Natural Sodium Bentonite Core 4-6m Geosynthetic Clay Liner for Hydraulic

Product Specification

Our Bentonite Waterproofing Blanket (GCL), also known as a Geosynthetic Clay Liner, is an advanced, factory-manufactured composite barrier system. It combines high-swelling sodium bentonite clay with durable geotextiles and/or geomembranes to create a highly effective, self-sealing hydraulic barrier. Engineered for simplicity, reliability, and cost-efficiency, it outperforms traditional compacted clay liners (CCLs) in a wide range of environmental and civil engineering containment projects.

Key Features & Benefits

1. Exceptional Self-Sealing Hydraulic Barrier:

   • High-Swelling Sodium Bentonite Core: When hydrated, the bentonite swells to form a dense, low-permeability gel (≤ 5 x 10⁻¹¹ m/s or lower - insert specific test data), effectively sealing around punctures and minor imperfections.

   • Seams & Puncture Self-Repair: Unique self-healing capability minimizes leakage paths at overlaps and around penetrations.

2. Robust Composite Structure:

   • Reinforced Core Design: Bentonite is securely needle-punched between high-strength woven and/or nonwoven polypropylene geotextiles (or bonded to a geomembrane), ensuring integrity during installation and service life.

   • Superior Shear Strength: Needle-punching creates fiber reinforcement throughout the bentonite core, providing high internal and interface shear strength critical for slope stability (Peak Shear Strength: XX kPa @ Y kPa normal stress - insert specific data).

   • High Tensile Strength: Resists handling and installation stresses (Grab Strength: ≥ XX N - insert specific data).

3. Unmatched Performance & Reliability:

   • Low Permeability: Consistently achieves permeability coefficients (k) ≤ 5 x 10⁻¹¹ m/s or lower after hydration and consolidation under relevant stresses (e.g., 50 kPa).

   • Chemical Compatibility: Tested for compatibility with various leachates and site-specific fluids. (Specify standard tests passed or provide data).

   • Freeze-Thaw & Wet-Dry Cycle Resistance: Maintains low permeability even after repeated cycles (ASTM D6088).

   • Long-Term Durability: Bentonite is a naturally stable mineral; geotextiles are UV-stabilized for exposed periods and resistant to biological/chemical degradation.

4. Significant Project Advantages:

   • Cost Savings: Typically 30-70% less expensive than compacted clay liners (CCLs) of equivalent performance, saving on material, placement, compaction, and quality control costs.

   • Rapid Installation: Lightweight rolls (typically 35-45 kg/m³) are easy to handle, deploy, and seam (simple overlap). Installation rates are 5-10 times faster than CCLs.

   • Space Efficient: Thin profile (approx. 6-10 mm dry, swells to ~12-15 mm hydrated) saves valuable airspace in landfills and reduces excavation volumes.

   • Consistent Quality: Factory-controlled manufacturing ensures uniform bentonite distribution, mass per unit area, and strength, eliminating variability common in natural clay sources.

   • Environmental Sustainability: Reduces excavation of natural clay resources; lower carbon footprint due to reduced transport and earthworks.

   • Performance in Challenging Conditions: Excellent solution for areas with poor native clay soils or limited access.

Applications

• Primary & Secondary Landfill Liners: Base liners, cover systems, leachate ponds, caps.

• Containment Facilities: Industrial waste lagoons, secondary containment for tanks, brine pits, coal ash ponds, heap leach pads.

  • Tunnel & Underground Structures: Waterproofing membranes (behind segmental linings, cut-and-cover).

• Water & Liquid Storage: Reservoirs, irrigation ponds, decorative lakes, canals, aquaculture ponds.

• Infrastructure: Highway and railway embankments (as capillary break/moisture barrier), beneath pavements.

• Green Roofs & Plaza Decks: Root-resistant waterproofing layer.

• Remediation: Capping and lining for contaminated sites.

Technical Specifications

• Structure: Needle-Punched Reinforced (Standard). Optional: Adhesive Bonded (for higher strength), Geomembrane-backed (GCL-GM)

• Bentonite Type: High-Purity, High-Swelling Sodium Bentonite

• Bentonite Mass: [e.g., ≥ 3.6 kg/m² (Standard), 4.0 kg/m², 4.5 kg/m², 5.0 kg/m² (Heavy Duty)] (Specify available grades)

• Carrier Geotextile: Woven Polypropylene (High Strength)

• Cover Geotextile: Nonwoven Polypropylene (Filtration/Protection)

• Roll Dimensions: Width: [e.g., 4.0 m, 4.8 m, 5.0 m]; Length: [e.g., 30 m, 45 m, 60 m] (Specify standard sizes)

• Hydraulic Conductivity (Permeability): ≤ [e.g., 5 x 10⁻¹¹ m/s] (Provide specific tested value @ relevant stress, e.g., 50 kPa)

• Swell Index: ≥ [e.g., 24 mL/2g] (ASTM D5890)

• Fluid Loss: ≤ [e.g., 18 mL] (API 13A)

• Tensile Strength (MD/CMD): ≥ [e.g., MD: 25 kN/m, CMD: 20 kN/m] (ASTM D6768)

• Peak Shear Strength: ≥ [e.g., 35 kPa @ 50 kPa normal stress] (ASTM D6243/D5321)

• Grab Strength: ≥ [e.g., 900 N] (ASTM D4632)

• Mass per Unit Area (Total): [e.g., ≥ 4000 g/m²] (Specify)

• Thickness (Dry): [e.g., 7 mm ± 1 mm] (Specify)

• UV Resistance: [e.g., ≥ 6 months with < 20% strength loss] (ASTM D4355) (Specify)

• Standards Compliance: ASTM D5889, GRI-GCL3, EN 13493, or other relevant national/international standards. (Specify applicable standards)

Why Choose Our Bentonite Waterproofing Blanket?

• Proven Hydraulic Performance: Rigorously tested in independent laboratories to meet or exceed stringent permeability requirements.

• Engineered for Strength: Needle-punched reinforcement provides critical shear strength for slope stability.

• Consistent Quality Control: Every roll manufactured under strict protocols ensuring uniform bentonite distribution and mass.

• Technical Support: Expert guidance on product selection, specification, design, and installation best practices.

• Global Reliability: Trusted performance in diverse climates and challenging projects worldwide.

• Sustainable Solution: Contributes to reduced environmental impact and resource conservation.

Installation Best Practices (Overview)

1. Subgrade Preparation: Smooth, compacted surface free of sharp rocks, debris, and standing water. Achieve specified compaction.

2. Roll Placement: Unroll blankets perpendicular to slope direction. Maintain minimum overlaps ([e.g., 150mm - 300mm] Specify) with bentonite granules or powder applied generously in the overlap zone.

3. Anchoring: Secure blanket at top of slopes and around penetrations/structures as per design.

4. Coverage: Cover promptly (typically within 48 hours of exposure) with specified protective soil layer (minimum [e.g., 300mm]) or other designated material. Place cover material carefully to avoid damage.

5. Seaming: Ensure adequate bentonite in overlaps; mechanical stitching or adhesive bonding may be specified for critical applications or steep slopes.