Modification ability of coal-derived heavy products for Binzhou 90

In comparison with the supreme commercial paving asphalt modifier TLA, three heavy products derived from the co-processing of coal with FCC slurry and one heavy product from a bench scale continuing coal liquefaction process have a similar modification ability to the same base asphalt (Binzhou 90#). Two modified asphalts (one by coal tar pitch and another one by the product from the co-processing) are excluded due to the dissatisfaction on ductility. FT-IR analysis shows that the addition of coal-derived heavy products does not form any new functional group, but results in a new distribution of the functional groups which can improve the behavior of the base asphalt. The addition of TLA can increase C-O and S-O functional groups, which should be favorable for the interaction of asphalt binder and limestone. The higher aromaticity of the coal tar pitch may inhibit its mixing and interaction with the base asphalt. Two unsatisfied modified asphalts have a lower colloidal index (CI). The difference between the theoretically calculated CI and the experimental CI of modified asphalt indicates that the chemical reaction may occur between the base asphalt and the additives.