Evaluation of the influence of graphene oxide on asphalt binder physical and rheological properties

Abstract

The effects of graphene oxide (GO) on the rheological properties, performance grade (PG), and aging resistance of asphalt binders (AB) were systematically studied in this work. A series of asphalt samples modified with varying GO concentrations (0.5%, 1%, 1.5%, 2%, and 3%) were prepared and subjected to comprehensive characterization and performance tests, including penetration, softening point, elongation, viscosity, dynamic shear rheometry, and aging evaluation using the Rolling Thin Film Oven Test. The results revealed that incorporating GO into the asphalt matrix led to enhanced stiffness and elasticity, with increased the complex modulus and reduced the phase angle. Furthermore, the modified AB's high-temperature PG improved with increasing GO content, with the 2% and 3% GO-modified binders exhibiting properties comparable to those of PG70. Specifically, the investigation revealed that GO modification minimized the impacts of the aging process on the properties of AB, perhaps enhancing their long-term performance and durability. This research highlights the potential benefits of utilizing GO as an effective asphalt modifier, contributing to the development of more resilient and sustainable pavement systems. The findings provide valuable insights for researchers and engineers aiming to optimize the use of GO in asphalt modification to achieve enhanced performance and aging resistance in various climatic and service conditions.