11.1. Definition

Try these first

1. 1.

   What is rheology?

   Hint

   Think about how materials like concrete behave when they are moving.

2. 2.

   Define yield stress in concrete.

   Hint

   Consider what needs to happen for concrete to start moving.

3. 3.

   What is the yield stress?

   • The maximum stress concrete can withstand
   • The minimum stress required for flow
   • The stress at which concrete hardens

   Hint

   Think about what needs to happen to get concrete moving.

4. 4.

   True or False: Plastic viscosity affects how easily concrete can flow after it is set.

   • True
   • False

   Hint

   Consider what happens to concrete once it sets.

5. 5.

   Compare the effects of high yield stress and low yield stress on a concrete mixture's performance in different construction scenarios.

   Hint

   Think about how placement impacts strength and uniformity.

6. 6.

   Design a concrete mix that requires specific rheological properties for a high-rise construction project considering factors like yield, viscosity, and external conditions.

   Hint

   What environment impacts your design the most?