9.4. Grading of Bitumen

Try these first

1. 1.

   What is penetration grade?

   Hint

   Think about needle tests and penetration.

2. 2.

   Name one example of a viscosity grade.

   Hint

   Remember the 'VG' prefix.

3. 3.

   What does a higher penetration grade indicate?

   • Harder bitumen
   • Softer bitumen

   Hint

   Remember the needle penetration test.

4. 4.

   True or False: Viscosity grades categorize bitumen by its softness.

   • True
   • False

   Hint

   Link viscosity to fluidity.

5. 5.

   Consider a project in a region with high temperatures. The team initially selected VG-10 for the pavement and faced issues with deformation. Discuss the impact of choosing a lower viscosity grade.

   Hint

   Analyze the heat effects on material properties.

6. 6.

   A city is experiencing fluctuating weather patterns with extreme variations. What grading would you recommend for new road construction? Justify your choice.

   Hint

   Balance between soft and hard grades for temperature changes.