A vibrator is used carefully around congested reinforcing in a wall lift. The main purpose of consolidation is to accomplish which result?
Correct Answer
C) Remove entrapped air and make concrete flow around reinforcement without segregation
Proper consolidation removes entrapped air and helps concrete fully surround reinforcement and embedded items without causing segregation. Other choices: vibration is not water addition, segregating aggregate is a defect, and curing is still required.
Why This Is the Correct Answer
Proper consolidation removes entrapped air and helps concrete fully surround reinforcement and embedded items without causing segregation.
Why the Other Options Are Wrong
Option A: Make add water to improve pumpability the answer for consolidation
The trap in A is Add water to improve pumpability. That selection is wrong because the choice would not get the project to Remove entrapped air and make concrete flow around reinforcement without segregation, which is the Consolidation result verified by the source; C.
Option B: The superintendent should move all aggregate to the bottom of the form
Choice B gives Move all aggregate to the bottom of the form. Its specific error: the option does not produce the required Consolidation outcome, Remove entrapped air and make concrete flow around reinforcement without segregation.
Option D: The superintendent should replace the need for curing as though it satisfied the specific consolidation requirement
In concrete work, Replace the need for curing is the wrong selection for Consolidation: the option tries to substitute, waive, or delete the Consolidation control; the item instead requires Remove entrapped air and make concrete flow around reinforcement without segregation.
Memory Technique
Picture consolidation doing the job; the answer names that job as Remove entrapped air and make concrete flow around reinforcement without segregation.
Reference Hint
Open The Contractor's Guide to Quality Concrete Construction, 4th Ed., 2018; use the index entry or section for "Concrete consolidation" to confirm that Proper consolidation removes entrapped air and helps concrete fully surround reinforcement and embedded items without causing segregation.
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