RESEARCH ON [Cl<sup>-</sup>]/[OH<sup>-</sup>] THRESHOLD VALUES TO DEPASSIVATE REINFORCING BARS EMBEDDED IN CHLORIDE CONTAMINATED CONCRETE AND CARBONATION SERVICE LIFE PREDICATION

Liu Zhiyong; Lv Yonggao; Zhou Xingang; Sunwei

doi:10.13204/j.gyjz200510016

Volume 35 Issue 10

Dec. 2014

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Liu Zhiyong, Lv Yonggao, Zhou Xingang, Sunwei. RESEARCH ON [Cl-]/[OH-] THRESHOLD VALUES TO DEPASSIVATE REINFORCING BARS EMBEDDED IN CHLORIDE CONTAMINATED CONCRETE AND CARBONATION SERVICE LIFE PREDICATION[J]. INDUSTRIAL CONSTRUCTION, 2005, 35(10): 50-53. doi: 10.13204/j.gyjz200510016

Citation:

Liu Zhiyong, Lv Yonggao, Zhou Xingang, Sunwei. RESEARCH ON [Cl^-]/[OH^-] THRESHOLD VALUES TO DEPASSIVATE REINFORCING BARS EMBEDDED IN CHLORIDE CONTAMINATED CONCRETE AND CARBONATION SERVICE LIFE PREDICATION[J]. INDUSTRIAL CONSTRUCTION, 2005, 35(10): 50-53. doi: 10.13204/j.gyjz200510016

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RESEARCH ON [Cl^-]/[OH^-] THRESHOLD VALUES TO DEPASSIVATE REINFORCING BARS EMBEDDED IN CHLORIDE CONTAMINATED CONCRETE AND CARBONATION SERVICE LIFE PREDICATION

doi: 10.13204/j.gyjz200510016

1.
1. Yantai University Yantai 264005;
2.
2. Southeast University Nanjing 210096

Received Date: 2004-03-28
Publish Date: 2005-10-20

Abstract

Abstract

Making concrete pore solution by dissolving concrete powder around reinforcing steel bars in water of 10 times weight of concrete,research on [Cl~-]/[OH~-]threshold values to depassivate reinforcing bars embedded in chloride contaminated concrete in carbonation process through testing half-cell potential of steel bars has been done.Mathematic model between half-cell potential of steel bars embedded in chloride contaminated concrete and [Cl~-]/[OH~-] values has been established,and the [Cl~-]/[OH~-] threshold values to depassivate reinforcing bars embedded in ordinary portland cement(OPC) concrete and in OPC concrete with 50% FA+SG as well as in sulphoaluminate cement concrete are 0.386,0.348 and 0.138 respectively,which are lower than 0.60 threshold value developed by active corrosion of the reinforcing steel in simulating concrete pore solution before by others.The [Cl~-]/[OH~-] vs time power function model in carbonation process service life prediction of chloride contaminated concrete has been used.Test results show that the service life of chloride contaminated concrete is lower than that of control concrete,and the sevice life of chloride contaminated OPC concrete with 50% FA+SG is lower than that of OPC concrete.Research results are significant to service life prediction and durability design of chloride contaminated concrete in atmospheric environment.
- chloride contaminated concrete,
- carbonation,
- service life prediction,
- [Cl-]/[OH-] threshold values to depassivate steel bars

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References(11)

References

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