“Temporary” Cathodic Prevention for the Durability and Sustainability of Reinforced Concrete Subjected to Carbonation

This study examines the efficacy of galvanic cathodic prevention (GCP) with zinc sacrificial anodes, applied to reinforced concrete specimens made with low-environmental-impact cements and subjected to accelerated carbonation. Specifically, it focuses on the protective effect provided by an initial polarization phase, which proved effective in reducing corrosion even after removal of the anodes from the reinforcement. The polarization memory phenomenon was highlighted through measurements of electrochemical potential and corrosion rate, comparing polarized reinforcements with control specimens. The findings could be particularly relevant for concretes made with low-clinker cements, which are more vulnerable to carbonation due to their reduced alkaline reserve. Temporary application of GCP in the early stages of service life could be an effective strategy to enhance durability without increasing maintenance and monitoring costs.