Effect of Stress Levels and Temperatures on Stress Recovery of Asphalt Binders

Abstract

Abstract: HMA's rut resistance comes from the asphalt binder and aggregates. Rutting, which causes depressions in hot-mix asphalt (HMA) pavements along wheel paths, is a common type of distress. Both the loading and recovery phases of asphalt pavement performance are significantly impacted by the asphalt binder. In contrast to the extensive study conducted during the loading phase, the recovery phase receives comparatively little attention. Percent recovery tests asphalt binder elastic behaviour and stress dependence. Asphalt binder can self-repair and improve over time. Using a dynamic shear rheometer's multiple stress creep recovery method, virgin and modified asphalt binder were compared. Different temperatures and stresses were applied to the asphalt binders, and their responses were analysed. The results of the tests showed that the retrieval proportion of asphalt binder could be significantly increased by using admixtures, nanostructured materials, and viscous fluids. This case study shows that unmodified binders do not exhibit significant sensitivity to stress or strain under reasonable stress or tension conditions, nor do they showed considerable restoration under creep conditions; as a result, MSCR testing is not required for testing unmodified binders. Because of its potential as a modified binder performance indicator, Super Pave binder specification includes it. Furthermore, the data presented above demonstrates that certain modified binders provide better percentage recovery than neat binders. The viscous fluids were the ones that performed the best out of all the samples that we examined, closely followed by the nanostructured materials and the virgin binders