Vibration of concrete is described as making it which of the following?

Vibration of concrete is described as making it which of the following?

• A. add more water
• B. increase slump
• C. reduces cure time
• D. become fluid and flowable/consolidated

Answer: (D)

Vibration makes concrete flow and settle, allowing the mix to fill forms and surround reinforcement more easily. By vibrating, the cement paste loses some internal friction against the aggregates, so the concrete becomes more fluid and flowable and air pockets are pushed out, improving consolidation and reducing voids. This effect is about workability and compaction, not about adding water or speeding up curing—over-vibration can cause other issues, but properly applied vibration yields a denser, stronger final concrete.

Vibration makes concrete flow and settle, allowing the mix to fill forms and surround reinforcement more easily. By vibrating, the cement paste loses some internal friction against the aggregates, so the concrete becomes more fluid and flowable and air pockets are pushed out, improving consolidation and reducing voids. This effect is about workability and compaction, not about adding water or speeding up curing—over-vibration can cause other issues, but properly applied vibration yields a denser, stronger final concrete.