26.8. Numerical example - 1

Try these first

1. 1.

   What is the formula for calculating Theoretical Specific Gravity (G_t)?

   Hint

   Remember, this involves the total weight and specific gravities of all components.

2. 2.

   What does VFB stand for?

   Hint

   Think about how much of the void space is occupied by bitumen.

3. 3.

   What does G_t represent in Marshall Mix Design?

   • A measure of air voids
   • Theoretical specific gravity
   • Bulk specific gravity

   Hint

   It’s the gravity that relates to the mixture's theoretical density.

4. 4.

   True or False: G_m includes the air voids in the mixture.

   • True
   • False

   Hint

   Think about how G_m differs from G_t.

5. 5.

   Given the specific gravities 2.65 for coarse aggregate, 2.50 for fine aggregate, and 1.03 for bitumen; what would be the G_t for a mix with weights 900g, 1300g, 150g?

   Hint

   Make sure to check your weights against specific gravities.

6. 6.

   In a mix with 30% air voids and the volume of bitumen calculated as 18%, what is the VMA?

   Hint

   Just a simple addition to find total voids.