Rheological Characteristics of Nano-Sized Hydrated Lime-Modified Foamed Warm Mix Asphalt

This study was initiated with an objective to address the rheological characteristics of the foamed Warm Mix Asphalt (WMA) modified with the newly fabricated size, Nano-sized Hydrated Lime (NHL), in comparison to Regular-sized Hydrated Lime (RHL). The NHL material was used with two particle sizes of 50and 100 nanometers (nm). The foamed WMA was produced by adding Advera. The rotational viscosity test was performed to study the effect of hydrated lime particle size on the binder's viscosity. The Dynamic Shear Rheometer (DSR) test was employed to evaluate rutting and fatigue cracking of the binders. Additionally, the Bending Beam Rheometer (BBR) test was used to evaluate the low temperature characteristics of the long-term, aged asphalt binders. The hydrated lime particle size did not show significant effect on the binder viscosity. The NHL can be used as an effective way to reduce the rutting as compared to the RHL. Although NHL-modified binders can suffer from the increased stiffness, the binders met fatigue and low temperature cracking specifications.