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Geotechnical Testing Journal, Vol. 28, No. 1 Paper ID GTJ12580

Summary: Geotechnical Testing Journal, Vol. 28, No. 1
Paper ID GTJ12580
Available online at: www.astm.org
M. Emin Kutay 1
and Ahmet H. Aydilek 2
Filtration Performance of Two-Layer Geotextile
ABSTRACT: Nonwoven geotextiles are commonly used in filtration applications. For some applications, however, a nonwoven geotextile filter
may not have the required mechanical properties to withstand deformations, and an additional woven geotextile is usually employed in design.
While reinforcement is an important function expected from these two-layer geotextile systems, filtration is another function that is critical for the
long-term performance. Recent observations in geotextile filter design suggested that the filtration characteristics of these systems can be highly
different than those of single-layer systems. A laboratory test program was undertaken to evaluate the filtration performance of four different
woven/nonwoven geotextile combinations with fly ash and bottom-sea dredged sediments. For comparison, these geomaterials were also tested with
two single-woven geotextiles. The results indicated that both fly ash and dredged sediments could be successfully filtered by a variety of woven
geotextiles and nonwoven/woven combinations. Results also showed that use of a two-layer geotextile system, rather than a single-woven geotextile,
significantly increased the filtration capacity. Higher amounts of fines accumulated at the sediment-geotextile interface than the fly ash-geotextile
interfaces, indicating that geotextiles are more prone to clogging during filtering dredged sediments.
KEYWORDS: Filtration, Geotextile, Gradient Ratio Test, Fly Ash, Dredged Sediment
Filtration continues to be one of the most important issues in


Source: Aydilek, Ahmet - Department of Civil and Environmental Engineering, University of Maryland at College Park


Collections: Engineering