Abstract
Abstract A companion paper (Part 1) introduced a protocol whereby time-to-corrosion, Ti, of reinforcing steel in concrete exposed to chlorides is calculated as a distributed, rather than discrete, parameter. The method consists of, first, considering that identically exposed, electrochemically independent elements comprise the concrete of interest and, second, inputting distribution functions for surface Cl− concentration (Cs), the effective diffusion coefficient (D), concrete cover over the reinforcement (x), and the critical Cl− concentration threshold to initiate corrosion (CT) into a governing equation from which the fraction of elements that have initiated corrosion is calculated for a specific exposure time. Upon repeating the calculation for different times, a cumulative distribution function (CDF) plot of Ti is constructed. In the Part 1 paper, the protocol was applied to black bar (BB) reinforcement; however, with advent of life-cycle cost considerations and specified bridge design lives of 75 ye...
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