EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES DETERIORATION OF CORRODED STEEL BARS
The effects of artificial climate and galvanostatic acceleration on mechanicalproperties of corroded steel bars were studied by tension tests of 56 corroded steel bars thatwere from corroded reinforced concrete members under acceleration condition. The changesof mechanical performance of different steel types under different corrosion extent wereanalyzed and compared,such as changes of yielding strength,ultimate strength,elongationratio and Youngs modulus and so on with different corrosion ratios. The results indicatedthat different steel corrosion surface characters have some effects on mechanical propertiesdegeneration of steel bars,and the effects get more and more significant with corrosion extentincreasing: The stress-strain curve will change significantly,the yield point and stress peakvalue of steels reduce and their corresponding strain decrease; the yield point elongationgradually shortens,strength increases a little after yielding,namely the ultimate-yieldingstrength ratio diminishes; ultimate elongation ratio diminishes and its diminishing extent is fargreater than the reducing extent of section-corrosion ratio; Youngs modulus graduallydecreases as corrosion ratio increases,but it rises definitely again when corrosion reachesdefinite extent; necking phenomenon gets more invisible. Based on the experimental resultsanalysis,the constitutive relation model of corroded steel bars was founded,and it could beconsidered as an application reference for identification and reinforcement of the agingconcrete structure.
steel bar corrosion mechanical properties constitutive relationl
WU Qing YUAN Ying-shu JIANG Jian-hua WANG Shentang
School of Civil Engineering and Architecture,AUST,Anhui 232001,PR China;School of Engineering and Ar School of Engineering and Architecture,CUMT,Jiangsu 221008,PR China Fewell Geotechnical Engineering,Ltd.,Hawaii 96782,U.S.A.
国际会议
The International Conference on Durability of Concrete Structures(2008年混凝土结构耐久性国际学术会议)
杭州
英文
514-521
2008-11-01（万方平台首次上网日期，不代表论文的发表时间）