Stress-Cracking Resistance of a Bi-modal PE-RT HDPE Geomembrane
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Rohit Sati, M.Sc, Layfield Group, 17720 – 129 Avenue NW, Edmonton, Alberta, Canada; e-mail: firstname.lastname@example.org
David Beaumier, Eng., M.Sc.A., CTT Group Sageos, 3000, avenue Boullé, St-Hyacinthe, Quebec, Canada; email@example.com
Abstract : Stress crack resistance (SCR) of high-density polyethylene (HDPE) geomembranes, with densities higher than 0.94 g/cc, has been widely researched and documented. Over the years, PE resin technology has evolved and has helped to improve many long-term performance properties including SCR. In this study, resistance to stress-cracking of bi-modal polyethylene raised temperature (PE-RT) HDPE was assessed and compared to HDPE and LLDPE geomembranes over a load range from 28 to 60% of yield stress. The higher tensile resistance of this specific bimodal resin resulted in higher resistance in the ductile failure mode than standard HDPE, but moreover, its stress-cracking resistance behavior was found without any clear transition of the failure envelope from a ductile to a brittle behavior. This observation suggests a longer projected lifespan of this unique bi-modal PE compared to existing geomembranes developed using unimodal resins. Previous studies on this material have analyzed tensile, antioxidant depletion, and resistance to brine and chlorine at elevated temperatures. In all cases, an improvement in durability was demonstrated. This study on stress cracking provides a comprehensive understanding of all known key mechanisms contributing to bi-modal PE geomembrane durability.
Presented at Geosynthetics Conference 2021, Industrial Fabric Association International (IFAI)