The application of composite materials in the field of roads and bridges is mainly reflected in the following aspects:

Anti-corrosion coating: Composite materials are widely used in anti-corrosion coating in large bridge projects such as the Hong Kong-Zhuhai-Macao Bridge due to their high performance, light weight and high strength, effectively extending the service life of the bridge.
Polymer plastic formwork: In the process of bridge construction, polymer plastic formwork made of composite materials has played an important role, improving construction efficiency and quality.
Bridge structure materials: Since the 1970s, FRP (fiber reinforced plastic) materials have begun to be tried in bridge projects. Countries such as the United Kingdom, the United States and Israel first used this new material as the main component in building structures and bridge structures. my country also built the world’s first glass fiber composite highway bridge in 1982.
Bridge reinforcement and repair: Carbon fiber composite material (CFRP) reinforcement and repair of concrete structures is widely used in bridge reinforcement projects. By pasting composite material plates, the bending bearing capacity, shear bearing capacity and axial compressive bearing capacity of the bridge and the compressive members are improved, the stiffness and ductility of the members are improved, and the development of crack width of concrete members is controlled.
Adaptability to special environments: For bridge construction in special environments, such as saline-alkali environments or areas where antifreeze is sprayed, corrosion-resistant materials such as carbon fiber composite cables are used to make prefabricated PC (prestressed concrete) bridge decks, without the need to add the anti-corrosion covering layer required for traditional steel bars.
Rapid construction and demolition: For highway bridges that need to be built or demolished quickly, fiber-reinforced resin-based composite materials can significantly improve construction efficiency due to their light weight and easy construction.
Ornamental bridge construction: In the construction of ornamental bridges, fiber-reinforced composite materials can meet the aesthetic requirements of bridge service life, safety, appearance design, and artistic modeling due to their excellent mechanical properties, diverse material styles, low density, and easy installation.
In summary, the application of composite materials in the field of roads and bridges is extensive and in-depth, from basic structural materials to reinforcement and repair technologies, to special environments and rapid construction needs, all of which have demonstrated their unique advantages and broad development prospects. With the continuous advancement and innovation of technology, the application of composite materials in the field of roads and bridges will be more extensive and in-depth.