Geomembrane comprising a unitary structure fabricated by co-extrusion including a center core, a thermoplastic adhesive layer secured on one side of the center core, and a textured layer secured on the opposite side of the center core. The geomembrane is utilized in the manufacture of a liner for earthen constructions by employing the thermoplastic layer of the geomembrane to secure the geomembrane to a geosynthetic clay liner.
Ground water contamination is a primary environmental concern. One method of controlling ground water contamination comprises the lining of landfills, canals, ponds, and similar earthen constructions with a liner comprising a geosynthetic clay liner and an underlying geomembrane. In this manner seepage from the lined construction into the underlying ground water is prevented.
More particularly, liners for landfills, canals, ponds, and similar earthen constructions may comprise a layer of bentonite. The upper surface of the bentonite layer is secured by a layer of woven polypropylene. A layer of non-woven polypropylene textile is positioned below the bentonite layer. A geomembrane is secured to the lower surface of the non-woven polypropylene textile which may be provided with a textured lower surface to prevent shifting of the liner relative to the underlying construction.
Heretofore the fabrication of liners in which a geomembrane is secured beneath a geosynthetic clay liner has been complicated by the necessity of applying a glue layer to the upper surface of the geomembrane in order to secure the geomembrane to the geosynthetic clay liner. The application of the glue layer has required a separate manufacturing step which has typically been carried out at a remote location. The cost of manufacturing the liner is therefore substantially increased.
Usage of geomembrane
Using water tanks in order to prevent waste and contamination of reservoirs
Using water tanks in order to prevent pollution of environment and the groundwater.
Isolate underground concrete structures in order to protect against moisture and corrosive substances
Use as an insulator in water storage pool
Using as insulator in artificial lakes
Coating of artificial wetlands and lakes
Coating of fish and shrimp ponds
Coverage of urban sewage treatment lagoons and industrial effluents
Coating chemical storage tanks
Cover tunnels and subway transit vehicles
Covering Water and sanitation Channels
Using in the context of roads and railway lines
Using In areas where insulation is needed
Use to create an impenetrable covering waste in landfills
Using In the process of leaching of minerals
Covering the floor and walls of fuel tanks
Coating of evaporation ponds
In order to prevent water penetration into the building foundation
Benefit of using Geomembrane
Long life
Tests have shown that geomembrane or the mechanical strength of the geomembrane and other have kept its properties in the way of permeability and technical specifications after exposure to the existing wastewater in waste tanks for 10000 hours in temperature 70 centigrade and for this reason the very large of life and of dis kind copy of coatings in tanks Landfill Geomembrane is approved and recommended.
High environmental resistance
The Geomembrane can be used without embrittlement or brittle at very low temperatures or reduced tensile strength and relaxation at high temperatures.
Mechanical strength
It guarantees high tensile strength PE balance of power and appropriate deformations specially in conditions of asymmetric meeting and ability to increase the high length of Geomembrane without rupture provides the possibility of coordination and matching liner with roughness of lower surface without reduction the impermeability and its destruction.
Resistance to corrosive substances
Geomembrane is resistant against various chemical solutions for two major reasons fist Because the family of ethylene polymers are chemically neutral in which do not participate in chemical reactions second, due to the concentration and density of the constituent chains has high the impermeable and does not allow penetration of chemicals into their structure.
Resistance against UV radiation
Some Factors such as sunlight or ultraviolet radiation and ozone can cause a significant reduction in the mechanical resistance of the material to be exposed to radiation of sun by adding some black carbon
to PE materials can achieved to an excellent resistance. Besides its 30-years history of Geomembrane in different weather condition around the world, some open trials have been done in which confirm high durability of Geomembrane in compression of time.
Resistance against biological attacks, plants growing and rodents attack
– Micro-organisms, rodents and roots can cause damage to the waterproof coating so the one of the most important choices in impermeable Geomembrane liner is lack of sensitivity to the above factors
– Health and safety of water in contact with Geomembrane
– Geomembrane Is suitable for drinking water as its polymeric compounds as a result has no effect on the water
Dimension and packing of Geomembrane
thickness: 0.8 mm to 2.5mm
width: up to 7 meters
length: depends on customer demand
