This project belongs to the discipline of concrete and reinforced concrete structures within the scope of civil engineering science and technology. Relying on funding from projects such as the National Natural Science Foundation of China and the strong support of various units of the R & D team, this project focuses on the major needs of my country's infrastructure construction. In view of the fact that steel bars in reinforced concrete structures are prone to corrosion and difficult to cure after chiseling and repair under harsh environments such as high chloride salts, starting from the electrochemical nature of steel bar corrosion, combining environmental characteristics and comprehensively considering the requirements of existing and new projects, we have developed thermoelectric independent impressed current cathode protection technology, Zinc mesh/electrochemically active mortar sacrificial anode cathodic protection technology and permeable high-performance reinforced concrete corrosion resistance technology have formed a complete set of innovative technical systems for reinforced concrete corrosion protection, ultimately achieving long-term reinforced concrete structures under severe service conditions. The purpose of service life. 1. Main scientific and technological innovations (1) Aiming at the characteristics of reinforced concrete exposed to the atmosphere that suffers multiple erosion such as chloride salts and carbonization under harsh environments, we have studied materials and materials through several levels of research such as conductive mechanism modeling, conductive substrate preparation, and thermoelectric structure layout. Comprehensive optimization of the system, and developed thermoelectric autonomous impressed current cathodic protection technology. Taking advantage of the temperature difference self-generation characteristics of the thermoelectric system, mandatory cathodic protection can be implemented on reinforced concrete structures in harsh atmospheric environments without external power supply, achieving the green and low-cost protection of reinforced concrete structures and greatly extending the service life of infrastructure. (2) Aiming at the corrosion characteristics of alternating wet and dry and repeated salt crystallization in the ocean tidal range splash zone, based on the cathodic protection principle of sacrificial anodes, a grid-shaped zinc sacrificial anode was designed, and an active mortar material was developed to coat it to maintain the electrochemical activity of the zinc anode. The physical and mechanical properties of active mortar materials and the electrochemical properties of zinc mesh anodes in active mortar were systematically analyzed, revealing the mechanism by which active components maintain stable activation and dissolution of the anodes. The developed zinc mesh/electrochemically active mortar repair materials and technologies have formed a specification for repair and protection, achieving economic and long-term repair and protection of reinforced concrete structures under harsh marine conditions of high chloride salts. (3) For engineering structures that are in harsh environments and are difficult to implement electrochemical cathodic protection, a permeable high-performance steel bar rust inhibitor that can be both internally mixed and externally coated has been developed through component compatibility optimization. The rust inhibitor can generate poorly soluble salts to block the penetration channels in the matrix, increase the pH value of the pore liquid near the steel bar to maintain the passivation film of the steel bar, and form a protective film on the surface of the steel bar. The above effects simultaneously enhance the steel bar's corrosion resistance in an corrosive environment. The new corrosion inhibitor has been widely used in the corrosion protection of steel bars in existing and newly built structures, and has achieved remarkable corrosion protection effects. 2. The main scientific and technological achievement projects applied for 8 patents, including 5 authorized invention patents and 2 authorized utility model patents; published 19 papers, including 15 SCI/EI searches and 4 core journals, with a total of 73 citations; participated in the compilation of 1 national standard; published 1 monograph. The results have been recently searched by authoritative organizations and evaluated by famous experts at home and abroad: the overall project has reached the international advanced level. 3. The promotion and application situation and the results of economic and social benefits projects have been successfully applied in many key projects, reflecting the advantages of new reinforced concrete protection technology. In the past three years, the cumulative new output value has been 359.4 million yuan, the new profit has been 32.057 million yuan, and the new tax revenue has been increased. 894 million yuan, saving 2.38 million yuan, and remarkable economic benefits. The results have formed a system of independent intellectual property rights, which not only improves the technical level of reinforced concrete corrosion protection, but also promotes scientific and technological progress and sustainable development in civil engineering, water conservancy, construction and other industries, with significant social benefits.