08302 Arresting and Preventing Corrosion of Steel in Concrete

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Product Number: 51300-08302-SG

ISBN: 08302 2008 CP

Author: Nigel Davison, Adrian Roberts, and Gareth K. Glass

Publication Date: 2008

Industry: Highways & Bridges

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Corrosion of steel reinforcement is a major factor affecting the durability of reinforced concrete structures. To address this problem an improved electrochemical treatment consisting of two phases has been developed. Firstly a high current is briefly driven to the steel to arrest corrosion. In the process corroding sites are moved from the steel to an installed anode system. This first phase lasts about 1 week. Galvanic protection is then provided. This is low maintenance and requires no user intervention to function. A single anode system consisting of a hybrid of impressed current and sacrificial technologies is installed to deliver the protection current in both phases. The anode system will typically contain enough charge to provide galvanic protection current for 50 years. This depends on the aggressive nature of the environment. The two phase treatment has now been applied to more than 10 structures around the world including bridges, car parks, marine structures and buildings and the first laboratory trial in heavily chloride contaminated concrete continues to deliver outstanding performance. Monitoring has been tailored to meet end user requirements and in every case tested steel passivity has been achieved.