Geotextiles Construction Techniques
The use of geotextiles determines the form of the textile as its structure, in turn , determines whether or not the structural engineering requirements are satisfied. (46)
The various forms of geotextiles are woven , nonwoven , knitted , composite geotextiles beside special forms like grids, nets and meshes. (2)
A majority of the geotextiles on the market are comparatively simple fabrics. Approximately 75% are non- woven and take the form of heat – bonded continuous filament or needle – punched filament or staple , made of synthetic polymers. These are relatively lightweight fabrics, weighing from 120 gm to 250 gm per sq. m.
Some heavier weight are needle punched fabrics , up to about 650 gm per sq. m. , used for specific applications such as road paving, railroad ballast underlay and canal revetment filters.
Woven fabrics hold about 15% of the market and range from inexpensive lightweight , woven silt polypropylene film to complex multifilament polyester yarn fabrics , weighing up to 2000 gm per sq. m.The remaining 10% or so of the market is accounted for knitted fabrics, geogrids, geonets and erosion control mats. (33)The following section is going to focus on the four basic structures used for producing geotextiles, which are woven, nonwoven , knitted and composite fabrics