6.5.5. Shape Tests

Try these first

1. 1.

   What does the Flakiness Index measure?

   Hint

   Think about the shape of the particles.

2. 2.

   What is the ideal Flakiness Index for surface courses?

   Hint

   Recall the standard guidelines for road aggregates.

3. 3.

   What does the Flakiness Index measure?

   • The size of aggregates
   • The proportion of flaky particles
   • The overall weight of aggregates

   Hint

   Think about what contributes to the shape of the aggregate.

4. 4.

   True or False: A high Elongation Index indicates better aggregate performance.

   • True
   • False

   Hint

   Recall how shapes fit together in pavement.

5. 5.

   You have two aggregate samples: Sample A with an FI of 10% and EI of 12%, and Sample B with an FI of 20% and EI of 30%. Which sample would you recommend for high-load pavement, and why?

   Hint

   Think about how shapes affect pavement stability.

6. 6.

   Calculate the potential impact on pavement performance if the aggregate’s Flakiness and Elongation Index exceed recommended limits. Discuss possible long-term consequences.

   Hint

   Reflect on the roles of shape in loading situations.