Validation of Applicability of Superpave (Trademark) Binder Test Protocol forPerformance Grading of Crumb Rubber Modified Asphalt Binder

摘要

The Superpave (trademark) binder specifications were primarily developed forunmodified binders. It's applicability to modified binders had not been tested. Since the use of the modified binders is increasing in the Hot Mix Asphalt (HMA) industry, it was necessary to determine whether the Superpave test protocol and specifications hold good for the modified binders too. Two aspects of the use of crumb rubber modified binders were evaluated: (1) The applicability of the test protocol for asphalt binders to crumb rubber modified binders using DSR; (2) The characterization of crumb rubber modified binders over a range of temperatures and frequencies to evaluate the effect of crumb rubber particle size on the high temperature performance characteristics.