GSI’s annual Landreth “Steward of the Environment” award

October 1, 2022  |  GSI News

The Robert and Mitchell Landreth “Steward of the Environment” award was established in 2021. It is in honor of Robert Landreth (1939–2021) and his wife, Mitchell. The annual award is bestowed by the Geosynthetic Institute (GSI) in recognition of “distinguished engineering achievement related…
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GSI Webinar – Applications and Design of Geotextile Tubes – September 7

August 25, 2022  |  GSI News, News, Webinars

The Geosynthetic Institute (GSI) will sponsor a webinar, “Applications and Design of Geotextile Tubes,” on September 7, from 11:30 a.m. to 1 p.m. EDT. Geosynthetic Materials Association (GMA) member companies and their employees receive discounted rates on all GSI webinar and…
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An open solicitation to work on development of a new GSI specification for EIA geomembrane

August 1, 2022  |  GSI News

GSI has a long history of writing specifications for geosynthetics. Like all engineered materials, geosynthetics are used in many applications and need general requirements for plans and specifications. When the NSF ceased servicing NSF #54 “Specification for Geomembranes” in 1991, The Geosynthe…
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New GSI test method for resistance of conductive geosynthetics

June 1, 2022  |  GSI News

The Geosynthetic Institute (GSI) has a new test method for resistance measured across positions on conductive geosynthetics. Conductive geosynthetics contain an electrically charged backing (usually a thin layer of polyolefin with letdowns containing 20%–30% carbon black) that allows leaks to be d…
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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 …
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Reinforced levees to induce seepage path around geogrid layers?

February 1, 2022  |  GSI News, News

The Geosynthetic Institute (GSI) has been asked if a geogrid-reinforced levee will induce a seepage path adjacent to and around the geosynthetic layers. This question has been asked on several occasions for different applications and various styles of geogrids. At this point, GSI has no case histori…
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New anchorage and connection strength tests for geosynthetics

October 1, 2021  |  GSI News, News

Connections can have a significant impact on the performance of exposed geosynthetic systems. The connection must be considered as a limiting strength factor and evaluated by the same performance standards as the material alone. If used in critical structures with design lives of more than 30 years,…
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GSI’s new GCL test method

August 1, 2021  |  GSI News, News

The Geosynthetic Institute (GSI) has a new standard test method for “Determination of the Polymer Loading in Geosynthetic Clay Liners (GCLs).” It was developed over several years without consensus of the membership. GSI forged ahead with it because we see many such products in the market and bel…
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An open solicitation to join in a round-robin effort to find a substitute for Igepal CO-630

June 1, 2021  |  GSI News

Improved stress-cracking resistance in high-density polyethylene (HDPE) geomembranes has been a quest of our industry and a hot research topic for years. The Geosynthetic Institute (GSI) has been working in this area since the mid-1980s.
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A new specification for geotextile grout filled mattresses

April 1, 2021  |  GSI News

By George R. Koerner Geotextile grout filled mattresses (GGFM), also referred to (in ASTM D18.25/D35.05) as fabric-formed concrete (FFC) or fabric-formed concrete revetments (FFCR), are erosion-resistant concrete linings made from durable, permeable fabric forms that are filled with high-strength gr…
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