Product Overview

The Needle-punched Bentonite Geosynthetic Clay Liner (GCL) is a composite geosynthetic material made by embedding sodium bentonite clay between two layers of nonwoven geotextiles using a needle-punching process. This process enhances the mechanical properties of the liner, providing increased tensile strength, tear resistance, and durability. The bentonite clay forms an impermeable barrier when hydrated, effectively preventing water and contaminants from leaking through, making it an ideal solution for various environmental containment applications.

Product Features

• Enhanced Strength and Durability: The needle-punched process increases the GCL's tensile strength, tear resistance, and dimensional stability, making it more durable and reliable under mechanical stresses.
• Superior Waterproofing: The bentonite clay layer swells and seals when in contact with water, creating a highly effective, self-healing barrier against water leakage.
• Self-Healing Properties: Any minor punctures or damage to the liner are sealed automatically by the swelling of the bentonite clay, ensuring long-term performance and security.
• Chemical Resistance: The GCL is highly resistant to a wide range of chemicals, making it suitable for use in landfills, hazardous waste containment, and other challenging environments.
• Cost-Effective and Sustainable: The material is eco-friendly, made from natural components, and offers a cost-effective solution compared to traditional clay or synthetic liners.

Product Specifications

• Material Composition: Sodium bentonite clay encapsulated between two layers of needle-punched nonwoven geotextiles, providing strength, permeability control, and mechanical reinforcement.
• Thickness: Typically, the bentonite layer is 5mm to 10mm thick, while the overall GCL thickness is generally between 8mm and 15mm, depending on the project specifications.
• Width: Available in rolls up to 6 meters wide, ideal for large-scale projects such as landfills and reservoirs.
• Permeability: The GCL has a permeability coefficient of 10^-9 cm/s or lower, ensuring excellent leakage prevention and water containment.
• Tensile Strength: The tensile strength typically ranges from 8-20 MPa, depending on the geotextile reinforcement and application requirements.
• Weight: Generally weighs between 4 to 5 kg/m², making it lightweight and easy to handle during transportation and installation.

Applications

• Landfills: Used as a primary liner material in municipal and industrial landfills to prevent the leakage of leachate and harmful chemicals into the environment.
• Water Containment: Suitable for lining ponds, artificial lakes, reservoirs, and other water containment applications, ensuring long-term water retention.
• Hazardous Waste Containment: Ideal for hazardous waste sites, offering high chemical resistance and preventing leachate from contaminating soil or groundwater.
• Mining: Employed in mining applications like tailings dams, heap leach pads, and mining waste containment to reduce environmental impact and protect surrounding ecosystems.
• Wastewater Treatment: Used to line treatment ponds, lagoons, and basins, ensuring containment and preventing seepage into the environment.
• Soil and Groundwater Protection: Applied in projects requiring soil remediation or protection of groundwater resources from contamination.

Construction Recommendations

1. Site Preparation: Ensure the installation site is free of sharp objects, debris, or large rocks that could puncture or damage the liner. The surface should be smooth, clean, and compacted to provide stable support for the GCL.

2. Installation Method: Lay the Needle-punched Bentonite GCL in a uniform, wrinkle-free manner. Overlap adjacent sections by at least 15-30 cm and ensure proper alignment. Avoid excessive stretching or tensioning of the material during installation.

3. Seam Sealing: Seams should be securely stitched or adhered using suitable methods. The GCL’s overlaps should be well-sealed to prevent any leakage through the joints. Depending on the application, a geomembrane can also be used for added protection.

4. Protection During Installation: Avoid walking directly on the GCL, especially with sharp objects or heavy boots, as they could puncture the material. Use soft equipment or padding if necessary when handling the GCL.

5. Backfilling: After installation, cover the liner with a protective layer of soil or gravel as soon as possible to shield it from UV radiation and environmental wear. This also helps to anchor the GCL in place and prevent displacement.

6. Quality Control: Regularly inspect the liner for any damage during and after installation. Perform permeability tests and seam integrity checks to ensure that the GCL meets performance expectations.