Geocomposite Clay Liner
The bentonite layer is typically sodium-based clay with high swelling capacity. It is confined within geotextiles using a needle-punched reinforcement process, forming a composite barrier system.
Description
Technical Parameters
Geocomposite clay liner (GCL) is a geosynthetic hydraulic barrier composed of a sodium bentonite core encapsulated between two geotextile layers.
The bentonite layer is typically sodium-based clay with high swelling capacity. It is confined within geotextiles using a needle-punched reinforcement process, forming a composite barrier system.
Upon hydration, the bentonite absorbs water and expands significantly, filling voids and interstices within the system. This swelling behavior provides a self-sealing hydraulic barrier function, effectively reducing permeability to extremely low levels.
Self-Sealing Mechanism and Hydraulic Performance
When exposed to water, the sodium bentonite core swells from approximately 5 mm to 12–15 mm, forming a dense, low-permeability sealing layer.
This swelling action enables the system to self-seal minor punctures and small defects, significantly reducing the risk of fluid migration.
The GCL system is widely used in landfill liners, pond lining systems, and below-grade waterproofing applications such as basements and containment structures.
Installation Method and System Requirements
The geocomposite clay liner is installed by direct unrolling over prepared subgrade surfaces.
No adhesives or thermal welding are required.
At overlap joints, additional bentonite granules are applied to enhance sealing performance.
The system must be promptly covered with soil, sand, or concrete protection layers to prevent moisture loss from the bentonite core.
Prolonged exposure to sunlight prior to coverage may result in dehydration of the bentonite, which can reduce swelling performance.
Once hydrated and confined, the system maintains long-term hydraulic sealing capability.
Environmental Conditions and Performance Range
The system is suitable for a wide temperature range from -30°C to +80°C.
It performs effectively in buried conditions where continuous hydration is maintained.
Manufacturing Capability and Quality Assurance
Our factory has over 12 years of experience in geosynthetic waterproofing materials. We operate ISO9001-certified production systems with in-house laboratory testing.
We are a specialized and innovation-oriented manufacturer and provide OEM services, free samples, third-party inspection support, and a 1-year warranty.
Each roll is fully inspected prior to shipment.
The minimum order quantity is 100 square meters per specification.
Technical Parameters
|
Parameter |
Value |
|
Product Code |
JRJH-GCL-023 |
|
Material |
Sodium bentonite + geotextile (nonwoven/woven composite) |
|
Sodium Bentonite Content |
≥90% |
|
Swell Index |
≥24 mL/2g |
|
Thickness |
5–7 mm (dry state), 12–15 mm (hydrated) |
|
Width |
2 m / 3 m / 4 m / 6 m |
|
Roll Length |
20 m / 30 m / 50 m |
|
Tensile Strength |
≥600 N/100 mm |
|
Elongation |
≥10% |
|
Temperature Range |
-30°C to +80°C |
|
Hydraulic Resistance |
0.4 MPa (1 hour, no leakage) |
|
MOQ |
100 m² per specification |
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