Measurement of Geotextile-Water Characteristic Curves Using a Controlled Outflow Capillary Pressure Cell. Issue 3 (1st January 2001)

• Record Type: Journal Article
• Authors: Knight, M.A.; Kotha, S.M.
• Is Part Of: Geosynthetics international. Volume 8:Issue 3(2001)
• Page Start: 271
• Page End: 282
• Publication Date: 2001-01-01
• Subjects: Nonwoven; -- Geotextile; -- Geotextile-water characteristic curve; -- Unsaturated flow; Geosynthetics -- Periodicals; Geosynthetics; Periodicals; 624.1892
• DOI: 10.1680/gein.8.0195
• Languages: English
• ISSNs: 1072-6349

Abstract

Abstract : The present paper describes the use of a controlled outflow capillary pressure cell for the measurement of geotextile-water characteristic curves. Fine sand with a known soil-water characteristic curve and a geotextile column drainage experiment were used to validate the controlled outflow cell. The controlled outflow cell was also used to measure drainage geotextile-water characteristic curves for one, three, and six vertically stacked nonwoven geotextile specimen layers. Test results indicate the following: (i) the controlled outflow cell can measure a complete nonwoven drainage geotextile-water characteristic curve with a water entry pressure of 50 mm; (ii) vertical stacking of the nonwoven geotextile has little influence on the geotextile-water characteristic curve; and (iii) a geotextile-water characteristic curve can be measured in less time when compared with Klute's method. Test results also indicate that ASTM D 854 may be used to determine the specific gravity of the nonwoven geotextile.