Fatigue Behaviour Modelling in the Mechanistic Empirical Pavement Design
The Mechanistic empirical pavement design is based on modelling certain modes of failure for the different pavement materials. In the Australian and New Zealand guidelines, the mechanistic pavement design is based on modelling fatigue and permanent deformation as the two major modes of failures. The guidelines use the Shell fatigue performance function to model fatigue behaviour of asphalt mixes. However, there are wide range of asphalt mixes on New Zealand roads and they are all behave differently regarding their fatigue and permanent deformation performance. Therefore, the question here, can one fatigue model accurately fit the fatigue performance of all different asphalt mixes. This research examined the fatigue behaviour of two different types of dense graded hot mix asphalts, the first is made of aggregate with maximum nominal size 10 mm and the second with 14 mm maximum nominal sizes. The effects of air voids in the total mix and aggregate gradations on the fatigue behaviour were compared. It was found that the aggregate gradations have significant effect on the fatigue life with finer mixes have significantly higher fatigue lives compared to the coarser gradations. In addition, air voids in the total mix have a profound effect on the fatigue behaviour.
KeywordsFatigue Life Fatigue Behaviour Binder Content Pavement Design Fatigue Model
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