چكيده به لاتين
Fatigue cracking, resulting from repeated traffic loading, is a primary distress in asphalt pavements. The evaluation of fatigue properties of asphalt mixtures under different traffic loads and varying environmental conditions is of great importance in designing the flexible pavements. In the case of fatigue, it is well known that the distress usually initiates at the binder phase or the aggregate-binder surfaces especially at intermediate and high temperatures. Among, the binder phase possesses the highest contribution on asphalt mixture performance. It governs the viscoelastic behavior of the entire material and is responsible for the material’s strength and integrity. Due to different factors such as, increase in cost of asphalt, increase in traffic load and also the decrease in pavement management and rehabilitation operations, utilizing modified asphalt is inevitable. This, requires specific evidence about the impact of modifiers on asphalt. Regarding the research conducted on this field, superpave experiments cannot precisely analyses the modified asphalt behavior. Thus, other experiments such as, Linear Amplitude Sweep (LAS), for exploring the bitumen fatigue are proposed. In this research study, the relation between fatigue in hot asphalt mixtures and fatigue in bitumens modifid with Gilsonite and SBS are investigated. For this porpuse four-point beam fatigue test and Linear Amplitude Sweep test (LAS) and fatigue life with Dynamic Shear Rheometer (DSR) were conducted and the trends between the fatigue life of asphalt mixtures and binders were studied by statistical analysis. The results show that there is good relationship between fatigue life of beam fatigute test and LAS test. On the other hand, the fatigue life of Beam Fatigue Test and DSR do not have good relationship.