9. Segregation and Bleeding in Fresh Concrete

Try these first

1. 1.

   What is segregation in concrete?

   Hint

   Think about how components might separate when mixed improperly.

2. 2.

   Name one cause of bleeding.

   Hint

   Consider the behavior of heavy solids in a liquid.

3. 3.

   What is segregation in fresh concrete?

   • Separation of aggregates
   • Increase in water content
   • Formation of laitance

   Hint

   Think of the outcome of a poorly mixed batch.

4. 4.

   Bleeding occurs when water moves upwards in fresh concrete due to:

   • True
   • False

   Hint

   This is a direct result of weight differences among concrete components.

5. 5.

   You are designing a concrete mix for a high-rise building. Describe how you would address potential problems of segregation and bleeding during the mixing and placement phases.

   Hint

   Think about the design considerations necessary for structural integrity.

6. 6.

   Evaluate a scenario where excessive bleeding observed in a concrete pour leads to surface failure. Describe potential rectifications that could be implemented in future pours.

   Hint

   Consider how material selection impacts the characteristics of fresh concrete.