26.3. Determine the properties of the mix

Try these first

1. 1.

   Define Theoretical Specific Gravity (Gt).

   Hint

   Consider what elements are included in this measurement.

2. 2.

   What does Vb represent?

   Hint

   Think about the materials involved in the mix.

3. 3.

   What does the theoretical specific gravity (Gt) measure?

   • Only the weight of bitumen
   • Density excluding air voids
   • Air voids percentage

   Hint

   Focus on what 'theoretical' refers to.

4. 4.

   True or False: The bulk specific gravity (Gm) includes air voids in its measurement.

   • True
   • False

   Hint

   Think about how density is impacted by air.

5. 5.

   Calculate the Gt, Gm, and Vv for a specimen with the following data: W1=500g, G1=2.5, W2=300g, G2=2.6, Wb=200g, Gb=1.0, with the specimen weight in air as 1500g and in water as 1200g.

   Hint

   Verify the input values and calculations step by step.

6. 6.

   Discuss how increasing the percent air voids (Vv) can affect the long-term performance of asphalt mixes.

   Hint

   Think about what happens when there are too many air pockets in materials exposed to heavy loads.