Ralph Bruno joins Propex as executive vice president

October 15, 2009

Propex Operating Co. LLC has named Ralph Bruno executive vice president of its new Performance Technology business unit. The restructuring of the business unit with a direct line to the CEO lays the foundation for future growth and increased service to customers, the company said in a press release. The move was described as “an …

Former Tenax division is now Syntec

October 13, 2009

“Geosynthetics Evolved” is the credo of the newest manufacturer to enter the geosynthetics industry. Syntec, based in Baltimore, is a newly formed company with many familiar faces. In a recent transaction, Syntec acquired the environmental division of Tenax Corp., a well-known name in polymer extrusion technology for the past 50 years. According to a press …

Forecast: More wind turbines coming

October 8, 2009

According to a recent report, the market for wind turbines will continue to grow through 2015, driven by new generation additions as well as replacement of smaller, older turbines with larger, more-efficient turbines. Pike Research, a clean tech market intelligence firm, forecasts that the turbine market will resume its growth in 2011, following three years …

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Show us your favorite geosynthetics photo

October 7, 2009

By Archie Filshill This one has been a favorite of mine for some time. We were asked to complete a leak-location survey to identify the source(s) of a leak in a PVC liner for a decorative pond. The general contractor was responsible for exposing the liner around the perimeter. About five minutes into the job, …

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Floating interface testing for direct shear

From the GMA Techline Subject: Floating interface testing for direct shear Can you give us some guidance on the appropriateness of conducting geosynthetic direct shear testing using “floating” or multiple interfaces? It is our understanding that this method is typically used when the critical interface is not known. (Victoria, USA) Reply: The first test using …

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GSI/GRI-GG5 and ASTM D6706

GMA techline answers from Bob Koerner Subject: GG5 I referenced GSI/GRI–GG5 on a segmented retaining wall system spec and need to know if this is correct. Supposedly on your website this standard was crossed out and noted to refer to ASTM D6706. Should I replace GG5 with the ASTM standard? Please clarify. (Rebecca, New Jersey) …

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Installing prefabricated vertical drains

From the GMA Techline Subject: Geocomposite question We are looking into installing prefabricated vertical drains to relieve excess pore water pressure for a surcharge fill. Following the information listed in Designing with Geosynthetics, 5th Edition, the statement 1-2 meters is the typical spacing for PVDs. Are there any in-depth investigations, studies, or publications that have …

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Geomembrane installations

From the GMA Techline Subject: Geomembrane installations What are the pros and cons of letting a contractor proceed with the installation of a liner when the moisture content is lower than desired? (Marvin, New York) Reply: I have to make some assumptions before I answer your question. I assume that you mean installation of a …

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Liner thickness

From the GMA Techline Subject: Liner thickness I use an equation from your Designing with Geosynthetics, 2nd Edition, to calculate liner thicknesses. Recently, I calculated a geomembrane thickness of 100 mils for a landfill with 200ft of waste. The supplier stated that he had never seen liner that thick used. Upon reviewing other designs, it …

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HDPE welding

From the GMA Techline Subject: HDPE welding [We are] seeking information that would assist on welding 60-mil white HDPE above 104°F. We have successfully demonstrated in the past with destructive and nondestructive testing welds that would exceed project specifications. We are currently on a large project where the engineers are seeking more substance to our …