Alternating current (AC) traction power systems account for 64% of the UK electrified railway network. However, the investigation of stray AC induced corrosion in reinforced segmental lining tunnels is still very limited. Electrochemical modelling and numerical simulation, validated by the experimental data, indicate that the severity of stray AC induced steel reinforcement corrosion mainly depends on the AC current density, frequency and the chloride content in concrete. Concrete containing discontinuous steel fibres has an inherent corrosion resistance to stray AC attacks due to the electrical double layer developed on the steel surface; the presence of chloride ions in the concrete pore solution however reduces the corrosion resistance. Special attention is therefore needed for steel fibre reinforced concrete (SFRC) subjected to AC current in the presence of high concentration chloride.

交流牵引电力系统占英国电气化铁路网络的64％。然而，杂散交流感应腐蚀在加筋分段衬砌隧道中的研究仍然非常有限。实验数据验证了电化学建模和数值模拟结果，表明交流杂散引起的钢筋锈蚀的严重程度主要取决于交流电流密度，频率和混凝土中的氯化物含量。含有不连续钢纤维的混凝土由于在钢表面形成了双电层，因此具有固有的抗杂散AC腐蚀的能力。然而，混凝土孔隙溶液中氯离子的存在会降低其耐腐蚀性。