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High pH effects geogrids?
April 1, 2022 | Q&A: GMA Techline
Q: Can you tell me whether the high pH of curing portland cement (typically ~12.4) might have any impact on the long-term performance of geogrids?
Geocells and geotextiles for separation/reinforcement at an oil-drilling platform
April 1, 2022 | Final Inspection
An Angle Energy Inc. oil drilling platform in northern Canada required year-round access for equipment to service and maintain a conventional wellsite pad. Several new wells were to be drilled on this pad, and since this location was not connected to a pipeline, continual heavy tanker truck traffic …
New GSI method for strain hardening of HDPE geomembranes
April 1, 2022 | GSI News
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 …
GMA returns to Washington
April 1, 2022 | GMA News
As the pandemic (hopefully) begins to wane in the United States, the Geosynthetic Materials Association (GMA) is optimistic that the reopening of Washington, D.C., and congressional offices to in-person meetings will come alongside spring weather. GMA returns to Washington for our twice-yearly Lobby…
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Ultralightweight foamed glass aggregate as MSE wall backfill
April 1, 2022 | Features
Mechanically stabilized earth (MSE) systems are a popular and economical option to construct retaining walls for highways and railways, wingwalls and abutments for bridges, and numerous other applications for public and private development. An MSE wall is comprised of alternating layers of fill and …
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Complex geosynthetic liner system for the 70 Ranch Raw Water Reservoir
April 1, 2022 | Features
Irrigation water in the western United States has always been a major concern for farming and ranching, especially in drought years. Water can be both scarce and expensive, and planning for future water storage and accessibility based on projected use is of paramount importance for irrigation distri…
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Geosynthetics and sustainability: How is our industry doing?
April 1, 2022 | Features
Sustainability is a complex issue, but there are some very simple and direct truths about it. The world’s population is nearly 8 billion people; while the population growth rate has slowed in recent years, the earth’s population continues to rise. There are simply not sufficient resources to pro…
Sand fines overlying geocomposite
April 1, 2022 | Q&A: GMA Techline
Q: We are working at a site with a permitted landfill cell with a leachate collection system that includes a drainage geocomposite with 12 inches (305 mm) of leachate collection sand overlying it. My question has to do with the percentage of fines in sand on a geocomposite. Our leachate collection p…
Scratch impact on HDPE liners
April 1, 2022 | Q&A: GMA Techline
Q: I have a project where multiple and extensive scratches were created on the high-density polyethylene (HDPE) liner for a reservoir due to poor construction practices. (See the following Figures 2–4.)
Methane gas geomembrane permeability
April 1, 2022 | Q&A: GMA Techline
Q: What is the least permeable geomembrane to methane gas? Regarding the permeability of geomembranes to methane gas, could you send me some technical guidelines?