Break/yield strengths

October 1, 2008  |  Products

From the GMA Techline Subject: Break/yield strength —I am a structural engineer working in Chile. I used the following text from your organization: GM13, GM17, and GM19. About GM13 (Rev.8: July 10, 2006), page 10 from this text shows yield strength and break strength for HDPE geomembrane-textu…
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Landfill temperatures

October 1, 2008  |  Products

From the GMA Techline Subject: Landfill temperatures — I’ve had discussions with a South African consultant regarding the effects of temperature on the life expectancy of the geomembrane found in South African hazardous landfills. They have tested and found that they are getting temperat…
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Flash point

October 1, 2008  |  Products

From the GMA Techline Subject: Flash point— A contractor is proposing installation of a PVC geocomposite in a tunnel as a lining. The California Code of Regulations stipulates the nonuse of materials with a flash point of 100°F or less. Would any of the cements/sealers used in installation…
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Rub sheets

October 1, 2008  |  Products

From the GMA Techline Subject: Rub sheets— What kind of developments are going on these days with rub sheets in leachate sumps with sideslope risers? I’ve seen multiple sheets of geomembrane, but I am more familiar with thick (100- and 120-mil) stock sheet material. Also, what do you thi…
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Geomembrane costs

October 1, 2008  |  Products

From the GMA Techline Subject: Geomembrane costs — What is the average cost in U.S. dollars, for installation only, of 10,000m2 and 100,000m2 of PVC membrane and HDPE membrane? (Lindo, Louisiana) Reply: I can’t give you an answer, since costs vary with the thickness of the geomembrane, t…
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How long will my liner last?

October 1, 2008  |  Products

What is the remaining service life of my HDPE geomembrane? By Ian D. Peggs, P.E., P.Eng., Ph.D. Introduction In his keynote lecture at the GeoAmericas-2008 conference last March, Dr. Robert Koerner (et al., 2008) of the Geosynthetic Institute (GSI) reported the ongoing Geosynthetic Research Institut…
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Geotextile form bags used to help end defects in factory-built houses

August 1, 2008  |  Products

California-based Sure Safe EFS has announced that its engineered foundation system has proven effective in eliminating defects caused by improper settling of factory-built modular homes on faulty foundations. One of the keys to the system is that when all of the steel buttresses are in place below t…
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Geotextile-wrapped layer is key to drainage project in Ontario

August 1, 2008  |  Products

A geotextile-wrapped layer of stone fill is an important element in a $3.5 million drainage project in the Thunder Bay neighborhood of Fort Erie, Ontario. The construction includes a series of storm chambers that will convey water underground, or in cases of heavy rain or runoff, store the water in …
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Tensar geogrid wins European building awards

August 1, 2008  |  Products

The TriAx geogrid from Tensar International won a gold medal at the Brno International Building Fair in the Czech Republic and also at Autostrada 2008 in Kiecle, Poland. From the 800 exhibiting companies and 8 award winners at Autostrada, TriAx was the only geosynthetics product to receive recogniti…
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A forensic hypothetical: The case of the percolating water

April 1, 2008  |  Products

By Dov Leshchinsky Introduction Nearly every SRW system in the market has experienced some sort of failure. Like the power of chum in luring sharks, failures attract attorneys and engineering experts. Typically, the attorney for the plaintiff will compile “expert” reports providing a lis…
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