Hawaii's building code requires special inspection for concrete placement in seismic zones. At what concrete strength must inspection occur?
Correct Answer
B) All concrete regardless of strength
Hawaii requires special inspection for all concrete placement in seismic zones regardless of strength to ensure proper construction practices.
Why This Is the Correct Answer
Hawaii's building code, consistent with IBC requirements for high seismic risk areas, mandates special inspection for ALL concrete placements in seismic zones regardless of specified compressive strength. Seismic performance depends on proper placement practices, not just mix design, so every pour must be monitored.
Why the Other Options Are Wrong
Option A: Concrete over 3,500 psi only
Limiting inspection to concrete over 3,500 psi is incorrect. The seismic zone requirement is not strength-dependent. Even lower-strength concrete in a seismic zone must be inspected because placement quality (consolidation, curing, reinforcement placement) is critical in all seismic applications.
Option C: Concrete over 2,500 psi only
Limiting inspection to concrete over 2,500 psi is incorrect for the same reason as option A. The seismic zone triggers inspection regardless of strength — it is the location and use, not the mix strength, that determines the inspection requirement.
Option D: Concrete over 4,000 psi only
Limiting inspection to concrete over 4,000 psi is incorrect. High-strength concrete is not the only concern in seismic zones. Any concrete used in a seismic load-resisting system must be inspected regardless of its strength rating.
Memory Technique
Seismic zone = inspect everything. Think: 'In earthquake country, every pour gets a inspector, no matter how weak or strong the mix.' There is no minimum strength threshold — 'ALL' is the answer.
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