Impregnated geotextile barriers

Moisture Barrier. When impregnated with an asphaltic emulsion, geotextiles become impermeable and can then be used as moisture barriers. The primary appHcation for this type of geotextile is in pavement rehabiHtation (Fig. 8). 

Both woven and non-woven geotextiles can serve as moisture barriers when impregnated with bituminous, rubber-bitumen, or polymeric mixtures. Such impregnation reduces both the cross-plane and in-plane flow capacity of the geotextiles to a minimum. However, for liquid containment applications, what is referred to as a GCL will be more effective. 

Sealing or fluid barrier Impeding the flow of a liquid (or gas) using geomembranes or geotextiles which are field sprayed or impregnated with bitumen or polymeric mixes. 

There are at least 80 specific application areas for geotextiles that have been developed however, the fabric always performs at least one of five discrete functions separation, reinforcement, filtration, drainage, and moisture barrier (when impregnated) (Ingold, 1988 Svedova, 1990). 

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