ABSTRACT
Bitumen binder mixing techniques attempt to balance the composition of bitumen and the modifier to achieve the long-lasting performance of modified bitumen binder, which led to enhance the pavement performance in roads construction. The main purpose of modification of bitumen binder is to produce mixtures with high resistance to deformation and cracking. The properties of the produced blends are depending on the physical and chemical properties of the used materials. The concentrations that used to produce modified bitumen binders were 0, 3, 5 and 7%.wt from the weight of bitumen, and various tests were used to evaluate the performance of base and modified asphalt binders including softening point, viscosity and Dynamic Shear Rheometer (DSR). The results of the best performance of modified bitumen binders 5% GPMB shows that the stiffness at high temperatures was improved as observed from the softening point and the viscosity, the enhancement was up to 20.21 and 31.33%, respectively. Also, the permanent deformation reduced nearly 3 times compared the base asphalt binder.
