Durability of Polyethylene Geopipes for Landfill Applications After Several Years in Service

Agustus 18, 2021 by admin in Uncategorized

Durability of polyethylene geopipes for landfill applications after several years in service

Helmut Zanzinger, Kurt Engelsing & Sebastian Hausmann SKZ – German Plastics Center, Würzburg, Germany

Geosynthetics (GSY) and geopipes (GPI) used for landfill applications should have a guaranteed service life of at least 100 years according to the up-to-date landfill directive in Germany. Bearing in mind the high permanent temperatures in landfills, GPIs and GSYs have to have an excellent long-term stability. Almost all GPIs installed in landfills are made of polyethylene (PE). The most common reasons for failure of polyolefins are oxidation, stress cracking and leaching. For this study, GPIs have been taken from three different landfill sites after up to 20 years in service at approximately 40 °C and tested in the laboratory. For comparison, two state-of-the-art PE-samples (PE80 and PE100) were tested too. A High Pressure Autoclave Test (HPAT) was used to determine thermo-oxidative and leaching behaviour. Stress crack resistance was determined by Full Notch Creep Test (FNCT) and Strain Hardening Method. The laboratory tests revealed that after only approx. a fifth of the required minimum service life of 100 years, material properties of some samples are by far worse than the requirements for new products. The test results show that a service life of at least 100 years can most likely not be fulfilled by many products, which however did meet the requirements for GPIs for landfill applications in state as delivered, described 20 years ago.

Article source : https://www.researchgate.net/publication/289577961_Durability_of_polyethylene_geopipes_for_landfill_applications_after_several_years_in_service
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