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Large-scale flow rate testing was performed on a multi-component GCL, a needlepunch-reinforced woven/nonwoven product with a polyethylene geofilm laminated to the nonwoven side. Testing was performed in a 0.56 -m (1.8-ft) inside diameter pressure vessel commonly used for large-scale hydrostatic puncture testing of geosynthetics by ASTM D5514 [Annual Book of ASTM Standards, ASTM International, West Conshohocken, PA]. Two separate large-scale flow tests were performed in this study: (1) intact (unseamed) samples of the multi-component GCL placed over a subgrade stone protrusion, and (2) seamed samples of the multi-component GCL. Samples were placed over a compacted soil subgrade under a confining stress of 6.3 kPa (132 psf), soaked with tap water for 24 h, and then subjected to hydrostatic pressures ranging from 69 to 620 kPa (10 to 90 psi). Flow rates through the samples were monitored through a burette for at least 24 h. Measurements of inflow versus time for the two tests were used to assess vertical flow through the intact GCL specimen and preferential flow through the GCL seams. Because seam coverage in the field differs from the seam coverage in the laboratory testing device, seam coverage factors were derived to predict leakage through GCL field-scale seams. The testing program concluded that the flow rate through seamed GCL sections were only slightly higher than the unseamed sections.
multi-component gcl, seam flow
Technical Services Manager, CETCO, Hoffman Estates, IL
Laboratory Manager, SGI Testing Services, LLC, Norcross, GA
Trauger, R. J.
Vice President, CETCO, Hoffman Estates, IL
Technical Support Engineer, CETCO, Hoffman Estates, IL