How does rebar corrosion affect structural integrity?

Reinforcement bars, or rebar, are critical components in concrete structures, providing the tensile strength that concrete lacks. Corrosion of rebar occurs when moisture and oxygen penetrate the concrete and initiate a chemical reaction that deteriorates the steel. This corrosion can lead to the expansion of the steel, creating internal stresses within the concrete.

As rebar corrodes, it loses its cross-sectional area, which directly impacts its load-bearing capacity. Additionally, the rust formed during corrosion can disrupt the bond between the rebar and concrete, compromising the structural integrity of the entire assembly. This weakened bond allows for the development of micro-cracks in the concrete, which may eventually lead to more significant cracking and structural failure. These processes highlight the importance of maintaining the integrity of rebar as corrosion not only degrades the steel itself but also the concrete that relies on it for support.

In contrast, the other choices do not accurately reflect the consequences of rebar corrosion. The idea that corrosion improves the bond or has no effect ignores the fundamental mechanics of steel and concrete interaction. Similarly, the notion that corrosion enhances flexibility of the rebar misrepresents the nature of steel, which becomes more brittle rather than flexible as it deteriorates. Thus, understanding rebar corrosion