A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Corrosion initiation projection for reinforced concrete exposed to chlorides. Part II: Corrosion resistant bars
A companion paper (Part I) 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 1) surface Cl(-) concentration (C[ind s]), 2) the effective diffusion coefficient (D), 3) concrete cover over the reinforcement (x), and 4) the critical Cl(-) concentration threshold to initiate corrosion (C[ind T]) 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 I paper, the protocol was applied to black bar (BB) reinforcement; however, with advent of life-cycle cost considerations and specified bridge design lives of 75-100 years, increased attention has focused during the past one-to-two decades upon corrosion resistant reinforcements (CRR) as an alternative to black and epoxy-coated bars. The present study employed this same governing equation to determine CDF(T[ind i]) trends for selected CRR and project the CDF(T[ind i]) increase that is realized with these CRR compared to BB.
Corrosion initiation projection for reinforced concrete exposed to chlorides. Part II: Corrosion resistant bars
A companion paper (Part I) 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 1) surface Cl(-) concentration (C[ind s]), 2) the effective diffusion coefficient (D), 3) concrete cover over the reinforcement (x), and 4) the critical Cl(-) concentration threshold to initiate corrosion (C[ind T]) 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 I paper, the protocol was applied to black bar (BB) reinforcement; however, with advent of life-cycle cost considerations and specified bridge design lives of 75-100 years, increased attention has focused during the past one-to-two decades upon corrosion resistant reinforcements (CRR) as an alternative to black and epoxy-coated bars. The present study employed this same governing equation to determine CDF(T[ind i]) trends for selected CRR and project the CDF(T[ind i]) increase that is realized with these CRR compared to BB.
Corrosion initiation projection for reinforced concrete exposed to chlorides. Part II: Corrosion resistant bars
Abbildung der Korrosionseinleitung für chloridausgesetzten Stahlbeton. Teil II: Korrosionsbeständige Armierungsstäbe
Hartt, William H. (author)
2011
11 Seiten, 8 Bilder, 5 Tabellen, 14 Quellen
Conference paper
English
| British Library Online Contents | 2011
Corrosion Initiation Projection for Reinforced Concrete Exposed to Chlorides: Part 1-Black Bars
| British Library Online Contents | 2011