A set of partially immersed reinforced concrete columns with mature corrosion patterns was used to demonstrate that corrosion macrocell currents provided "cathodic prevention" to parts of the steel assembly that remained passive even though exposed to high chloride (~ 4.7% of the cement weight) concrete. Depassivation of that steel was observed upon macrocell decoupling.
Cathodic prevention was implemented with commercial Zn bulk anodes on laboratory columns simulating a reinforced concrete marine system. Two computational models of these laboratory columns were implemented. The results obtained from both models were in reasonable agreement with the experimental observations. One of the models was used to predict cathodic prevention throwing power on field scale structures, as a step towards field application. These predictions suggest that with an immersed anode useful levels of cathodic prevention may be reasonably expected, even under conservative assumptions, in the area immediately above high tide where conditions are otherwise very severe.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.