Sensitivity of Oklahoma Binders on Dynamic Modulus of Asphalt Mixes and Distress Functions

AbstractFor designing pavements many state agencies, including those in Oklahoma, use the 1993 AASHTO Guide for Design of Pavement Structures, which is empirical in nature. However, the Mechanistic-Empirical Pavement Design Guide (MEPDG) is believed to predict pavement distresses in a more mechanistic approach, on the basis of material properties, local traffic, and climate conditions. Among material properties in the MEPDG, the dynamic modulus (E*) of the asphalt mix is one of the key parameters necessary to achieve the highest level of design reliability. The present study was conducted to estimate E* values of two commonly used hot mix asphalt (HMA) mixes (S3 and S4) in Oklahoma. Different design reliability levels, on the basis of rheological properties of three performance grade (PG) binders, were considered. These asphalt binders were collected from three different sources in Oklahoma. Furthermore, sensitivities of major pavement distresses, namely, rutting, fatigue cracking, thermal cracking, and r...

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