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. […]

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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 […]

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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 […]

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Erosion control materials

January 1st, 1970

These products are designed to help solve erosion- and sediment-control problems and to provide long-term stabilization by establishing and maintaining vegetative cover. Erosion-control products give engineers ready solutions for one of the fastest-growing design niches. Many of these products work with vegetation to form a biocomposite solution to erosion. The charts in this section are […]

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Geosynthetics in the Greater Grand Forks Greenway

January 1st, 1970

By Adam Regn Arvidson The turf reinforcement mat (TRM) in the Red River Greenway project is Enkamat, manufactured by Colbond, a Dutch company with production facilities in Europe and the U.S. The 3-dimensional nondegradable matting is made of continuous nylon or polypropylene filaments fused at their intersections, with 95% of the matting open. The 3-D […]

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Strength without density: Geofoam at work on the CAS green roof

January 1st, 1970

An innovative redesign transforms the California Academy of Sciences. By Shelby Gonzalez Introduction The California Academy of Sciences (CAS) in San Francisco has completed a transformation. Its innovative redesign has already gained international recognition as a cultural icon. Under one “living roof,” the new Academy contains a planetarium, an aquarium, and a natural history museum. […]

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First artificial surf reef in Europe

January 1st, 1970

Work is nearly completed in the building of Europe’s first artificial surf reef near Dorset in southwest England. The project, estimated at £2.7 million (ca. $5.4 million U.S.), is designed to double the size of the waves at Boscombe, Bournemouth, to 4m (13ft) as well as greatly increase the number of good surfing days. Kerry […]

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Geotextiles in unpaved roads: A 35-year case history

January 1st, 1970

By William M. Hawkins Abstract This article presents current information on geotextiles installed experimentally in an unpaved road 35 years ago. In 1972, geotextiles were largely untested, and the site was set up as an accelerated field test to determine the comparative performances of several fabrics for use as a geotextile. But because the site […]

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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. […]

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History of the county engineer in Ohio

January 1st, 1970

The only elected CEs in the country Editor's note: At the 2007 meeting of the ASCE GeoInstitute in Denver, Warren Schlatter of Defiance County, Ohio, began his presentation on the county’s GRS bridge building plan by saying: “I like my job [as county engineer] and I’d like to keep doing it for a while. The […]

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