A - B - C - D - E - F - G - H - I - J - K - L - M - N
O - P - Q - R - S - T - U - V - W - X - Y - Z
F
filament
Continuous fibre of indefinite length. Monofilaments and multifilaments are mainly used for geosynthetic products.
fibre
See staple fibre
fineness
A relative measure of fibre size for manufactured fibres, usually expressed in denier, dtex or tex
fleece
A wide film of at least one web of staple fibres or filaments which are not bonded together.
foil
A thin low permeable plastic sheet (thickness < 1.0 mm), consisting of a synthetic raw material, for sealing purposes.
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G
GCL
See geosynthetic clay liner
geocomposite
Multi-layered material with at least one geotextile or geotextile-related product which takes over several functions (filtration, drainage, separation, reinforcement, packing, erosion control, protection and sealing), e. g. geosynthetic drainage system (separation, filtration, drainage; on a geomembrane additionally protection).
geogrid
A planar synthetic structure consisting of a regular open network of integrally connected tensile elements, which may be linked by extrusion, bonding or interlacing (e.g. knitted), used in contact with soil/rock and/or other geotechnical material in reinforcement applications. It is i.e. differentiated between junction stiff (welded bars) and flexible (e.g. PVC coated) geogrids.
geomembrane
A very low permeable material in the form of a manufactured sheet, used in geotechnical and civil engineering applications with the purpose of reducing or preventing the flow of fluid and/or vapour through the construction (see sealing). It is differentiated between homogeneous and heterogeneous geomembranes (geomembranes are &Mac179; 1.0 mm; less than 1.0 mm are foils).
geosynthetic
A planar synthetic material used in contact with soil/rock and/or other geotechnical material in filtration, drainage, separation, reinforcement, protection, packing, erosion control and sealing applications.
geosynthetic clay liner
A factory assembled product of geosynthetic materials and low hydraulic conductivity clay materials (e.g. bentonite) in the form of a sheet for sealing applications, in which the clay layer is encapsulated between geosynthetics (cover and carrier geotextile), or connected with a geosynthetic. Shear force transmitting geosynthetic clay liners are needle-punched (directional independent) or stitch-bonded (directional dependent).
geosynthetic drainage system
Three-dimensional prefabricated product manufactured from synthetic raw materials, consisting of a drainage layer (core) which is in most cases covered with at least one geotextile filter, for liquid and/or vapour transportation.
geotextile
A planar, permeable, synthetic textile material, which may be nonwoven, knitted or woven, used in contact with soil and/or other materials in geotechnical and civil engineering applications. Geotextiles can fulfil one or more functions (filtration, separation, drainage, reinforcement, protection, packing, erosion control). Wovens, geogrids (geotextile-related product) and knitted products are usually used for reinforcement, nonwovens for filtration, separation, drainage, protection, packing, erosion control applications.
geotextile-related product
A planar, permeable, synthetic material, which does not comply with the definition of a geotextile, used in contact with soil and/or other materials in geotechnical and civil engineering applications, e.g. geogrid.
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H
heterogeneous geomembrane
Industrially low permeable product (liner), mostly manufactured with synthetic raw materials, where at least one layer has to be designated as homogeneous geomembrane. One such product is e. g. a heterogeneous geomembrane with a copper sheet which additionally prevents the diffusion of chlorinated hydrocarbons.
high density polyethylene (HDPE)
Thermoplastic currently showing the best chemical resistance and excellent welding performance. HDPE has a density of approx. 0.94 – 0.96 g/cm_ and is mostly used for products in landfill engineering applications.
homogeneous geomembrane
Industrially low permeable product (liner) manufactured with synthetic raw materials for sealing applications, such as a foil (thickness < 1.0 mm) or thermoplastic geomembrane (thickness &Mac179; 1.0 mm). The most common raw materials are polyethylene (PE), polypropylene (PP) or polyvinyl chloride (PVC).
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J
junction stiffness
Description of the junction strength of tensile elements (e.g. geogrid) for reinforcement in which the junctions are formed such that no displacement takes place and the tensile force transfer is optimal.
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