Chloride-induced corrosion of reinforcing steel in concrete: Electrochemical modeling of initial and limiting corrosion rates

Goli Nossoni, Ronald S. Harichandran, Scott Calabrese-Barton

Research output: Contribution to journalArticle

Abstract

The high alkalinity of concrete can prevent reinforcing steel in concrete from corroding. However, corrosion will commence when the [Cl -]/[OH-] ratio reaches a threshold of about 0.6. The aim of this paper is to evaluate the initial corrosion rate of steel due to chloride penetration into the concrete pores. The corrosion process is very complex and modeling is often based on observation or speculation rather than detailed modeling of the chemical processes involved. Corrosion starts with an initial rate of corrosion when the chloride concentration reaches a threshold value. This initial corrosion rate is modeled using experimental test data. Comprehensive experimental tests were conducted to understand the behavior of steel in alkaline media in the presence of chloride ions and how much this behavior changes as the chloride concentration increases. Understanding this behavior enables modeling of the initial corrosion rate of steel inside concrete which is highly dependent on the chloride concentration. Corrosion cannot continue at this rate for a long period and will eventually slow down to the limiting current rate that depends on the concentration of oxygen inside concrete at the location of the steel bar. The limiting corrosion current that mostly governs the corrosion rate during the corrosion period is highly dependent on the initial corrosion rate, and it is therefore important to accurately estimate the initial corrosion rate.

LanguageEnglish (US)
JournalNACE - International Corrosion Conference Series
StatePublished - 2011

Profile

Steel
Corrosion rate
Chlorides
Concretes
Corrosion
Alkalinity
Ions
Oxygen

Keywords

  • Chloride
  • Concrete
  • Initial corrosion rate
  • Limiting corrosion rate
  • Polarization curve
  • Steel

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)
  • Materials Science(all)

Cite this

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title = "Chloride-induced corrosion of reinforcing steel in concrete: Electrochemical modeling of initial and limiting corrosion rates",
abstract = "The high alkalinity of concrete can prevent reinforcing steel in concrete from corroding. However, corrosion will commence when the [Cl -]/[OH-] ratio reaches a threshold of about 0.6. The aim of this paper is to evaluate the initial corrosion rate of steel due to chloride penetration into the concrete pores. The corrosion process is very complex and modeling is often based on observation or speculation rather than detailed modeling of the chemical processes involved. Corrosion starts with an initial rate of corrosion when the chloride concentration reaches a threshold value. This initial corrosion rate is modeled using experimental test data. Comprehensive experimental tests were conducted to understand the behavior of steel in alkaline media in the presence of chloride ions and how much this behavior changes as the chloride concentration increases. Understanding this behavior enables modeling of the initial corrosion rate of steel inside concrete which is highly dependent on the chloride concentration. Corrosion cannot continue at this rate for a long period and will eventually slow down to the limiting current rate that depends on the concentration of oxygen inside concrete at the location of the steel bar. The limiting corrosion current that mostly governs the corrosion rate during the corrosion period is highly dependent on the initial corrosion rate, and it is therefore important to accurately estimate the initial corrosion rate.",
keywords = "Chloride, Concrete, Initial corrosion rate, Limiting corrosion rate, Polarization curve, Steel",
author = "Goli Nossoni and Harichandran, {Ronald S.} and Scott Calabrese-Barton",
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AU - Harichandran,Ronald S.

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Y1 - 2011

N2 - The high alkalinity of concrete can prevent reinforcing steel in concrete from corroding. However, corrosion will commence when the [Cl -]/[OH-] ratio reaches a threshold of about 0.6. The aim of this paper is to evaluate the initial corrosion rate of steel due to chloride penetration into the concrete pores. The corrosion process is very complex and modeling is often based on observation or speculation rather than detailed modeling of the chemical processes involved. Corrosion starts with an initial rate of corrosion when the chloride concentration reaches a threshold value. This initial corrosion rate is modeled using experimental test data. Comprehensive experimental tests were conducted to understand the behavior of steel in alkaline media in the presence of chloride ions and how much this behavior changes as the chloride concentration increases. Understanding this behavior enables modeling of the initial corrosion rate of steel inside concrete which is highly dependent on the chloride concentration. Corrosion cannot continue at this rate for a long period and will eventually slow down to the limiting current rate that depends on the concentration of oxygen inside concrete at the location of the steel bar. The limiting corrosion current that mostly governs the corrosion rate during the corrosion period is highly dependent on the initial corrosion rate, and it is therefore important to accurately estimate the initial corrosion rate.

AB - The high alkalinity of concrete can prevent reinforcing steel in concrete from corroding. However, corrosion will commence when the [Cl -]/[OH-] ratio reaches a threshold of about 0.6. The aim of this paper is to evaluate the initial corrosion rate of steel due to chloride penetration into the concrete pores. The corrosion process is very complex and modeling is often based on observation or speculation rather than detailed modeling of the chemical processes involved. Corrosion starts with an initial rate of corrosion when the chloride concentration reaches a threshold value. This initial corrosion rate is modeled using experimental test data. Comprehensive experimental tests were conducted to understand the behavior of steel in alkaline media in the presence of chloride ions and how much this behavior changes as the chloride concentration increases. Understanding this behavior enables modeling of the initial corrosion rate of steel inside concrete which is highly dependent on the chloride concentration. Corrosion cannot continue at this rate for a long period and will eventually slow down to the limiting current rate that depends on the concentration of oxygen inside concrete at the location of the steel bar. The limiting corrosion current that mostly governs the corrosion rate during the corrosion period is highly dependent on the initial corrosion rate, and it is therefore important to accurately estimate the initial corrosion rate.

KW - Chloride

KW - Concrete

KW - Initial corrosion rate

KW - Limiting corrosion rate

KW - Polarization curve

KW - Steel

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