9.1.1. Compressive Strength

Try these first

1. 1.

   Define compressive strength in concrete.

   Hint

   Think about what happens when concrete is pushed vertically.

2. 2.

   What is a common standard test to measure compressive strength?

   Hint

   This test uses what shape for the concrete sample?

3. 3.

   What is the term for the resistance of concrete to axial loads?

   • a) Tensile Strength
   • b) Compressive Strength
   • c) Flexural Strength

   Hint

   Remember the main strength criteria for concrete.

4. 4.

   True or False: A lower water-cement ratio tends to decrease the compressive strength of concrete.

   • True
   • False

   Hint

   Consider how water affects concrete density.

5. 5.

   If a concrete mix is designed with a water-cement ratio of 0.6, what would be the expected implications on its compressive strength compared to a design with a ratio of 0.4? Calculate the potential percentage difference if compressive strength at 0.4 is known to be 40 MPa.

   Hint

   Refer to the impact of water-cement ratio discussed earlier.

6. 6.

   You are tasked with designing a new concrete mix for a high-rise building that requires a minimum compressive strength of 80 MPa. Discuss the steps and considerations you would take in preparing this mix, including material selection and testing methods.

   Hint

   Think about how factors talked about earlier can help enhance strength while meeting design criteria.