Documentation of Open-graded, Asphalt-Rubber Friction Course Demonstration Project on Interstate 95, St. Johns County Author(s): Ruth, Byron E., University of Florida Origin: Florida Date: December, 1990 Categories: Performance Key Words: Ground tire rubber, asphalt-rubber mixtures Summary: The asphalt-rubber FC-2 mixture was produced and placed in the I-95 test sections without any major problem. It can be considered as a successful demonstration project even though there was a problem associated with the blending/reaction time for the asphalt-rubber. It was a originally anticipated that the asphalt cement would be at a temperature in the range of 300 F to 320 F. The blending unit was designed to maintain temperatures in the 265 F to 280 F range were encountered; the reaction time was extended requiring about 45 minutes instead of 5 to 10 minutes. Therefore, it will be necessary to either require a minimum asphalt cement temperature or more logically to provide a blending unit with greater capacity to accommodate the possibility of greater reaction times while maintaining suitable production capacity to accommodate the possibility of greater reaction times while maintaining suitable production capacity for at least 100 tons of hot-mix per hour. In addition, heating of the blending tanks would help maintain temperature during blending.