Fatigue evaluation of asphalt mixtures based on energy parameters

Cracks caused by fatigue is one of the most common failures in asphalt pavement Are. Scholars of different methods for evaluating fatigue life mixtures Asphalt have provided. The constant strain test, reduced the amount of hard 50 %) conventional criteria (criteria serve as pavement failure is defined. In this article Criteria based on energy concept Tlfshdh including "energy ratio", "loss ratio Energy "and" change the ratio of energy Tlfshdh "criteria to reduce the initial hard Rate of 50 % with Chharnqthyy bending and load test in the Persian month Tir Nymhsynvsy are compared. Results of experiments conducted in this study Show that the fatigue life based on the criterion "energy change than Tlfshdh" while Greatest difference with the fatigue life based on the criteria to reduce the amount of hard 50 % is also greater compliance with the criteria defined for it has failed. While life With other standards-based fatigue failure criterion is defined for them correspond. Given these results, the article barely reducing equivalent percentage point "Real failure" serve as a new criterion for determining fatigue life of mixtures Asphalt is proposed.