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(civil engineering)
Any synthetic material used in geotechnical engineering, such as geotextiles and geomembranes.


Any synthetic material used in geotechnical engineering.

Geotextiles are used with foundations, soils, rock, earth, or other geotechnical material as an integral part of a manufactured project, structure, or system. These textile products are made of synthetic fibers or yarns and constructed into woven or nonwoven fabrics that weigh from 3 to 30 oz/yd2 (100 to 1000 g/m2). Geotextiles are more commonly known by other names, for example, filter fabrics, civil engineering fabrics, support membranes, and erosion control cloth.

Permeable geotextiles perform three basic functions in earth structures: separation, reinforcement, and filtration. Such geotextiles can thus be adapted to numerous applications in earthwork construction. The major end-use categories are stabilization (for roads, parking lots, embankments, and other structures built over soft ground); drainage (of subgrades, foundations, embankments, dams, or any earth structure requiring seepage control); erosion control (for shoreline, riverbanks, steep embankments, or other earth slopes to protect against the erosive force of moving water); and sedimentation control (for containment of sediment runoff from unvegetated earth slopes).

A geomembrane is any impermeable membrane used with soils, rock, earth, or other geotechnical material in order to block the migration of fluids. These membranes are usually made of synthetic polymers in sheets ranging from 0.01 to 0.14 in. (0.25 to 3.5 mm) thick. Geomembranes are also known as flexible membrane liners, synthetic liners, liners, or polymeric membranes.

Early liners included clay, bentonite, cement-stabilized sand, and asphalt. Modern geomembranes are commonly made of medium-density polyethylenes that are very nearly high-density polyethylenes (HDPE), several types of polyvinyl chloride (PVC), chlorosulfonated polyethylene (a synthetic rubber), ethylene propylene diene monomer (EPDM), and several other materials. Some geomembranes require reinforcement with an internal fabric scrim for added strength, or plasticization with low- molecular-weight additives for greater flexibility.

Geomembranes are able to contain fluids, thus preventing migration of contaminants or valuable fluid constituents. Since they prevent the dispersal of materials into surrounding regions, geomembranes are often used in conjunction with soil liners, permeable geotextiles, fluid drainage media, and other geotechnical support materials. The major application of geomembranes has been containment of hazardous wastes and prevention of pollution in landfill and surface impoundment construction. They are also used to a large extent in mining to contain chemical leaching solutions and the precious metals leached out of ore, in aquaculture ponds for improved health of aquatic life and improved harvesting procedures, in decorative pond construction, in water and chemical storage-tank repair and spill containment, in agriculture operations, in canal construction and repair, and in construction of floating covers for odor control, evaporation control, or wastewater treatment through anaerobic digestion. See Hazardous waste

References in periodicals archive ?
For most of the geosynthetics, such as Geosynthetic A (PP geotextile and PET yarn), Geosynthetic B (HDPE geogrid) in the present study, PP geogrid (14), Geosynthetic W (PP and PET geotextile), and Geosynthetic P (polyamide geotextile) (12), this rate-dependent viscous property is defined as the isotach viscosity.
Washington, October 8 (ANI): French and Norwegian partners of a scientific project have developed a robust geosynthetic bag that can be filled with locally available, low-grade soil and used to build protective infrastructures capable of withstanding sea and ice erosion in the harsh Arctic climate.
The impact of geosynthetic materials is defined through reological characteristics of asphalt: the modulus of elasticity and the viscosity of asphalt.
In 1991, Nicolon joined forces with North Carolina-based Mirafi, which had been experimenting with even more sophisticated geosynthetic fabrics since the late 1960s.
This paper demonstrates the various geosynthetic applications and the related engineering solutions to mitigate such Tsunami devastations.
Since joining the company, he has been promoted several times, including technical product manager for the company's SE geosynthetic line and marketing manager of the vehicular bridge line.
Geosynthetics include products such as geotextiles, geomembranes, geogrids, geonets, geocells, geofoam, geosynthetic clay liners and prefabricated geocomposites that are used in civil engineering applications.
The resin exceeds the requirements of the Geosynthetic Research Institute's GM13 specification for smooth and textured HDPE geomembranes, and replaces BP Solvay's 22-HLMI grade, G36-24-150.
The Navy has picked a potential solution of capping Site 14 with a geosynthetic clay liner - a sort of high-tech Tupperware lid for toxic waste.
Other participants in the test are J&L Engineering, Canonsburg, PA, the Geosynthetic Research Institute at Drexel University, and the Pennsylvania Department of Environmental Resources.
Geosynthetic clay liner (GCL) belongs within the many subcategories of the geosynthetic market, and is an alternative to conventional compacted clay liners.
4: supply of insulation materials and roofing elements for roof drainage (hydro and thermal insulation, geosynthetic products, plastic, tiles, roof tops, tinsmith products, etc.