7.1. Properties of Fresh Concrete

Try these first

1. 1.

   What is workability in concrete?

   Hint

   Think about how the concrete behaves when you try to mix or pour it.

2. 2.

   Define segregation.

   Hint

   What happens when the heavy parts of a mix separate?

3. 3.

   What property of fresh concrete allows it to be easily mixed, transported, and placed?

   • Workability
   • Cohesiveness
   • Consistency

   Hint

   Think of how easily you can pour concrete.

4. 4.

   Segregation occurs when:

   • True
   • False

   Hint

   Consider what happens when parts of a mixture stratify.

5. 5.

   You are preparing a concrete mix for a project in a high-temperature environment. Describe how you would adjust your mix to ensure proper workability and prevent rapid slump loss.

   Hint

   Consider how heat affects water behavior in your mix.

6. 6.

   A construction site reports issues with segregation in their concrete mix during pumping. Identify potential causes and suggest solutions.

   Hint

   Think about what physical principles might reduce the effectiveness of a concrete mix.