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Behavior of the Expanded Polystyrene Elastic Inclusion at Integral Abutments
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2025-06-01
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[PDF-3.01 MB]
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Edition:Final Report
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Abstract:This report presents the findings of a laboratory study conducted by the Sustainable Geotransportation/Geoenvironmental Infrastructure (SGI) Research Group at George Mason University. The research focused on investigating the ability of standard (S) and elasticized (E) expanded polystyrene (EPS) to provide elastic inclusion in integral abutments. EPS materials in this study were selected based on input from the Technical Review Panel of this research. The laboratory tests were divided into the following three tasks. Task 1 focused on quantifying the behavior of EPS when the material is loaded under uniform uniaxial compression (not cyclic loading) at a 10% per minute strain rate per the current ASTM D1621 (2016) standard. The findings showed that the behavior of E-EPS differs when loaded in the elasticized versus non-elasticized directions. The direction of loading did not affect the behavior of S-EPS. Specimen shape did not significantly influence stress-strain behavior, but specimen size affected the stress- strain behavior of both EPS types. In all testing conditions, both EPS types exhibited elastic behavior only when the applied load induced no more than 2 to 3% strain on EPS.
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