The corrosion of steel strands due to the chloride contamination is one of the most common causes for the degradation of prestressed concrete infrastructure. In this paper, an experimental study was performed to investigate the bond behaviors between steel strands and concrete after suffered the chloride corrosion. Total twenty central and off-center pull-out specimens with different corrosion levels were prepared and tested, in which the electrochemical acceleration method was employed to induce various corrosion levels. The effects of corrosion rate, stirrup configuration and holding condition of concrete to the steel strands on the bond behaviors of steel strands were studied and compared, in terms of the failure mode, bond-slip relationship, bond strength, and bond toughness. The results show that both the ultimate bond strength and characteristic bond strength decreased with the increase of corrosion degree. The presence of stirrups can significantly enhance the bond performance, indicating the more ductile failure characteristic and increased bond toughness. Moreover, the prediction results using empirical and analytical models are also compared with the experimental results to verify their applicability and accuracies in predicting the bond strength of steel strands after corrosion.

由于氯化物污染引起的钢绞线腐蚀是预应力混凝土基础设施退化的最常见原因之一。在本文中，进行了试验研究，以研究钢绞线与混凝土在遭受氯化物腐蚀后的粘结行为。制备和测试了总共20个不同腐蚀程度的中心和偏心拉出试样，其中采用电化学加速方法诱导不同腐蚀程度。从破坏模式、粘结滑移关系、粘结强度和粘结韧性等方面研究和比较了腐蚀速率、箍筋配置和混凝土对钢绞线的保持条件对钢绞线粘结性能的影响。结果表明，随着腐蚀程度的增加，极限结合强度和特征结合强度均降低。箍筋的存在可以显着提高结合性能，表明更具延展性的破坏特性和增加的结合韧性。此外，还将使用经验和分析模型的预测结果与实验结果进行比较，以验证它们在预测腐蚀后钢绞线结合强度方面的适用性和准确性。