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Cathodic Prevention/Protection Of Marine Corrosion Of Steel In Previously Cracked Concrete

Picture for Cathodic Prevention/Protection Of Marine Corrosion Of Steel In Previously Cracked Concrete
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Product Number: 51321-16952-SG
Author: M. Dugarte; A.A. Sagüés
Publication Date: 2021
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This paper presents the results of long term experiments with reinforced concrete blocks with controlledwidth
cracks placed along a central reinforcing steel bar. Ponding allows for cyclic or continuous exposure
to 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 of
limited 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 tests
revealed 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 in
the central bar at the crack location. The results are evaluated as to implications on the practical
applicability of cathodic protection to marine structures.

This paper presents the results of long term experiments with reinforced concrete blocks with controlledwidth
cracks placed along a central reinforcing steel bar. Ponding allows for cyclic or continuous exposure
to 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 of
limited 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 tests
revealed 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 in
the central bar at the crack location. The results are evaluated as to implications on the practical
applicability of cathodic protection to marine structures.

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