Investigation of the effects of recycled engine oil bottoms on asphalt field performance following an oxidation modeling approach

ABSTRACT

This work investigates the effects of recycled engine oil bottoms (REOBs) on asphalt field performance by comparing asphalts with and without REOBs in terms of the asphalt properties required for pavement oxidation modeling. Specifically, oxidation reaction kinetics parameters, dynamic shear rheometer (DSR) function (DSRFn) hardening susceptibility (HS), and low sheer viscosity (LSV) HS are determined and compared for base binder, 5 wt.% REOBs, and 15 wt.% REOBs blends. At the higher percentage, addition of REOBs appears to increase the initial oxidation rate at field temperatures and significantly increases LSV HS, but does not significantly increase the DSRFn HS. A field modeling example elucidates the effects.

KEYWORDS:

• Asphalt recycling agents
• carbonyl area
• DSR function
• hardening susceptibility
• low sheer viscosity
• oxidation modeling
• oxidation reaction kinetics
• recycled engine oil bottoms

Acknowledgments

Support for this work by the Texas Department of Transportation (TxDOT, project 0-6881), in cooperation with the Federal Highway Administration (FHWA), is greatly appreciated.

Disclosure statement

The contents of this article reflect the views of the authors, who are responsible for the facts and accuracy of the data presented herein, and do not necessarily reflect the official views or policies of the TxDOT. This article does not constitute a standard, specification, or regulation and is not intended for construction, bidding, or permit purposes.