A structural engineer specifies that concrete must reach 3,000 PSI strength before removing forms. The contractor's schedule requires form removal in 3 days, but the engineer's testing shows only 2,400 PSI. What should the contractor do?
Correct Answer
C) Wait for engineer approval before removing forms
The contractor must follow the engineer's specifications for structural safety. Removing forms before achieving specified strength could compromise structural integrity and violate professional standards. The engineer's approval is required before proceeding.
Why This Is the Correct Answer
Option B is correct because structural specifications set by engineers are mandatory safety requirements that cannot be compromised. The engineer specified 3,000 PSI for a reason - this is the minimum strength needed to safely support the structure's loads. Since testing shows only 2,400 PSI (80% of required strength), removing forms could lead to structural failure, potential collapse, and serious safety hazards. The contractor must wait for the engineer's professional assessment and approval before proceeding with form removal.
Why the Other Options Are Wrong
Option B: Remove forms but leave supports in place
Removing forms while leaving supports is still unsafe because the concrete hasn't reached the specified strength. The forms themselves provide critical support during the curing process, and partial removal could create uneven loading conditions that the weakened concrete cannot handle safely.
Option D: Request the engineer to lower the strength requirement
Removing forms as scheduled would violate the engineer's specifications and create serious safety risks. The concrete has not reached the required strength to safely support structural loads, and prioritizing schedule over safety could result in structural failure, injuries, legal liability, and code violations.
Memory Technique
Think 'Engineer Says, Contractor Waits' - when structural specs aren't met, the engineer's approval is always required before proceeding with critical construction activities like form removal.
Reference Hint
Florida Building Code Chapter 19 (Concrete) and ACI 318 standards for concrete strength requirements and form removal procedures
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