Caltrans Pavement Rehabilitation Using Rubberized Asphalt Concrete Author(s): Van Kirk, Jack, P.E., Caltrans Origin: California Date: May, 1997 Categories: Performance Key Words: Recycle rubber in asphalt concrete Summary: Caltrans has considerable experience with the use of rubber in dense graded asphalt concrete hot mix (AC). This experience began in 1978 and has continued to the present. The experience to date has indicated that the most effective use of rubber is in asphalt concrete can be cost effective. On the early projects, Caltrans compared equal thickness of RAC to conventional AC. The RAC has outperformed the conventional mixes on these projects, but the question of cost-effectiveness is difficult to answer since most of the projects are still in service. In 1983, a project was constructed using reduced thickness RAC (as compared to the design thickness for the conventional AC). This project has shown that thinner sections of RAC can outperform thicker sections of conventional AC.