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PFAS and Geomembrane Lifespan
April 1, 2025 | Letters to the Editor
This letter concerns the effect of PFAS-type chemicals (1) to the lifespan of polyethylene geomembranes and the potential for a reduction in lifespan from PFAS exposure. While there is great benefit from academic journals and publications, there is, on occasion, benefit to be had from industrial exp…
Geotechnical Frontiers 2025 crosses finish line in Derby City
April 1, 2025 | Geotechnical Frontiers Watch
Louisville, Ky., was home to the four-day Geotechnical Frontiers March 2-5, 2025, at the Kentucky International Convention Center. The conference featured more than 200 exhibits displaying the latest in products, services and technologies for geotechnical and geosynthetic industries to share develop…
Geomembrane Insulation Design
April 1, 2025 | Q&A: GMA Techline
Q: We have a project where the client has requested us to design a soil cover to protect an HDPE liner from melting due to campfires. The locals like to hang out on the summit of this superfund site and have cookouts, and the privately owned site will not be secured after the 30-year post closure is…
Geomembrane Seam Sample Testing
April 1, 2025 | Q&A: GMA Techline
Q: We occasionally receive geomembrane seam samples for testing where LLDPE is welded to HDPE. In this situation, should these samples be tested at 50mm/min. or 500mm/min.? To further complicate this, sometimes these seams are extrusion welds using either HD or LL rod. Does this influence the select…
Carbon Black
April 1, 2025 | Q&A: GMA Techline
Q: What is the purpose of “good” carbon black in a geomembrane formulation?
ASTM D5397 Clarification
April 1, 2025 | Q&A: GMA Techline
Q: I need some clarification regarding ASTM D5397. One of our baths is having an issue with the agitator. Does it impact the testing if the solution is not agitated continuously?
Geomembrane Installation Risks
April 1, 2025 | Q&A: GMA Techline
Q: Could you please let me know if there is any information available on risks associated with installing a geomembrane? Our CQA inspector is pressing us for this because the owner is doing a risk assessment of the geosynthetic installation process.
GCL Overlaying
April 1, 2025 | Q&A: GMA Techline
Q: Can you provide information about overlaying a new GCL on hydrated and damaged GCL?
Trends in geosynthetics
April 1, 2025 | Features
All types of geosynthetics are experiencing heightened interest from a spectrum of industries that are seeking out and using these solutions. This is happening mainly in response to environmental pressures but also due to increased infrastructure activity that has sharpened the need for geogrids, ge…