Effect of warm additives on rutting and fatigue behaviour of asphalt mixtures

This paper studies the rutting deformation and resistance to fatigue of warm mix asphalt with different additives (tensoactives, waxes and zeolite). Warm-mix type Asphalt Concretes were manufactured at different manufacture and compaction temperatures. Wheel tracking and four-point bending tests were carried out according to the European standard. The tensoactive and zeolite mixtures led to better results under permanent deformation than waxes, but all modified asphalt mixtures showed higher values of rutting than hot mix asphalt. In the fatigue test, the asphalt mixtures with waxes and zeolite displayed similar behaviour to hot mix asphalt, but the asphalt mixtures modified with tensoactives showed less fatigue life.