3. Water

Try these first

1. 1.

   What is the function of water in concrete?

   Hint

   Think about what happens when you mix cement and water.

2. 2.

   What should the pH level be for mixing water?

   Hint

   Recall the purity standards for concrete mixing.

3. 3.

   What is the primary function of water in concrete?

   • Mixing aggregates
   • Hydration
   • Adding color

   Hint

   Focus on what makes concrete strong.

4. 4.

   True or False: Water with high salt concentration can be used to mix concrete.

   • True
   • False

   Hint

   Recall the quality standards for mixing water.

5. 5.

   A construction project requires a concrete mix with a compressive strength of at least 30 MPa. The selected cement type has a recommended water-cement ratio of 0.5. How much water should be used with 300 kg of cement?

   Hint

   Multiply cement weight by the w/c ratio.

6. 6.

   Describe how you would adjust the water-cement ratio for a concrete mix designed for a hot climate. What would be the considerations?

   Hint

   Think about temperature effects on water evaporation.