Sewn versus welded seams

February 1st, 2022

Q: On your GMA Techline website list of sample questions and answers, a question is asked about a recommendation for sewn versus welded seams for geotextiles. Bob Koerner answered this question by stating that you have done a study for joining geosynthetic clay liner (GCL) overlap seams via eight methods. Can you share that study […]

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Benefit/cost analysis as it relates to service life of geosynthetics

August 1st, 2020

On the surface, performing a benefit/cost (B/C) analysis is a straightforward process. However, ensuring that such an analysis is accurate and thorough is a much more nuanced task. In 2008, Bob Koerner laid out the procedure for geomembranes in Geosynthetic Research Institute (GRI) White Paper #12 “GS Selection Based on B/C Ratio.” This article expands […]

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The GMA Techline is 15 years old

February 1st, 2020

By Robert M. Koerner The GMA Techline was initiated on Sept. 1, 2004, as a free worldwide answer center for questions involving any, or all, aspects of geosynthetics. There were no constraints put on the questioners, or on the answers that were provided by the Geosynthetic Institute (GSI). To date, 3,500 Q and As have […]

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A dedicated man

February 1st, 2020

Erosion control and reinforcement are two applications that geosynthetics are used for. Distantly related, the two applications form the backbone of this publication. But looming large over this issue is the passing of Robert M. “Bob” Koerner and Pauline “Paula” W. Koerner, a couple who had a huge influence over the founding and development of […]

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In Memoriam: Robert M. Koerner

February 1st, 2020

The geosynthetics community is deeply saddened by the news of Robert M. and Pauline W. Koerner’s passing. The couple leaves a lasting legacy through their creation of the Geosynthetic Institute, their philanthropy, and their many accomplishments professionally and personally. Bob Koerner was a pioneer of geosynthetics, an influencer with a long record of geosynthetics achievements. […]

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Geosynthetics pioneer Robert M. Koerner and wife pass away

December 3rd, 2019

Robert M. Koerner and his wife Pauline W. Koerner have passed away. The Koerner family has released information on their passing to GSI Members. The notice to the Geosynthetic Institute (GSI) says, “It is with regret and heavy hearts that we announce the passing of Robert M. and Pauline W. Koerner. As you know Bob was […]

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GSI to host webinar on geosynthetic reinforced MSE walls

December 2nd, 2019

The Geosynthetic Institute (GSI) will sponsor a webinar, “Geosynthetic Reinforced MSE Walls; Overview, Failures and Items for Improvement” on Dec. 11, from 11:30 a.m. to 1 p.m. EST. Geosynthetic Materials Association (GMA) member companies and their employees receive discounted rates on all GSI webinar and short course registrations. Mechanically stabilized earth (MSE) walls represent a […]

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GSI to host webinar on soil consolidation using wick drains

November 13th, 2019

The Geosynthetic Institute (GSI) will sponsor a webinar, “Soil Consolidation Using Wick Drains, aka PVDs,” on Nov. 27, from 11:30 a.m. to 1 p.m. EST. Geosynthetic Materials Association (GMA) member companies and their employees receive discounted rates on all GSI webinar and short course registrations. Wick drains, also called prefabricated vertical drains or PVDs, consist […]

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GSI to host webinar on disposal of coal combustion residuals

October 30th, 2019

The Geosynthetic Institute (GSI) will sponsor a webinar, “Disposal of Coal Combustion Residuals,” on Nov. 13, from 11:30 a.m. to 1 p.m. EST. Geosynthetic Materials Association (GMA) member companies and their employees receive discounted rates on all GSI webinar and short course registrations. With coal representing more than 25% of energy sources, the disposal of […]

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GSI to host webinar on stability designs of landfill cover soils

October 15th, 2019

The Geosynthetic Institute (GSI) will sponsor a webinar, “Stability Designs of Landfill Cover Soils,” on Oct. 23, 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 short course registrations. This webinar focuses on the stability design of relatively thin soil […]

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