3. Placing of Concrete

Try these first

1. 1.

   Why should concrete be placed close to its final position?

   Hint

   Think about how handling affects the mixture.

2. 2.

   What is segregation in concrete?

   Hint

   Consider what might happen if materials are not mixed well.

3. 3.

   What is the maximum height from which concrete can be dropped?

   • 1.0 meters
   • 1.5 meters
   • 2.0 meters

   Hint

   Consider the guidelines mentioned.

4. 4.

   True or False: Segregation can improve concrete strength.

   • True
   • False

   Hint

   Think about how the mixing affects strength.

5. 5.

   Design a small-scale concrete pouring operation for a garden slab. What methods would you choose and why?

   Hint

   Consider the size of tools and ease of movement.

6. 6.

   Analyze the implications of placing concrete without following the specified 30-minute rule.

   Hint

   Think about what happens to a mixture that's left sitting.