A concrete pour fails the 28-day compressive strength test, testing at 2,800 psi instead of the required 3,000 psi. What should the quality control procedure require?
Correct Answer
D) Order core samples for further testing and structural analysis
When concrete fails strength tests, the proper quality control procedure requires core samples and structural analysis to determine if the concrete can safely remain in place or needs remediation.
Why This Is the Correct Answer
When concrete fails the 28-day compressive strength test, proper quality control procedures require core sampling and structural analysis before making any decisions. This systematic approach determines whether the concrete can safely remain in place with its reduced strength or if remediation is necessary. Core samples provide more accurate in-place strength data than cylinder tests, and structural analysis evaluates if the actual strength meets the safety requirements for the specific application. This methodical process protects both safety and prevents unnecessary costly removal when the concrete might still be structurally adequate.
Why the Other Options Are Wrong
Option A: Accept the concrete as close enough to specification
Immediate removal is premature and potentially unnecessary without first conducting core sampling and structural analysis to determine if the concrete is actually unsafe.
Option B: Immediately remove and replace all affected concrete
Accepting concrete that fails specification without proper investigation is a serious safety violation and liability issue that could compromise structural integrity.
Memory Technique
Think 'CORE before MORE' - always get core samples before doing more drastic actions like removal when concrete fails strength tests.
Reference Hint
ACI 318 Building Code Requirements for Structural Concrete, Chapter 26 - Quality Control and Testing, or Florida Building Code Chapter 19 - Concrete
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