Conference proceeding
Comparing the Creep Behavior of High Density Polyethylene Geogrid Using Two Accereration Methods
Slopes and Retaining Structures Under Seismic and Static Conditions
09 Oct 2005
Abstract
The creep behavior of a high density polyethylene (HDPE) geogrids used for soil reinforcement applications is evaluated using two accelerated creep tests; time-temperature superposition (TTS) and stepped isothermal method (SIM). TTS is a well-accepted acceleration method to evaluate viscoelastic behavior of polymeric materials, while SIM was developed in the last ten years mainly to shorten testing time and utilize a single test specimen to minimize material variability. The applicability of the SIM test is well demonstrated, particularly for polyethylene- terephthelate (PET) geogrids. However, for HDPE geogrids, the application of the SIM has not been well established. In this paper, the creep behaviors of HDPE geogrids are evaluated using both TTS and SIM creep procedures. For the SIM procedure, four test parameters were investigated. The study confirmed that ASTM recommended values for temperature steps of 7°C and a dwell time of 10,000 seconds are suitable for HDPE geogrids. At applied loads of 10 and 20%, only the primary creep state was measured, while secondary creep state appeared at applied loads of 30 and 40%. In addition, test specimens with and without transverse junctions exhibited significant difference in creep behavior. The test specimen with junction (i.e., two longitudinally aligned ribs) displayed greater creep compliance than one without a transverse junction. Based on the same duration time of 10,000 seconds, the resulting creep behavior from SIM and TTS is very similar at 20 and 30% UTS. However, the activation energies are much higher than those long-term creep tests.
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Details
- Title
- Comparing the Creep Behavior of High Density Polyethylene Geogrid Using Two Accereration Methods
- Creators
- Y.G Hsuan - Drexel UniversityS S Yeo - Drexel University
- Publication Details
- Slopes and Retaining Structures Under Seismic and Static Conditions
- Conference
- Geo-Frontiers Congress 2005 (Austin, Texas, United States, 24 Jan 2005–26 Jan 2005)
- Resource Type
- Conference proceeding
- Language
- English
- Academic Unit
- Civil, Architectural, and Environmental Engineering
- Other Identifier
- 991019173638004721