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Geomembrane is very low permeability synthetic membrane liner or barrier used with any geotechnical engineering related material so as to provide waterfroof function in a human-made project, structure, or system. Geomembranes are made from relatively thin continuous polymeric sheets, but they can also be made from the impregnation of Geotextiles with asphalt, elastomer or polymer sprays, or as multilayered bitumen geocomposites. Continuous polymer sheet geomembranes are, by far, the most common form.
The classification is normally defined according to raw materials, there are high-density polyethylene (HDPE), low-density polyethylene(LDPE),linear low-density polyethylene (LLDPE), polyvinyl chloride (PVC), chlorosulfonated polyethylene (CSPE), ethylene propylene diene terpolymer (EPDM) , EVA etc.
The mainphysical properties of geomembranes in the as-manufactured state are:
※Thickness (smooth sheet, textured, asperity height)
※Melt flow index
※Mass per unit area (weight)
※Vapor transmission (water and solvent).
There are manymechanical tests that have been developed to determine the strength ofpolymeric sheet materials. Many have been adopted for use in evaluatinggeomembranes. They represent both quality control and design, i.e., indexversus performance tests.
※tensile strength and elongation (index, wide width, axisymmetric,and seams)
※interface shear strength
※stress cracking (constant load and single point).