On-site transient analysis for the corrosion assessment of reinforced concrete

► On-site transient analysis of concrete structures for corrosion assessment. ► ICCP system turned off to investigate its long-term secondary protective effects. ► The complex analysis can be simplified and undertaken with common spreadsheet packages. ► Passive steel shows a long potential decay back to its rest potential after a short perturbation. ► Transient analysis may provide more accurate information than polarisation resistance.