Comparison between mechanistic analysis and in-situ response of full-depth flexible pavements

Three full-depth flexible pavement sections having 152, 254, and 420mm of HMA placed on 300mm of lime-stabilized subgrade were constructed and exposed to APT using the Advanced Transportation Loading ASsembly (ATLAS), housed at the University of Illinois at Urbana-Champaign. Transverse tensile strain histories at the bottom of HMA under various loading conditions (load, tire pressure, and speed) were measured through embedded strain gauges at the HMAstabilized subgrade interface. Indirect tensile complex modulus tests for three HMA materials were conducted using an Instron Universal Test Machine (UTM). The elastic modulus of subgrade was backcalculated from FWD testing conducted on the test sections. The pavement responses of test sections were calculated using the NCHRP 1-37A Mechanistic-Empirical Pavement Design Guide (MEPDG) procedure as well as a finite element model.

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