Corrosion Propagation of Steel Rebar Embedded in Marine Structures Prepared with Binary Blended Concrete Containing Slag

This research was conducted to better understand the corrosion propagation stage of steel rebar embedded in marine structures prepared with binary blended concrete exposed to high humidity environment. Specimens with binary (Slag (SL)) concrete mix (30.5 cm x 12.7 cm x 7.6 cm) were prepared. A w/cm ratio of 0.41 was used to make this concrete mixture. The specimens were reinforced with #3 rebar and have a 0.75 cm concrete cover. Different size reservoirs were installed on the top surface of the specimens. The reservoir was filled with NaCl solution (10% by weight). Electromigration, which accelerated chloride transport and lasted for a week to a few months, was used. The influence of rebar length under the reservoir for slag containing binary concrete mixes was investigated. This study describes corrosion current monitoring via linear polarization resistance and electrochemical impedance spectroscopy measurements. The solution resistance and rebar potential were monitored for over 600 days. In some instances, corrosion initiated several weeks after the electromigration was removed. Based on the results of the experiments, it was observed that the corrosion current values were considerably influenced by the length of the solution reservoirs.