Abstract
Abstract A protocol is described whereby time-to-corrosion, Ti, of reinforcing steel in concrete exposed to chlorides was calculated as a distributed, rather than discrete, parameter. The method consists of inputting (1) an average value for surface [Cl−] and the effective diffusion coefficient, (2) the mean and standard deviation of concrete cover over the reinforcement, and (3) a distribution function for the critical Cl− threshold concentration to initiate corrosion, CT, based upon values previously reported. The calculation result is a cumulative distribution function (CDF) plot of Ti. Example analyses were performed based upon a range of design and material property values of the above parameters for both past and representative, present-day bridge decks and marine bridge substructures. Results for corrosion-resistant reinforcement are compared with those for black bar. It is proposed that reinforced concrete durability should be characterized not simply in terms of the time at which corrosion initia...
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