Development of a Physical Property Specification for Asphalt-Rubber Binder

摘要

The performance of projects incorporating asphalt-rubber binders has beeninconsistent. 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 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. The conclusions were that the physical properties of an asphalt-rubber binder can be characterized using a dynamic shear rheometer and that the properties studied are related to performance at low, medium, and high temperatures to the extent of binder contribution to pavement performance. Rheological specifications are proposed for use on a trial basis.