Effects of temperature on geomembrane strength

October 1, 2007  |  Products

From the GMA Techline Subject: Effects of temperature on geomembrane strength— I am working on the design for some lined reservoirs where the liner may be exposed for some time during the summer, with the temperatures possibly approaching 120°F. We plan to use a 60-mil HDPE geomembrane. Gi…
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Polymer question

October 1, 2007  |  Products

From the GMA Techline Subject: Polymer question— I would like to know if you can tell me which polymer is better to make nonwoven geotextiles, polyester or polypropylene? My problem is that I have to choose between two geotextiles with the same properties but with different polymers. (Ingrid, …
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Landfill liner installation inspection

October 1, 2007  |  Products

From the GMA Techline Subject: Landfill liner installation inspection— I was hoping that maybe you would have information on training or certification on the inspection of installations of geomembrane liners for landfills. (Daniel, New York) Reply: We have the exact program you are looking for…
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Gas diffusion coefficients

October 1, 2007  |  Products

From the GMA Techline Subject: Gas diffusion coefficients— I am in the process of evaluating the mass flux of a gas moving through a 30-mil PVC geomembrane. I am working with volatile organic compounds in soils. What I need are typical values based on unsaturated soil vapors. I have found info…
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New resin for geomembranes

August 1, 2007  |  Products

Dow Chemical Co. has announced the commercial availability of a new HDPE (high-density polyethylene) resin for use in geomembranes, the synthetic materials commonly used as impermeable liners in geotechnical engineering applications for environmental protection, water collection and preservation, an…
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Waterproofing job for Dubai tunnel

August 1, 2007  |  Products

The $3.3 million(U.S.) Jumeirah Vehicular Tunnel waterproofing project was completed in April. The 1,400m tunnel is the only link for vehicles between Jumeirah Palm Island and the crescent areas surrounding it at the spectacular palm island complexin Dubai. The waterproofing system, designed and exe…
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Background and most recent GRI standards

August 1, 2007  |  Products

By Bob Koerner In the 1980s, while supervising graduate research students in their geosynthetics theses topics, the issue of writing generic and standardized procedures arose in this (quite new at the time) geosynthetics field. Rob Swan generated our first formalized test methods with what became GR…
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Caveat venditor—When practice is far from theory

June 1, 2007  |  Products

By Ian D. Peggs At the Geosynthetics-2007 conference earlier this year in Washington, I had dinner with a geomembrane manufacturer colleague and he asked me, “How should we respond to a customer’s question: ‘Is your geomembrane compatible with my chemical solution of A, B, C, at XY…
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Geotextile transport layer

June 1, 2007  |  Products

From the GMA Techline Subject: Geotextile transport layer We need some information about the characteristics of the transport layer (special geotextile) used in association with leak-detection sensors and placed between a drainage geocomposite layer (geonet plus geotextile separator) and the HDPE ge…
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Cost estimate data

June 1, 2007  |  Products

From the GMA Techline Subject: Cost estimate data In 2006, we completed a 30-acre pond (depth, approximately 30 ft.), and now we want to estimate the cost for a pond of similar size for a construction start in November 2007. For estimating purposes, are you able to suggest a percentage increase that…
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