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Measuring puncture resistance
January 1st, 1970
From the GMA Techline RE: Measuring puncture resistance How can I measure hydrostatic puncture resistance of a geomembrane in the field with different conditions (with or without geotextile)? [My company] uses geomembrane in agricultural pools. (Elham) Reply: The test you are looking for is ASTM D5716. It is a large burst test conducted by air […]
Project Angostura
January 1st, 1970
Geotextile tube coffer dam By Sören Schmidt The problem, the plan... The Angostura project is owned by Colbún, one of the largest energy producers in Chile. Angostura is a hydroelectric dam project with a capacity of 350mw. The dam is situated in the Bio-Bio River, a few kilometers downstream from two other Bio-Bio hydroelectric facilities. […]
Case study: Music City Center green roof
January 1st, 1970
By Allan Wingfield Nashville’s new Music City Center convention facility features a unique sloped green roof design designed to mimic Tennessee’s rolling hills. There is a 65-ft difference in elevation from the northwest corner of the site to the southeast corner. Many challenges needed to be addressed, including keeping the vegetation evenly watered while diverting […]
What is GRS? (Geosynthetic-reinforced soil)
January 1st, 1970
The soil mass of GRS systems is reinforced in layers with a polymeric geosynthetic (e.g., geogrids or geotextiles), and the layered reinforcement is attached to facing elements that constitute the outer wall. Because the facing elements are commonly composed of articulated units that are not rigidly attached to each other, the wall is deemed flexible. […]
Geotextiles
January 1st, 1970
These products are engineered to provide cost-effective solutions to meet specific design requirements for separation, reinforcement, filtration, drainage, and protection applications. Although engineers have developed numerous applications for geotextiles, there are ï¬ve major functions: separation, reinforcement, ï¬ltration, drainage, and protection. The major geotextile classifications are woven, nonwoven, and knitted. Generally, woven fabrics exhibit high tensile […]
Grand Isle to get storm-surge protection before 2009 hurricane season
January 1st, 1970
By Ron Bygness Ending more than a dozen years of debate regarding plans to upgrade storm-surge protection for Grand Isle, La., Gov. Bobby Jindal’s administration signed an agreement in April with the U.S. Army Corps of Engineers (USACE) for a $50 million project to rebuild the island’s decimated flood barriers. Grand Isle is located on […]
Geogrids
January 1st, 1970
Geogrid products are designed for reinforcement and, characteristically, are integrally connected to elements separated by in-plane apertures. Geogrids form a distinct category of geosynthetics designed for reinforcement. These products are characterized by a relatively high tensile strength and a uniformly distributed array of large apertures (openings between the longitudinal and transverse elements). The apertures allow […]
Geosynthetic clay liners (GCLs)
January 1st, 1970
Bonding clay to geosynthetic materials has created an economical, long-term solution for many applications. Geosynthetic clay liners (GCLs) are hydraulic barriers made of clay bonded to a single geosynthetic layer or to multiple geosynthetic layers. Because of its low permeability, swelling capacity and relative abundance, natural sodium bentonite is the preferred clay component of GCLs. […]
Drainage materials
January 1st, 1970
Geonets, sheet drains, edge drains, and prefabricated vertical drains are all designed to offer strong, performance-enhancing alternatives to traditional drainage systems. Geocomposite drainage systems are engineered to minimize costly, conventional graded-aggregate and/or perforated-pipe subsurface drainage systems. Geonets, sheet drains, pavement edge drains and prefabricated vertical drains (PVDs) have reached acceptance as state-of-the-practice because they provide […]
Geocells
January 1st, 1970
Geocells are engineered for protection and stabilization applications. They are often used to help improve the performance of standard construction materials and erosion-control treatments. Geocell products are three-dimensional, expandable panels made from high-density polyethylene (HDPE), polyester or another polymer material. When expanded during installation, the interconnected strips form the walls of a flexible, three-dimensional cellular […]