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Geosynthetic Clay Liners (GCL)

Geosynthetic clay liners (GCL) is used across a range of civil engineering and building applications. It contains the clay mineral sodium bentonite - a natural sealant that swells on contact with water - and is sandwiched between two layers of geotextiles, a woven and a nonwoven, that are mechanically needle-punched together to provide shear strength.

Our top-performing, self-sealing and self-healing clay liners, comply with the latest industry codes of practice. The perfect solution for where containment is required to act as a hydraulic barrier to leachate from landfill sites or as a SUDs pond liner.

GCL 4500
Geosynthetic clay liner

GCL 4500 is a woven fabric-like material, primarily used as a fluid barrier for use in the construction of liquid waste disposal sites. The granular bentonite clay is sandwiched between a woven and nonwoven geotextile, resulting in a very strong robust product.

AREAS OF USE

  • Solid waste and hazardous waste landfill areas
  • Ponds and pools
  • Dams
  • Irrigation channels and water transfer lines
  • Landslide repairs and similar ground reinforcement applications
  • Base insulations in flood controls

Functions of geosynthetic clay liners

Containment

Prevents the migration of liquids through the soil.

GCL 4500 Specification

Properties of Geotextile

Test method Values Unit Test frequency
Non-Woven Mass/Unit Area EN ISO 9864 (EN965) ≥ 200 g/m2 Certified by supplier 
Woven Mass/Unit Area EN ISO 9864 (EN965) ≥ 100 g/m2 Certified by supplier 

Properties of Bentonite

Test method Values Unit Test frequency
Free Swell ASTM D 5890 ≥ 25 ml/2g 5000m²
Fluid Loss ASTM D 5891 ≤ 18 ml 5000m²
Smectite (Di)/Montmorillonite content (10) XRD 80 % Certified by supplier

Geosynthetic Clay Liner Specification

Test method Values Test frequency
Index Flux q10 ASTM D 5887/EN 16416 5.0 x 10⁻⁹ (m³/m²)/s Production Week
Hydraulic Conductivity k10 ASTM D 5887/EN 16416 ≤ 2.5 x 10⁻¹¹ m/s Production Week
Total Mass/Unit Area EN 14196 ≥ 4.80 kg/m² 5000m²
Bentonite Mass/Unit Area EN 14196 ≥ 4.50 kg/m² 5000m²
Tensile Strength MD/CMD EN ISO 10319 11.0/11.0 kN/m 5000m²
Elongation at Break MD/CMD EN ISO 10319 approx 15/10 % 5000m²
Puncture Resistance (CBR) EN ISO 12236 1.8 kN 5000m²
Average Bonding Peel Strength ASTM D 6496 ≥ 400 N/m 5000m²
Thickness EN ISO 9863-1 approx 7.0 mm 5000m²
Typical Roll Length x Width - 40.0 x 5.0 m Continuous

(1) At 12% moisture content
(2) Max peak

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