Impact of Antistrip Additives on the Long-Term Aging Rheological Properties of Asphalt Binders

Abstract

Hydrated lime and liquid antistrip agents have long been used as an asphalt additive to improve resistance to moisture damage. Previous studies have shown that the addition of hydrated lime to asphalt binders reduced the aging propensity of asphalt by adsorbing naturally occurring oxidation catalysts or promoters from the asphalt binders. This study was conducted to evaluate the impact of lime and liquid antistrip on the long-term aging of five asphalt binders. The first part of the study evaluated the intermediate- and low-temperature rheological properties of these asphalt binders with no additive, blended with hydrated lime, and blended with liquid antistrip. The rheological properties of the binders were evaluated at the original and long-term aged stages. The second part of this effort evaluated the aging characteristics (e.g.,