Geomembrane Residual Stress

June 1st, 2023

Q: We are getting a lot of uncertainty with our ASTM D5397 single-point notched constant tension load (SP-NCTL) stress crack testing. Can you shed some light on the situation? This uncertainty is frustrating our field personnel and holding up a rather large HDPE geomembrane liner installation for a massive landfill liner. A: You may be […]

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New GSI method for strain hardening of HDPE geomembranes

April 1st, 2022

Traditionally, high-density polyethylene (HDPE) geomembranes are checked for stress crack resistance using the ASTM D5397 single point-notched constant tensile load (SP-NCTL) test (Hsuan, Lord and Koerner [1990]). This test uses notched specimens, surfactant, and elevated temperatures to accelerate the behavior and force a brittle failure in HDPE geomembranes. With today’s high stress crack resistant HDPE […]

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Alternative stress cracking surfactants identified for HDPE geomembrane testing

February 9th, 2022

The Australian geosynthetics testing company ExcelPlas discusses the search for alternative stress cracking surfactants to the pollutant Igepal CO-630. Photograph courtesy Solmax Geosynthetics testing company ExcelPlas in Highett, Victoria, Australia, has identified two alternative stress cracking surfactants for high-density polyethylene (HDPE) geomembranes. Igepal™ CO-630, the non-ionic surfactant used in high-density polyethylene (HDPE) stress cracking bath, […]

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