rheological properties of asphalt binder containing hydrated lime

sustainable development addresses concerns about limited natural resources and impacts of human beings on environment. in this regard, construction of durable pavements that can withstand both traffic and climate effects is essentially required. moisture damage is the most premature distress that affects asphalt pavement life and performance. hydrated lime (hl) is the most commonly used anti-stripping agent that decreases deteriorating effects of water on asphalt mixtures. the main objective of this study is to characterize the properties of hl-modified mastic through superpave asphalt tests and compare them by the base binder. a pg64-22 asphalt binder from tehran refinery (pasargad) was used as the base binder. the concentrations of hl tested were 20,30  and40 percent of the base binder weight. the viscosity properties for the binders in the original state, rutting resistance, fatigue cracking properties, and the low temperature crack resistance were evaluated. superpave binder tests showed that hydrated lime strongly improves high-temperature rheology, but it deteriorates the low temperature performance slightly.