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To evaluate the effects of back pressure on the measurements of geotextile in-plane transmissivity, a new test device has been developed. A series of transmissivity tests were performed under back pressures ranging from 6.9 to 414 kPa. Results show that the influence of back pressure is significantly less than that caused by the variability among different specimens. However, to obtain repeatable results and to conduct the tests efficiently, it is strongly recommended using deaired water and to flush the specimen before testing.
Assistant professor, Clarkson University, Potsdam, NY
Professor, University of Washington, Seattle, WA
Civil engineer, LaBella Associates, Rochester, NY
Stock #: GTJ10207J