9.1. Precast and Prestressed Concrete

Try these first

1. 1.

   What is creep in concrete?

   Hint

   Think about the time dependency of deformation in materials.

2. 2.

   Name the two primary types of shrinkage.

   Hint

   Consider the types connected with moisture loss.

3. 3.

   What does creep in concrete primarily result from?

   • Rapid loading
   • Time-dependent load
   • High temperatures

   Hint

   Think about how time impacts concrete under constant stress.

4. 4.

   True or False: Shrinkage always occurs under load.

   • True
   • False

   Hint

   Consider the definitions of shrinkage and loading conditions.

5. 5.

   A prestressed concrete beam is experiencing excessive bending due to unaccounted creep. Discuss the steps you would recommend to the design team for mitigating this issue.

   Hint

   Consider material properties and environmental factors that could alter the design.

6. 6.

   During a project review, it became apparent that the precast panels were cracking. Analyze what factors might contribute to this issue based on creep and shrinkage phenomena.

   Hint

   Reflect on how environmental influences and material choices impact performance.