Geotextile materials polymers and fibres

Although woven fabrics can be impregnated and coated in bitumen to give a bituminous geomembrane (BGM), the geomembranes widely used as impervious sheets are largely made from high-, medium-, and low-density polyethylene (HDPE, MDPE, LDPE), but PP, ethylene propylene diene monomer (EPDM) and PVC are used as alternatives for some applications. 

15 Comparison of tensile properties of polyester and polypropylene fibres (Source-. From Reference 57.) 

As stated earlier, this chapter is primarily about geotextiles and related materials as a subcategory of geosynthetics. The reader wishing to obtain more information on geomembrane polymers may access References 15-22. 

Non-woven geotextiles are fibrous sheets in which the fibres can be almost randomly orientated. These materials may be manufactured from either staple fibres (synthetic or natural) or continuous filaments of PP or PET which are randomly distributed in layers onto a moving belt to form a web of assembled fibres blends of PP and PET staple fibres are also used. 

With staple fibres, the web is formed by a carding machine, usually a roUer and clearer card, and is cross-laid onto the moving belt. Continuous 

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