4.3.5. Compressive Strength Test

Try these first

1. 1.

   What is the compressive strength requirement for OPC at 28 days?

   Hint

   Think about the standard strength requirements for concrete used in construction.

2. 2.

   What ratio is used to prepare the mortar cubes for the compressive strength test?

   Hint

   Consider how we balance sand with cement to create a workable mix.

3. 3.

   What is the minimum compressive strength for OPC after 28 days?

   • 20 MPa
   • 33 MPa
   • 50 MPa

   Hint

   This is based on the standard requirements for concrete used in typical structures.

4. 4.

   True or False: The compressive strength test is conducted on cement paste, not on mortar cubes.

   • True
   • False

   Hint

   Consider the materials used in the test.

5. 5.

   A construction site used OPC mortar that showed a compressive strength of only 25 MPa at 28 days. Propose a detailed approach the engineers should take to resolve the issue.

   Hint

   Consider what factors determine the strength outcomes.

6. 6.

   If a new type of cement claims to provide 50 MPa compressive strength at 28 days but fails in testing, discuss how this failure can impact project planning.

   Hint

   Think about the ripple effect of strength in construction.