6.5.4. Compressive Strength Test

Try these first

1. 1.

   What is the minimum required strength a concrete cube made with test water should achieve?

   Hint

   Think about the comparison with distilled water.

2. 2.

   What does curing mean in concrete preparation?

   Hint

   It helps concrete gain its strength.

3. 3.

   What is the purpose of the Compressive Strength Test?

   • To determine the water quality
   • To evaluate the strength of concrete
   • To test for impurities in water

   Hint

   Consider what aspect of concrete the test directly measures.

4. 4.

   True or False: Concrete should achieve 100% of the strength of distilled water mixes.

   • True
   • False

   Hint

   Look back at what percentage we discussed for the test.

5. 5.

   A construction team is considering using water from a nearby lake known for high organic content. They conduct a compressive strength test but find their concrete only reaches 70% of the distilled water strength. Discuss the potential impacts and what actions the team should take.

   Hint

   Evaluate the risks of using contaminated water.

6. 6.

   If a concrete mix using test water yields a compressive strength of 30 MPa after 7 days, what can be inferred about the strength of the mix made with distilled water? Calculate the minimum acceptable strength.

   Hint

   Apply the 90% rule we discussed for compressive strength.