The role of fiber-reinforced and self-healing concrete in enhancing U.S. infrastructure durability

The durability of U.S. infrastructure has become a critical concern, as aging systems and increasing environmental stresses continue to strain the nation’s roads, bridges, and public structures. Over 40% of U.S. roadways are in poor or mediocre condition, while more than 46,000 bridges are structurally deficient. Conventional concrete, though widely used, is prone to cracking, corrosion, and structural fatigue, contributing to mounting maintenance costs and safety risks. This review paper explores the role of fiber-reinforced concrete (FRC) and self-healing concrete (SHC) as innovative solutions for enhancing the durability and resilience of U.S. infrastructure. The scope of the review encompasses recent advancements in FRC and SHC technologies, their mechanical and durability characteristics, and real-world applications in various infrastructure sectors. FRC integrates synthetic or natural fibers such as steel, glass, or polypropylene into the concrete mix to improve tensile strength, crack resistance, and impact durability. Meanwhile, SHC leverages biological or chemical agents such as bacterial spores or encapsulated healing agents that autonomously repair microcracks when exposed to water or environmental stimuli. Key findings highlight that FRC significantly enhances structural performance under cyclic loading and extreme environmental conditions, thereby extending service life and reducing maintenance frequency. SHC, on the other hand, shows promise in prolonging infrastructure lifespan by restoring structural integrity autonomously without human intervention. Together, these technologies present a sustainable and cost-effective approach to addressing the infrastructure durability crisis in the U.S. This paper recommends broader adoption of fiber-reinforced and self-healing concrete in federal and state infrastructure projects, particularly in high-stress applications such as highways, tunnels, and marine structures. Future research should focus on improving cost-efficiency, scalability, and the long-term performance of SHC systems in diverse climates. Integrating smart sensing and AI-based monitoring tools with these advanced materials may further revolutionize infrastructure maintenance and durability strategies. Keywords: Fiber-Reinforced Concrete, Self-Healing Concrete, Infrastructure Durability, Concrete Innovation, Structural Performance, Sustainable Construction Materials, Smart Infrastructure.