Study of Flexural Fatigue Behavior of Asphalt-Rubber Mixes

摘要

The objective of this study is to evaluate the fatigue behavior of crumb-rubbermodified asphalt. The research involved flexural fatigue testing of beams made with hot-mix asphalt rubber using the wet process where the crumb rubber reacted with the asphalt at high temperature. Two types of asphalt-rubber were studied: Asphalt Rubber Surface (ARS) and Asphalt Rubber Base (ARB). The ARS was a gap-graded aggregate mix with 1/2 in. maximum size and 7% design asphalt-rubber content using CRM-III (minus No. 10 mesh) rubber. The ARB had a denser gradation with a 3/4 in. maximum aggregate size and 7% design asphalt-rubber content also using CRM-III rubber. A conventional asphalt concrete mix (BM-1B) was used as a control and contained 5% ac-10 with no rubber and 1.2 inc. maximum aggregate size.