Enhanced passivation of galvanized steel bars in nano-silica modified cement mortars

Haibing Zheng, Jian Guo Dai, Lei Hou, Guozhe Meng, Chi Sun Poon, Weihua Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

This work investigated the electrochemical behavior of galvanized steel bars in nano-silica modified cement mortars. The internal environmental factors of the mortar were firstly characterized. Then the passivation process of the galvanized steel bars was monitored. The results showed that the presence of nano-silica influenced the passivation process of galvanized steel bars and improved the protective properties of passive film. The morphology of passive film was changed, and the thickness was increased by the addition of nano-silica. The CHZ layer performed as a bonding agent between the galvanized steel and mortar matrix. The addition of nano-silica promoted the formation of gaps at the rebar/mortar interface, and there was no evidence for the presence of a lime-rich layer at the interface.

Original languageEnglish
Article number103626
JournalCement and Concrete Composites
Volume111
DOIs
Publication statusPublished - Aug 2020

Keywords

  • Concrete
  • Corrosion
  • Galvanized steel bars
  • Nano-silica
  • Passivation

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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