Mechanical Properties of Hot Asphalt Mixture Modified with Graphene Oxide (GO)

The modification of asphalt binders with advanced nanomaterials has gained attention due to its potential to improve pavement durability and mechanical performance. This study investigates the influence of Graphene Oxide (GO) on the physical and mechanical properties of hot mix asphalt (HMA). GO was incorporated into the asphalt binder at dosages of 0.5, 0.7, 1.0, and 1.5% (by weight of asphalt binder) using the wet process, where GO was blended into the binder at 160 °C for 30 min under high shear mixing to ensure uniform dispersion. The modified mixtures were tested for penetration, softening point, kinematic viscosity, and Marshall stability and flow. Results indicated that 1.0% GO yielded the highest improvement in stability (14.31% above control), while also reducing Marshall flow by 7%, indicating enhanced stiffness and rutting resistance. Improvements are attributed to the strong interfacial bonding between GO sheets and the asphalt matrix, increasing binder stiffness and thermal stability. These findings confirm the potential of GO as a cost-effective nanofiller for producing high-performance asphalt mixtures.