22.5. Problems

Try these first

1. 1.

   What is aggregate?

   Hint

   Think about materials used in construction.

2. 2.

   Name one property that aggregates need to have.

   Hint

   Consider what allows them to withstand loads.

3. 3.

   What is the primary purpose of the crushing test?

   • To measure hardness
   • To assess strength
   • To determine shape

   Hint

   Think about what lives at the base of the pavement.

4. 4.

   True or False: Clean aggregates have no impact on adhesion with bitumen.

   • True
   • False

   Hint

   Think about what happens when moisture is present.

5. 5.

   Given an aggregate with a crushing strength of 35%, determine if it is suitable for use in a highly trafficked road layer.

   Hint

   Refer back to the limits we've discussed.

6. 6.

   If an aggregate has a high water absorption rate, what precautions would you recommend before its use?

   Hint

   Consider the impact of water on adhesion.