Re-refined Engine Oil Bottom: Detection and Upper Limits in Asphalt Binders and Seal Coat Binders
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2019-04-01
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Edition:Technical Report: September 2015–October 2017
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Abstract:Many state departments of transportation have adopted the Superpave PG specification since the completion of the Strategic Highway Research Program in 1993. A much wider range of crude oil sources and binder modification techniques are being used now to produce asphalt binders. Although asphalt binders used these days still meet the requirements of the PG specification, many premature failures have been reported by many states. Texas Department of Transportation (TxDOT) initiated a study on re-refined engine oil bottom (REOB) in 2015. The objectives of this study were to establish REOB detection methods and recommend maximum allowable amount of REOB in asphalt binders and seal coat binders. Based on existing literatures, researchers developed and verified scientific methods to detect and quantify the amount of REOB in both asphalt binders and seal coat binders using a handheld or a benchtop X-Ray Fluorescence (XRF) instrument. Furthermore, a comprehensive study was performed to define the impact of REOB on asphalt binders, asphalt mixtures, and seal coat performance. Multiple sources of binders, aggregates, and REOB (including recycled binders, PPA, and GTR) were used in the evaluation. Laboratory test results clearly indicated that the addition of REOB has detrimental effects on rutting, cracking, and seal coat adhesion properties. Not only should the current upper limit of 5 percent REOB in asphalt binders be kept, but an upper limit of 5 percent REOB in seal coat binders needs to be established. The implementation of these XRF tools and recommendations on the upper limits of REOB in binders will make pavements last longer as intended.
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