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Steel reinforcement remains passive until a certain amount of chlorides entry in contact with them. The corrosion develops in local areas and extends around depending on the level of chloride concentration. The further evolution of the corrosion depends on the total amount of chlorides although there is a maximum in the expected values of the corrosion rate. | Steel reinforcement remains passive until a certain amount of chlorides entry in contact with them. The corrosion develops in local areas and extends around depending on the level of chloride concentration. The further evolution of the corrosion depends on the total amount of chlorides although there is a maximum in the expected values of the corrosion rate. | ||
| − | In present paper results are given on several tests that have been performed to establish the corrosion rates in chloride environments of different concentrations. First, the chloride threshold for depassivation will be commented on and its dependence of the <math>Cl^-/OH^-</math> ratio as well as on the electrical potential exhibited by the reinforcement will be discussed. The depassivation occurs for <math>Cl^-</math> amounts between 0.2 and 1 % by cement weight for corrosion potentials more noble positive than <math>-200</math> mVsce. Concerning the values of the corrosion rate, they increase when increasing the chloride concentration until around 1M NaCl, but above this concentration, the corrosion rate does not increase more likely due the decreasing oxygen content in the pore solution. Certain unexpected results are presented to illustrate that the corrosion rate is the result of some counterbalance phenomena, not always taken into account. | + | In present paper results are given on several tests that have been performed to establish the corrosion rates in chloride environments of different concentrations. First, the chloride threshold for depassivation will be commented on and its dependence of the <math>Cl^-/OH^-</math> ratio as well as on the electrical potential exhibited by the reinforcement will be discussed. The depassivation occurs for <math>Cl^-</math> amounts between <math>0.2</math> and <math>1%</math> by cement weight for corrosion potentials more noble positive than <math>-200</math> mVsce. Concerning the values of the corrosion rate, they increase when increasing the chloride concentration until around 1M NaCl, but above this concentration, the corrosion rate does not increase more likely due the decreasing oxygen content in the pore solution. Certain unexpected results are presented to illustrate that the corrosion rate is the result of some counterbalance phenomena, not always taken into account. |
Latest revision as of 10:47, 4 June 2020
Abstract
Steel reinforcement remains passive until a certain amount of chlorides entry in contact with them. The corrosion develops in local areas and extends around depending on the level of chloride concentration. The further evolution of the corrosion depends on the total amount of chlorides although there is a maximum in the expected values of the corrosion rate. In present paper results are given on several tests that have been performed to establish the corrosion rates in chloride environments of different concentrations. First, the chloride threshold for depassivation will be commented on and its dependence of the Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): Cl^-/OH^-
ratio as well as on the electrical potential exhibited by the reinforcement will be discussed. The depassivation occurs for Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): Cl^-
amounts between Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): 0.2
and Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): 1%
by cement weight for corrosion potentials more noble positive than Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): -200
mVsce. Concerning the values of the corrosion rate, they increase when increasing the chloride concentration until around 1M NaCl, but above this concentration, the corrosion rate does not increase more likely due the decreasing oxygen content in the pore solution. Certain unexpected results are presented to illustrate that the corrosion rate is the result of some counterbalance phenomena, not always taken into account.
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Published on 01/01/2006
DOI: 10.1617/281214390X.001
Licence: CC BY-NC-SA license
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