Evaluating the effects of using recycled asphalt pavements on fatigue properties of warm mix asphalt

Abstract

This paper presented an experimental study to characterize the stiffness modulus and fatigue life of warm mix asphalt mixture containing recycled asphalt pavements (RAP) with and without a rejuvenating agent. For this purpose, warm mix asphalts were produced using Sasobit and Asphamin as two of the most common additive materials. The following five mixes were prepared and tested: a mix with 30% RAP, two mixes with 30% RAP plus warm mix asphalt additives, and two mixes with 30% RAP plus warm mix asphalt additives and a rejuvenating agent. The results indicated no significant difference in the stiffness modulus of warm mix asphalt mixtures containing RAP and conventional mixtures including recycled asphalt pavement. However, the indirect tensile fatigue test results showed that the addition of the warm mix asphalt additives and rejuvenating agent improved the fatigue life of the mixtures at different temperatures.