GCL-4 consists of a layer of bentonite encapsulated between two
geotextiles (a nonwoven and a woven polypropylene geotextiles),
needle punched together and laminated on one side to a polyethylene
membrane for maximum performances under a wide variety of field
conditions. This integrated matrix of bentonite and needle punched
fibers provides high shear strength and allows the GCL-4 to keep
low permeability even in presence of adverse installation
conditions. The GCL-4 has high internal shear strength
characteristics for steep slope applications.
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