Application of Hydrated Lime in Asphalt Mixture for Moisture Damage and Rutting Resistance

Moisture damage can manifest in the hot mix asphalt pavements in forms of stripping and softening of asphalt. It results in loss of stability and bearing capacity failure, and rutting of asphalt pavement. One of the common anti-stripping additives, hydrated lime, is considered to improve the properties of asphalt mixture in resistance of the moisture damage. The lime application process can be introduced to the asphalt mixture by either adding dry hydrated lime to wet aggregates or adding lime slurry to dry aggregates. This study aims to evaluate the laboratory performance-based properties of asphalt mixtures using two different lime application processes as well as to compare between hydrated lime m odified asphalt mixture and polymer modified asphalt mixture. Results indicated that the performance of hydrated lime modified asphalt mixture in moisture damage and rutting resistance is related to the lime application processes. Adding the hydrated lime directly to the asphalt binder is a promising and economical method to improve the performance of asphalt mixture in moisture damage and rutting resistance.

Keywords:

Moisture Damage , Hydrated Lime , Polymer-Modified and Rutting Resistance