A quality control inspection reveals that concrete strength test results show 2,800 psi when 3,000 psi was specified. What should be the immediate next step?
Correct Answer
C) Notify the engineer and request structural analysis
When concrete strength tests fail to meet specifications, the structural engineer must be notified to perform an analysis and determine if the reduced strength is acceptable or if remedial action is required. This ensures structural integrity is maintained.
Why This Is the Correct Answer
When concrete strength tests fail to meet specifications, the structural engineer must be notified immediately to perform a structural analysis. The engineer will determine if the reduced strength compromises structural integrity and what remedial actions are necessary. This is the proper protocol to ensure safety and compliance with building codes. Only the engineer can make the determination about whether the concrete is structurally adequate or needs replacement.
Why the Other Options Are Wrong
Option A: Accept the concrete since it's close to specification
Accepting concrete that doesn't meet specifications is a serious code violation and safety risk. A 200 psi difference (6.7% below spec) could compromise structural integrity and is not acceptable without engineering analysis.
Option B: Remove and replace all affected concrete immediately
Immediate removal and replacement is premature and potentially unnecessary. The engineer must first analyze whether the reduced strength is structurally acceptable before deciding on such drastic and expensive action.
Option D: Apply a concrete hardener to increase strength
Concrete hardeners cannot significantly increase the compressive strength of cured concrete. This is not a viable solution for addressing strength deficiencies and would not meet code requirements.
Memory Technique
Think 'ENGINEER FIRST' - when concrete strength fails, the Engineer must analyze First before any other action is taken.
Reference Hint
Florida Building Code, Chapter 19 - Concrete, Section on Quality Control and Testing Requirements
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