1.7. Calculation

Try these first

1. 1.

   What is the formula for calculating compressive strength?

   Hint

   Think about the maximum force divided by the area it acts upon.

2. 2.

   What are the units for measuring compressive strength?

   Hint

   Recall conversion; 1 MPa is equal to how many N/mm²?

3. 3.

   What does the compressive strength of concrete primarily assess?

   • Flexural strength
   • Crack resistance
   • Load-bearing capacity

   Hint

   Identify what is measured while under load.

4. 4.

   True or False: The formula for compressive strength is P around A.

   • True
   • False

   Hint

   Remember the order of operations in arithmetic.

5. 5.

   A batch of concrete tested under a controlled environment yielded a maximum load of 800 kN with a cube measurement of 300 mm x 300 mm. Calculate the compressive strength and discuss what influences would affect this result.

   Hint

   Ensure to convert kN into N to use this in the formula.

6. 6.

   In a compressive strength test, samples yield varying results. One shows 30 MPa, another 25 MPa. Discuss how erroneous curing could lead to such discrepancies.

   Hint

   Consider how hydration dynamics might vary across different specimens.