Rebar Corrosion Monitoring with a Multisensor Non-Destructive Geophysical Techniques

This paper introduces a laboratory test, that was performed at Geophysical Laboratory of Ferrara University. The test consisted in a multisensor geophysical application concerning rebar corrosion monitoring. A concrete sample of about 500mm x 300mm with one steel rebar of 10 mm diameter and 40cm long was used. The experiment defined an accelerating rebar corrosion with direct current (DC) power supply along the rebar and a partial immersion of the sample in a 5% sodium chloride (N aCl) solution inducing the corrosion phenomena. The GPR with 2GHz antenna and Self-Potential acquisition were used for rebar corrosion monitoring. Each technique provided specific information, but a data integration method used in the operating system will further improve the overall quality of diagnosis. The collected data were used for an integrated detection approach useful to observe the corrosion evolution along the reinforcement bar. The obtained laboratorial results show the good performance of the used approach and define the first setting consideration for the real case application.