Microbial self-healing concrete (SHC) is a biomimetic smart material with microbial carriers to repair microcracks. This paper investigates the mechanism of Cl⁻ transport and the repair performance of SHC based on recycled coarse aggregate (RCA) as microbial carriers. To assess the repair effectiveness to hinder Cl⁻ corrosion, it is necessary to understand the ionic interactions and mechanism that occur among Cl⁻, the repair effectiveness and the carriers. In this study, the principle of RCA carrier is discussed, and the relationship between carrier and repair efficiency is analysed. In addition, the time-varying model of crack repair efficiency and the model for calculating the equivalent diffusion coefficient of Cl⁻ in cracks are presented. A wet-dry cycle corrosion test is established to investigate the phase morphology and ionotropy between Ca⁺ and Cl⁻. The mode of ion transport along the pores is summarized, and the model describing the time-variation and diffusion coefficient is verified.

微生物自修复混凝土（SHC）是一种具有微生物载体的仿生智能材料，可修复微裂纹。本文研究了以再生粗骨料（RCA）为微生物载体的Cl ^-传输机制和SHC的修复性能。为了评估阻止Cl ^-腐蚀的修复效果，有必要了解Cl ^-、修复效果和载体之间发生的离子相互作用和机理。本研究讨论了RCA载体的原理，分析了载体与修复效率的关系。此外，裂纹修复效率的时变模型和计算Cl等效扩散系数的模型^-在裂缝中出现。建立了干湿循环腐蚀试验以研究Ca ⁺和Cl ^-之间的相形貌和离子性。总结了离子沿孔隙的传输方式，并验证了描述时变和扩散系数的模型。