Responsible Use of Re-Refined Engine Oil Bottoms (REOB)

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Authors

Baumgardner, Gaylon
Hand, Adam J. T.
Hajj, Elie Y.
Aschenbrener, Timothy B.

Issue Date

2023-08

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Citation

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en_US

Keywords

Waste engine oil , re-refined engine oil bottoms , REOB , vacuum tower asphalt extender , VTAE , fluxing agent , asphalt binder

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Abstract

Re-refined engine oil bottoms (REOB), also referred to as vacuum tower asphalt extender (VTAE), has been used to modify asphalt binders to improve low temperature rheological properties since the 1980s. Since the introduction of the Superpave performance grade (PG) asphalt binders, use of REOB as a blending component or modifier to produce paving asphalt binders has increased.(1) Softer asphalt binder grades in colder climates are in greater demand to reduce low temperature cracking. Additionally, the trend to use higher levels of reclaimed asphalt pavement (RAP) and reclaimed asphalt shingles (RAS) has increased the demand for softer asphalt binder grades. These factors have increased the interest and use of fluxing agents, which include non-asphaltic asphalt binder blending stocks such as REOB. This report provides information to supplement existing publications communicating responsible use of re-refined engine oil bottoms (REOB) in asphalt binder formulations. Information is provided on current uses of REOB, available qualitative and quantitative methods to detect presence of calcium, copper, molybdenum, phosphorus, and zinc in asphalt binders, and suggestions as to how these elements might indicate the presence and amount of REOB in asphalt binders.

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