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 publicationJournal articleAcademic researchpeer-review

18 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 languageEnglish
Pages (from-to)46-58
Number of pages13
JournalCement and Concrete Research
Volume108
DOIs
Publication statusPublished - 1 Jun 2018

Keywords

  • Concrete pore solution
  • Corrosion
  • Galvanized steel
  • Passivation
  • Protective property

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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