Effects of asphalt cement rejuvenating agents

Rejuvenating agents are examined with regard to the effect of the rejuvenator at various levels of addition, upon age hardened asphalts, the aging characteristics of the rejuvenated asphalts, and the uniformity of mixing of the rejuvenating agents with asphaltic concrete mixes. Prediction equations yielding the proper quantity of rejuvenator to be added to an oxidized asphalt were examined. The rejuvenated asphalts followed anticipated patterns when tested for penetration, viscosity, and ductility. The rejuvenated asphalts demonstrated acceptable viscosity indices when subjected to the Thin Film Oven Test. Testing for uniformity of mixing in asphaltic concrete mixes proved inconclusive.