SYMPOSIA PAPER Published: 01 January 1996

A Modified Gradient Ratio Test Device


The gradient ratio test is used to assess soil-geotextile compatibility in filtration applications. Experience gained in performing the test is summarized for ten soils and four non-woven geotextiles, and the potential for application of the test method is demonstrated. Details of a new, modified test device are then presented which address a perceived limitation of the existing configuration of the test device. Results of a preliminary series of tests, performed to commission the modified gradient ratio test device, suggest the filtration behaviour of the geotextile is essentially independent of normal stress.

Author Information

Fannin, RJ
University of British Columbia, Vancouver, B.C., Canada
Vaid, YP
University of British Columbia, Vancouver, B.C., Canada
Palmeira, EM
University of Brasilia, Brasilia, Brazil
Shi, YC
APG Geo Design Services, Singapore
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Developed by Committee: D35
Pages: 100–112
DOI: 10.1520/STP15596S
ISBN-EB: 978-0-8031-5335-6
ISBN-13: 978-0-8031-2047-1