In recent years, a series of environmental challenges driven by rising global temperatures have drawn widespread attention from countries around the world. Rising sea temperatures have directly caused the death of some coral reefs, and experts in marine ecological restoration argue that cultivating coral reefs to expand their coverage can effectively mitigate the destructive impact of waves on coastal areas.

In marine ecological restoration projects, deploying concrete prefabricated blocks on the seabed and directly cultivating coral reefs on these blocks can effectively enhance coral survival rates and expand the area of reef protection. When manufacturing these concrete prefabricates, replacing conventional steel reinforcement with glass fiber reinforced polymer (GFRP) bars can significantly extend the service life of the structures. Compared to steel, GFRP exhibits superior corrosion resistance, offering unique advantages in marine environments. Marine settings are rich in chloride ions, which cause conventional steel to corrode and expand, leading to concrete cracking. In contrast, GFRP is highly resistant to acid, alkali, and salt exposure, maintaining stable performance even after prolonged immersion in seawater, thereby substantially prolonging the service life of artificial reefs, slope‑stabilizing structures, and other ecological restoration facilities. Moreover, GFRP composites combine higher strength with lower weight: their tensile strength is roughly twice that of steel of comparable dimensions, while their density is only one quarter of steel. This lightweight characteristic not only reduces transportation and lifting costs but also alleviates workers’ physical strain. Traditional reinforced‑concrete structures in marine environments typically require periodic anti‑corrosion maintenance, whereas GFRP‑based systems remain virtually maintenance‑free throughout their design life, resulting in a substantial reduction in life‑cycle costs.

In summary, concrete precast blocks reinforced with glass fiber exhibit comprehensive advantages—corrosion resistance, high strength and light weight, long service life, and low maintenance—providing a more durable and cost-effective solution for marine ecological restoration.