Influence of warm mix additive and loading rate on rutting of warm mix asphalt pavement

Two major types of warm mix asphalt (WMA) technologies exists and they are wax-based and chemical-based. The wax-based additive melt completely in the binder at the mixing and compaction temperatures and hence enable construction at lower temperature. The chemical-based additives facilitate similar results during construction, however, by reducing the friction between the aggregates and binders. As it is well known, WMA technologies exhibit tendencies for increased rutting due to reduced ageing during construction, however, the wax-based additives exhibit better performance in laboratory trials since at pavement service temperatures, the wax crystallise and provide increased stiffness to the mastic. The presence of the wax and the associated temperature sensitive properties (crystallisation and melting) influence the viscoelastic response of the WMA at pavement service temperatures. This investigation focuses on such issues for one wax-based additive and one chemical-based additive along with a control ho...