Corrosion of steel bars in cracked concrete made with ordinary Portland, Slag and Fly Ash Cements

Tarek Uddin Mohammed, Toru Yamaji, Toshiyuki Aoyama, Hidenori Hamada

Research output: Chapter in Book/Report/Conference proceedingConference contribution

16 Citations (Scopus)

Abstract

Corrosion of steel bars in pre-cracked prism specimens exposed in marine environment for 15-year is presented here. The size of the specimens was 100×100×600 mm. The specimens were made with ordinary portland, slag (Type A, B and C) and fly ash (Type B) cements. A round steel bar of diameter 9 mm was embedded in each specimen. W/C were 0.45 and 0.55. Crack widths were varied from 0.1 to 5 mm. Chloride-ion concentrations in concrete and corrosion of steel bars were evaluated. Narrower cracks ( ≤ 0.5 mm) heal irrespective of the cement types. Chloride ingress and corrosion of steel bars in concrete are highest for the specimens made with ordinary portland cement and lowest for the specimens made with slag cement of Type C. Locations of the maximum corroded area as well as the deepest corrosion pit are not necessarily at or near the cracked region Wider cracks are not healed and maximum corroded area and deepest corrosion pit are observed at the cracked region. The presence of voids at the steelconcrete interface results in corrosion pits even for chloride-ion concentration less than 0.4% of cement by weight.

Original languageEnglish
Title of host publication7th CANMET/ACI International Conference on Fly Ash, Silica Fume, Slag and Natural Pozzolans in Concrete
PublisherAmerican Concrete Institute
Pages699-718
Number of pages20
ISBN (Electronic)9780870310263
Publication statusPublished - Jun 1 2001
Externally publishedYes
Event7th CANMET/ACI International Conference on Fly Ash, Silica Fume, Slag, and Natural Pozzolans in Concrete - Chennai, India
Duration: Jul 22 2001Jul 27 2001

Publication series

NameAmerican Concrete Institute, ACI Special Publication
VolumeSP-199
ISSN (Print)0193-2527

Conference

Conference7th CANMET/ACI International Conference on Fly Ash, Silica Fume, Slag, and Natural Pozzolans in Concrete
Country/TerritoryIndia
CityChennai
Period7/22/017/27/01

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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