This project falls within the category of civil construction science and technology, specifically in the field of concrete and reinforced concrete structures. It is supported by funding from national natural science foundations and other projects, as well as strong support from various research teams. Focusing on the significant needs of China's infrastructure construction, this project addresses the current problem where steel reinforcement in reinforced concrete structures is prone to corrosion in harsh environments such as high chloride, and the difficulty in permanently curing it after chiseling and repairing. Starting from the electrochemical nature of steel corrosion, combined with environmental characteristics and comprehensive consideration of requirements for existing and new construction projects, this project has developed a set of innovative technical systems for reinforced concrete corrosion protection. These include thermoelectric autonomous external current cathodic protection technology, zinc mesh/electrochemical active mortar sacrificial anode cathodic protection technology, and permeable high-performance reinforced concrete anti-rust technology. The ultimate goal is to achieve long-term service life of reinforced concrete structures under harsh operating conditions. 1. Main scientific and technological innovations ( 1) In response to the characteristics of reinforced concrete exposed to harsh environments and atmospheric conditions, which are subject to multiple erosions such as chloride salts and carbonation, comprehensive optimization has been carried out on materials and systems through several levels of research including conductive mechanism modeling, preparation of conductive substrates, and deployment of thermoelectric structures. A thermoelectric autonomous external current cathodic protection technology has been developed. Utilizing the self-generation of electricity from temperature differences in this thermoelectric system, forced cathodic protection can be implemented for reinforced concrete structures in harsh atmospheric environments without the need for external power supply, achieving green and low-cost protection for reinforced concrete structures and significantly extending the service life of infrastructure. (2) In response to the corrosion characteristics of marine tidal zone splash zones with alternating wet and dry conditions and repeated salt crystallization, a grid-shaped zinc sacrificial anode has been designed based on the principle of cathodic protection using sacrificial anodes, and an active mortar material has been developed for coating to maintain the electrochemical activity of the zinc anode. The physical and mechanical properties of active mortar materials were systematically analyzed, as well as the electrochemical performance of zinc mesh anodes in active mortar, revealing the mechanism by which the active components maintain the stable activation and dissolution of the anode. The developed zinc mesh/electrochemical active mortar repair material and technology have formed implementation specifications for repairs and protection, achieving economical and long-term restoration and protection of reinforced concrete structures under harsh marine chloride conditions. (3) For engineering structures in severe environments where electrochemical cathodic protection is difficult to implement, through the optimization of component combinations, a penetrating high-performance steel reinforcement rust inhibitor that can be both internally mixed and externally applied has been developed. This rust inhibitor can generate insoluble salts to block the permeation pathways in the substrate, increase the pH value of the pore fluid near the steel reinforcement to maintain the passivation film of the steel reinforcement, and form a protective film on the surface of the steel reinforcement. These effects simultaneously enhance the corrosion resistance of the steel reinforcement in corrosive environments. New rust inhibitors have been widely applied in the corrosion protection of steel reinforcement in both existing and newly constructed structures, achieving significant results in preventing corrosion. 2. Main Scientific and Technological Achievements: The project has applied for 8 patents, including 5 authorized invention patents and 2 authorized utility model patents; published 19 papers, with 15 being indexed by SCI/EI, 4 in core journals, and a total of 73 citations; participated in the compilation of 1 national standard; and published 1 monograph. The achievements have been recently searched by authoritative institutions and evaluated by renowned experts both domestically and internationally, indicating that the project as a whole has reached an international advanced level. 3. Application and Economic and Social Benefits: The project's results have been successfully applied in multiple key projects, demonstrating the advantages of new reinforced concrete protection technology. Over the past three years, it has cumulatively added 359.4 million yuan to industrial output value, generated 32.057 million yuan in new profits, contributed 8.894 million yuan in new taxes, saved 2.38 million yuan in costs, and achieved significant economic benefits. The achievements have formed systematic independent intellectual property rights, not only enhancing the technical level of reinforced concrete corrosion protection but also promoting technological progress and sustainable development in industries such as civil engineering, water conservancy, and construction, with significant social benefits.