Sensitivity Analysis of Flexible-Pavement Response and the AASHTO Design Guide to Properties of Unbound Layers. Summary
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"Unbound granular materials generally compose the base and subbase layers in road pavements. The granular materials distribute the load through aggregate contacts to a level sustainable by the subgrade. Pavement design and analysis often describe the base and subbase layers using the resilient modulus, which is the ratio of the dynamic-resilient stress to the dynamic-resilient strain. The resilient modulus represents a power function of the sum of the principal stresses. However, this model has serious limitations because it neglects shear strain's effect and it only works at low strain values in granular-materials characterization... The influence of using different response models (isotropic vs. anisotropic and linear vs. nonlinear) on the performance predictions of asphalt pavements needs further investigation. In addition, the sensitivity of the proposed AASHTO 2002 guide to unbound layers' properties needs urgent evaluation prior to the use of this guide in practice."