The performance of Epoxidised Natural Rubber modified asphalt using nano-alumina as additive

Polymers are commonly used for improving the physical and rheological properties of asphalt. Several methods have been suggested to increase the compatibility between polymers and asphalt. Adding of nanoparticles to asphalt can improve the performance of polymer modified asphalt. This study is about evaluating the performance of Epoxidised Natural Rubber (ENR) modified asphalt using nanoalumina (Al2O3) as Additive. In this study, an ultrasonic device was used to disperse Al2O3 at 2, 4, and 6 wt% into base asphalt (BA) and ENR using a high shear mixer. The effects of Al2O3 addition on the base asphalt and Epoxidised Natural Rubber modified asphalt (ENRMA) were then investigated, including the physical properties, storage stability, rheological properties and microstructure of the binders. High compatibility between Al2O3 and ENR led to a better dispersion of ENR in the asphalt, improving the rheological properties of the binder. Based on dynamic shear rheometry tests, Al2O3 reduces the temperature susceptibility of the asphalt and facilitated polymeric modification by improving the compatibility, increasing the viscosity, stiffness, adhesion and elastic behaviour of the binders. Al2O3 also improved the rutting resistance behaviour at high temperatures. The best results were recorded for polymer-modified asphalt containing 6% Al2O3 compared to the base asphalt without any Al2O3.