Products : Geosynthetic Clay Liners (GCLs)

BENTOFIX® X geosynthetic clay liners (GCLs)

Bentofix® X – also known as geosynthetic clay barriers (GBR-C) – are needle-punched, reinforced composites that combine two durable geotextile outer layers and a uniform core of high-swelling powder sodium bentonite clay, with an additional polyethylene extrusion-coated barrier. This forms a uniform, multi-directional, shear-resistant, hydraulic, multi-component barrier with self-sealing and re-healing characteristics.

Bentofix® geosynthetic clay liners (GCL) exemplify how geosynthetics perform best: by interacting with natural elements to create something stronger or more secure.

Needle-punching revolutionised

The needle-punched manufacturing technology greatly increased the internal and external shear strength of GCLs and expanded the range of applications in which GCLs could be used. The needle-punching process firmly bonds the three unique layers of Bentofix® – two outer encapsulating geotextiles and the core of sodium bentonite. This bond creates a single, engineered barrier that utilises the best of both synthetic and natural materials.

The Power of Powder Bentonite

Bentofix® GCLs outperform significantly thicker layers of compacted clay. The exceptional, immediate swelling characteristic of powdered sodium bentonite provides a long-term barrier that can “self-seal and re-heal” (e.g. swell to fill potential punctured/damaged zones) and rehydrate to renew the barrier even if it has been exposed to desiccation. The highly engineered geotextile outer layers provide outstanding protection against piping of the bentonite, durability to resist damage, and strength to manage the challenges inherent in barrier designs, such as for security on slopes and against fluctuating heads.

Bentofix® X Coating the add-on value

The polyethylene coating is attached uniform and firmly onto the woven Bentofix® X component creating a durable bond with the needle-punched fibres. This ensures a very high fibre pull-out resistance and increases the long-term internal shear strength.

The Bentofix® X polyethylene extrusion coating ensures an immediate and enhanced barrier to gas and radon while protecting against desiccation and critical substances. In applications with high hydraulic gradients over coarse soils the additional Bentofix® X coating prevents bentonite piping. In other applications the barrier acts as a possible root barrier.

Advantages of needle-punched, PE-coated Bentofix® X

  • Versatile sealing applications possible
  • Immediate sealing and long-term performance with high-swelling sodium bentonite powder and durable PE coating
  • Desiccation barrier
  • Protection against ion exchange
  • Barrier against roots
  • Gas and radon barrier
  • Improves the protection against bentonite erosion from high water pressures and gravelly subsoils
  • Direct coverage with concrete and lime possible
  • Shear resistant overlapping possible with special adhesive tapes
  • Cost-saving alternative to compacted clay
  • Robust and durable geosynthetics encapsulate the bentonite sealing core
  • The uniform needle-punching improves multi-directional shear strength and internal friction angle
  • Self-sealing length overlaps; with BFG types all overlaps self-seal
  • Quick, easy and cost-efficient installation

 

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