Geocomposites geotextiles

Gas collection/Removal Sand or gravel Geonet or geocomposite Geotextile Recycled or reused waste (e.g., tire chips)... 

From the wide range of geosynthetic products, the ones used in asphalt rehabilitation works are the geotextiles, geogrids and geocomposites, all able to sustain the high temperature of the asphalt during application. 

With respect to choosing between geotextile and geocomposite material, it is advised to... 

Key words geosynthetics, geotextiles, geocomposites, structures, properties, functions, multifunctionality, applications. 

Figure 8.1 indicates that geotextile structures include continuous sheets of non-woven, woven, and warp knitted fabrics, and stitch-bonded fibres or yams. The woven and warp knitted materials can be made to have a similar structure to certain of the textile-related products (essentially geogrids) to be used as alternatives. The non-woven geotextiles can be combined with the textile-related structures to make geocomposite products that are multifunctional. 

The approach of multilayering of coarse and fine fibres has also been applied for enhanced drainage functionality. One development is a three-layer non-woven geotextile which is claimed to give a better performance than drainage geocomposites with a geonet core. The three-layer non-woven... 

Fischer, G. R., Holtz, R. D. and Christopher, B. R. (1996), Characteristics of Geotextile Pore Structure , Recent Developments in GeotextUe Filters and Prefabricated Drainage Geocomposites, Bhatia, S. K. and Suits, L. D., Editors, ASTM Special Technical Publication 1281. Proceedings of a Symposium Field in Denver, Colorado, USA, June 1995, pp. 3-18. 

Drainage or fluid transmission Allowing water (or vapour) to be transmitted in the plane of a thick nonwoven needle-punched geotextile or a drainage geocomposite. 

A parameter for in-plane permeability of a geotextile or drainage geocomposite. 

Table 3.5. Transition temperatures (in °C) of thermoplastic materials used for geosynthetics (geomembranes, nonwoven geotextiles, geocomposite drains, geogrids etc.). In addition to polyolefins PE and PP, polyester PET and polyamides PA 6.6 and PA 6 and polyvinyl chloride PVC are also used, the letter, however, only to a small extent...

---