Investigation of fatigue life of asphalt mixtures based on the initial dissipated energy approach

摘要

The present research study addresses the fatigue life of different asphalt mixtures by means of 4PBF test. To this end, the fatigue behavior of unmodified asphalt mixtures and modified mixtures with styrene-butadiene-styrene polymer and crumb rubber as modifier were investigated in low and medium strain levels. Results showed that there is an excellent correlation between the fatigue lives of different asphalt mixtures in terms of the dissipated energy approach. It can be observed from result that the amount of initial dissipated energy at the 50th loading cycle predicted the fatigue life of asphalt mixtures without performing millions of loading cycles. Furthermore, the initial dissipated approach provides more reliable results from fatigue life of asphalt mixtures in comparison to the traditional fatigue tests.