Experimental evaluation of the effect of Sasobit and Rheofalt Warm Mix Asphalt (WMA) additives on fatigue Performance of Reclaimed Asphalt pavement (RAP) mixtures

In this study, the effect of the use of two WMA additive sasobit and rheofalt additives on the fatigue properties of the asphalt mixes was evaluated. For this purpose, laboratory samples containing 100 % RAP and a hot mixture were constructed using RAP material, which is separated from the bitumen. The recycled mixtures include a hot recycling sample and three warm (1 non - additive sample, 1 sample containing sasobit additive, 1 containing rheofalt additive). In this research, different experiments such as indirect tensile strength, resilient modulus and fatigue are investigated. Fatigue test was performed on four - point bending test with constant strain level at three levels 600, 800 and 1000 micro - strain with sinusoidal loading. The fatigue life of specimens was evaluated based on a 50 % reduction in the initial hardness modulus. The results showed that sasobit and rheofalt additives had a positive effect on the compression and functional properties of the blends. In the performance of fatigue and low - temperature cracks, the hot mixture was better in spite of the positive effects of additives.