TY - JOUR ID - 2736 TI - Comparison of Rut Susceptibility Parameters in Modified Bitumen with PPA JO - AUT Journal of Civil Engineering JA - AJCE LA - en SN - 2588-2899 AU - Khodadadi, M. AU - Moghadas Nejad, F. AU - Khodaii, A. AD - Department of Civil & Environmental Engineering, Amirkabir University of Technology (Polytechnic), Tehran, Iran AD - Department of Civil & Environmental Engineering, Amirkabir University of Technology (Polytechnic), Tehran, Iran ABSTRACT: Y1 - 2017 PY - 2017 VL - 1 IS - 2 SP - 129 EP - 134 KW - Rutting of Asphalt Mixture KW - Rheological Properties of Modified Bitumen KW - Superpave Protocol KW - Zero Shear Viscosity KW - Poly Phosphoric Acid DO - 10.22060/ceej.2017.12383.5198 N2 - Pavement as a multi-layer structure is subjected to various distress mechanisms suchas permanent deformation (Rutting) in its service time. Rutting resistance evaluation is one of theimportant components of pavement management system which plays a substantial role in the effectivestrategic development of pavement rehabilitation and maintenance. Improving the rheological propertiesof bitumen using one of the various additives is one of the practical approaches to reduce the ruttingpotential in the asphalt mixture. In this study, basic bitumen with an 85/100 penetration grade (PG58-22)was modified by 0.5, 1.0 and 1.5% poly phosphoric acid by weight of bitumen. The rutting resistanceimprovement of modified bitumen was investigated according to Superpave protocol. For this purpose,temperature sweep and frequency sweep tests were performed on all bitumen at 46, 52 and 58 oC. Also,rutting resistance improvement ratio was calculated based on the Superpave specification (|G*|/sinδ),Shenoy specification (|G*|/[1-(1/sinδ×tanδ)]) and zero shear viscosity. This ratio was employed to rankthese specifications. The results of this study represent an improvement in rutting resistance of modifiedbitumen. According to specification ranking results, it can be concluded that zero shear viscosity has morepotential and credibility to predict rutting damage occurrence as compared to Superpave specificationand Shenoy specification. UR - https://ajce.aut.ac.ir/article_2736.html L1 - https://ajce.aut.ac.ir/article_2736_e0fe1ef2bfb7664bdee7070c0ce8f7ee.pdf ER -