Published: Jan 2000
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Development of a simple method of testing nonwoven geotextiles in wide-width testing without using complex grips is presented. The technique has been used mainly on 200-mm-wide samples and has been checked using light 500-mm-wide samples (due to machine testing load limitations on the 500 mm samples). It may be used on any width of geotextile if a testing machine of sufficient capacity is available. The proposed method uses a loop of geotextile that is pulled apart by two bars inserted through the loop. The loop joint is made using heavy duty glue applied by a heat gun. By replacing the glue joint with a seam the method is applicable to testing seams. In order to gauge the accuracy of the method a number of variables were tested. These included two types of polymers, the length of the specimen, the rate of extension, and the direction of extension versus the machine or cross-manufactured direction of the geotextile. The test is quick and the testing technique simple. In the one case where manufacturer's published minimum strength results were available every comparative test obtained exceeded those published results. This shows that the modified methodology has given expected results.
elongation, geotextile, laboratory tests, material tests, mechanical properties, nonwoven, tensile strength, testing
Graduate Student, Queen's University, Kingston, ON
Professor Emeritus, Queen's University, Kingston, ON