Geotextile
Geotextiles are one of the biggest groups of Geosynthetics. In fact, they are fabrics which are made by artificial fiber not natural one such as cotton, wool…, and based on polymers. As a result, woven and non-woven Geotextiles are robust and durable. These flexible, spongy, artificial fibers are manufactured by special textile machinery. The most common types of geotextiles are woven and non woven.Usage of geotextile
1. Separation Geotextiles will prevent two soil layers of different particle sizes from mixing with each other, as the image illustrates below. 2. Drainage Geotextiles will efficiently collect superfluous water from structures, such as rainwater or surplus water, from the soil and discharge it. 3. Filtration Geotextiles are an ideal interface for reverse filtration in the soil adjacent to the geotextile. In all soils water allows fine particles to be moved. Part of these particles will be halted at the filter interface; some will be halted within the filter itself while the rest will pass into the drain. The complex needle-punched structure of the geotextile enables the retention of fine particles without reducing the permeability of the drain. 4. Reinforcement Heavy geotextiles can be used to reinforce earth structures by means of fill materials. Thanks to their high soil fabric friction coefficient and high tensile strength, they are an ideal reinforcement solution. 5. Protection Geotextiles are an ideal protection from erosion of earth embankments by wave action, currents or repeated drawdown. A layer of geotextiles can be placed so as to prevent leaching of fine material. They can be used for rock beaching or as mattress structures. They can even easily be placed under water.Specification of geotextile
| Characteristics | Test method | Unit | |||||
| Mass per unit area | ASTM D5621 | g/m2 | 150 | 260 | 410 | 610 | 700 |
| CBR test | ASTM D6241 | N | 1/690 | 4/005 | —- | —- | —- |
| Tensile strength | ASTM D4632 | KN/m | —- | 72 | 90 | 140 | 180 |
| Elongation | ASTM D4595 | % | 15 | 12 | 10 | 10 | 10 |
| Characteristic opening size total O90 | ASTM D4751 | mm | 0/480 | 0/460 | 0/460 | 0/425 | 0/425 |
| Permittivity | ASTM D4491 | Sec-1 | 0/05 | 0/05 | —- | —- | —- |
| Water Flow Rate | ASTM D4491 | L/min/m2 | 160 | 163 | —- | —- | —- |