Geosynthetics
GCL Clayliner
Geosynthetic Clay Liner (GCL)
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A Geosynthetic Clay Liner (GCL) is an advanced engineering material composed of sodium bentonite clay combined with geotextile layers, typically made from synthetic fibers like polypropylene or polyester in woven or nonwoven forms. This composite structure offers an efficient and reliable solution for waterproofing and containment applications.
Sodium bentonite, the key component, swells upon contact with water, creating a highly impermeable barrier. This swelling property makes bentonite clay ideal for sealing and waterproofing needs in various civil and environmental engineering projects.
GCLs are manufactured by sandwiching or encapsulating the sodium bentonite layer between geotextile fabrics. This design preserves the swelling characteristics of the bentonite while providing structural strength and mechanical support through the geotextile layers.
When hydrated, bentonite clay can absorb up to approximately 17 times its dry weight in water, forming a tight, impermeable seal. It also demonstrates excellent resilience by shrinking back upon drying, allowing for repeated swelling and shrinking cycles without compromising long-term waterproofing performance.