7.3.4. Water-Binder Ratio

Try these first

1. 1.

   What is the typical water-binder ratio range for high performance concrete?

   Hint

   Think about how much water is generally needed for the strength of HPC.

2. 2.

   Why is the water-binder ratio important?

   Hint

   Consider what happens to concrete’s properties if too much water is added.

3. 3.

   What is the ideal water-binder ratio range for high performance concrete?

   • 0.15 - 0.25
   • 0.25 - 0.35
   • 0.35 - 0.45

   Hint

   Recall the figures we discussed in class regarding w/b ratios.

4. 4.

   True or False: A lower water-binder ratio always leads to higher workability.

   • True
   • False

   Hint

   Think of the mixing challenges faced with lower water content.

5. 5.

   Given a specific construction project with high exposure to chlorides, explain how you would determine the appropriate water-binder ratio.

   Hint

   Reflect on how environmental agents affect concrete performance.

6. 6.

   A civil engineer proposes to use a w/b ratio of 0.20 for an HPC mix. What considerations should they keep in mind regarding workability?

   Hint

   Think about how low w/b ratios change the flow properties of concrete.