Understanding the Limitations of Modifying Bitumen with Re-Refined Engine Oil Bottom (REOB)
Lucas Mortier, Xueyan Liu, Sayeda N. Nahar, Hinrich Grothe
TL;DR
This study examines how re-refined engine oil bottoms affect bitumen properties, revealing issues like phase instability and increased brittleness.
Contribution
First comprehensive comparison of European and North American REOB sources and their effects on bitumen performance.
Findings
REOB-modified bitumen shows increased carbonyl formation and phase instability due to saturates exudation.
Rheological tests show REOB softens bitumen but increases stiffness during ageing.
Low-temperature tests indicate REOB-modified bitumen is prone to brittle fracture.
Abstract
The evolving bitumen market is increasingly complex due to variations in crude sources and transitions in refining processes, affecting the properties of bitumen. Unexpected additions of materials to alter bitumen’s properties could occur, where traditional PEN grade testing fails to detect modifications by inclusion of, for example, Re-refined Engine Oil Bottoms. This is the first study to comprehensively compare REOBs from European vs. North American sources and assess their effects on binder performance in a unified framework, performed by assessing the REOB-modified binders by identification, stability, compatibility, ageing susceptibility, and low-temperature properties. Two series of REOB-modified bitumen were prepared by blending 5, 10, and 15 wt.% REOB into hard grade bitumen. Results showed increased carbonyl formations (likely caused by lubricant additives) and phase…
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Taxonomy
TopicsAsphalt Pavement Performance Evaluation · Petroleum Processing and Analysis · Infrastructure Maintenance and Monitoring