DEVELOPMENT OF A PERFORMANCE-RELATED ASPHALT MIX DESIGN SPECIFICATION FOR THE ILLINOIS TOLLWAY
مهندس بهنام جهانگیری، کاندیدای دکترا در مهندسی عمران در روسازی و تکنولوژی آسفالت، دانشگاه میزوری، آمریکا
سه شنبه 11 شهریور 1399، ساعت 15:00 تا 16:30
نحوه ورود: مجانی و بدون نیاز به پسورد، بر روی گزینه “میهمان” کلیک و نام خود را وارد کنید.
Behnam Jahangiri is a PhD candidate in the Department of Civil and Environmental Engineering at the University of Missouri-Columbia (MU, Advisor: Bill Buttlar). He also holds an MSc degree in Pavement Engineering from Sharif University of Technology (Advisor: Nader Tabatabaee), and a BSc degree in Civil Engineering from Isfahan University of Technology. As a Graduate Research Assistant at Missouri Asphalt Pavement and Innovation Lab (MAPIL), he has been working on cutting-edge research areas related to smart infrastructure systems and innovative construction materials to address real-world concerns in the asphalt industry. Currently, his research is focused on the development of performance specifications for the Illinois Tollway. He is also involved in the characterization of a wide variety of modern and heterogeneous asphalt mixtures containing recycled materials RAP, RAS, rubber, and waste plastic for the Missouri Department of Transportation and for industry. Finally, he conducts research in advanced machine learning/artificial intelligence methods for material characterization, and deployment of sensors for civil infrastructure condition assessment.
In the past, traditional asphalt mixtures involved relatively simple combinations of virgin asphalt binder and aggregates to meet performance requirements. However, modern, heterogeneous asphalt mixtures exhibit more complex behavior due to proliferation of new ingredients and because of the interactions that subsequently occur. As a result, recent asphalt mixes require advanced performance tests to account for the effects of the added components, increased traffic loads, and prevailing environmental conditions. In this presentation, different mixtures produced in 2018 for the mainline and shoulder sections across Tollway system in Chicago were selected to characterize trends of the performance tests conducted on the new Tollway mixtures and to study the ability of different performance tests to predict pavement performance. To this end, performance tests were performed on the collected plant produced mixtures, and later, on selected field-cored sections. The latter included both good and poor performing sections, which were determined based on an extensive survey of the Illinois Tollway in May of 2019. Evaluation of Tollway asphalt surface pavement management data indicated excellent overall performance vs. time, with minor amounts of several cracking forms developing gradually over time. These included transverse cracking, usually associated with reflective cracking on the mainline and/or thermal and block cracking on shoulders, and longitudinal cracking (typically along the construction joint between lanes). Rutting, on the other hand, was not observed to be a significant form of distress on modern Tollway sections. The Disk-shaped Compact Tension (DC(T)) test was chosen to be retained in the performance related specification (PRS) for the design of crack-resistant mixtures because of its excellent repeatability and its high correlation with field results. A systematic approach was developed, which allowed different reliability levels to be addressed in the specification, along with a consensus step to take advantage of the experience of local practitioner.