Rheological properties of modified asphalt binder with nanosilica and SBS

Rheology is the science that deals with the deformation of materials relation with load and time rate of load application. The goal of this study is finding effects of two modifier nanosilica (nSIO(2)) and Styrene Butadiene Styrene (SBS) on the chemical bonding and rheological properties of local asphalt binder. In this study, 3% and 5% of nanosilica (nSIO(2)) and Styrene Butadiene Styrene (SBS) were added to the asphalt binder. It was found that with the addition of nanosilica to the control asphalt binder lead to slightly increased the viscosity of the control binder, as SBS polymer add the viscosity increased three times than reference viscosity of control asphalt binder. It was noticed the performance grade (PG) of binder not changed with addition of 3% nSIO(2), but PG increased one degree when 5% of SIO2 is added. PG of control binder increased two and three degrees with additional 3% and 5% SBS respectively. The results show that nSIO(2), and SBS slightly effect on the low temperature performance, therefore, low temperature grade not changed. Through FTIR results, it was found that the modified asphalt binder had a positive effect on anti-oxidation as compared with control binder, so, rutting and fatigue cracking performance of modified asphalt binders will be enhanced.