Rheology of Virgin Asphalt Binder Combined with High Percentages of RAP Binder Rejuvenated with Waste Vegetable Oil

Abstract

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.

Investigating Asphalt Rejuvenators from Biowastes Based on Their Wetting, Diffusion, and Compatibility

“…The Han curve, designed to forecast the compatibility of mixtures with distinct chemical structures and phases, uses viscoelastic parameters from oscillatory shearing flow states. , A Han curve positioned toward the lower right of the reference line suggests a predominant viscous component . The following abbreviation is used here: “RA” followed by the name of a rejuvenator indicates the rejuvenated asphalt binder produced by mixing P20 with the named rejuvenator.…”

“…42,43 A Han curve positioned toward the lower right of the reference line suggests a predominant viscous component. 44 The following abbreviation is used here: "RA" followed by the name of a rejuvenator indicates the rejuvenated asphalt binder produced by mixing P20 with the named rejuvenator. As shown in Figure 12, the Han curves for RA-SO-I and RA-PO, situated at the lower right, demonstrate that the double logarithmic curves of G″ against G′ at diverse temperatures yield a continuous trajectory.…”

The Influence of a New Food Waste Bio-Oil (FWBO) Rejuvenating Agent on Cracking Susceptibility of Aged Binder and RAP

“…Finally, the third category is post-consume oil wastes that include but are not limited to cooking oil/residues, waste auto engine oil/residues, cottonseed, and soybean oil residues [17,18]. Many studies have indicated that most of these materials could restore the balance lost after aging between asphaltene maltenes and aromatics by using different contents [18][19][20][21][22][23][24].…”