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…
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…
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…
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…
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…
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 …
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…
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…
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…
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…