26.3.6. Voids filled with bitumen VFB

Try these first

1. 1.

   Define Voids Filled with Bitumen (VFB).

   Hint

   Think about how much space bitumen occupies in aggregates.

2. 2.

   What is the formula to calculate VFB?

   Hint

   Look for what Vb and VMA represent.

3. 3.

   What does VFB stand for?

   • Volume Filled by Bitumen
   • Voids Filled with Bitumen
   • Volume of Bitumen Filled

   Hint

   Focus on what VFB directly refers to in mix design.

4. 4.

   True or False: A higher VFB percentage indicates better performance.

   • True
   • False

   Hint

   Consider the balance needed in asphalt mixes.

5. 5.

   If a mix has a Vb of 22% and a VMA of 25%, calculate VFB and explain what a VFB of 88% implies for the performance of this mix.

   Hint

   Consider the balance between bitumen volume and aggregate structure.

6. 6.

   Discuss the implications if a project's VFB is found to be consistently below 70%. What corrective actions might be recommended?

   Hint

   Think about how changes to the mix can influence VFB calculations.