Corrosion measurement and analysis of deformed steel bars based on three-dimensional scanning
The corrosion of steel bars induced by chloride attack is mostly non-uniform,which is highly localized with corrosion pits being randomly distributed both along the longitudinal and transverse sections of the bars.Therefore,it is not quite appropriate to predict the residue properties of corroded steel bars and analyze the RC members in service based on the average mass loss.Three-dimensional(3D)laser scanner was used in this study to research the surface of corroded steel bars accurately.First,an accelerated corrosion was adopted to induce non-uniform corrosion of bare steel bars;then,the surface morphology of corroded steel bars was measured by a method of 3D scanning;lastly,the residual cross section and its probability density distribution with different corrosion ratios along the bar length was analyzed.The results indicated that the residual cross section gradually reduced with the corrosion ratio,and the minimum cross-sectional area reduced with a higher rate than the average values.For the steel bars with similar corrosion ratios,the ratio between the minimum and average value of the cross-sectional area was smaller while the standard deviation was larger for the steel bars with larger diameter;in addition,the distribution of the cross-sectional area varied with the corrosion ratio and the steel bar diameter.
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