Evaluation of Recycled Rubber in Asphalt Concrete - Black Hawk County - Project HR-330D Author(s): Anderson, Chris Origin: Iowa Date: September, 1992 Categories: Performance Key Words: asphalt pavement, crumb rubber, recycled tires, asphalt rubber cement Summary: The disposal of discarded tires has become a major problem. Different methods of recycling have been researched. Currently, Iowa is researching the use of ground recycled crumb rubber from discarded tires in asphalt rubber cement. Six projects have been completed in Iowa using asphalt rubber cement. This project is located on IA 947 (University Ave.) in Cedar Falls/Waterloo. The project contains one section with asphalt rubber cement used in both the binder and surface courses and one section using asphalt rubber cement in the surface course with a conventional binder. There are two control sections where conventional asphalt pavement was placed.