A Study Of Flexural Fatigue Behavior Of Asphalt Rubber Mixes

The objective of this study is to evaluate the fatigue behavior of crumb-rubber modified 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 0.5 in. (1.27 cm) maximum size and 7% design asphalt rubber content using CRM-III (minus #10 mesh) rubber. The ARB had a denser gradation with a 0.75 in. (3.81 cm) maximum aggregate size and 7% design asphalt rubber content also using CRM-III rubber.