ADVANTAGE 1: BETTER DESICCATION PROTECTION
Bentofix® X GCLs are coated with a polyethylene layer on the slit-film woven side. Installed with the coating facing up, impermeability and performance against desiccation improve. In a test Bentofix® X was placed over a sand layer with the PE coating faced up. Bentofix® X was saturated for 3 weeks with water through the sand layer under a confining stress of 18kN/m² prior to the desiccation period at a temperature of 40°C and air humidity of 40%. During a period of 250 days the moisture content of the bentonite layer was monitored. The results show that a relative water loss of less than 10% occurred. Therefore it can be stated that Bentofix® X-types do not desiccate under these conditions.
Desiccation behaviour of geosynthetic clay liners in a laboratory test
ADVANTAGE 2: SHEAR STRENGTH
The interface friction angle also plays a major role in slope applications. The mechanically bonded nonwoven of Bentofix® provides high interface friction angles. The structure of the polyethylene coating of Bentofix® X geosynthetic clay liners varies according to the thickness of the coating. Therefore, project- specific friction angles should be specified. For slope inclinations up to 2.5:1 (h:v) the extruded friction structure of Bentofix® X-types is typically suitable.
Example of shear stress of Bentofix® X coating against various materials at 20kPa confining stress
ADVANTAGE 3: CHEMICAL RESISTANCE
The polyethylene coating of Bentofix® X-types is manufactured from high-quality resins, which are comparable to those used in certified geomembranes. This gives the coating the necessary chemical resistance for long-term bentonite protection against critical substances.