Geosynthetic clay liners (GCLs) serve as effective hydraulic barriers, composed of a
layer of low-permeability materials like bentonite, supported by geotextiles and/or
geomembranes. These products are typically interconnected through various methods
such as needle-punching, stitching, or chemical adhesives. GCL liners offer distinct
benefits for containment purposes, distinguishing them from Compacted Clay Liners
(CCL). In terms of hydraulic conductivity, GCL liners demonstrate superior performance.
They require less skilled labor and are cost-effective to install compared to CCL.
Additionally, GCL liners have a shallower soil base excavation requirement than CCL,
reducing the disruption of native soil. Furthermore, they exhibit excellent resistance
during freeze/thaw cycles, making them easily repairable. Within the geoenvironmental
industry, Geosynthetic clay liners (GCLs) have established themselves as reliable
sealing solutions.
As the leading GCL installer, IEC has installed GCL liners for numerous environmental
containment applications such as landfills, mining, stormwater, and wastewater
retention basins. They provide long-lasting resistance to degradation from both physical
and environmental factors and are an excellent alternative to conventional compacted
clay liners.
Typical GCL Liner applications include:
- Secondary containment
- Landfill liners and caps
- Mine tailings storage
- Wastewater ponds and lagoons
- Canals, stormwater impoundments and wetlands
Multiple formulations of GCLs exist, differentiated by the type of geotextiles used
(woven, non-woven, or combinations), the use of geomembranes, and reinforcement
techniques such as needle-punching. This diversity in design allows GCLs to be tailored
for specific project requirements, including enhanced shear strength, creep resistance,
and long-term hydraulic performance. The bentonite core swells upon hydration,
creating an effective impermeable barrier often used as alternatives or supplements to
compacted clay liners.
Overall, GCLs represent a versatile, reliable, and efficient solution in geoenvironmental
engineering for controlling fluid movement and protecting groundwater and ecosystems
from contamination risks associated with containment systems.
For more information on geosynthetic clay liners (GCLs) or to determine if a GCL is
right for your application, please contact IEC.
