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The concrete cover-zone is a major factor governing the degradation of concrete structures as it provides the only barrier to aggressive agents which initiate corrosion of the reinforcement. Knowledge of the protective qualities of cover-zone concrete is critical in attempting to make predictions as to the in-service performance of the structure with regard to likely deterioration rates for a particular exposure condition and compliance with specified design life. To this end, a multi-electrode array was used to study the surface 50mm of concrete specimens thereby allowing a detailed picture of the response of the covercrete to the changing environment. In the current work, CEM I, CEM II/B-V and CEM III/A cements were used and comprised field studies representing a range of exposure conditions.
Holmes, N., McCarter, J., Chrisp, M., Starrs, G., Nanukuttan, S., Basheer, L., Basheer, M.: Performance Monitoring of Cover-Zone Concrete. Proceedings of Concrete in Aggressive Aqueous Environments, Vol.2, pp.523-531. Toulouse, France, June 3-4th, 2009.