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This paper presents the results of long term experiments with reinforced concrete blocks with controlledwidthcracks placed along a central reinforcing steel bar. Ponding allows for cyclic or continuous exposureto a 5% NaCl solution to imitate a marine environment. Crack widths ranging from 0.25 mm to 1 mm (0.01- 0.04 inch) and polarization levels ranging from -430 mV to -640 mV vs the Saturated Calomel Electrode(SCE) are used. Results suggest that cathodic protection with moderate polarization levels may be oflimited benefit in the presence of cracks aligned lengthwise to the rebar independent of crack width.Specimens without protection experience corrosion after only a week of exposure. The 5.5year-long testsrevealed that current densities in the order of 8 - 19 mA/m2 were required to achieve cathodic protection.Selected specimens were autopsied to examine their condition, revealing the presence of corrosion inthe central bar at the crack location. The results are evaluated as to implications on the practicalapplicability of cathodic protection to marine structures.
This work seeks to determine the performance of cathodic prevention (CPrev) and cathodic protection (CP) systems applied to cracked concrete in a simulated marine environment.
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