RUTTING AND FATIGUE PROPERTIES OF CRUMBED RUBBER HOT MIX ASPHALTS

Abstract

Australian researchers sought to measure the performance of crumb rubber (hot mix) asphalts, after many years of successfully using crumb rubber binders in sprayed seals. Rubberized asphalts resisted rutting better than conventional (unmodified) asphalt and about as well as polymer modified binder asphalts. Wheel tracking performances were similar for dry mix and wet mix asphalts, but the fatigue life for dry mix was three times as long as wet's. The type of rubber crumb used to make binders did not affect wheel tracking very much, but had a significant effect on fatigue resistance.