Magdy Abdelrahman North Dakota State University Civil Engineering Associate Professor email@example.com Poster Title: Characterization of Interaction between Asphalt and Tire Rubber Abstract: Scrap tires are non-degradable and are considered as main problem of the solid waste management system. Most markets for recycling scrap tires are limited or closed except for burning as fuel or recycling in asphalt applications as Crumb Rubber Modifier (CRM) for asphalt binder. CRM modification of asphalt enhances its performance while consuming a significant amount of scrap tires. The modification mainly happens through exchange of components between CRM and asphalt and swelling of CRM in the asphalt. To control the modification and attain maximum performance, it is necessary to thoroughly understand the CRM and asphalt interaction at the molecular level. To achieve such goal, advanced characterization methods such as; Thermo-Gravimetric Analysis (TGA), Gel Permission Chromatography (GPC), Fourier Transform Infrared (FTIR) Spectroscopy and Dynamic Shear Rheometer (DSR) are being used to characterize the types, amounts and effects of components exchanged between CRM and asphalt. Graduate students Amir Ghavibazoo and Mohy Ragab are involved in this research.