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RESEARCH.
RAF is currently developing a one-stop, comprehensive clearinghouse for rubberized asphalt research and documentation. As the library evolves, RAF will post waves of data to include white papers, specifications, research studies, industry news and legislation.
Please review the available information for an indication of what’s to come as RAF categorizes and posts a vast archive of data.
Produce asphalt rubber binder for use in Asphaltic Concrete Friction Courses and Asphalt Rubber Membrane Interlayers. Read More
Asphalt-Rubber Chip Seal (SAM and SAMI) applications have been “Main Stream” since 1985!
Asphalt-rubber binder and asphalt-rubber pavement preservation systems have been utilized by various city, county and state DOT’s since the early 1970’s. After years of consistent use and verified long term performance asphalt-rubber systems have become a standard for many of these agencies. This use pattern is especially true in Arizona and California as agencies in these states have established their own standard use criteria and continue to include asphalt-rubber systems in their pavement preservation efforts. Read More
Asphalt Rubber Open Graded Friction Course
This paper describes a study to investigate the influence of field aging on the fatigue performance of asphalt concrete and asphalt-rubber concrete. Two California mixes were investigated: 1) Conventional asphalt concrete dense-graded mix (CAC-DG) and 2) Asphalt-rubber hot mix gap-graded (ARHM-GG). Read More
This Asphalt Rubber Usage Guide is intended for use by Caltrans design, construction, and maintenance managers and engineers, as well as by field personnel involved in placement of asphalt rubber paving materials including hot mixes and surface treatments. Read More
CRM Is Helping To Make Our Lives Cleaner, Quieter and Smoother
Have you ever wondered what happens to your old worn out tires? The harsh reality is, the majority of tires end up in disheveled, non-degradable rubber heaps that spread like unsightly tumors. Read More
Economic Analysis of Rubber-Modified Asphalt-Mixes
The Alaska Department of Transportation and Public Facilities (ADOTPF) is presently evaluating the use of recycled rubber in hot mix pavement applications. The benefits of adding rubber to the mix include increased skid resistance under icy conditions, improved flexibility and crack resistance, elimination of a solid waste, and reduced traffic noise. Read More
Effect of Crumb Rubber Modifiers (CRM) on Performance-Related Properties of Asphalt Binders
Crumb rubber derived from used vehicular tires has been used for a wide variety of industrial applications (1).
In the early 1960’s, pavement engineers in the United States started experimenting with the use of crumb rubber as
a modifier to asphalt cement used in pavement applications (2). Read MoreField Aging Effects On The Fatigue of Asphalt Concrete and Asphalt-Rubber Concrete
Historically open graded friction course hot mix materials have had poor performance when utilizing conventional asphalt cement or polymer modified asphalt cement as the binder. High air void contents (14 – 18 %) can lead to moisture damage and premature aging which will accelerate the stripping of the mix from the roadway and inevitably unsafe driving conditions. Read More
High-Cure Crumb Rubber Modified Asphalt for Dense-Graded Mixes
The Texas Department of Transportation (TxDOT) uses tire rubber in asphalt pavements in a variety of ways, some of which
require special design or construction practices. These include immediate use after blending to avoid rubber settling, or use in open- or gap-graded mixes
to avoid compaction problems. Read MoreReport on the Status of Rubberized Asphalt Traffic Noise Reduction in Sacramento County
This report is a joint study prepared for the Sacramento County Public Works
Agency, Transportation Division by the Sacramento County Department of
Environmental Review and Assessment and Bollard and Brennan, Inc.,
consultants in acoustics and noise control engineering. Read MoreThe project included widening 12 miles of road in both directions and then resurfacing with an open-graded asphalt rubber overlay. Read More
The Effects of Digesting Crumb Rubber in Modified Binders
With the advent of new processes for incorporating varying amounts of scrap tire rubber (TR) into binders for hot mix asphalt and seal coats, there appears to be a lack of clarity about the best method of using TR. Read More
Acknowledgement
The University of Massachusetts Dartmouth Highway Sustainability Research Center ("HSRC") has compiled and maintains the information on in this website’s library and database function (the "Library"). The Rubberized Asphalt Foundation wishes to express its gratitude to HSRC for its continued excellent assistance with the compilation and maintenance of the materials in the Library.