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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 ?
A new version, called the GeoGrid Lock pattern, flows with the contour of the Heli-m, increasing strength and further eliminating unnecessary material (and weight).
Privately owned and headquartered in Middletown, Ohio, CONTECH is the only nationwide provider of corrugated metal and plastic pipe, detention/retention systems, geogrid and geotextile materials, erosion control products, bridge structures, retaining wall systems and stormwater treatment solutions.
The use of geogrid will be utilized to limit any differential settlement in the newly filled in areas of the triangular bay.
In addition, focus on road infrastructure development by various national governments and consequently several ongoing and upcoming projects are expected to boost the geogrid and geotextiles market in this region within the forecast period.
PRODUCT DEVELOPMENTS/LAUNCHES II-29Presto Introduces New Construction Mat II-29Layfield Introduces a Fire Retardant Geomembrane II-29Huesker Launches Tektoseal GCLs II-29GSE Introduces High Temperature Polyethylene Geomembrane II-29BMC Gulf Unveils Agru-Superflex-el II-29Propex Extends Product Portfolio with addition of GRIDPRO(TM) II-30ADS Adds 11 Geogrid Products II-30Karl Mayer Malimo Introduces New Geogrids II-30
Contract awarded for Covers changing classrooms with truss system and affected by inclement weather includes dismantling the existing, cover, truss, insulation, ceiling, and reinstall the existing ceiling, new: cover, strollers, insulation, + geogrid, patching paint for patching.
Tenders are invited for supplying and laying of secugrid 40mm size geogrid as a sub work in the main work mtc to road from bapatla pedananandipadu r&b road to narasayapalem
The mesh, known as a geogrid, adds an extra, durable layer to the asphalt and also allows for less asphalt to be used during building.
Topics include research on applying high precision ultrasonic ranging in the auto leveling system of pavers, influence of cutter geometric parameters on the stability of the milling process of thin-walled blades, studies on solar drying of oily sludge, fault diagnosis of aircraft power supplies based on a priority dynamic fault tree, the development of double-wave bands phototherapy, low temperature performance of a fiberglass geogrid, structure optimization of ship unloaders for weight reduction by FEA, design of a bionic flapping propulsion device, a study of traditional textile machinery in Southeast Shanxi Province, and more.