4.2. Stages of Finishing

Try these first

1. 1.

   What is the purpose of a surface vibrator?

   Hint

   Consider where the vibration is applied.

2. 2.

   What are the three main stages of finishing?

   Hint

   Think of the process from leveling to polishing.

3. 3.

   What is the primary advantage of internal vibrators over surface vibrators?

   • They are cheaper
   • They consolidate more effectively
   • They are easier to use

   Hint

   Consider how vibration is applied.

4. 4.

   TRUE or FALSE: Surface vibrators are effective for slabs thicker than 150 mm.

   • True
   • False

   Hint

   What did the text say about effective depth?

5. 5.

   You observed a mixture with a slump of 80 mm being vibrated with surface vibrators. Discuss the ramifications of this choice.

   Hint

   Recall the risks associated with high workability.

6. 6.

   Design a workflow process for finishing a concrete slab, detailing when to use each finishing technique.

   Hint

   Consider the importance of timing at each stage.