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Effect of Waste Engine Oil Residue on Quality and Durability of SHRP Materials Reference Library Binders

This paper discusses the effects of widely used waste engine oil (WEO) residue on asphalt binder properties. Five SHRP Materials Reference Library binders and one commercial material from Ontario, Canada, were modified with 15% WEO. Materials were aged according to a standard rolling thin film oven protocol followed by 20 and 40 h of pressure aging vessel (PAV). Binder quality was determined according to AASHTO specification M 320 as well as dynamic shear characterization. Durability was assessed after additional conditioning at high temperature in the PAV and at low temperature in the bending beam rheometer. All but one of the WEO-modified materials transitioned to a gel-type state more readily upon chemical and physical conditioning; this result explains the poor thermal cracking performance seen for such binders on Ontario roads.