1. Surface Vibrators

Try these first

1. 1.

   What is the main function of surface vibrators?

   Hint

   Think about how vibrations affect the concrete.

2. 2.

   Identify a situation where surface vibrators are necessary.

   Hint

   Consider the limitations of internal vibrators.

3. 3.

   What is the maximum thickness for effective use of a surface vibrator?

   • 100 mm
   • 150 mm
   • 200 mm

   Hint

   Consider the effective depth discussed.

4. 4.

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

   • True
   • False

   Hint

   What was mentioned about workability limits?

5. 5.

   You’re tasked with consolidating a concrete slab that is 200 mm thick using surface vibrators. Discuss the issues you might face.

   Hint

   What are the limits regarding thickness for effective use?

6. 6.

   A construction site is using highly workable concrete. Suggest best practices to avoid surface issues when using surface vibrators.

   Hint

   What is the recommended workability threshold for surface vibrators?