Research Progress and Performance Evaluation of Repair Materials for Damaged Concrete Structures in Marine Environments

Research on rapid-repair concrete for marine environments is dedicated to addressing the deterioration of infrastructure under harsh marine conditions. By developing specialty materials and processes that feature rapid hardening, early strength, high durability, and good workability, it aims to achieve swift and durable repairs of key projects such as ports and sea-crossing bridges. This shortens maintenance windows, reduces economic losses, and ensures structural safety. However, this field still faces challenges at multiple levels: at the material level, it is difficult to balance "rapidity" and "durability"; the interface between old and new concrete is weak; underwater anti-washout performance is insufficient; at the engineering level, there is poor adaptability to complex working conditions, difficulties in quality control, and a lagging standard system; at the comprehensive level, costs are high, life-cycle assessment systems are incomplete, and integration with intelligent technologies is inadequate. This research holds significant strategic and practical importance for supporting the "Maritime Power" strategy, ensuring the safety of maritime routes under the "Belt and Road" initiative, and enhancing the resilience of critical infrastructure. It is also a key practice for implementing marine ecological civilization and promoting the sustainable development of the marine economy. Future research should focus on the long-term performance evolution mechanisms under the coupled effects of materials, structures, and the environment. Efforts should be made to develop low-cost, highly compatible, and environmentally friendly repair systems, and to promote the deep integration of digital design, intelligent monitoring, and automated construction. Ultimately, the goal is to establish a comprehensive technical system for marine engineering repair that integrates rapidity, durability, and intelligence.