Evaluation of Rheological Behaviour Asphalt Binders Containing Gilsonite and Crumb Rubber

The purpose of this paper is to investigate the effect of rubber powder and Gilsonite powder on the rheological properties of bitumen. In this study, the gilsonite powder was used as additive in percentages (0 %, 10 %, 20 %, 30 % and 40 %)in bitumen. Also, in order to limit the degree of penetration to 30 - deci mm at 25 C, the Gilsonite percentage is considered to be 30 % fixed and the percentages of rubber powder are considered to be 30 %, 10 %, 15 %, 20 %). In order to investigate the performance characteristics of bitumen, the penetration, softening point, ductility, dynamic shear rheometer, bending beam rheometer, rotational viscosity, multiple stress creep recovery (MSCR) tests were performed. Results showed that the G */ Sind parameter increases with addition to gilsonite. Also, rubber powder causes an increase in the value of G * / Sind parameter and the rutting parameter increases by addition of crumb rubber percentage. The addition of gilsonite powder causes an increase in values of G *. Sind and adding crumb rubber powder cause a decrease in values of G *Sin d. it is found that the parameter (Jnr) decreases with addition of gilsonite and rubber powder. The lower values (Jnr) indicates the further resistance of the mixture made with the bitumen or less rutting sensitivity. The results show better values for rubber powder additive compared to Gilsonite.