Laboratory Evaluation of Modified Asphalt With SBS Polymer on Rutting Resistance of Recycled Pavement Mixture

Abstract

This research investigates the influence of recycled mixture modified with styrene-butadienestyrene (SBS) polymer on rutting resistance. The reclaimed asphalt pavement (RAP) mixture percentages were used 10, 20 and 30% by weight of original mixture and one percentage of SBS polymer which was 5% by weight of asphalt cement. The moisture susceptibility and rutting were taken into consideration in this study. The results indicated that the recycled asphalt mixture containing on SBS polymer gives better moisture susceptibility and better rutting resistance. It is noted that indirect tensile strength ratio (ITSR) increases when adding SBS with 5% percentage polymer and reaching its maximum ratio 94.5% for 20% RAP and the rut depth decreases by 66.7% when adding SBS with 30% RAP content.

Effect Of Resilient Modulus on Permanent Deformations Using VESYS 5W Program

“…Figure (4) shows that when the value of the resilient modulus of the surface layer is increased, it reduces the effect of high temperatures and traffic loads, which decreases the rut depth values due to the addition of SBS polymer to asphalt mixtures, which increases the bonding of the bituminous material and increases the hardness of the asphalt mixture and thus increases the resilient modulus. While Figure ( 5) indicates a decrease in the effect of permanent deformations (Rut Depth) for the base layer due to the addition of SBS polymer to the asphalt mixture, which increases the hardness of the layer and increases the resilient modulus.…”

“…Permanent deformation of asphalt concrete materials has been the subject of much research. The majority of research were carried out on a variety of materials and procedures (4). Historically, the concept "permanent deformation" was used to characterize any distortion of the pavement surface caused by mix instability, such as shoving and pushing.…”