Effect of pore size distribution on sediment retention and passing

Z. B. Kiffle, Shobha K Bhatia, M. M. Khachan, E. K. Jackson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Geotextile tubes are widely used for the dewatering of high water content slurries. Several sediments types that vary in size (sand, silt, and clay), composition (fly ash and sludge), and water content (80%-1600%) are generally pumped in to the geotextile tubes. For sediments retention of such high water contents, the selected geotextiles must be compatible with the pumped slurry. The geotextile tube pore openings must be tight enough for the sediments to be retained inside the tube, and at the same time they should allow the drainage of water through the geotextile tube. Therefore, successful dewatering performance requires evaluation of the pore openings of geotextile and hydraulic properties on the retention of sediments. In this study, the complete Pore Size Distribution (PSD) of four woven nonwoven and composite geotextiles with similar bubble point O95 was determined using capillary flow test (ASTM-D6767). Additionally, Pressure Filtration Tests (PFT) were conducted over a wide a range of water contents (150% -1900%). The sediment retention performances of the geotextiles were evaluated with d85 of 90μm and 65μm respectively. The results of this study indicated that complete bubble point PSD of woven, nonwoven and composite geotextiles can be measured using a capillary flow test. It was also found that geotextiles having the same O95 but different PSD showed different level of sediment retention over a range of water contents of the slurry and this is a clear indication of the contribution of other pore sizes of the geotextiles on retention performance.

Original languageEnglish (US)
Title of host publication10th International Conference on Geosynthetics, ICG 2014
EditorsMartin Ziegler, Kirsten Laackmann, Gerhard Brau, Georg Heerten
PublisherDeutsche Gesellschaft fur Geotechnik e.V.
ISBN (Electronic)9783981395396
StatePublished - Jan 1 2014
Event10th International Conference on Geosynthetics, ICG 2014 - Berlin, Germany
Duration: Sep 21 2014Sep 25 2014

Publication series

Name10th International Conference on Geosynthetics, ICG 2014

Other

Other10th International Conference on Geosynthetics, ICG 2014
CountryGermany
CityBerlin
Period9/21/149/25/14

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Keywords

  • Piping
  • Pore size distribution (PSD)
  • Retention
  • Slurry
  • Water content

ASJC Scopus subject areas

  • Atmospheric Science
  • Environmental Engineering
  • Geotechnical Engineering and Engineering Geology
  • Global and Planetary Change
  • Polymers and Plastics

Cite this

Kiffle, Z. B., Bhatia, S. K., Khachan, M. M., & Jackson, E. K. (2014). Effect of pore size distribution on sediment retention and passing. In M. Ziegler, K. Laackmann, G. Brau, & G. Heerten (Eds.), 10th International Conference on Geosynthetics, ICG 2014 (10th International Conference on Geosynthetics, ICG 2014). Deutsche Gesellschaft fur Geotechnik e.V..