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Research Reports

Rubber Modified and PBA-6 Asphalt Binder Pavements: SR-5, Lewis County Line to SR-12

Description: This report documents the construction of two experimental test sections of asphalt concrete pavement containing polymer and ground rubber additives. The two sections are located on I-5 south of Olympia, Washington and were constructed in the summer of 1992.

The test sections were paved with an open-graded mix using PBA-6 and PBA-6GR asphalt cement binders. PBA-6 is a performance based asphalt cement with a polymer additive. PBA-6GR is also a performance based asphalt cement but with ground rubber tires as the additive. The PBA-6GR is a new product developed by the U.S. Oil and Refining Company of Tacoma, Washington.

The completed test sections are performing well, although the PBA-6GR section is flushing due to too high of an initial asphalt content. The sections will be monitored for a minimum of 10 years to determine long-term performance.



  • Date Published: April, 1994
  • Publication Number: WA-RD 347.1
  • Last Modified: October 29, 2007
  • Authors: John Livingston, Keith Anderson.
  • Originator: Washington (State). Dept. of Transportation. Materials Laboratory.
  • # of Pages: 29 p., 512 KB (PDF)
  • Subject: Asphalt concrete, Asphalt rubber, Bituminous binders, Crumb rubber, Experimental roads, Open graded aggregates, Pavement performance, Polymer asphalt, Test sections, Time duration, Tires.
  • Keywords: Crumb rubber, performance based specifications, polymer, open-graded, asphalt pavement, I-5, Olympia (Wash.)
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This abstract was last modified April 29, 2008