Chloride-induced corrosion of steel rebar embedded in concrete is one of the major concerns influencing the durability of reinforced concrete structures. It is widely recognized that the carbonation in concrete affects the chloride diffusivity and accelerates chloride-induced reinforcement corrosion. The service load-related cracks also have a dominant influence on reinforcement corrosion. This study aims to investigate the potential impact of concrete carbonation on the chloride penetration resistance, and the rate of corrosion, in RC structures subjected to service-related cracks, which is not yet fully understood within the literature. The experimental programme involves casting concrete prisms (100 × 100 × 500 mm) with different water-cement ratios of 0.4, 0.5 and 0.6 and with four different crack width ranges (0, 0.05–0.15 mm, 0.15–0.25 mm and 0.25–0.35 mm), developed through flexural loading of prisms. These samples were exposed initially to accelerated carbon dioxide (CO₂) environment and then exposed to the accelerated chloride environment. Carbonation depth, chloride penetration, and the degree of corrosion (using half-cell potential and linear polarization resistance) were experimentally measured. The results indicated that (i): The depth of carbonation increases with the increase in crack width and w/c ratio, (ii) chloride penetration depth and chloride concentration profile in concrete structures increases significantly due to the influence of carbonation and (iii) half-cell corrosion potential and linear polarization resistance increases significantly when carbonated concrete samples are exposed to the chloride environment relative to the uncarbonated concrete samples.

氯化物对埋入混凝土中的钢筋的腐蚀是影响钢筋混凝土结构耐久性的主要问题之一。众所周知，混凝土中的碳化会影响氯化物的扩散性并加速氯化物引起的钢筋腐蚀。与服务载荷有关的裂纹对钢筋腐蚀也有主要影响。这项研究的目的是研究混凝土碳酸化对遭受服务相关裂缝的RC结构的抗氯化物渗透性和腐蚀速率的潜在影响，这在文献中尚未完全理解。实验程序涉及浇铸混凝土棱柱（100×100×500 mm），其水灰比分别为0.4、0.5和0.6，裂缝宽度范围为四个（0、0.05-0.15 mm，0.15-0）。25毫米和0.25-0.35毫米），是通过棱镜的弯曲载荷而产生的。这些样品最初暴露于加速二氧化碳（CO₂）环境，然后暴露于加速氯化物环境。实验测量了碳化深度，氯化物渗透和腐蚀程度（使用半电池电势和线性极化电阻）。结果表明：（i）：碳化深度随着裂缝宽度和w / c比的增加而增加；（ii）由于碳化的影响，混凝土结构中的氯离子渗透深度和氯离子浓度分布显着增加；（iii）相对于未碳化混凝土样品，当碳酸混凝土样品暴露于氯化物环境时，半电池腐蚀电位和线性极化电阻会显着增加。