Asphalt Rubber Technology Information Center
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.
© 2015 - Rubber Pavements Association (RPA). All rights reserved.