Summary: A research project was performed which indicated that ground tire rubber added to asphalt concrete significantly improves the material parameters which are generally used to evaluate an asphalt concrete mix for use in pavement. The study also indicated that the life of a pavement built with asphalt-rubber concrete and experiencing high or low temperature conditions might be greatly increased over that of an asphalt concrete pavement under the same conditions. In this study, a “good” asphalt-rubber concrete mix and a “good” asphalt concrete mix were designed and tested in the laboratory and the material properties were compared. The testing program included Marshall stability, density and air voids content, resilient modulus, bean fatigue testing, overlay testing for fracture behavior, creep testing for temperature susceptibility characteristics, and repeated load testing for permanent deformation properties. In general, the test results showed that the asphalt-rubber concrete is less temperature susceptible that the asphalt concrete. Also, at a low temperature, the rubber appears to make the asphalt concrete more resistant to cracking.