1.6. Limitations of Surface Vibrators

Try these first

1. 1.

   What is the main function of surface vibrators?

   Hint

   Think about how they operate.

2. 2.

   Why are internal vibrators preferred over surface vibrators?

   Hint

   Consider effectiveness.

3. 3.

   What is a major limitation of surface vibrators?

   • They cannot be used on any type of concrete
   • They are less effective than internal vibrators
   • They are illegal to use

   Hint

   Think about the comparison between their functions.

4. 4.

   Surface vibrators should not be used for concrete with workability greater than which measurement?

   Hint

   Check the workability threshold discussed.

5. 5.

   Consider a construction project where the concrete to be placed has a slump of 80 mm and a depth of 200 mm. Discuss the implications of using surface vibrators in this scenario.

   Hint

   Assess both workability and depth limits.

6. 6.

   A contractor needs to consolidate a heavily reinforced slab. They are considering both surface and internal vibrators. Advise them on the best choice and reasons why.

   Hint

   Focus on the effectiveness of each method based on reinforcement density.