Title:
Influence of Surface Crack Width on Bond Strength of Reinforced Concrete
Author(s):
Denglei Tang, Thomas K. C. Molyneaux, David W. Law, and Rebecca Gravina
Publication:
Materials Journal
Volume:
108
Issue:
1
Appears on pages(s):
29-37
Keywords:
bond; corrosion; cover; deformed reinforcing bar; surface crack width
DOI:
10.14359/51664213
Date:
1/1/2011
Abstract:
This paper reports the results of an experimental program to investigate the changes in the bond characteristics of deformed mild steel reinforcing due to chloride-induced corrosion. The principal parameters investigated are the cover depth, bar diameter, degree of corrosion, and the surface crack width. The results show a strong relationship between the average surface crack width and the average bond strength; the degree of corrosion does not demonstrate such a clear relationship. The bars with a 1 C/Φ (cover/diameter) show an initial increase in bond strength at the first visible crack; no similar initial increase is observed for the bars with 3 C/Φ. The bottom-cast bars display a higher bond strength with no corrosion, but a similar bond strength is observed for both top- and bottom-cast bars once cracking is observed.