This paper presents a nondestructive test method to evaluate the residual bending strength\nof corroded reinforced concrete beam by analyzing the self-magnetic flux leakage (SMFL) signals. The\nautomatic scanning device was equipped with a micromagnetic sensor and sensor-based experimental\ndetails were introduced. Next, the theoretical formula of the normal component HS(z) of the SMFL\nsignal that originated from the corroded region was derived based on the magnetic dipole model and\nthe experimental results were discussed. The results indicate that the experimental data of HS(z) are\nconsistent with the theoretical calculations, both location and extent of the steel bars corrosion can be\nqualitatively determined by using HS(z). The gradient K of HS(z) is approximately linearly related to\nthe loss rate, S, of the bending strength, which can be used to evaluate the residual bending strength\nof the corroded reinforced concrete beam. This work lays the foundation for evaluating the residual\nbending strength of corroded reinforced concrete beams using the SMFL signal; the micromagnetic\nsensor is further applied to the civil engineering
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