model of the flexural behavior of RC beams subjected to localized and uniform corrosion based on the finite element method. [PERSON] et al. [7] studied the performance of corroded rebars and RC under repeated loading; they concluded that from corroded rebars' stress-strain curves, the yield strength reduced, the elongation decreased, and the features of the yield plateau changed. [PERSON] et al. [8] presented an experimental study focus on the shear behavior degradation mechanism of corroded RC beams; they found the failure of RC beams occurs in shear mode instead of bending mode as the corrosion ratio of stirrups increases. [PERSON] et al. [9] studied the deterioration performance of RC beams under the effect of an acid-salt mist and carbon-dioxide-induced steel corrosion; they claimed that the bond force between the corroded steel bar and cracked concrete decreased under the effect of an acid-salt mist. [PERSON] et al. [10] reported that the steel corrosion might cause the brittle failure of RC beams, and steel corrosion significantly reduces the ultimate loading capacity and deformation ability of RC beams. Furthermore, some scholars have considered adding fibers (including steel fibers, polypropylene fibers, etc.) into concrete in order to increase the performances of a corroded RC beam [11; 12; 13]. They claimed the flexural and shear capacity of fiber-reinforced concrete beams increased considerably. In summary, experimental and analytical methods applied by most of the literature discussed above included describing the failure mode and the types of cracks from a macroscopic point of view or describing the stress-strain curve of corroded RC beams. These methods belong to the category of mechanics and morphology, which cannot determine the crack propagation stage inside the RC structures; and, to date, these methods are not novel enough. Little research has been conducted to evaluate the effect of steel corrosion on flexural behaviors of a corroded RC beam on a microscopic cracking level. Nowadays, acoustic emission (AE) technology, as a non-destructive test method, is developing rapidly. AE represents the released strain energy caused by the formation of cracks or internal friction, and it is a passive phenomenon associated with a damaging process [14; 15]. Therefore, AE shows an effective way for scholars to study the failure process of concrete materials. Based on AE theory, [PERSON] et al. [16] quantitatively evaluated the damage in concrete piers, and they concluded that AE behavior of the concrete under compression is dependent on the degree of damage. [PERSON] and [PERSON] [17] analyzed the relationship between the AE energy and concrete cracking energy of concrete, and they claimed both the AE and concrete cracking energy is increased with the increase of the concrete dimensions. [PERSON] et al. [18] claimed that the sharply increased accumulated AE energy and the ringing counts could qualitatively predict the damage to the concrete. [PERSON] et al. [19] analyzed the AE behaviors of steel-fiber-reinforced concrete by the four-point bending test; and they describe the fracture process and fracture mode by the parameters with respect to AE events, including the average frequency and total events number and so on. [PERSON] et al. [20] evaluated the fracture behavior of synthetic-fiber-reinforced concrete, steel-fiber-reinforced concrete, and hybrid-fiber-reinforced concrete under flexural loading utilizing the AE technique; and the AE parameters, such as hits and AE energy, were presented for illustrating the role of different fiber dosages on the fracture response. Furthermore, AE technology can also be applied to model the relationship between the damage and AE parameters by analyzing the AE characteristics caused by the mutual friction between rebar and concrete [21]. In summary, AE parameters can reflect the characteristics of concrete at different loading [22]; and there is a strong correlation between concrete AE activity and internal defect of concrete [23; 24].