精细分离回收料再生沥青疲劳的动力学表征及寿命预估OA

To accurately characterize the fatigue performance of recycled binder blends based on refined reclaimed asphalt pavement(RAP)separation technology,the Arrhenius model derived from the representative change rate of damage density was established to determine the activation energy of the fatigue damage process of bituminous binders,then mass-composite activation energy of fatigue damage and lifetime prediction model were developed for blended binders.Results show that the fatigue damage activation energy of recycled binder blend increases as compared to that of recycled binder,which indicates the enhanced fatigue resistance due to the addition of virgin binder.SBS polymer could reduce the effect of aging on fatigue performance of bituminous binder.In contrast to traditional mechanistic characterization indicators,kinetic indicator of fatigue damage activation energy could be used to understand the restoration of fatigue performance for recycled binder blends.As to different recycled binder blends,the calculated fatigue damage activation energies fit well with the results predicted by mass-composite activation energy,the relative errors between which are less than 10%,and their fatigue lives obtained from fatigue tests are similar to the predicted results based on the fatigue damage activation energy,validating the reliability of the proposed kinetics characterization method.Aged binder from refined RAP separation technology has a profound effect on the fatigue performance of recycled binder blend,which should be carefully considered during the design of recycled asphalt mixture.