| Summary: | This research focuses on an experimental investigation to identify the effects of fly ash on the electrochemical process of concrete
during the curing time. A rebar was analysed using potentiostat to measure the rest potential, polarization diagram, and corrosion
rate. Water-to-cement ratio and amount of fly ash were varied. After being cured for 24 hours at a temperature of 65∘
C, the samples
were immersed in 3.5% of NaCl solution for 365 days for electrochemical measurement. Measurements of the half-cell potential
and corrosion current density indicated that the fly ash has significant effects on corrosion behaviour of concrete. Although fly ash
tends to create passivity on anodic current, it increases corrosion rate. The corrosion potential of this concrete mixture decreases
compared to concrete without fly ash. From the result, it can be summarized that concrete mixture with 70% of OPC (Ordinary
Portland Cement) and 30% fly ash has shown the best corrosion resistance.
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