Composite Geomembrane (Geocomposite)

Product Specification

Composite Geomembrane (Geocomposite)
Product Category: Geosynthetic Barrier Systems (One Geotextile/One Membrane & Two Geotextiles/One Membrane)

Overview

A Composite Geomembrane is a high-performance engineered material that combines a impermeable geomembrane core with one or two layers of protective non-woven geotextiles. This integration creates a robust system that provides superior hydraulic barrier protection, mechanical strength, and puncture resistance.

Available in two primary configurations:

• One Geotextile/One Membrane (1G1M): Features a geomembrane laminated to one layer of geotextile. Ideal for applications requiring barrier protection with mechanical reinforcement on one side.

• Two Geotextiles/One Membrane (2G1M): Sandwiches a geomembrane between two layers of geotextile, offering enhanced protection, friction, and drainage capabilities on both sides.

These composites are widely used in environmental containment, water management, and civil engineering projects to ensure long-term, reliable performance.

Key Features & Benefits

1. Superior Impermeability

   • The geomembrane core (typically HDPE, LDPE, or LLDPE) provides an exceptional hydraulic barrier with permeability coefficients ≤1.0 × 10⁻¹² cm/s, effectively preventing fluid migration.

2. Enhanced Mechanical Protection

   • The geotextile layers protect the delicate membrane from puncture, abrasion, and installation damage. They also distribute loads more evenly, increasing system durability.

3. Improved Interface Friction & Slope Stability

   • The geotextile surfaces provide high friction angles (typically 25° - 35°) against soils and other geosynthetics, enhancing slope stability and reducing the risk of slippage.

4. Drainage and Gas Venting Capability

   • The geotextile layers act as a drainage medium, allowing lateral transmission of liquids and gases away from the membrane surface, reducing pressure buildup.

5. Cost and Time Efficiency

   • Combines three functions (barrier, protection, drainage) in a single, easy-to-install product, reducing material, labor, and construction time compared to installing components separately.

6. Chemical and UV Resistance

   • The polymer materials offer excellent resistance to a wide range of chemicals, soils, and UV radiation (when specified with carbon black), ensuring long-term performance in harsh environments.

Applications

Composite Geomembranes are the preferred solution for critical barrier applications:

• Landfill Systems: Base liners, cap liners, and leachate collection layers.

• Water & Fluid Containment: Reservoirs, ponds, canals, and irrigation ditches.

• Mining and Energy: Heap leach pads, tailings dams, and secondary containment.

• Tunnels and Underground Structures: Waterproofing for tunnels, basements, and foundations.

• Transportation Infrastructure: Subgrade protection and drainage layers beneath roads and railways.

Installation Guidelines

1. Subgrade Preparation: The foundation must be smooth, compacted, and free of sharp rocks, debris, or protruding objects.

2. Panel Deployment: Unroll panels across the prepared subgrade. For slopes, unroll along the contour (not up and down).

3. Panel Joining: Adjacent panels are typically joined using dual-track fusion welding for the geomembrane core, creating a continuous, leak-proof seam. The overlapping geotextiles are not welded.

4. Anchoring: Secure the liner in anchor trenches at the top of slopes or perimeter.

5. Covering: Backfill with specified soil or aggregate carefully to avoid damaging the composite liner.

Why Choose Our Composite Geomembrane?

• Certified Quality: Manufactured to meet or exceed ASTM, GRI-GM13, and other international standards.

• Customization: We offer a wide range of geomembrane thicknesses, geotextile weights, and roll dimensions to perfectly suit your project's design requirements.

• Technical Expertise: Our engineering support team can provide design consultation and installation guidance to ensure optimal performance.

FAQ

Q: What is the main difference between 1G1M and 2G1M?
A: 1G1M provides protection and friction on one side and is often used against a stable structure (like a concrete wall). 2G1M provides protection and drainage on both sides and is used between two soil layers or on slopes for increased stability.

Q: Can the composite be seamed on-site?
A: Yes, the impermeable geomembrane core is seamed using standard thermal fusion methods. The non-woven geotextile layers are not seamed but are overlapped.

Q: What is the typical lifespan?
A: When properly installed and protected, HDPE-based composite liners can have a service life exceeding 100 years.

Q: How is it different from a standalone geomembrane?
A: A standalone geomembrane requires separate protective layers (e.g., geotextiles, soil) to be placed on both sides. The composite comes with these layers pre-laminated, saving installation time and ensuring consistent quality.

Ordering Information

• Packaging: Supplied in robust rolls, wrapped for protection during shipping and storage.

• Roll Dimensions: Standard widths from 2.0m to 8.0m. Standard roll lengths are typically 50m or 100m.

• Lead Time: Dependent on quantity and customization, typically 2-4 weeks.

Contact Us today for a quotation, technical data sheets, or project-specific design support.