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Geosynthetics at Flurry Bog

June 1, 2009

Piled embankment design, construction,and monitoring for A1/N1 dual-roadway By Wyatt Orsmond Introduction The A1/N1 section of highway between Newry and Dundalk forms part of a strategic transportation link between Belfast and Dublin. This section includes 14.5km (9mi.) of high-quality, dual-carriageway (divided-highway) construction and was challenged by a tight route corridor threaded between steep mountains and …

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Geosynthetics revive Irish bog

Geosynthetics-lined ‘floating trail’ protects and displays rejuvenated blanket bog at Cuilcagh By Shelby Gonzalez Introduction: Bringing a bog back to life In the late 1980s, the blanket bog on the slopes of Cuilcagh Mountain in County Fermanagh, Northern Ireland, was in bad shape. Years of overgrazing, mechanized peat harvesting, and other mistreatment had damaged the …

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Seattle Seahawks football complex features 8-layer “sandwich”

April 1, 2009

The ‘sandwich’ includes liner, grids and textiles. Compiled and edited by Ron Bygness Among the hundreds of projects judged at the national competition for the American Council of Engineering Companies (ACEC) in Washington, D.C., in April was an athletic compound in Washington state featuring several geosynthetic components. The engineering involved brownfield remediation, as well as …

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Geogrid in action — retaining leaves for flower bed insulation?

February 1, 2009

By Robert Koerner Jonathan Rabe is a landscape gardener with the Minneapolis Park & Recreation Board’s River District. When he and coworker, Rochelle Rau, were preparing to protect a dozen tulip beds from the forces of an oncoming Minnesota winter last fall, they hit upon a new application for geogrids. “I knew we had some …

Alkalinity

October 1, 2008

GMA techline answers from Bob Koerner Subject: Alkalinity — I am working on a site where there is limestone bedrock. There may be some blasting required that could generate blasted rock fill. Is there a concern with using limestone rockfill with HDPE or polyester-coated geogrids? (Mike, Virginia) Reply: There is no concern over using the …

Tensar geogrid wins European building awards

August 1, 2008

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 recognition within road construction and also won the …

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Three challenges in using SRWs and other reinforced-soil structures: Part 3B

By Michael R. Simac, P. E., and Blaise J. Fitzpatrick, P. E. Introduction While segmental retaining walls (SRWs) have been routinely used for more than 15 years now, there are still three challenging issues facing owners considering their use. What is the best way to procure, design, and then build these structures to minimize short-term …

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Geogrid slope reinforcement, track refurbishing for German rail lines

June 1, 2008

Compiled and edited by Ron Bygness Hallstadt rail crossing An existing railroad crossing in the Hallstadt section of railroad track 5100, from Bamberg to Hof (Saale), had to remain open for rail traffic, but had to be replaced by an underpass for the street. An underpass for Michelin Street, under the railroad tracks, had to …

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Three challenges in using SRWs and other reinforced-soil structures: Part 3A

By Michael R. Simac, P. E., and Blaise J. Fitzpatrick, P. E. Introduction While segmental retaining walls (SRWs) have been routinely used for more than 15 years now, there are still three challenging issues facing owners considering their use. What is the best way to procure, design, and then build these structures to minimize short-term …

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Repairing Yi-Lan-I Road in Taiwan

April 1, 2008

By Vincent Ho and Steven Chang Introduction Stretches of the Yi-Lan-I Road in Taiwan are located more than 3,200ft (1,000m) above sea level. It’s an important road that provides the primary access to the National Taipingshan Forest Recreation Area. But during a particularly rainy 75-day period (mid-July through September 2005), the region experienced abundant rainfall …