4.2.1. Screeding

Try these first

1. 1.

   What is the primary purpose of a surface vibrator?

   Hint

   Think about how vibrations help in achieving density.

2. 2.

   What does screeding refer to?

   Hint

   It involves removing excess concrete.

3. 3.

   What is one advantage of using surface vibrators?

   • A) They are always more effective than internal vibrators
   • B) They can work in congested areas
   • C) They require less power
   • D) They double as finishing tools

   Hint

   Consider the situation with dense rebars.

4. 4.

   True or False: Surface vibrators should be used on concrete with a slump greater than 75 mm.

   • True
   • False

   Hint

   Think about the effects of quality on concrete surface.

5. 5.

   Discuss the potential consequences of using a surface vibrator on a high slump concrete mix. Include both immediate and long-term effects on the concrete's properties.

   Hint

   Consider how physical properties might change over time with improper consolidation.

6. 6.

   Imagine a construction site has a mix with variable consistency. Propose a strategy for selecting vibrators that cater to these conditions and justify your choices.

   Hint

   Think about how to adapt to different concrete behaviors.