Application Process of Hydrated Lime to Resist Moisture Damage and Rutting in Asphalt Mixture

Abstract

Moisture damage can manifest in 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 common anti-stripping additives, hydrated lime (HL), is considered to improve properties of asphalt mixture in resistance of moisture damage. Lime application process can be introduced to asphalt mixture by either adding dry HL to wet aggregates or adding lime slurry to dry aggregates. This study aims to evaluate laboratory performance-based properties of asphalt mixtures using two lime application processes as well as to compare between HL-modified asphalt mixture and polymer-modified asphalt mixture. Results indicated that performance of HL-modified asphalt mixture in moisture damage and rutting is related to lime application processes.