1.4. Frequency Range of Surface Vibrators

Try these first

1. 1.

   What is a surface vibrator?

   Hint

   Think about the role it plays in concrete work.

2. 2.

   What is the frequency range of surface vibrators?

   Hint

   Recall the numbers mentioned in our discussions.

3. 3.

   What is the primary function of a surface vibrator?

   • To smooth the surface
   • To apply vibration for consolidation
   • To remove air bubbles

   Hint

   Think about what the main job of this tool is.

4. 4.

   True or False: Surface vibrators can be used for concrete with workability above 75 mm.

   • True
   • False

   Hint

   Consider the implications of high workability on concrete consolidation.

5. 5.

   You are tasked with consolidating a slab that is 200 mm thick and has dense reinforcement. Discuss the best approach and why surface vibrators may be your only option.

   Hint

   Evaluate the situations where internal methods fall short.

6. 6.

   Describe how consolidating a highly workable concrete using surface vibrators could affect the final concrete quality. What precautions would you recommend?

   Hint

   Relate back to the workability and its impact on finishing.