The assessment of nonuniform corrosion of rebar is a key issue concerning the reliability of reinforced concrete structures. In this paper, the sectional nonuniform corrosion of plain rebar and the effect of corrosion on bond strength with concrete are studied. The plain rebar in concrete of 52 specimens were fast corroded by using electrochemistry method in a 5% sodium chloride solution. The bond strength of corroded plain rebar in concrete was measured by the central pull-out test. The sectional contour, diameter loss and sectional area loss of corroded plain rebar were detected within the bond length corresponding to the mass loss from 0.1 % to 11.9%. Based on the oretical analysis and test data, the predictive models of the corroded sectional contour line and the bond strength of corroded plain rebar to concrete are built up. The results indicate that the nonuniform corroded sectional contour of plain rebar is approximate elliptical shape, the bond strength can be predicted by using the diameter loss of corroded rebar. Finally, the adaptability of the predictive models is ascertained with the experimental results.

钢筋非均匀腐蚀的评估是关于钢筋混凝土结构可靠性的关键问题。本文研究了普通钢筋的截面非均匀腐蚀以及腐蚀对混凝土粘结强度的影响。通过电化学方法在5％氯化钠溶液中对52个试样的混凝土中的普通钢筋进行了快速腐蚀。通过中心拉拔试验测量了锈蚀的普通钢筋在混凝土中的粘结强度。在对应于质量损失从0.1％到11.9％的粘结长度内，检测到腐蚀了的普通钢筋的截面轮廓，直径损失和截面损失。基于矿石分析和试验数据，建立了锈蚀断面轮廓线的预测模型以及锈蚀后的普通钢筋与混凝土的粘结强度。结果表明，普通钢筋锈蚀断面轮廓不均匀，近似椭圆形，利用锈蚀钢筋的直径损失可以预测其结合强度。最后，通过实验结果确定了预测模型的适应性。