土木工程外文文献及翻译本科毕业论文设计.docVIP

外文文献： Materials and Structures ??RILEM?2010 10.1617/s11527-010-9700-y Original Article Impact of crack width on bond: confined and unconfined rebar David?W.?Law1?, Denglei?Tang2, Thomas?K.?C.?Molyneaux3 and Rebecca?Gravina3 (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 David?W.?LawEmail: D.W.Law@hw.ac.uk Received: 14?January?2010??Accepted: 14?December?2010??Published online: 23?December?2010 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. Keywords:??bond?;corrosion?;?rebar?;?cover?;?crack width?;?concrete 1 ? Introduction The corrosion of steel reinforcement is a major cause of the deterioration of reinforced concrete structures throughout the world. In uncorroded structures the bond between the steel reinforcement and the concrete ensures that reinforced concrete acts in a composite manner. However, when corrosion of the steel occurs this composite performance is adversely affected. This is due to the formation of corrosion products on the steel surface, which affect the bond between the steel and the concrete. The deterioration of