Geosynthetic clay liner (GCL)

Bentofix®

BENTOFIX® geosynthetic clay liners 2019-05-31T14:00:51+00:00

Geosynthetic clay liner (GCL) Bentofix®

Bentofix® Thermal Lock geosynthetic clay liner (GCL) – 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. This forms a uniform, multi-directional, shear-resistant hydraulic barrier with self-sealing and re-healing characteristics.

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

Advantages of the geosynthetic clay liner Bentofix®

  • Versatile sealing applications possible
  • Excellent sealing efficiency due to high swellable sodium bentonite powder
  • Immediate sealing and long-term performance with sodium bentonite powder
  • More cost-effective and withstands differential settlement better than compacted clay liners
  • Robust geotextiles encapsulate and contain the bentonite
  • Uniform needle-punching provides multi-directional shear strength
  • Self-sealing length overlaps; with BFG types all overlaps self seal
  • Thermal Lock process increases internal shear strength and interface friction angles
  • Installation advantages with up to 5.0m wide rolls
  • Quick, easy and cost effective to install

Selected advantages of Bentofix®

ADVANTAGE 1
Bentofix. Thermal Lock replaces other geosynthetic clay liners as well as other soil barriers on steep side slopes and assures low permeability without sacrificing slope stability. Explanation: Bentofix. is uniformly needle-punched with over 2 million fibres/m2. This results in a uniform, directionally-independent shear stress transfer. Thermal Lock additionaly improves the pull-out resistance and the interface friction.

ADVANTAGE 2
Bentofix® acts immediatetly as a sealing element. The explanation: high-swelling bentonite powder, uniformly distributed bentonite powder, large bentonite swelling surface and smaller air voids to close.

ADVANTAGE 3
Bentofix® geosynthetic clay liners utilises the advantages of three high-performance components in one geocomposite:

(1) The nonwoven protects against installation stress and increases the interface friction performance.
(2) The bentonite powder acts as an immediate barrier.
(3) The slit-film woven gives the product the dimension stability and makes the product stable for installation handling. The result of this trio, combined with the needle-punching and Thermal Lock: a durable, low-permeable sealing system.

Bentofix® geosynthetic clay liners sealing applications:

  • Landfill caps, closures and base seal
  • Environmental protection under roads, railways, airports
  • Dams and dykes
  • Water containment and pond applications
  • Structural waterproofing
  • Secondary containment
  • Mining applications
  • Tunnels

Better geosynthetic clay liner advantages by needlepunching

The needle-punched manufacturing technology greatly increases the internal and external shear strength of GCLs and expands the range of applications in which GCLs can be used. The needlepunching process firmly bonds the three unique layers of Bentofix® geosynthetic clay liner – 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.

Bentofix® geosynthetic clay liner (GCL) 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.

The Thermal Lock process permanently locks the needle-punched fibres of the nonwoven geotextile layer with the Bentofix® carrier layer of GCL-types without PE coating and improves the hydraulic conductivity performance at low confining stresses. It also increases the pullout resistance of the fibres – adurability-improving measure that increases interface friction, ensures long-term shear resistance and immediate fibre-strength during hydration.

BENTOFIX® REFERENCES IN ASIA

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Geosynthetic clay liner (GCL) Bentofix®

BENTOFIX®

Conservative correlation of internal shear stress, dependent on the Bentofix® peel strength (hydrated under low confining stress)

Conservative correlation of internal shear stress, dependent on the Bentofix® peel strength (hydrated under low confining stress)

Performance of powdered Bentofix® bentonite compared to granular bentonite in correlation to water content and gas permittivity

Performance of powdered Bentofix® bentonite compared to granular bentonite in correlation to water content and gas permittivity

Precipitation, drainage run-off and permeation values of geosynthetic clay liners under 1m cover soil in German climate

Precipitation, drainage run-off and permeation values of geosynthetic clay liners under 1m cover soil in German climate

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