The performance of projects incorporating asphalt-rubber binders has been inconsistent. Thus, a method was needed to provide an understanding of binder physical properties associated with the desirable performance and to quantify them for specification purposes. It was proposed to use the capabilities of a dynamic shear rheometer for comparing the asphalt-rubber binder properties with project performance data to determine the potential for rheological specifications on job samples of the binder. Representative binders from six dense-graded and gap-graded hot mix projects were analyzed.

A dozen papers from a December 1993 symposium in Dallas/Fort Worth, Texas. Among the topics are why the new proposed rheological properties of asphalt binders are required and how they compare to conventional properties, the development and use of the SHRP direct tension specification test, oxidatio

Introductory technical guidance for civil engineers, highway engineers and construction managers interested in use of recycled tire rubber in asphalt concrete pavement for streets and highways. Here is what is discussed: 1. BACKGROUND, 2. SPECIFICATIONS AND TESTING OF GTR-MODIFIED ASPHALT BINDERS, 3. ASPHALT MIXTURE CONSIDERATIONS, 4. DISCUSSION., 5. SUMMARY, 6. REFERENCES, 7. GLOSSARY OF TERMS.