Chemical treatment of corroding steel reinforcement after removal of chloride-contaminated concrete

W. D. Collins, R. E. Weyers, I. L. Al-Qadi

Research output: Contribution to specialist publicationArticle

Abstract

The increasing use of deicing salts on bridge decks has accelerated their deterioration due to chloride-induced corrosion of steel reinforcement, which causes cracking and spalling. One method being considered as a possible corrosion abatement measure is the removal of chloride-contaminated concrete followed by chemical treatment of the partially exposed rebar through ponding and/or placement of chemically treated mortar. Several commercial and experimental corrosion inhibitors were evaluated in order to determined the most effective corrosion treatment when applied in conjunction with removal of chloride-contaminated concrete. The performances of the inhibitors were evaluated in an accelerated test program. Based on post-treatment electrochemical measurements, calcium-nitrite-based corrosion inhibitor was most effective when applied as a ponding and when placed in backfilled mortar. Several other inhibitors were also sufficiently effective and were recommended for further evaluation in large-scale and field experimentation. On the other hand, several inhibitors affected the hydration process of portland cement.

Original languageEnglish (US)
Pages74-88
Number of pages15
Volume49
No1
Specialist publicationCorrosion
DOIs
StatePublished - 1993
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • General Materials Science

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