How long will my liner last?

October 1, 2008

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 Institute (GRI) work to make the first real stab at assessing …

The Geosynthetic Institute Fellowship Program

By Bob Koerner It was of great personal interest to look into Wikipedia® and learn that there are 1.6 million nonprofit organizations in the United States! Many other countries, such as the United Kingdom and Canada, have similar organizations. I believe that most of these nonprofits, e.g., universities and colleges, religious organizations, hospitals and health-care …

Members Only  

Shear strength

From the GMA Techline Subject: Shear strength — We are looking for interface shear strengths of a geocomposite- to-geocomposite interface. Both composites would have nonwoven fabric. Is test data available that indicates what this interface strength would be? (Chet, Ohio) Reply: The shear strength of the 2 nonwovens against one another is in the neighborhood …

Members Only  

Geomembrane costs

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, the site location, and time of year. What …

Members Only  

Rub sheets

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 think of sandwiching a nonwoven cushion layer …

Members Only  

Drainage geocomposite

From the GMA Techline Subject: Drainage geocomposite— I have to test drainage geocomposite material regarding friction behavior and internal shear strength. In terms of references, I see 2 options: friction test (drain material/soil), according to ASTM D5321; and internal shear strength, according to ASTM D5321. I know that for friction test of drainage material, it …

Members Only  

HDPE question

From the GMA Techline Subject: HDPE question— I am a high school student doing a science project that is testing the chemical resistance of HDPE. Since we may not be able to test a 60-mil HDPE used in landfills, I was wondering about other products made from HDPE that could serve as a substitute. Would …

Members Only  

Flash point

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 of this liner have a flash point …

Members Only  

Teaching geosynthetics

From the GMA Techline Subject: Teaching geosynthetics— I am wondering if you have a list of universities that teach at least one full-time course in geosynthetics. Thank you. (Craig, Pennsylvania) Reply: You have come to the right place! As the author of the only textbook on geosynthetics, I know from book orders which universities are …

Members Only  

Landfill temperatures

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 temperatures on the membrane of up to 70°C (ca.160°F). He has read …