Abstract
The current study investigates the application of asphalt binders from different sources modified with asphaltenes in high modulus base courses (HMAC). For this purpose, one crude oil asphalt binder and four asphalt binders derived from various sources of Alberta oilsands were studied. Witczak regression model was used to determine the minimum performance grade to meet the dynamic modulus requirement for HMAC. Asphaltenes were added in different quantities for modification of the asphalt binders. The effect of asphaltenes modification on the viscosity of the binders was studied using a rotational viscometer. Also, the chemical composition of the asphaltenes-modified binders was determined by SARA analysis. The results of the rheological analysis indicated that asphaltenes effect on binders performance at high temperatures was more than its negative impact at low temperatures. Furthermore, it was determined that binders from the Alberta oilsands modified with asphaltenes could achieve the performance grade requirements for HMAC applications.
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