Mold in green roofinstallations

February 1st, 2015

Mold in green roof installations Mold in green roof installations Questions and answers from the GMA Techline Mold in green roof installations Recently there has been a greater demand for sustainable projects in Southern California, so I was glad [to read the article in Geosynthetics magazine] “Geosynthetics: The science that makes green roofs work." I […]

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Asphalt over geomembrane?

February 1st, 2015

Questions and answers from the GMA Techline Asphalt over geomembrane? We have a project where we want to place asphalt concrete over a 40mil-thick HDPE geomembrane. The asphalt concrete is 3in.-thick and would be the lining for a surface water ditch. On the outside of the ditch, we have a pavement section (asphalt concrete over […]

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Part 1: The first double geomembrane liner 40 years later

February 1st, 2015

First constructed in June 1974 and has been in continuous service since then. By J.P. Giroud and J.P. Gourc Introduction The first double liner with two geomembranes was constructed in June 1974 and has been in continuous service since then. The double-lined structure is a water reservoir located in Pont-de-Claix, near Grenoble in southeastern France. […]

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GCL internal strength

February 1st, 2015

Questions and answers from the GMA Techline GCL internal strength In section 6.3.4 of Designing with Geosynthetics Fifth Edition, the internal shear reinforcement for a GCL is calculated using the geogrid veneer reinforcement method. This results in an internal reinforcement strength using kN/m. Manufacturers of GCLs report their internal shear strengths in kPa. Do you […]

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Geosynthetics article wins first-place gold

February 1st, 2015

IFAI titles take top honors at magazine awards ceremony By Ron Bygness A Geosynthetics magazine article featuring the management of the pond and reservoir systems at the Palo Verde Nuclear Generating Station has earned a first-place gold award for Best Technical Article from the Minnesota Magazine & Publishing Association (MMPA). The article, which ran as […]

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Report from the North American Geosynthetics Society (NAGS)

February 1st, 2015

By Bob Mackey NAGS election results for 2015–2017 President—John Henderson President-elect—Richard Brachman Treasurer—Corey Bobba Vice Presidents—Dhani Narejo, John McCartney, Stan Boyle Congratulations to all! IGS proceedings library The International Geosynthetics Society (IGS) proceedings library is now online at www.geosyntheticssociety.org and can be accessed immediately to download papers from previous IGS conferences. This treasure trove of […]

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Global Geosynthetics Summit

February 1st, 2015

By George Koerner As some of you know, the Geosynthetic Institute (GSI) and the Bombay Textile Research Association (BTRA) have had an association for more than five years. In September 2014, we advanced this relationship during the Global Geosynthetic Summit “Enhancing the Application of Geosynthetics in the Infrastructure Sector.” The summit was held Sept. 5–6 […]

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Expanding the geosynthetics market

February 1st, 2015

By Lucie Passus Lobby Day Fall 2014 Despite a shakeup in the U.S. Congress following the November 2014 midterm elections, GMA Lobby Day Nov. 18–19, 2014, saw its largest and most active member participation yet. More than 30 attendees from GMA member companies and geosynthetics allies convened in Washington, D.C., to participate in 28 congressional […]

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Rail project required separation, filtration, reinforcement

February 1st, 2015

Introduction The Canadian National Railway (CN Rail) wanted to build an additional six-track extension at its Transcona Yards in Winnipeg, Manitoba. Heavy railcars were expected to pass over this extension area and CN Rail was looking for an economical, efficient, environmentally friendly, and technically sound solution for its track extension. Challenges The construction site had […]

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Reconstructing and relining Nottingham Lake high in the Rockies

February 1st, 2015

Replacing a 32-year-old liner. By Bart Ewing and Duff Simbec Introduction Nottingham Lake is nestled high in the Rocky Mountains and has been the pride of Avon, Colo., for as long as anyone can remember. Tourists and residents use the lake for winter recreation and for boating, fishing, and swimming in the summer. It serves as […]

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