Long-term reinforcement corrosion in low carbon concrete with a high volume of SCMs exposed to NaCl solutions and field marine environment

•At a high w/b ratio of 0.6, the accelerated corrosion test provided inconsistent ranking for the corrosion resistance of binders when continuous and intermittent impressed voltage were applied.•At a w/b ratio of 0.4, the electrochemical measurements from both accelerated corrosion and laboratory-simulated tidal exposure confirmed the advantage of 30 % FA blended cement concrete in protecting reinforcement, whereas results from two exposure conditions denoted opposite ranking for the corrosion resistance of GP cement and 50 % slag blended cement concrete.•The statistical analysis of the 674 independent data points (Ecorr, Rp) suggested that using −465 mVSCE as the upper limit for indicating a higher than 90 % corrosion probability was more reliable than the −350 mVSCE from ASTM C876.•Compared to field marine tidal exposure, long-term wet/dry cycles in 3 % NaCl induced faster corrosion initiation and propagation, thereby higher weight loss of reinforcement.•The chloride contents permitting corrosion initiation were higher for concrete with more binder due to a higher alkalinity.