Effect of Knit Structure on Tensile Properties of Warp Knitted Geogrids

Ahmadi, M. S.; A. Jeddi, A. A.

Effect of Knit Structure on Tensile Properties of Warp Knitted Geogrids

Document Type : Research/ Original/ Regular Article

Authors

M. S. Ahmadi ¹
A. A. A. Jeddi ²

¹ Textile Engineering Department, Facelty of Engineering,Yazd University, P.O. Box: 89195-741, Yazd, Iran

² Textile Engineering Department, Amirkabir University of Technology, P.O. Box: 15875-4413, Tehran, Iran

Abstract

Geogrids are important part of geosynthetic materials and have various applications in civil engineering constructions. Some geogrids are produced by textile processing methods. These geogrids contain a reinforcement fabric coated with a polymeric substance. In this paper, two common knit structures were produced as raw fabrics for warp knitted geogrids. In these structures, high count reinforcement polyester yarns were bonded to the fabric by using polyester binder yarns with special lapping patterns. After coating with an acrylic resin and performing tensile tests on the produced geogrids, it was observed that the structure in which the reinforcing yarns were surrounded by binder yarns showed higher tensile-strength-at-break, higher elongation-at-break and lower coefficient of variation than the structure with floating yarns, due to higher structural regularity and uniform distribution of tensile loads on the coated yarns of the former structure. The new structure was found to be ideal for producing geogrids with flexible yarns.

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