What is the minimum concrete cover required for reinforcing steel in concrete exposed to Hawaii's coastal environment?
Correct Answer
A) 2 inches
Coastal environments require increased concrete cover to protect reinforcing steel from salt-induced corrosion. 2 inches is the minimum cover for severe exposure conditions.
Why This Is the Correct Answer
2 inches of concrete cover is the minimum required for reinforcing steel in severe exposure conditions such as Hawaii's coastal environment. This thickness provides a sufficient chloride diffusion barrier to protect the steel from salt-induced corrosion over the structure's design life.
Why the Other Options Are Wrong
Option B: 2.5 inches
2.5 inches is more than the minimum required for coastal exposure. While additional cover provides greater protection, the code-mandated minimum for severe coastal environments is 2 inches, making 2.5 inches a non-minimum answer.
Option C: 3 inches
3 inches of cover is typically required for concrete cast directly against earth (such as footings in contact with soil), not for coastal exposure above grade. Applying this value to coastal wall or column exposure would be conservative but is not the minimum the code specifies for this condition.
Option D: 1.5 inches
1.5 inches is the minimum cover for reinforcing steel in non-exposed, interior concrete members protected from weather. It is insufficient for coastal environments where chloride ions penetrate concrete and accelerate rebar corrosion.
Memory Technique
Remember the cover ladder: 1.5 in (interior) → 2 in (coastal/severe) → 3 in (earth contact). Hawaii coastal = middle rung = 2 inches. Think of the ocean as a '2' wave: it requires the '2-inch' level of protection.
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