Innovative corrosion mitigation solutions for existing concrete structures

Reinforced concrete has developed a strong reputation as a versatile, durable and economical building material. However, when concrete is subjected to aggressive environmental conditions, repair and maintenance is required over time to keep the structure in a serviceable and safe condition. In recent years, the range of corrosion mitigation systems provides engineers and owners with more options to mitigate corrosion and extend the service life of existing structures. Various types of electrochemical corrosion mitigation systems (including electrochemical treatments, impressed current cathodic protection, and galvanic protection) and an overview of the various levels of protection offered by electrochemical corrosion mitigation technologies (corrosion prevention, corrosion control, cathodic protection and corrosion passivation) is presented. Project reviews detail the application of certain specialised technologies including electrochemical treatments (re-alkalisation and chloride extraction), targeted corrosion control with embedded galvanic anodes, and galvanic cathodic protection using embedded strip anodes and humectant-activated zinc metalising.