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The GMA Techline
October 1st, 2018
Toxicity of nonwovens? Q: Are there any comprehensive tests (or a general synopsis) of the environmental toxicity of leachate from nonwoven polypropylene fabrics when aged in a freshwater or saltwater solution? Regulatory and municipal bodies in Europe and New Zealand are requesting more info about products that are used in riparian and coastal environments. A: […]
Dr. Robert M. Koerner answers your geosynthetics questions
June 5th, 2018
Get your technical geosynthetics questions answered by one of the world’s leading experts on geosynthetics through the GMA Techline. View past questions and answers at https://tinyurl.com/GMATechline. Email gmatechline@ifai.com anytime for fast, direct answers to any and all technical geosynthetics questions. This one-of-a-kind resource is free to all courtesy of the Geosynthetic Materials Association (GMA), Geosynthetics magazine and the […]
Your geo technical questions answered on the GMA Techline
March 1st, 2018
Looking for answers to your geosynthetics technical questions? Contact the Geosynthetics Materials Association (GMA) Techline for thorough answers to the most detailed questions. Everything from measuring puncture resistance to the chemical effects of fracking flowback on HDPE geomembranes has been addressed by the GMA Techline. Dr. Robert M. Koerner and Dr. George Koerner of the […]
GMA Techline
October 1st, 2017
Welding HDPE to PVC and more Q: I would appreciate any input you have on these questions: Can a high-density polyethylene (HDPE) geomembrane (GM) be welded to a PVC geomembrane? I am looking to connect a geomembrane to a building foundation. Based on some research, I have found the following options: bolt the geomembrane to […]
GMA Techline
August 1st, 2017
Liner repair? Pullout tests? Sewn seams? Shear strength of sludges? Geomembrane liner repair Q: I have a facility that has submitted liner repair documentation for the repair of a high-density polyethylene (HDPE) liner for a leachate/stormwater pond at an industrial landfill site. The repairs were performed using either a patch or, for indentations and small […]
Your geo questions answered on the GMA Techline
June 7th, 2017
Looking for answers to your geosynthetics technical questions? Contact the Geosynthetics Materials Association (GMA) Techline for thorough answers to the most detailed questions. Dr. Robert M. Koerner, who has more than 40 years of experience teaching, writing about, researching, and consulting on geosynthetics, responds to questions that range from which geosynthetic to use for a […]
Questions and answers from the GMA Techline
February 1st, 2017
Spraying? Shear Strength? Hydraulics? [A more] non-permeable GT? Q: I have received an inquiry for a non-permeable geotextile, which is UV-resistant and will be installed on a long slope for erosion control. Could you kindly recommend a product that would meet these requirements or a solution for this application? Your assistance with this is much […]
Questions and answers from the GMA Techline
August 1st, 2016
Geosynthetic filter failure Q: I am interested in your upcoming webinar on geosynthetic filters and was hoping to get a little clarification on the content. I’m most interested in how geotextile fabrics are used with riprap but I also understand these fabrics are perhaps more commonly associated with roadway construction. How much does this webinar […]
Geocomposite drainage layers
October 1st, 2015
Flammability? Zip ties? MARV? Ponds? GT specs? Questions and answers from the GMA Techline. I wonder about your opinion on the use of a triplanar geocomposite for landfill drainage layer. We have not approved these in our jurisdiction to date. I have a current application where this is proposed to be used (vertical expansion). I […]
Saturated soil cover on liner question
October 1st, 2015
Questions and answers from the GMA Techline. I need your advice on a reservoir we are designing. It is an irrigation reservoir with a 40-mil HDPE geomembrane liner on a 3:1 slope. The client wants to cover the liner with 1ft of silt loam soil. The water elevation in the reservoir will fluctuate about 15ft […]