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.