What is the purpose of fiber reinforced plastic or zinc coated reinforcing bars?

Fiber reinforced plastic (FRP) and zinc-coated reinforcing bars are primarily used for corrosion resistance in construction materials. Corrosion can significantly weaken the structural integrity of reinforced concrete as the embedded steel bars deteriorate over time due to exposure to moisture, chemicals, and other environmental factors.

The use of fiber reinforced plastic helps protect against corrosion in aggressive environments, such as those involving saltwater or industrial chemicals. Similarly, zinc-coated (or galvanized) reinforcing bars provide a protective layer that shields the steel from corrosive elements, thereby extending the lifespan of the structural components.

This focus on preventing corrosion is crucial as it not only preserves the mechanical properties of the reinforcing bars but also enhances the overall durability and safety of structures. Options related to aesthetic purposes, structural integrity, or thermal insulation are not the primary reasons for using FRP or zinc-coated reinforcing bars, even though they may have some relevance in certain contexts.