Integrity of HDPE Geomembranes: Effect of Weather Exposure on the Mechanical Properties of Seams

Abstract

In landfills, the geomembrane is essential to minimize the migration of pollutants into the surrounding environment. However, the performance of the geomembrane in the long-term may be compromised by weather exposure. To address this issue, a study is underway involving geomembranes exposed to weather conditions for 10 years. Samples of HDPE geomembrane and seams are cut periodically over a 10-year period and tested to evaluate the physical, the mechanical, the endurance and the seam properties. This paper is focused on the long-term durability of geomembrane seams. The 10-year peel and shear test results are compared with the currently recommended GRI GM 19 Seam Specification, as well as with the unexposed seam properties and with the results obtained after 2, 3, or 5 years of exposure. Results have shown that the aged seams met the recommended specification and that they were not significantly affected by 10 years of weather exposure.