Stray current, leakage current, alternating current, high-voltage tension, electrocorrosion, artificial constructions, protective screens

Abstract

The destructive effects of the corrosive effects of stray and leakage currents are observed in almost all industries.The question is the most relevant for the railways. It is known that direct (DC) leakage currents and stray currents cause significant corrosion damage. It is supposed that corrosion from alternating current exposure is more moderate and does not cause significant damage. However, the analysis of literature data, data of theoretical, experimental and exploitative research indicates a significant destructive effect of alternating leakage current and high voltage on the structures of railway facilities in Ukraine. At the same time, measures to prevent electrocorrosion of reinforced concrete and other structures by alternating current are not provided for in the regulatory documents for railway structures. One of the reasons for this is the specificity of the processes of electro-corrosion of concrete, reinforced concrete and mortar in flooded structures.All existed methods of protection against electro-corrosion do not take into account the real mechanism of corrosion destruction of non-metallic parts of the structure. Based on this, it became necessary to develop schemes and constructive solutions for the protection of railway structures against electrocorrosion caused by alternating current, based on the fundamental principles of colloidal chemistry and physico-chemical mechanics.Developed measures and constructive solutions for the protection of concrete, reinforced concrete and stone engineering structures of railways from electrocorrosion caused by alternating high-voltage and leakage currents: solid steel screen with a deep grounding; mesh screens at the bottom of the supports with deep grounding; liquid glass screen with deep grounding. The effectiveness of the developed measures is caused by taking into account the actual mechanism of destruction of steel reinforcement and concrete structures.