Reducing Rutting in Flexible Pavement Using Specified Polymers with HMA

Abstract

Abstract Iraqi roads mainly suffer from rutting distresses which resulting from extremely axle loading and high difference in temperature between seasons and even in day and night for the same day. Different types of modifier polymer have been inserted into asphalt materials to enhance the characteristics of asphalt concrete mixture as a whole. Thus, this paper has generally been dedicated to investigate the effect of using two types of polymers; Styrene-Butadiene-Styrene (SBS) and High-Density Polyethylene (HDPE) on the rutting distress. Accordingly, five ratios (4%, 6%, 8% and 10%) of SBS and HDPE have been used as a percentage of total mix in order to get the optimum influence of each ratio. Hence, the best ratios for surface (Type III A) layer are 8% HDPE and 6% SBS; whereas these ratios for binder layer are 6% HDPE and 2% SBS. The results indicate that the reduction in rutting percent are (72% and 65%) for HDPE and SBS for each type of additives at 40°C. Accordingly, this means these types of polymers have a significant role in reduction of rutting in surfacing and binder layers.