Why should rebar be inspected for rust before installation?

Inspecting rebar for rust before installation is crucial because rust can significantly weaken the bond between the concrete and the rebar. When rebar is coated in rust, it can create an uneven surface that prevents proper adhesion to the surrounding concrete. This weak bond can result in decreased structural integrity, ultimately compromising the strength and durability of the concrete structure.

In addition to reducing bond strength, rust on rebar can also lead to issues with corrosion over time, which may exacerbate the overall degradation of both the rebar and the concrete. Proper bonding between rebar and concrete is essential to ensure that both materials work together effectively to carry loads and resist stresses throughout the lifespan of the structure. Therefore, maintaining a rust-free surface on rebar is integral to achieving optimal performance in reinforced concrete applications.