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Polypropylene vs. polyester
June 1st, 2012
From the GMA Techline RE: Polypropylene vs. polyester? I was hoping you may be able to provide some guidance regarding the material use of geotextile cushion within landfills. The manufacturer has suggested that their geotextiles are polyester, however we typically nominate a nonwoven, needlepunched, polypropylene geotextile. (Alaa | Australia) Reply: From the very beginning of geotextiles, […]
High-temp resilient liner
June 1st, 2012
From the GMA Techline RE: High-temp resilient liner Can you please guide me to suppliers of high-temp, approx. 215 F (100 C) liners? Also, the liner should be able to handle up to 200,000ppm TDS (total dissolved solids) of salts. I am looking for HDPE or similar liner. (Mukesh | Australia) Reply: Wow, what a […]
Question about AOS
June 1st, 2012
From the GMA Techline RE: Question about AOS Can you help telling me how to calculate the apparent opening size (AOS) of a nonwoven geotextile if I have permittivity, permeability, flow rate, and thickness? Is it possible to do? (Jorge | Mexico) Reply: What a great question but, unfortunately, the answer is “No.” The reason […]
GCL and HDPE questions
June 1st, 2012
From the GMA Techline RE: Two questions Does a geosynthetic clay liner (GCL) form whales from gas or water pressure, the same way as with a flexible membrane liner (FML), or does gas or water under pressure pass upward through a GCL? When a high-density polyethylene (HDPE) pipe crushes—say, due to lack of bedding when […]
MSW landfill cap anchor trench design
June 1st, 2012
From the GMA Techline RE: MSW landfill cap anchor trench design I have been asked by a project manager with my company to design an anchor trench for a municipal solid-waste (MSW) landfill that is being capped using a 40-mil LLDPE (linear low-density polyethylene) geomembrane. Having read through Designing with Geomembranes 5th edition, I was […]
Do floc characteristics influence geotextile tube dewatering performance?
June 1st, 2012
By Brett W. Maurer and Shobha K. Bhatia Introduction Geotextile tubes have been successfully used by numerous industries to dewater a variety of high-water-content slurries and waste materials. Concurrent with the expanding use of geotextile tubes, the desire to reduce effluent turbidity and improve the speed of dewatering has led to the established use of […]
All about Geosynthetics 2013
June 1st, 2012
Geosynthetics 2013 is co-locating with the Southwest Geotechnical Engineers Conference and will also feature the Geosynthetic Research Institute’s GRI-25 Conference. About the Southwest Geotechnical Engineers Conference The Southwest Geotechnical Engineers Conference is one of the Federal Highway Administration’s (FHWA) most successful geotechnical technology transfer activities. State departments of transportation (DOT) and FHWA personnel who participate […]
GMA Lobby Day 2012
June 1st, 2012
By Andrew Aho Twenty companies and organizations participated in GMA’s annual Lobby Day April 16–17. The GMA lobbying team scheduled 25 meetings with congressional offices, including five meetings with U.S. senators, nine meetings with U.S. representatives, and the balance with senior policy and legislative staff members. By all measures, it was our most effective and […]
The GMA Techline and its 4th set of 500 Q’s & A’s
June 1st, 2012
By Bob and George Koerner Introduction The Geosynthetic Materials Association’s (GMA) Techline was initiated Sept. 1, 2004, as a free worldwide service to answer questions involving the many aspects of geosynthetic materials. From the outset there were no constraints placed on the questioner or their questions. GMA contracted with the Geosynthetic Institute (GSI) for answers […]
Hello, Mr. President?
June 1st, 2012
Seventh-grader Tayla Silva, daughter of Engineered Polymer Technologies vice president of sales and marketing, Ed Silva, was invited to “call the president” during the Geosynthetic Materials Association’s Lobby Day April 17. While GMA members and guests visited the Capitol Hill office of Rep. John Duncan (R-Tenn.), the congressman chatted with Tayla and then prompted her […]