Impact of crack width on bond: confined and unconfined rebar |
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| Authors: | David W Law Denglei Tang Thomas K C Molyneaux Rebecca Gravina |
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| Affiliation: | (1) School of the Built Environment, Heriot Watt University, Edinburgh, EH14 4AS, UK;(2) VicRoads, Melbourne, VIC, Australia;(3) School of Civil, Environmental and Chemical Engineering, RMIT University, Melbourne, VIC, 3000, Australia |
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| Abstract: | This paper reports the results of a research project comparing the effect of surface crack width and degree of corrosion on
the bond strength of confined and unconfined deformed 12 and 16 mm mild steel reinforcing bars. The corrosion was induced
by chloride contamination of the concrete and an applied DC current. The principal parameters investigated were confinement
of the reinforcement, the cover depth, bar diameter, degree of corrosion and the surface crack width. The results indicated
that potential relationship between the crack width and the bond strength. The results also showed an increase in bond strength
at the point where initial surface cracking was observed for bars with confining stirrups. No such increase was observed with
unconfined specimens. |
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