Effects of temperature on the rupture strength and elastic stiffness of geogrids
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Publication Details
Author list: Kongkitkul W., Tabsombut W., Jaturapitakkul C., Tatsuoka F.
Publisher: ICE Publishing
Publication year: 2012
Journal: Geosynthetics International (1072-6349)
Volume number: 19
Issue number: 2
Start page: 106
End page: 123
Number of pages: 18
ISSN: 1072-6349
eISSN: 1751-7613
Languages: English-Great Britain (EN-GB)
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Abstract
An automated tensile loading system that can accurately control histories of both loading and temperature was developed. A series of unconventional tensile loading tests were performed on polypropylene (PP), high-density polyethylene (HDPE) and polyester (PET) geogrids using this system. The following was found. The temperature significantly affects the elasto- viscoplastic stress-strain properties of the tested polymer geogrids. The inviscid stress-viscoplastic strain relation changes with temperature. The tensile rupture strength decreases by 9.2%, 26.7% and 4.5% when the temperature rises from 308C to 508C with PP, HDPE and PET geogrids, respectively. The elastic stiffness of the geogrid was evaluated by applying small-strain-amplitude unload-reload cycles after a certain period of sustained loading during otherwise monotonic loading at a constant load rate. The value increases with an increase in the tensile load level at a fixed temperature, and decreases with an increase in the temperature at a fixed load level. A set of mathematical expressions are proposed to describe these trends of tensile rupture strength and elastic behaviour. ฉ 2012 Thomas Telford Ltd.
Keywords
Elastic stiffness, Geogrid, Geosynthetics, Rupture strength, Tensile loading test, Three-component model
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