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Review and analysis of GRI-21 Conference

April 1, 2008 | News

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…

Geomembrane sealant to concrete pad

April 1, 2008 | Products

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: Geomembra…

Strength testing

April 1, 2008 | Features

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 de…

GCLs and slope stability

April 1, 2008 | Products

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 land…

Slack calculations

April 1, 2008 | News, Q&A: GMA Techline

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 …

Pipeless drainage system

April 1, 2008 | Features

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…

Classifying geotextiles

April 1, 2008 | Products

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, suc…

GRI Standards

April 1, 2008 | News, Q&A: GMA Techline

From the GMA Techline Subject: GRI Standards — I am seeing references to GRI Standards GM 10, GM 14, and GM 18 in a project spec for a facility that will be under construction soon. There are other references too, of course, but these I’ve listed are not current, according to your Web si…

Geomembrane thickness

April 1, 2008 | Products

From the GMA Techline Subject: Geomembrane thickness— We have been designing an ash pond for a thermal- electric plant, where we intend to use an HDPE geomembrane for the lining system. Can you recommend what thickness we should use for safety reasons, as our project is located near Halong Bay…

Hayward Baker opens new office in Twin Cities

April 1, 2008 | News

Hayward Baker Inc. geotechnical contractor has opened a new sales, project management, and engineering services office in the Twin Cities. The office is located in Bloomington, near the Minneapolis-St. Paul International Airport and the Mall of America. According to HB, the opening of the Twin Citie…