Critical chloride content in reinforced concrete - State of the art

In the present work, a large number of publications in connection with critical chloride content in reinforced concrete has been evaluated. The reported results scatter over more than two orders of magnitude when expressed as total chloride content by cement weight and over three orders of magnitude when expressed as Cl � /OH � ratio. This large scatter is partly the result of different definitions and experimental techniques, but also due to many factors affecting critical chloride content. Dominating influences have been identified as fol- lows: 1) The steel-concrete interface, 2) the pH value of the pore solution and 3) the electrochemical potential of the steel. Experimental investigation of the issue of critical chloride content is possible in a wide variety of procedures. At present, there exists no generally accepted or standardized procedure for the determination of the critical chloride content.

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