Corrosion of steel bars with respect to orientation in concrete

Citation
Tu. Mohammed et al., Corrosion of steel bars with respect to orientation in concrete, ACI MATER J, 96(2), 1999, pp. 154-159
Citations number
8
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Material Science & Engineering
Journal title
ACI MATERIALS JOURNAL
ISSN journal
0889-325X → ACNP
Volume
96
Issue
2
Year of publication
1999
Pages
154 - 159
Database
ISI
SICI code
0889-325X(199903/04)96:2<154:COSBWR>2.0.ZU;2-J
Abstract
Corrosion of steel bars (main steel and stirrup) with respect to the orient ation in concrete is presented. A detailed study on macrocell and microcell corrosion of steel bars in concrete was conducted on horizontal and vertic al steels, depending on the casting direction. The horizontal steel was div ided into top and bottom halves. The study was conducted with chloride ions in concrete Water-cement ratios (w/c) were 0.5 and 0.7. The electrochemica l investigations, microscopic and physical observations of steel bars were performed. The laboratory investigations were verified with the long-term ( 23 year) exposure investigations on reinforced concrete beams. The study al so focused on the influence of stirrup on macrocell formation of main steel , and corrosion of plain and deformed steel bars. The study concludes that orientation of steel bars has a significant influe nce on macrocell and microcell corrosion of steel bars in concrete. Formati on of gaps under the horizontal steel's cause significant corrosion. Stirru ps play an important role in increasing macrocell corrosion of main steel. The deformed bar corroded more than fire plain bar.