effect of polymer on bitumen properties and its performance grade

with respect to the physical and mechanical limited qualities of bitumen, it benefits from certain specificability in application and its life service. polymers as the most important modifiers of bitumen are applied to it in order to improve its functional efficiency. among various polymers, styrene-butadiene- styrene (sbs) is the best modifier of the bitumen. in this work, sbs polymer as one of the modifiers of elastomeric thermoplastics with different weight percentages (2% to 5%) have been mixed with bitumen (60/70) of isfahan refinary and its effect on different properties of the bitumen for example penetration index, softening point, frass breaking point and reduction in weight perecentagehas been studied. furthermore, in this paper, the modified bitumen property on performance grade is the preferred category. classification of modified bitumen based on performance grade makes it possible to provide perfect bitumen pattern in different climates.