Design Equation for Chloride-induced Corrosion Initiation

Design Equation for Chloride-induced Corrosion Initiation 

Corrosion is thought to be initiated when the chloride content around the reinforcement exceeds a critical threshold value. This will generally be defined as a serviceability limit state (SLS), because the serviceability of the structure is compromised when repair is needed at relatively short notice. Assuming that the initial chloride content of the concrete is zero, the design equation for this SLS is given by  

In this equation, g = 0 denotes the point in time of corrosion initiation and  

J (t) = design value of the chloride-penetration resistance at any point in time (y/mm t = time (y), 

The design value of the critical chloride content can be found by 

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