The California Asphalt Pavement Association
Representing the asphalt pavement industry in California since 1953

Rubberized Hot Mix Asphalt (RHMA) Page

A popular choice for a smooth and quiet ride 

The use of rubber products, including rubber from recycled tires, has become a popular choice for asphalt pavement in California. This page highlights some of the many resources available to learn more about how rubberized pavements are designed, made, placed and maintained.

Caltrans asphalt rubber guide


Click HERE to download the Caltrans "Asphalt Rubber Usage Guide" (Sept. 30, 2006). 

Caltrans scrap rubber report


Click HERE to download the Caltrans report "Use of Scrap Tire Rubber -- State of the Technology and Best Practices (Feb. 8, 2005).

Caltrans report on recycling


Click HERE to download the Caltrans report "Feasibility of Recycling Rubber-Modified Pavement Materials" (Feb. 2, 2005) 

Introductory RAC video


Click HERE to watch the introductory video on rubberized asphalt concrete produced by the California Integrated Waste Management Board and titled "RAC 101."

Articles on RWMA test at UC Davis


Click HERE to read the Asphalt Insder newsletter article published April 12, 2010, about a rubberized warm mix asphalt test track construction at U.C. Davis. Click HERE to read a follow-up article published on April 19, 2010.

Article on rubber symposium


Click HERE to read an Asphalt Insider article published May 17, 2010 on a rubber asphalt symposium sponsored by Syar Industries in Napa.

Free mix-cooling estimate software


Click HERE to learn more about MulitCool, a free and user-friendly software tool provided by the National Asphalt Pavement Association (NAPA) that calculates the rate of cooling in an HMA or RHMA mat during construction.

Article on rubber project on U.S. 101


Click HERE to read an article in the Asphalt Insider published April 26, 2010, about a successful rubberized warm mix asphalt rehabilitation project on U.S. 101 near Eureka.

New Caltrans Section 39 spec


Click HERE to download the new Caltrans Section 39 specification, which has updated refrences to Rubberized Hot Mix Asphalt, test methods and more. 

Caltrans report on rubber usage 

Click HERE to read the most recent legislatively mandated report by Caltrans on the use of waste tires in transportation projects. The report is required each year by SB876.

Asphalt Rubber pavement training manuals 

Click HERE to view a list of training modules on asphalt rubber pavements provided by CalRecycle (formerly the California Integrated Waste Management Board). Topics include usage, specifications, design, placement and testing.


Dr. Dave Jones of the University of California Pavement Research Center inspects the Caltrans Heavy Vehicle Simulator on the campus of the University of California, Davis on July 12, 2011. The HVS is simulating 20 years of heavy truck traffic over a few weeks on test sections of rubberized Hot Mix Asphalt to evaluate its performance.