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Interrelationship between Pcire Openings of Geotextiles and Methods of Evaluation

Designing a geotextile as a filter requires -· information on the largest pore openings, 095, the porosity and the pore-size distribution of the geotextile. In this paper, the 095 and pore-size distribution for twenty-two nonwoven geotextiles using six different techniques (dry, wet, and hydrcxiynamic sieving, bubble point, mercury intrusion and image analysis) are presented. Considerable differences in 095 values have been found as detennined from different methcxis, incijcating that these results are a function of the technique rather than a unique property of the geotextile.