Chemical and Physical Properties of Asphalt-Rubber. Phase II. Product Specifications and Test Procedures

摘要

Asphalt-rubber was tested with conventional and non-conventional methods to begin development of testing methods for specification purposes and to find methods for studying the reaction between asphalt and reclaimed crumb rubber. A single asphalt-rubber formulation consisting of 75 percent AR-1000 asphalt and 25 percent crumb rubber from automobile tire treads (sized from No. 16 to No. 25) was used. Dependent variables included ring and ball softening point, absolute viscosity by capillary viscometer at 140 F (60 C), ductility and force-ductility at 39.2 F (4 C), elastic rebound, and low temperature viscosity with the Schweyer rheometer at 39.2 F (4 C). Recommendations are made for new tests, modifications of conventional tests and improved laboratory mixing and formulation techniques.