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 I: Black bars
A protocol is described whereby time-to-corrosion, T, of reinforcing steel in concrete exposed to chlorides is calculated as a distributed rather than discrete, parameter. The method consists of inputting distribution functions for 1) surface Cl(-) concentrafion (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 active corrosion (C[ind T]) into a governing, first principles equation from which the fraction of identically exposed electrochemically independent elements that has initialed corrosion is calculated at a specific time. By doing this for multiple times, a cumulative distribution function (CDF) plot of T, is developed, Example analyses were performed tesed upon either literature or assumed distributed Cs, D, x and CT data. The resorts indicate that reinforced concrete durability should be characterized not simply in terms of the time at which reinforcement corrosion occurs initially as is normally the case, but also by the rate at which active corrosion subsequently commences for the remaining passive elements. Further, an important but often overlooked aspect of how Cs determined or chosen for diffusion analyses in concrete is emphasized. Advantageous attributes of this methodology in which influential variables are distributed are discussed and comparisons made to the more traditional discrete parameter approach.
Corrosion initiation projection for reinforced concrete exposed to chlorides. Part I: Black bars
A protocol is described whereby time-to-corrosion, T, of reinforcing steel in concrete exposed to chlorides is calculated as a distributed rather than discrete, parameter. The method consists of inputting distribution functions for 1) surface Cl(-) concentrafion (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 active corrosion (C[ind T]) into a governing, first principles equation from which the fraction of identically exposed electrochemically independent elements that has initialed corrosion is calculated at a specific time. By doing this for multiple times, a cumulative distribution function (CDF) plot of T, is developed, Example analyses were performed tesed upon either literature or assumed distributed Cs, D, x and CT data. The resorts indicate that reinforced concrete durability should be characterized not simply in terms of the time at which reinforcement corrosion occurs initially as is normally the case, but also by the rate at which active corrosion subsequently commences for the remaining passive elements. Further, an important but often overlooked aspect of how Cs determined or chosen for diffusion analyses in concrete is emphasized. Advantageous attributes of this methodology in which influential variables are distributed are discussed and comparisons made to the more traditional discrete parameter approach.
Corrosion initiation projection for reinforced concrete exposed to chlorides. Part I: Black bars
Abbildung der Korrosionseinleitung für chloridausgesetzten Stahlbeton. Teil I: Armierungsstäbe aus unlegiertem Stahl
Hartt, William H. (author)
2011
18 Seiten, 11 Bilder, 12 Tabellen, 22 Quellen
Conference paper
English
Corrosion Initiation Projection for Reinforced Concrete Exposed to Chlorides: Part 1-Black Bars
| British Library Online Contents | 2011
| British Library Online Contents | 2011