22. Pavement materials: Aggregates

Try these first

1. 1.

   What are aggregates?

   Hint

   Think about what materials make up pavements.

2. 2.

   Name a common test for evaluating aggregate strength.

   Hint

   Consider tests that measure how well materials hold up under pressure.

3. 3.

   Which of the following tests determines the crushing strength of aggregates?

   • Los Angeles Abrasion Test
   • Crushing Test
   • Impact Test

   Hint

   What test would you use to find out how much weight aggregates can handle?

4. 4.

   True or False: Aggregates account for a lower percentage of Portland cement concrete than bituminous concrete.

   • True
   • False

   Hint

   Think about the percentages given in the overview.

5. 5.

   A new pavement design requires high durability and strength. Based on the properties of aggregates discussed, which types of aggregates would you recommend and why?

   Hint

   Think about aggregates' natural properties discussed.

6. 6.

   If an aggregate fails a crushing test, what implications might this have on pavement longevity and safety?

   Hint

   Consider the role of strength under heavy loads.