PHYSICAL-PROPERTIES OF ASPHALT-RUBBER BINDER

This study was performed to determine how the rheological properties o f asphalt-rubber binders are affected by various parameters. Propertie s studied were asphalt composition, rubber dissolution, and the low-, intermediate-, and high-temperature theological properties, measured w ith the bending beam rheometer, dynamic shear rheometer, and rotationa l viscometer, respectively. The theological properties of the asphalt- rubber binder were determined to be dependent on the rubber content (w eight percent), rubber particle size, and base asphalt composition. By controlling these variables, an asphalt-rubber binder with improved l ow-temperature cracking resistance, improved mid-temperature rutting r esistance and temperature susceptibility, and a non-detrimental high-t emperature compaction viscosity, all relative to the base asphalt, can be produced.