ABSTRACT
ABSTRACT: This study examined Crumb Rubber Modified (CRM) binders produced by mixing different percentages of crumb rubber with PG58-22 and compared them with PG6422 and PG64-16 binders. Superpave performance grading was used to determine the performance grade of these modified binders. The modified and unmodified binders were then used to make asphalt concrete specimens. These specimens showed an increase in indirect tensile strength and in Marshall stability with the use of CRM binders. The laboratory performance of the specimens were tested and compared. Rutting susceptibility, selected as indicative of the high temperature performance of the mixes, was compared by conducting an unconfined static creep test at high temperature. Intermediate temperature performances were compared by determining the absorbed energy during the indirect tensile strength test at two temperatures. The results were used to evaluate the suitability of the Superpave performance grading procedure in predicting the performance of CRM binders.
