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Influence of pressure on water permeability and characteristic opening size of nonwoven geotextiles

The samples investigated in this paper are nonwoven geotextiles manufactured by mechanical carding process, bonded by needling process. Part of the samples was additional bonded by thermal calendaring process. Sampling was conducted according to the standard for geotextile with certain modifications. The samples were tested for water permeability perpendicular to the plane of samples using loads of 2, 20 and 200 kPa. Characteristic opening size of geotextiles was tested using sieving method. Research shows that different applied pressures significantly change structure and properties i.e. thickness and water permeability normal to the plain under load of geotextile.

polypropylene; polyester; calendaring; water permeability with load; AOS

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