Abstract
For many years fly ash has been effectively used as a partial replacement of portland cement in the production of different types of concrete, as well as in embankments and soil stabilization. On the other hand, the use of Coal Combustion Products (CCPs) in asphalt pavements has been very limited. Few researchers investigated the application of CCPs in asphalt.This research reports on the effect of CCPs on the high temperature performance of asphalt binders. In this paper 15 CCPs were identified, characterized and investigated for their compatibility with different types of asphalt cement and compared to control mineral filler. Furthermore, the study explored the effect of dosage, physical properties and chemical composition of CCP on the stiffness, phase angle and rutting behavior of mastics.The investigation of the rheological performance of asphalt binders with different types of CCPs using Dynamic Shear Rheometer (DSR) confirmed the feasibility of using these by-products to improve the permanent deformation resistance of asphalt binders. Research data demonstrate that the effect of the CCPs is dependent on the dosage and physical and chemical properties of CCP. Based on the rheological response of CCP based mastics at high temperatures this study found a strong physical and chemical interaction between the CCP and the asphalt binder.
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