Rave reviews for Geosynthetics 2013

June 1st, 2013

By Andrew Aho By all accounts, the Geosynthetics 2013 conference in Long Beach April 1–4 was a rousing success—more technical papers, more attendees, and more exhibitors. GMA was excited to be a co-organizer of this conference working with staff members from the Industrial Fabrics Association International (IFAI) and especially with the conference chairs, Bob Holtz […]

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Retrospective of GRI-25’s retrospective conference

June 1st, 2013

Retrospective of GRI-25’s retrospective conference Retrospective of GRI-25’s retrospective conference By Bob Koerner, George Koerner, and Grace Hsuan On April 1–2, 2013, we held our GRI-25 conference in Long Beach, Calif., within the larger Geosynthetics 2013 conference, on the theme: “A 25-year retrospective on the geosynthetics industry and glimpses into the future.” By all accounts […]

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Marine works, geotextile characteristics

June 1st, 2013

From the GMA Techline RE: Marine works, geotextile characteristics I want to know your point of view concerning the selection of the correct geotextile as a separation layer below a submerged reef. The submerged reef section … includes a 2–3 ton double layer laid directly on a geotextile, without insertion of sublayer, because they wanted […]

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Finding GRI-GG2

June 1st, 2013

From the GMA Techline RE: GRI-GG2 A question from Germany We are searching for the actual version of GRI-GG2. My latest version is from 2000. What is the newest version? Where can I get it? With kind regards. Reply: Our latest revision of GRI-GG2 on geogrid junction strength is Revision 3—Aug. 1, 2005. We will […]

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ASTM standards for silt barrier fence

June 1st, 2013

From the GMA Techline RE: Silt barrier fence I have a problem that could not be resolved by the only “approved” fabric manufacturer. I am turning to you in desperation. Our specifications calls for a silt fence with “a maximum slurry flow rate of 0.3 GPM/Sq. Ft.” I have seen this requirement being specified by […]

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Critter control and membrane repair

June 1st, 2013

From the GMA Techline RE: Critter control Have you ever heard of an instance where critters (groundhogs, for instance) dug through a geomembrane cap? [We have heard] stories about membrane repair in response to rats and groundhogs. The rats were trapped in a lined floodwall berm. The groundhogs are more disturbing. We have those everywhere. […]

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Leakage rates for pond liners

June 1st, 2013

GMA techline answers from Bob Koerner RE: Leakage rates for pond liners Do you have any data or know a source on typical ranges of leakage rates through geomembrane-only pond liners for raw water (nontoxic, nonwaste)? Thanks and best regards. (Gary | USA) Reply: We have exactly what you are looking for (at least I […]

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Passing peel separation, 4 out of 5?

June 1st, 2013

From the GMA Techline RE: 4 out of 5? A question about the Table 1(a) of GM19, page 9 of 13. Regarding passing peel separation %—do 4 out of the 5 specimens have to pass the 25% or less requirement? Or is that only for the strength criteria? (Sam | Maryland) Reply: In all honesty […]

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Geogrid lateral load?

June 1st, 2013

From the GMA Techline RE: Geogrid lateral load? I have proposed a GRS wall to replace a cut fill failure. Our geotechnical division says it will not hold the lateral load of the surcharge of a car or truck. It will be 6 feet deep, 8 feet wide, and 90 feet long. We will excavate […]

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How tubular drainage geocomposite was used in landfill final cover

June 1st, 2013

A first for landfills in the southeastern United States. By Thomas B. Maier, P.E., and Stéphane Fourmont Introduction In landfill final cover systems, geocomposite drainage products are frequently used as a drainage layer above the geomembrane layer and for surficial landfill gas collection, either in strips or as a continuous layer, below the geomembrane. For […]

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