9. Topics in Hardened Concrete

Try these first

1. 1.

   Define compressive strength.

   Hint

   Think about how concrete is used in structures.

2. 2.

   What is creep in concrete?

   Hint

   Consider how concrete changes under constant weight.

3. 3.

   What is compressive strength?

   • Ability to resist axial compressive load
   • Ability to resist axial tensile load
   • Ability to resist bending

   Hint

   Think about the forces acting on concrete in buildings.

4. 4.

   True or False: Creep is an instantaneous deformation.

   • True
   • False

   Hint

   Consider how the load affects concrete over time.

5. 5.

   A concrete structure with a compressive strength of 50 MPa is showing signs of cracking. Discuss potential factors contributing to this issue.

   Hint

   Consider how mixing and curing practices affect the final concrete quality.

6. 6.

   Propose a strategy to reduce the risk of shrinkage in a large concrete pavement project.

   Hint

   Think about steps that can be taken during and after mixing.