Waste cooking oils (WCOs) show promise
as a rejuvenator for reclaimed
asphalt pavement (RAP) binders. Their use helps to make RAP a renewable
resource and to address environmental concerns related to WCO disposal.
While studies suggest that 100% RAP for pavement is feasible, RAP
will likely be combined with a virgin binder and aggregate incrementally
in the field. In this study, the rheological properties of the virgin
binder blended with a simulated RAP binder and 10% waste vegetable
oil (WVO) as a rejuvenator were examined. Viscosities below that of
a PG 64-22 virgin binder were observed with WVO in blends of 40 or
60% RAP and the virgin binder. The virgin-60% RAP/WVO binder blend
retained a Superpave grade of the virgin binder and was found to satisfy
requirements for both rutting parameter and fatigue resistance. Results
indicated that WVO significantly reduced the effects of long-term
ageing, making the blend containing RAP durable. The effect of RAP
content on WVO/virgin binder blends was most pronounced on the rutting
parameter. A “molecular lubrication” model is suggested
as a mechanism for the viscosity reduction with WVO.
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