为提高再生混凝土中钢筋的抗锈蚀能力，采用煅烧纳米凹凸棒土（CNAT）改善再生混凝土性能，通过电化学加速锈蚀试验和钢筋拉拔试验，研究不同锈蚀时间下CNAT掺量和再生骨料替代率对钢筋锈蚀率、黏结特性及氯离子迁移系数的影响规律，并结合孔径测量结果及扫描电镜表征工具分析再生混凝土的微观结构。研究结果表明：钢筋锈蚀率随再生骨料替代率的增加而增大，随CNAT掺量的增加先减小后趋于稳定；钢筋-混凝土之间的黏结强度和氯离子迁移系数随CNAT掺量的增加呈先增大后减小的变化趋势；CNAT掺量为6%时，再生混凝土的各项性能最佳；掺入适量的CNAT可改善再生混凝土内部孔隙、裂缝及钢筋-再生混凝土之间的黏结滑移性能。研究结果为提高再生混凝土结构性能提供理论参考。

In order to improve the corrosion resistance of steel bars in recycled concrete, calcined nano-attapulgite (CNAT) was used to improve the performance of recycled concrete, The effects of CNAT content and recycled aggregate replacement rate on the corrosion rate, bonding characteristics and chloride ion migration coefficient of steel bars under different corrosion times were investigated through electrochemical accelerated corrosion tests and steel bar drawing tests. The microstructure of recycled concrete was also analyzed by combining the results of pore size measurement and scanning electron microscope characterization tools. The research results show that the corrosion rate of steel reinforcement increases with the rise in the proportion of recycled aggregate substituted, and first decrease and then stabilizes with the increase in CNAT dosage. The bond strength and chloride migration coefficient of reinforcement-concrete demonstrated an initial upward trajectory, followed by a decline with the increase of CNAT dosage. The optimal properties of recycled concrete were achieved at a dosage of 6% CNAT. The addition of an appropriate quantity of CNAT can enhance the internal pore structure, reduce the prevalence of cracks, and improve the bonding and sliding properties between rebar and recycled concrete. The research results provide a theoretical foundation for enhancing the structural performance of recycled concrete.