Asphalt Rubber Technology Information Center
A Review of Crumb-Rubber Modified Asphalt Concrete Technology
Papagiannakis, A.T. and Lougheed, T.J., Washington State University  
November, 1995  
Performance, Binder Properties  
Key Words:
Crumb-Rubber, susceptibility, viscosity  
This study presents an analysis of the characteristics of crumb-rubber modified asphalt pavements.  It is comprised of a
state of the art literature review and laboratory testing conducted with a Brookfield viscometer.  The reaction that occurs
between the rubber and asphalt is not a chemical reaction, but rather a diffusion process that includes the physical
absorption of aromatic oils from the asphalt into the polymer chain of the rubber.  The presence of CRM in asphalt
produces a thicker binder, which increases aging and oxidation resistance.  The presence of carbon black in CRM
improves binder durability.  The temperature susceptibility of the mix is reduces, causing more uniform fatigue
characteristics.  CRM applications have been met with various degrees of success because existing quality control and
quality assurance methods have not been developed enough to ensure desired binder properties in the field.
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