Corrosion of Steel Rebar Embedded in Ternary Blended Concrete Exposed to High Humidity Environment

20% fly ash and 50% slag (termed as T1), while the other contains cement replacement of 20% fly ash and 8% silica fume (termed as T2). Five (T1) or six (T2) single rebar specimens were prepared per concrete mix with a 0.75 cm concrete cover (0.3 in). The water to cementitious ratio of T1 and T2 concrete mixes were 0.41 and 0.37 respectively. Embedded single rebar sections had a radius of 0.47 cm. On the top surface of the specimens, different size reservoirs were attached, ranging from 5 cm to 15 cm. The reservoirs were filled with NaCl solution with 10% concentration. Corrosion initiation occurred by the application of accelerated chloride transport method, and it lasted anywhere from a week to a few months. For ternary blended concrete mixes, the influence of rebar length under the reservoir was analyzed. Subsequently, the electrochemical behavior of the specimens was assessed using electrochemical impedance spectroscopy and linear polarization resistance techniques. The corrosion related parameters such as rebar potential, solution resistance and corrosion current were monitored for around 500 days. Based on the experimental findings, it was observed that the corrosion current values for T1 concrete mixes were found to be larger than those of corrosion current values for T2 concrete mixes.