Influence of calcium ion in concrete pore solution on the passivation of galvanized steel bars

Haibing Zheng; Jianguo Dai; Chi Sun Poon; Weihua Li

doi:10.1016/j.cemconres.2018.03.001

Influence of calcium ion in concrete pore solution on the passivation of galvanized steel bars

Haibing Zheng, Jianguo Dai, Chi Sun Poon, Weihua Li

Research output: Journal article publication › Journal article › Academic research › peer-review

75 Citations (Scopus)

Abstract

The addition of supplementary cementitious materials may affect the Ca ²⁺ concentration and pH value of the concrete pore solutions. This work studied the influence of the calcium ion on the passivation of the galvanized steel bars in simulated concrete pore solutions with relatively low pH value of 12.5 and 13.15. The results showed that continuous protective layers were formed on the galvanized coating in the solutions with saturated Ca(OH) ₂ at pH 12.5 and solutions with either KOH or NaOH at pH 13.15. The passive film formed in the saturated Ca(OH) ₂ solution showed better protective properties than those in other solutions. In the solutions with lower concentrations of Ca ²⁺ at pH 12.5, there was no obvious reaction and no protective layer was formed on the surface.

Original language	English
Pages (from-to)	46-58
Number of pages	13
Journal	Cement and Concrete Research
Volume	108
DOIs	https://doi.org/10.1016/j.cemconres.2018.03.001
Publication status	Published - 1 Jun 2018

Keywords

Concrete pore solution
Corrosion
Galvanized steel
Passivation
Protective property

ASJC Scopus subject areas

Building and Construction
General Materials Science

More information

10.1016/j.cemconres.2018.03.001

Cite this

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title = "Influence of calcium ion in concrete pore solution on the passivation of galvanized steel bars",

abstract = "The addition of supplementary cementitious materials may affect the Ca 2+ concentration and pH value of the concrete pore solutions. This work studied the influence of the calcium ion on the passivation of the galvanized steel bars in simulated concrete pore solutions with relatively low pH value of 12.5 and 13.15. The results showed that continuous protective layers were formed on the galvanized coating in the solutions with saturated Ca(OH) 2 at pH 12.5 and solutions with either KOH or NaOH at pH 13.15. The passive film formed in the saturated Ca(OH) 2 solution showed better protective properties than those in other solutions. In the solutions with lower concentrations of Ca 2+ at pH 12.5, there was no obvious reaction and no protective layer was formed on the surface. ",

keywords = "Concrete pore solution, Corrosion, Galvanized steel, Passivation, Protective property",

author = "Haibing Zheng and Jianguo Dai and Poon, {Chi Sun} and Weihua Li",

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journal = "Cement and Concrete Research",

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TY - JOUR

T1 - Influence of calcium ion in concrete pore solution on the passivation of galvanized steel bars

AU - Zheng, Haibing

AU - Dai, Jianguo

AU - Poon, Chi Sun

AU - Li, Weihua

PY - 2018/6/1

Y1 - 2018/6/1

N2 - The addition of supplementary cementitious materials may affect the Ca 2+ concentration and pH value of the concrete pore solutions. This work studied the influence of the calcium ion on the passivation of the galvanized steel bars in simulated concrete pore solutions with relatively low pH value of 12.5 and 13.15. The results showed that continuous protective layers were formed on the galvanized coating in the solutions with saturated Ca(OH) 2 at pH 12.5 and solutions with either KOH or NaOH at pH 13.15. The passive film formed in the saturated Ca(OH) 2 solution showed better protective properties than those in other solutions. In the solutions with lower concentrations of Ca 2+ at pH 12.5, there was no obvious reaction and no protective layer was formed on the surface.

AB - The addition of supplementary cementitious materials may affect the Ca 2+ concentration and pH value of the concrete pore solutions. This work studied the influence of the calcium ion on the passivation of the galvanized steel bars in simulated concrete pore solutions with relatively low pH value of 12.5 and 13.15. The results showed that continuous protective layers were formed on the galvanized coating in the solutions with saturated Ca(OH) 2 at pH 12.5 and solutions with either KOH or NaOH at pH 13.15. The passive film formed in the saturated Ca(OH) 2 solution showed better protective properties than those in other solutions. In the solutions with lower concentrations of Ca 2+ at pH 12.5, there was no obvious reaction and no protective layer was formed on the surface.

KW - Concrete pore solution

KW - Corrosion

KW - Galvanized steel

KW - Passivation

KW - Protective property

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U2 - 10.1016/j.cemconres.2018.03.001

DO - 10.1016/j.cemconres.2018.03.001

M3 - Journal article

SN - 0008-8846

VL - 108

SP - 46

EP - 58

JO - Cement and Concrete Research

JF - Cement and Concrete Research

ER -

Influence of calcium ion in concrete pore solution on the passivation of galvanized steel bars

Abstract

Keywords

ASJC Scopus subject areas

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