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Study of Galvanic Potential of Zinc and Steel to Elucidate Open Circuit Potential Values of Galvanized Steel Rebar in Concrete Structures

The measurement of the open circuit potential of the reinforcement is used to identify regions in concrete structures with active process of corrosion. For black steel rebars ASTM C876: 2015 provides the correlation between the numerical value of the potentials measured and the steel rebar condition defining a range with a greater than 90 % probability of occurrence of corrosion or a greater than 90 % probability of not being corroded and between these an corrosion condition uncertain. However the values of potential established for black steel rebar are not applicable to reinforced concrete structure composed of galvanized steel rebars because the zinc and the steel are a galvanic couple and the value of the open circuit potential is a function of the exposed area ratio of the zinc by area of the steel. In order to verify and elaborate a classification similar to that of the black steel rebar for galvanized steel rebar the open circuit potential of galvanic couple of zinc/steel was measured considering various area ratios in simulated pore solutions with and without chloride ion contamination. The obtained potentials were compared to the steel rebar potentials embedded in concrete.

Product Number: 51319-13336-SG
Author: Zehbour Panossian
Publication Date: 2019
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