This research study focuses on the actual performance of the flexible pavements and its relationship with the in-situ mechanistic\r\nand volumetric properties. The data required for the study were obtained using the Long Term Pavement Performance database.\r\nApproximately, 116 flexible pavement sections throughout United States were analyzed and discussed.The results indicated that the\r\ntemperature has a significant affect on the backcalculatedmodulus of the hot mix asphalt layer.However, no strong relationship was\r\nobserved between the hot mix asphalt backcalculated modulus and in situ air voids. It was found that fatigue life was a function of\r\ntensile strain at the bottomof hot mix asphalt layer, peak surface deflection, hot mix asphalt air voids and maximum specific gravity,\r\nand ambient air temperature. Similar relationships between the rut life, mechanistic and volumetric properties were established for\r\nwet-freeze and wet-no-freeze climatic zones.The sensitivity analysis revealed that the rut performance in wet-no-freeze sections is\r\nmainly affected by higher base and roadbed compressive stresses and strains. On the other hand, the performances in wet-freeze\r\nsections are highly depended on roadbed compressive strain and modulus ratio of subbase to roadbed.
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