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Raven adds smooth-edge technology to extruded geomembranes
February 8th, 2021
Raven now offers HydraLine in 23-foot (7-m) wide seamless, smooth-edge, textured mill rolls. Raven Industries Inc. announced that its Engineered Films division has incorporated new smooth-edge technology onto its seven-layer barrier extrusion line for the production of 23-foot (7-m) wide textured sheet geomembranes. The new smooth-edge extrusion process creates a high-quality smooth surface edge on […]
The GMA Techline
February 1st, 2021
Moderated by George R. Koerner BIOLOGICAL DEGRADATION OF PE AND PP Q: Can you please enlighten me on the biological degradation of polyolefin polyethylene (PE) and polypropylene (PP)? A: Within the various plant forms of biological life, i.e., bacteria, actinomycetes, fungi and algae, polymer degradation is essentially nonexistent due to high molecular weight of the common […]
Bituminous geomembranes (BGM) for ponds in mining
February 1st, 2021
By Natalie Daly and Bernard Breul FIGURE 1 RUSAL Alumina clarifier pond bituminous geomembrane (BGM) liner, Ireland Bitumen has emerged as a standard 20th-century waterproofing material in civil and water engineering in the form of bituminous concrete, asphalt and bituminous geomembranes. The first applications of bituminous geomembranes (BGM) were in France in 1975 near Grenoble […]
FGI to host webinar on geomembrane attachment and penetration design and installation
January 21st, 2021
The Fabricated Geomembrane Institute (FGI) will sponsor a webinar, “Geomembrane Attachment and Penetration Design and Installation,” on February 4, at 11 a.m. CST. The webinar is free to industry professional and students, and 1 PDH is available. The webinar will provide an overview of industry norms for sealing and attaching of geomembrane liners to pipe […]
FGI offers webinar on the Yeager Airport RSS failure
December 15th, 2020
The Fabricated Geomembrane Institute (FGI) will sponsor a webinar, “Yeager Airport RSS Failure: Forensic Limit Equilibrium and FLAC Analyses,” on Jan. 14, 2021, at Noon CST. The webinar is free to industry professionals and students, and 1.0 professional development hour (PDH) is available. This webinar will discuss the forensic limit equilibrium and continuum deformation analyses used […]
Environmental Protection Inc. shares tips on cold weather installation of geomembranes
December 10th, 2020
As the seasons change and temperatures shift, Environmental Protections Inc. (EPI) has put together some suggested installation methods during cold weather conditions. No surprise that location and climate may play a larger role than originally planned in the seasonal changes. With the goal to protect your project and material, the best way to do this […]
Testing wind-resistant geosynthetics
October 1st, 2020
By George R. Koerner As you can see by Figure 1, we are experiencing a new age of geosynthetics. Over the past 15 years, we have seen a propensity of polymeric materials left exposed to rather than covered from the environment. This is in large part due to the strides geosynthetic manufacturers and polymer formulators […]
Methods to estimate pressures and strains in pond geomembrane bubbles
August 1st, 2020
By Richard Thiel, Hesham Eldesouky and Richard Brachman FIGURE 1 Bubbles in pond with 60-mil (1.5-mm) HDPE geomembrane on verge of bursting This article provides an update, validation and improved approach for predicting the shape, pressure and strains that can occur in an exposed geomembrane bubble (aka “whale”) created by gas trapped below the geomembrane […]
The GMA Techline
August 1st, 2020
Seaming dissimilar geomembranes Q: I kindly request your technical support in the questions below: A nonpolyethylene geomembrane was used in phase 1 of the tailings dam waterproofing system of a gold mine. For the expansion (phase 2), the use of a high-density polyethylene (HDPE) geomembrane is being evaluated. How can the HDPE geomembrane join the bituminous […]
Assessment of condition of an uncovered geosynthetic landfill bottom liner system
June 1st, 2020
By James L. Hanson and Nazlı Yeşiller Composite liner systems consisting of geomembranes (GMs) placed over geosynthetic clay liners (GCLs) commonly are used for containment applications. Such systems are used in base liners for ponds, reservoirs, basins and canals, and bottom and cover liner systems for landfill facilities. Even though the use of GCL-GM composites […]