Investigation of the Stress Ratio Model Using Moist Aggregate Bases

摘要

Laboratory tests were performed to study the behavior of unbound granular basematerials when subjected to dynamic loadings. The resilient modulus tests were conducted on granular materials containing varying amounts of moisture below and above the optimum moisture content level. The test loadings were both below and above the static shear strength of the material. The objective of the testing was to validate an improved structural characterization model known as stress ratio model which was developed by testing dry aggregates. The test results showed that the resilient modulus of granular bases increases with increasing stress states until the static shear strength of the material, the resilient modulus decreases rapidly. The predicted resilient modulus values from Stress Ratio model without using static shear test parameters are very consistent with the predicted resilient modulus results obtained by analyzing Stress Ratio model using static shear test parameters. The analyses results indicate that the Stress Ratio model provides a realistic characterization of the behavior of unbound granular bases for both dry and moist aggregates.