7.4.5. Aggregate Proportions

Try these first

1. 1.

   What is the typical range for the size of coarse aggregates in HPC?

   Hint

   Refer to the guidelines on aggregate sizing.

2. 2.

   What is the role of fine aggregates in concrete?

   Hint

   Think about how fine aggregates complement the coarse ones.

3. 3.

   What is the recommended size range for coarse aggregates in HPC?

   • 5-10 mm
   • 10-20 mm
   • 20-30 mm

   Hint

   Look for the guidelines on aggregate selection.

4. 4.

   True or False: Continuous grading helps increase voids in a concrete mix.

   • True
   • False

   Hint

   Consider the definition of continuous grading.

5. 5.

   If you have a concrete mix of 12 m³ and you aim to use coarse aggregates at 45%, how much volume of coarse aggregates will you require?

   Hint

   Multiply the mix volume by the proportion you're targeting.

6. 6.

   Design a concrete mix considering that less than 10% of coarse aggregate could lead to a failed mix. Given a total volume of 15 m³, what’s the minimum volume of coarse aggregate needed?

   Hint

   Calculate 10% of the total volume to find the minimum needed.