According to quality control standards, concrete cylinder tests show compressive strength of 2,800 psi when the specification requires 3,000 psi. What should the contractor do?
Correct Answer
C) Investigate the cause and determine corrective action with the engineer
When concrete fails to meet specifications, the contractor must investigate the cause and work with the structural engineer to determine appropriate corrective action, which may include additional testing, structural analysis, or remedial measures.
Why This Is the Correct Answer
When concrete test results fail to meet specifications, the proper protocol requires investigation and engineering consultation. The contractor cannot make unilateral decisions about structural adequacy - this requires professional engineering analysis. The engineer must evaluate whether the reduced strength affects structural integrity and determine if remedial action is needed. This collaborative approach ensures safety and compliance with building codes.
Why the Other Options Are Wrong
Option B: Order new concrete immediately
Adding fiber reinforcement cannot compensate for inadequate compressive strength and would require engineering approval. Fibers primarily improve tensile strength and crack control, not compressive strength deficiencies.
Option D: Accept the concrete as it's close to specification
Ordering new concrete immediately is premature without proper investigation. The existing concrete may be salvageable through various remedial measures, and hasty replacement could be costly and unnecessary.
Memory Technique
Think 'INVESTIGATE before you COMPENSATE' - when concrete fails tests, investigation with engineering consultation comes before any corrective measures.
Reference Hint
ACI 318 Building Code Requirements for Structural Concrete, Chapter 26 - Quality Control and Testing
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