Rebar corrosion due to chlorides in synergy with sodium, potassium, and magnesium

Krishneel K. Sharma, Ravin N. Deo, Ajal Kumar, Kabir Mamun

Research output: Contribution to journalArticleResearchpeer-review

4 Citations (Scopus)

Abstract

The ability of steel reinforced concrete to withstand long service life is ensured by the strong binding between the concrete and the rebar. Although rebar corrosion deterioration in the presence of chlorides is well known, it is important to note that these anions are never present in isolation, i.e., other cations are also present within the exposed environment. Consequently, a study was conducted to investigate the rebar deterioration due to chlorides in the presence of different cations. A well-controlled laboratory experiment for assessing the corrosivity of sodium chloride, potassium chloride and magnesium chloride was conducted. The galvanostatic pulse technique was used to investigate the concrete-steel interfacial structure, which was modelled after a modified Randles circuit. Analysis revealed influences of the associated cations during the rebar corrosion process. A normalisation approach was used to compare chloride attacks on the rebar due to different salt solutions. Results suggest that chloride attacks in the presence of sodium cations are relatively corrosive.

Original languageEnglish
Pages (from-to)533-540
Number of pages8
JournalConstruction and Building Materials
Volume165
DOIs
Publication statusPublished - 20 Mar 2018
Externally publishedYes

Keywords

  • Chlorides
  • Concrete
  • Galvanostatic pulse
  • Rebar corrosion

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