ABSTRACT
The physical and the rheological properties of four binder types had been investigated. Both short—and long-term aged binders showed lower penetration value, higher softening point and stiffer characteristics. A 70/100 binder showed higher penetration ratio and softening point increment for short—and long-term aging. A particular attention was given on the force-ductility behaviors of aged binders. Results indicated that the long-term aged binders showed higher ductility-force of 6.8 N, 5.3 N, 2.8 N and 13.7 N for 30/45, 50/70, 70/100 and PmB binders, respectively. Among binder types, hard grade bitumen (30/45) and polymer modified binder (PmB 45 A) showed relatively higher shear modulus (G) and viscous parameter (η) due to their stiff properties they already inherited. The rate of deformation and recovery of both binders were relatively lower than softer grades. The initial shear modulus values of unaged binders were lower than that of the corresponding values after long-term aging.
