FLEXURAL FATIGUE OF CONCRETE FOR AIRPORT PAVEMENTS

Through a series of experiment in laboratory, this paper mainly clarifies the effects of the factors such as maximum stress level, minimum stress level, loading frequency and rest period on the fatigue life of concrete for airport pavement, and analyzes the failure probability due to flexural fatigue under different stress level. As a result, it is found that under high stress level, namely the maximum stress level is equal to or greater than 80%, the minimum stress level has no clear influence on the fatigue life of concrete, but when the maximum stress level is 70% its effect can not be ignored. Accordingly, the flexural fatigue equation of concrete for airport pavement, considering the minimum stress level, is derived.