Development of empirical model for the prediction of viscoelastic properties of Nano Hydrated Lime (NHL) modified asphalt binders

This study developed empirical models to forecast the viscoelastic characteristics of asphalt binders enhanced with Nano Hydrated Lime (NHL). The study used AC-60/70 penetration grade bitumen and included NHL at concentrations of 0%, 1%, 3%, 5%, and 10% by weight of the binder. The models focused on the Superpave rutting factor (G/Sin δ) and viscosity, while integrating NHL content and test temperature as primary factors. The viscosity model demonstrated an exponential correlation with NHL content, but the G/Sin δ model showed a nonlinear pattern attributed to decreased stiffness at higher NHL percentages. The ideal NHL content was determined to be 5%, which significantly improved rutting resistance and viscosity. These models serve as a pragmatic instrument for engineers to enhance NHL use in asphalt binders, hence augmenting pavement performance and sustainability.