Early Monitoring of Rebar Corrosion Evolution Based on FBG Sensor

Cracks of structural members caused by rebar corrosion directly influence the service life of reinforced concrete structures. Therefore, it is important to monitor early corrosion evolution of the rebar and take the early steps to overcome the situation. In this paper, the response relationship between wavelength variation of Fiber Bragg grating (FBG) sensor and mass loss rate of the rebar is derived. The accuracy of the proposed theoretical model is verified by the electricity accelerated rebar corrosion experiment. It indicates that the theoretical model matches well with the tested value. Moreover, in this study, real-time online early monitoring of rebar corrosion evolution is built.