4. Finishing of Concrete

Try these first

1. 1.

   What is the primary purpose of using surface vibrators in concrete?

   Hint

   Think about the limitations of internal vibrators.

2. 2.

   Define screeding in the context of concrete finishing.

   Hint

   It is the first step in the finishing process.

3. 3.

   What is the maximum recommended depth for effective use of surface vibrators?

   • 150 mm
   • 200 mm
   • 100 mm

   Hint

   Focus on the limitations of vibrators discussed.

4. 4.

   True or False: Troweling is the first stage of finishing concrete.

   • True
   • False

   Hint

   Think about the order of operations in finishing.

5. 5.

   You are tasked with finishing a thin slab of concrete that has poor workability. Describe how you would choose finishing methods and why, considering timing and equipment.

   Hint

   Reflect on the limitations imposed by workability and thickness.

6. 6.

   Analyze the impact of excessive finishing on a concrete slab intended for high-traffic use. What precautions should the workers take while finishing?

   Hint

   Consider the relationship between surface integrity and heavy usage.