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== Common failure modes of steel reinforced concrete ==
[[File:Concrete spall (interior of unit).jpg|thumb|Concrete spalling from the ceiling of an office unit (''interior'') in [[Singapore]], possibly due to rebar corrosion. |alt=|upright]]
Reinforced concrete can fail due to inadequate strength, leading to mechanical failure, or due to a reduction in its durability. Corrosion and freeze/thaw cycles may damage poorly designed or constructed reinforced concrete. When rebar corrodes, the oxidation products ([[rust]]) expand and tends to flake, cracking the concrete and unbonding the rebar from the concrete. Typical mechanisms leading to durability problems are discussed below.
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