Sensitivity analysis of flexible pavement response and AASHTO 2002 design guide for properties of unbound layers

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Title: Sensitivity analysis of flexible pavement response and AASHTO 2002 design guide for properties of unbound layers
Author: Masad, Sanaa Ahmad
Abstract: Unbound granular materials are generally used in road pavements as base and subbase layers . The granular materials provide load distribution through aggregate contacts to a level that can help the subgrade to withstand the applied loads . Several research studies have shown that unbound pavement layers exhibit anisotropic properties . Anisotropy is caused by the preferred orientation of aggregates and compaction forces . The result is unbound pavement layers that have higher stiffness in the vertical direction than in the horizontal direction . This behavior is not accounted for in the design and analysis procedures included in the proposed AASHTO 2002 design guide . One of the objectives of this study is to conduct a comparative analysis of flexible pavement response using different models for unbound pavement layers : linear isotropic , nonlinear isotropic , linear anisotropic and nonlinear anisotropic . Pavement response is computed using a finite element program . The computations from nonlinear isotropic and anisotropic models of unbound layers are compared to the AASHO field experimental measurements . The second objective is to analyze the influence of using isotropic and anisotropic properties for the pavement layers on the performance of flexible pavements calculated using the AASHTO 2002 models . Finally , a comprehensive sensitivity analysis of the proposed AASHTO 2002 performance models to the properties of the unbound pavement layers is conducted . The sensitivity analysis includes different types of base materials , base layer thicknesses , hot mix asphalt type and thickness , environmental conditions , and subgrade materials .
URI: http : / /hdl .handle .net /1969 .1 /528
Date: 2004-09-30

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Sensitivity analysis of flexible pavement response and AASHTO 2002 design guide for properties of unbound layers. Available electronically from http : / /hdl .handle .net /1969 .1 /528 .

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