Geocomposites, by their very nature are derived from a thoughtful combination of Geotextiles, Geogrids, Geonets and/or Geomembranes in a factory fabricated unit. Any one of the above four Geosynthetics products can be combined with some other synthetic material (like deformed plastic sheets or steel cables or even with soil) to bring out the best creative efforts of the engineer and the manufacturer, in an optimal manner and at minimum costs.
Geocomposites are pre-fabricated drainage products which directly replace conventional granular fill. They normally con- sist of at least two different components; a three dimensional polymer core, which acts as the transport medium, and a Geo- textile filter fabric which allows liquids to pass into the core but prevents the surrounding fill from washing in and clogging the core.Their application areas are numerous and constantly growing. The major functions performed by Geocomposites are separation, reinforcement, filtration, drainage, and con- tainment.
Geotextile – Geonet Composites
Widely used and commonly known as drainage Geocom- posites, these are formed when a Geotextile is used on one or both sides of a Geonet. These Geocomposites are effec- tive in intercepting and conveying leachate in landfill liner and cover systems and for conducting vapor or water be- neath pond liners of various types.
Goetextile – Geomembrane Composites
Geocomposites comprising bonded Geomembranes and Geotextiles offer advantages over unbounded composites. These composites have improved mechanical properties, including interface friction, over a Geomembrane alone and also have the ability to dissipate gases or pore water pressures.
Geomembrane – Geogrid Composites
Geomembranes and Geogrids made from the same mate- rial (e.g., high-density polyethylene) can be welded to form an impervious barrier with enhanced strength and friction capabilities.
Geotextile – Geogrid Composites
Those Geotextiles with low modulus, low strength and/or high elongation at failure can be great- ly improved by forming a composite material with a Geogrid, or even with a woven fabric scrim.
Geosynthetic – Soil Composites
As typified by the Geosynthetic clay liners, many other variations of Geosynthetic products and soil can be developed. Another variation is to use continuous polymer fibres and sand to form a steep slope with excellent strength properties. The fibres give the composite material a very pronounced apparent cohesion.
Advantages of Geocomposites:
- Provides and maintains high volume flow-path for water and gases, maintaining soil integrity
- Filtration properties suitable for most backfill types
- Highly cost-effective replacement to conventional materials
- High drainage efficiency
- Reduction of materials installation time
- Durability and period extension of structures under construction
- Offer consistent performance
- Minimizes the environmental impact of construction by replacing bulkier materials
Application areas of Geocomposites:
A choice of Geocomposites can be used for the reinforcement of ground, road bases and road bitumi- nous surfaces. Geocomposite drains are used extensively in a number of applications within highway projects. They offer significant savings to the contractor in terms of both cost and time. Geocomposite drains directly replace traditional stone drainage designs. They are used in vertical drains running par- allel to the road to maintain the desired moisture content within the base and sub-base layers.
Geocomposites are useful in the drainage of airport and railway bases.
Efficient and robust drainage systems are necessary to encounter the water seepage problem in tunnel construction. Geocomposites intercept groundwater seepage between the rock face and the concrete tunnel lining which is then transported to a perforated drainage pipe.
Effluent treatment plant
Gas removal from covered waste dumps is possible through Geocomposites. Installing a Geocomposite between the primary and secondary liners form an effective leak detection system that not only de- tects the leak but has the capacity to collect the discharge until the leak is repaired. Geocomposites installed over contaminated soils and below the clean fill, form a barrier for the contaminated water to rise to the soil. They also form a horizontal drain that permits the lateral drainage of infiltrated rainwater.
Municipal and Hazardous Waste Landfills
Horizontal drainage in landfill sites is possible through Geocomposites. By replacing the traditional stone layer with a Geocomposite, more volume for the waste is created within the landfill. Geocom- posites installed beneath the basal lining system will form an effective drainage path for groundwater.
Stadiums and Golf Courses
Geocomposites can be used for the reinforcement of ground in stadiums and golf courses.