Document Type : Research Article
Department of Civil Engineering, University of Bojnord, Bojnord, Iran
Department of Civil Engineering, University of Guilan, Rasht, Iran
The common types of pavement distresses include: fatigue cracking and rutting. Some of the typical causes of pavement deterioration include: traffic loading; environment or climate influences; drainage deficiencies; materials quality problems; construction deficiencies; and external contributors, such as utility cuts. The most common method for decreasing these types of distress in asphalt mixtures is using suitable additives. Nanomaterials, in recent years, have been widely used to improve rheological properties of asphalt binder. This study is aimed to investigate the effect of nano hydrated lime, which is prepared from hydrated lime in a low cost method using a planetary ball mill, on rheological behavior of asphalt binder. Therefore, in this research, the dynamic shear rheometer (DSR) test was used to determine the characteristics of control and modified asphalt binder at moderate and high temperatures. The bending beam rheometer (BBR) test was also used to determine their characteristics at low temperatures. The results indicate that the use of nano hydrated lime, especially in the amount of 10% (by weight of asphalt binder), increases the resistance to rutting fatigue cracking. Also, Modified asphalt binder at low temperatures based on the two creep stiffness parameter and m-value has a better performance than control asphalt binder.