Abstract
Compared to natural sand, manufactured sand (M-Sand) has significant differences in terms of stone powder content, particle size distribution, and particle shape. The fatigue performance of M-Sand concrete structures is a crucial problem for the application of M-Sand in significant engineering structures. In this study, four different types of fine aggregates were selected to investigate the shear fatigue behavior of reinforced concrete (RC) beams by considering the influence of the maximum load level. Next, the performance indexes of the fatigue life of M-Sand concrete beams were evaluated. The results showed that the fatigue failure processes of concrete beams produced with different sand types were similar. The fatigue life of concrete beams was found to be related to the stress or load range. At the same maximum load level, the methylene blue (MB) value is a critical index that influenced the fatigue life of concrete beams containing M-Sand. Moreover, the fatigue life showed a linear logarithmic relationship with the average permanent deflection of Stage II. The total dissipation energies of the concrete beams in Stage II were different for the various fine aggregates. Generally, the higher the total dissipation energy, the longer the fatigue life of the concrete beam. The average dissipation energy in Stage II can be used as a characteristic index for evaluating the fatigue performance of concrete beams produced with different types of fine aggregates. • Shear fatigue behaviors of sixteen reinforced concrete beams containing manufactured sand were innovative analyzed. • Three different types of manufactured as well as natural sand were used in experimentally program. • The fatigue life of manufactured sand concrete beams was found to be related to the stress or load range. • The magnitude of the dissipation energy together with permanent deflection could indicate the fatigue life of concrete beams.
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