: Now a days, because of some important issues such as increase of demand for road traortation, some fundamental drawbacks in bitumen and occurrence of significant failures in asphalt concrete overlays; trying to find the most effective way to improve bitumen properties, is the most important goal for road designers and conductors. Among different bitumen modifiers, polymers seem to be of important interest. Low density polyethylene (LDPE) is one of famous polymers that in last decades many researchers in all over the world had made various experiments to investigate the effects of this polymer on bitumen as a modifier. Fortunately, results revealed positive effects on bitumen properties. In this research, we aim to analyze the viscoelastic characteristics of polyethylene modified bitumen under static loading. To achieve this, after considering different variables such as type of polymer, weight of polymer (0, 2, 4, 6, 8 percent by the total weight of the neat bitumen), time and temperature of mixing, method of mixing and ambient temperature, samples were produced and analyzed. After calculating creeps and creep compliance at each certain time duration, with the use of successive residuals method, the number of Kelvin models required to describe the viscoelastic characteristics of polymer modified bitumen (PMB), elastic module (E) and viscose property (T) were calculated for each sample and by using E and T of each sample, a comparison were made between all samples. Keywords: Modified bitumen, Low density polyethylene (LDPE), Viscoelastic characteristics, Successive Residuals Method.
