22.2.3. Toughness

Try these first

1. 1.

   Define toughness in aggregates.

   Hint

   Think about what happens to rocks when hit hard.

2. 2.

   What test is used to measure toughness?

   Hint

   The name of this test includes the word 'impact'.

3. 3.

   What does toughness in aggregates refer to?

   • A) Flexibility
   • B) Impact resistance
   • C) Absorption

   Hint

   Remember the context of vehicle impacts.

4. 4.

   True or False: Tough aggregates are necessary for safer pavements.

   • True
   • False

   Hint

   Think about the road condition under traffic loads.

5. 5.

   You are tasked with selecting materials for a new highway that will experience heavy truck traffic. Discuss your decision-making process considering aggregate toughness.

   Hint

   Consider the impact of trucks over time.

6. 6.

   Detail the consequences of using low-toughness aggregates in residential areas versus highways.

   Hint

   Reflect on the difference in traffic and wear.