9.2. Bleeding

Try these first

1. 1.

   What is bleeding in concrete?

   Hint

   Think about what happens to water in a liquid concrete mix.

2. 2.

   How can bleeding affect the surface of concrete?

   Hint

   Consider what occurs at the top layer of hardening concrete.

3. 3.

   What is the main cause of bleeding in fresh concrete?

   • Low water-cement ratio
   • Upward movement of water
   • Improper mixing

   Hint

   Remember the definition of bleeding.

4. 4.

   True or False: Laitance forms due to excess bleeding in fresh concrete.

   • True
   • False

   Hint

   What happens when water rises to the surface?

5. 5.

   You are tasked with creating a concrete mix for a hot weather project. Explain how you would adjust the mix to prevent bleeding issues.

   Hint

   Think about materials that can help in hot temperatures.

6. 6.

   During an inspection, you notice significant bleeding in a fresh concrete batch. What steps would you take to assess and rectify the situation?

   Hint

   Focus on factors that contribute to mixing quality and component selection.