APPLICATIONS OF A RAPID NON-DESTRUCTIVE TECHNIQUE IN ASSESSMENT OF CORROSION CONDITIONS OF STEEL IN REINFORCED CONCRETE STRUCTURES
This paper presents some applications of a rapid technique for non-destructiveassessment of corrosion conditions of steel in reinforced concrete structures. The techniqueinvolves a short time galvanostatic pulse measurement followed with the numerical calculation for correcting the preset polarisation current from the measured ohmic and polarisedpotential responses,so as to be able to estimate the true values of ohmic and polarisationresistances related to the confined area. Owing to its rapidity (in a few seconds per measurement),this technique provides a useful tool for mapping electrochemical characteristics ofreinforcement steel in concrete structures,including half-cell potential,ohmic resistivity andcorrosion rate. These three corrosion-related parameters supply better information to aninspector for condition assessment of reinforced concrete structures. It has been shown from anumber of case applications that the measured corrosion rate is in good agreement with theactual visual observations,while the half-cell potential sometimes may mislead the judgement.Even though the resistivity of concrete alone cannot tell much information aboutreinforcement corrosion,it indeed supplies some information that can help the judgement ofcorrosion conditions when used together with the measurement of corrosion rate.
concrete corrosion non-destructive assessment reinforcement
L. Tang
Div.of Building Technology,Chalmers University of Technology,Gothenburg,Sweden,CBI Swedish Cement and Concrete Research Institute,Boras,Sweden
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
1014-1020
2008-11-01（万方平台首次上网日期，不代表论文的发表时间）