ABSTRACT
Fatigue damage of the cement concrete pavements is progressive under vehicular loads and these pavements are designed based on cumulative fatigue damage principle where stress level and material characteristics are considered. From the literature, contradictory results on aggregate size with fracture parameters are reported. An attempt is made in this study, to understand the influence of nominal maximum aggregate size (NMAS) on flexural fatigue of concrete specimens without a notch. The main objective is to understand the effect of concrete mixtures made with two NMAS having similar strength range on stiffness change. The results indicated that the concrete made with NMAS of 10 mm had higher the fatigue life and thus loss in stiffness is less compared to the mix with NMAS of 20 mm. The damage model is used to predict the stiffness degradation and found that the model is excellent with a very low root mean square error.
