ASSESSING THE EFFECT OF EMULSIFIED ASPHALT AS A REJUVENATOR FOR HIGHLY OXIDIZED ASPHALT PAVEMENT

Abstract

Rejuvenation of highly oxidized asphalt pavement is a good choice in reducing the binder viscosity and hardness to reach the desired mixture workability and the necessary performance, especially when using high percentage of reclaimed asphalt pavement (RAP) in the mixture. Rejuvenating agents such as emulsified asphalt cements or emulsified recycling agents are utilized for fully cold recycling operations due to the liquid nature for them at ambient temperatures, also these agents have the ability for being scattered throughout the mixture, and do not consider a reason in main air pollution problems. The purpose of this research is studying the effect of emulsified asphalt type cationic slow setting low viscosity (CSS-1) as a rejuvenator material for an aged asphalt pavement, design cold recycled mixture (CRM) under Superpave system for binder course layer and evaluating the final mix design for stability and flow, index of retained strength and punching strength in comparison with hot recycled mixture (HRM). The results indicated that CSS-1 played an important role to help utilizing high RAP percentage in CRM as compared to HRM due to its effectiveness as softening agent to the hardening binder.