AL Water Projects Practice Questions - Alabama Water Projects Contractor Examination Exam

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A finisher holds a vibrator in one spot in a tank wall until a large slurry patch appears and coarse aggregate has sunk away. What is the problem?

Over-vibration is causing segregation, which leaves a weak, permeable paste layer The wall is now as watertight as it can be Segregation only occurs in shotcrete, never in formed concrete The slurry patch proves the water-cementitious ratio was too low

Correct Answer:

Over-vibration is causing segregation, which leaves a weak, permeable paste layer

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