The present study explores the use of nano Al₂O₃ as a potential asphalt binder modifier. The study investigates the effects of different concentrations (0%,0.5%,1% and 2% by weight of the asphalt binder) of nano Al₂O₃ on various properties of the asphalt binders. XRD analysis is used to study the amorphous/crystalline nature of the base asphalt binder and nano Al₂O₃ modified asphalt binder. The influence of different temperatures and strain rates on the viscosity of the asphalt binder is evaluated. It was seen that the asphalt binder showed a shift from Newtonian behaviour to non-Newtonian behaviour upon the addition of nano Al₂O₃. The rutting evaluation of the asphalt binders was carried out by utilising different approaches like Superpave rutting parameter, multiple stress creep and recovery test, zero shear viscosity, and creep test. Furthermore, intermediate-temperature performance and aging resistivity of the modified asphalt binders was also evaluated. Results showed that the addition of nano Al₂O₃ enhances the stiffness of the asphalt binder and improves its recovery abilities. The modified asphalt binder was found to perform well under varying stresses and sustained loading and hence showed improved permanent deformation characteristics. Fatigue performance was evaluated utilising Superpave fatigue parameter and time sweep tests, and the nano Al₂O₃ modified asphalt binders showed improved fatigue life. The addition of nano Al₂O₃ also leads to an improvement in the aging resistance of the asphalt binder. The study shows an overall improvement in high temperature, intermediate temperature, and aging resistance of the asphalt binders using nano Al₂O₃ as an asphalt binder modifier.

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