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Q: Which vibrators are used for road slabs?
  • A. Shutter vibrators
  • B. Surface vibrators
  • C. Vibrating vibrators
  • D. Internal vibrators
Correct Answer: Option B - Surface vibrators- These are useful for the compaction of flat and thin concrete surface (<15cm) such as floor slab, roof slab, road surface. • vibratory roler is used to compaction of very dry and lean concrete. • Form or external vibrates are used for concreting columns, thin wall, and the casting of precast structure.
B. Surface vibrators- These are useful for the compaction of flat and thin concrete surface (<15cm) such as floor slab, roof slab, road surface. • vibratory roler is used to compaction of very dry and lean concrete. • Form or external vibrates are used for concreting columns, thin wall, and the casting of precast structure.

Explanations:

Surface vibrators- These are useful for the compaction of flat and thin concrete surface (<15cm) such as floor slab, roof slab, road surface. • vibratory roler is used to compaction of very dry and lean concrete. • Form or external vibrates are used for concreting columns, thin wall, and the casting of precast structure.