6.1.3. Toughness

Try these first

1. 1.

   What does toughness in aggregates mean?

   Hint

   Think about what happens to materials under shock.

2. 2.

   What is the test used to measure toughness?

   Hint

   The name of the test starts with A.

3. 3.

   What does toughness in aggregates define?

   • A. Shape of aggregates
   • B. Ability to resist impact
   • C. Size of aggregates

   Hint

   Think about what happens during a collision.

4. 4.

   True or False: The AIV should be greater than 30% for surfacing aggregates.

   • True
   • False

   Hint

   Recall the specified standard we discussed.

5. 5.

   An aggregate has an AIV of 25%. Discuss what this means for its use in road surfacing.

   Hint

   Consider the importance of impact resistance in the long-term performance of the pavement.

6. 6.

   Compare the toughness requirements for aggregates used in highway construction versus city roads.

   Hint

   Think about the differences in traffic between highways and urban areas.