Landfill cooling

October 1, 2014  |  Q&A: GMA Techline

Geomembrane patching? Landfill cooling? Puncture protection? Geomembrane patching? Landfill cooling? Puncture protection? Questions and answers from the GMA Techline Landfill cooling? If the difference in temperature between wet waste and the ambient environment contributes to cooling of leachate, i…
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Puncture protection

October 1, 2014  |  Q&A: GMA Techline

Geomembrane patching? Landfill cooling? Puncture protection? Geomembrane patching? Landfill cooling? Puncture protection? Questions and answers from the GMA Techline Geomembrane puncture protection I am sizing a cushion geotextile that will be protecting a 40-mil LLDPE closure geomembrane against 2i…
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Geosynthetics & wall

October 1, 2014  |  Q&A: GMA Techline

Geomembrane patching? Landfill cooling? Puncture protection? Geomembrane patching? Landfill cooling? Puncture protection? Questions and answers from the GMA Techline Using geosynthetics with existing foundation wall The goal of [our] project is to demolish a commercial building and use one of the ex…
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Use of geogrids in piggyback landfills

June 1, 2014  |  Q&A: GMA Techline

From the GMA Techline Do you have any specific project information on the use of geogrids in constructing piggyback landfills, especially in cold climates? I am interested in examples of the use and evaluation of geogrids when building landfills over closed landfills. Any information you can provide…
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Seepage through geosynthetic-tube dam

June 1, 2014  |  Q&A: GMA Techline

From the GMA Techline I am trying to determine the steady-state seepage through a stack of sand-filled geosynthetic tubes with a triangular cross section (4-3-2-1 tubes). The permeabilities of the sand and the tube material are known. Can you suggest places I should look to get information on how to…
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Minimum low temperature for dual hot-wedge seaming

June 1, 2014  |  Q&A: GMA Techline

From the GMA Techline Does the Geosynthetic Research Institute (GRI) offer any guidance on the minimum allowable ambient temperature to perform double-track fusion welds of HDPE and LLDPE geomembranes? (Jonathan | South Carolina) Reply: We have GRI-GM9 Standard Practice “Cold Weather Seaming o…
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Geogrid reinforcing behind rigid concrete retaining walls

June 1, 2014  |  Q&A: GMA Techline

From the GMA Techline I participated in the Bologna Symposium and I [was] very happy and honored to see you live. I read a [GMA Techline] answer published in Geosynthetics magazine (Oct./Nov. 2009, p. 58), “Geogrid use behind rigid concrete retaining walls.” You refer to the Japanese rai…
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HDPE liner panel orientation?

June 1, 2014  |  Q&A: GMA Techline

From the GMA Techline I am reviewing a construction report where a landfill cell has HDPE one-sided texture laid about 45 degrees from the direction of steepest slope across approximately one-third of the sideslopes. I am looking for quantitative data on any testing done with this type of orientatio…
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Techline responds to question from website comment

April 18, 2014  |  Q&A: GMA Techline

From the GMA Techline RE: Reader question from article: Floating geomembrane cover improves biogas collection, heat retention, and odor control I am interested to install cover lagoon digester at my farm. I search some material from Internet for this project. If you share with me some material relat…
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The GMA Techline and its 5th set of 500 Q’s-&-A’s

April 1, 2014  |  Q&A: GMA Techline

By Bob and George Koerner Introduction The Geosynthetic Materials Association (GMA) Techline was launched in September 2004—now in its 10th year!—as a free worldwide service to answer questions involving the many aspects of geosynthetic materials. From the outset there were no constraint…
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