in design and installation works.
In the previous paper, the relational formula for the surface temperature of colored HDPE geomembrane was proposed using amount of insolation and air temperature. In this paper, the temperature dependency of white HDPE geomembrane is examined. While relation between amount of insolation and air temperature shows no correlation, relation between air temperature and surface temperature shows good correlation. Further, a comparison with the measured surface temperature and the calculated surface temperature using the formula shows that the measured surface temperature is about 10°C lower than the calculated surface temperature. These results indicate that the temperature dependency of white HDPE geomembrane is mainly affected by air temperature and the effect of insolation is restrained by its color.
