WHAT ARE BENTONITE BARRIERS (GCLs)?
The Geosynthetic Clay Liner (GCL) is an artificial hydraulic barrier with low hydraulic conductivity, having an active principle; it is self-sealing and self-repairing, composed of a layer of sodium bentonite supported between two layers of geotextiles or a geomembrane layer, bonded together by needling or chemical adhesives. Its main function is to contain materials and/or substances, and the GCL can replace the compacted clay layer.
APPLICATIONS OF BENTONITE BARRIERS (GCL)
Primary Containment
• Water Reservoirs• Decorative Lakes
• Dams Foundations.
Secondary Containment.
• Landfills• Final Disposal Sites for Industrial Waste
• Leachate Ponds and Pits
ADVANTAGES OF BENTONITE BARRIERS (GCL)
• Cost Reduction.• Low Installation Cost; easy and quick to install.
• No material hauling from a bank to the site is required.
• No compaction is required.
REINFORCED GCLs
These are GCLs where the geotextile layers are interlocked by needling, thus increasing their strength.
Physical characteristics
• Bentonite encapsulated between two non-woven geotextiles, bonded by needling.
• Bentonite encapsulated between two geotextiles; one non-woven and one woven, bonded by needling.
• Bentonite with geomembrane, bonded by needling.
NO REINFORCED GCLs
These are GCLs where the bentonite contains an adhesive that bonds the layers of non-woven geotextile or geomembrane.
Physical characteristics
• Bentonite encapsulated between two non-woven geotextiles bonded by an adhesive.
• Bentonite with geomembrane bonded by an adhesive.
TECHNICAL SPECIFICATIONS
Regulations:
Manufacturers and designers adhere to what is established by the Geosynthetic Institute (GSI) in their GRI specifications; GCL-3 GCL and GCL-5 GCL, Design Guide.
Bentonite Content:
2.4 kg/m², 3.6 kg/m²
Non-Woven Geotextile:
3 oz, 6 oz
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