The fatigue behavior of SBS/nanosilica composite modified asphalt binder and mixture

In this study, the effect of SBS polymer, nanosilica, and SBS/nanosilica nanocomposite on the fatigue life of asphalt binder and asphalt mixture was investigated. Linear amplitude sweep (LAS) test was used to evaluate the fatigue life of asphalt binder and a fatigue model was developed by the viscoelastic continuum damage model. The four-point flexural bending test at three strain levels was also used in asphalt mixtures. In addition, correlation equations were developed between the fatigue behavior of asphalt binder and asphalt mixtures. The results showed that the fatigue life of asphalt binder and asphalt mixture were increased significantly by adding SBS/nanosilica nanocomposite and experimental results indicated that the optimum content of nanosilica was 6%. In addition, a good correlation was observed between the fatigue life of asphalt binder and asphalt mixture. (C) 2019 Elsevier Ltd. All rights reserved.