Unlike the AASHTO 1993 pavement design guide, the new Mechanistic Empirical Pavement Design Guide (MEPDG) is heavily dependent on asphalt mixture variables such as air void content, percentage binder, binder performance Grade (PG) at level 3 analyses. Therefore, it is important that pavement designers and engineers have sufficient knowledge of how a particular input parameter affects the MEPDG output or pavement performance during the service life. In this study, a one-to-one sensitivity of pavement performances such as rutting, cracking and International Roughness Index (IRI) to three mix variables namely, air void, asphalt content and binder PG are studied. It is shown that PG grade affects asphalt concrete (AC) rutting significantly. Alligator cracking is sensitive to air voids and binder content. Longitudinal cracking and IRI is not sensitive to these three mix design variables.
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