GeoAmericas 2008: Show wrap-up

April 1, 2008

Doing business at GeoAmericas-2008: An energetic business hall. Good to see old friends, fun to meet new friends. First-rate, well-attended technical session and keynotes. Fiesta, fiesta, fiesta

Taking issue with recommendations

The “Kam Kotia Project Case Study” in the February/March 2008 issue of Geosynthetics magazine starts off with interesting descriptions of the project design, geosynthetic testing, and construction. However, the summary and recommendations section provides misleading statements. The author writes, “As per the GRI’s White Paper of April 2005: Do not use GCLs with needlepunched nonwoven …

Request-for-Proposals

The Geosynthetic Institute (GSI) is delighted to announce a worldwide call for requests-for-proposals (RFPs) focusing on innovative geosynthetics research and development projects. There will be multiple awards made, each for $10,000 per year, and they are renewable, pending an annual written report, to a total amount of $25,000 per student. It is important to note …

Review and analysis of GRI-21 Conference

Our 21st annual GRI conference went off without a hitch in Cancún, Mexico on March 5, 2008. The morning session was devoted to geosynthetics in agriculture applications and had seven presentations. Use of geosynthetics in agricultural activities in Taiwan are impressive. The use of large bags for silage and capture of animal waste for gas …

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Geomembrane sealant to concrete pad

From the GMA Techline Subject: Geomembrane sealant to concrete pad— This inquiry is about how to anchor geomembrane to a concrete pad, as well as rendering a perfect seal between the two to prevent water from seeping in between the concrete and the geomembrane. (Schar, London) Reply: Geomembrane anchorage to concrete surfaces is generally accomplished …

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Strength testing

From the GMA Techline Subject: Strength testing— Is there now, or in the works, any industry standard for strength testing the extrusion weld connecting 60-mil HDPE to the poly-loc embedded strip? (Bob, Wisconsin) Reply: There are no generic standards or specifications for the situation you describe. People tend to copy sketches and materials from others …

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GCLs and slope stability

From the GMA Techline Subject: GCLs and slope stability — I’d like to find out what the current thinking is on designing for slope stability with GCLs … perhaps summarize the current stateof- the-practice regarding residual strength of reinforced GCLs used in bottom liners at landfills. (Myron, Washington) Reply: Of course, there are ongoing tests …

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Slack calculations

From the GMA Techline Subject: Slack calculations — Do you have a reference that discusses the impact of environmental conditions and the procedures for determining “slack” into an HDPE liner at the time of installation? (Rod, California) Reply: The subject of calculating slack in geomembranes for the purpose of backfilling, and then having the lower …

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Pipeless drainage system

From the GMA Techline Subject: Pipeless drainage system — We are designing residue cells for a mine in northern Minnesota, and they’ve opted for a pipeless drainage system in the cells. The residue is a very fine, saturated, silt-sized particle, quite sticky, low LL/PL. I’ve done a little work with geotextiles, but my gut tells …

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Classifying geotextiles

From the GMA Techline Subject: Classifying geotextiles — What is a “Class A” geotextile? (Ron, Maryland) Reply: I don’t know, but it sounds pretty good! I suspect that it comes from a state specification where product values are listed in an ascending or descending order, such as Class A, B, C, etc. or Class 1, …