7.5. Selection Criteria for Aggregates in Pavement Construction

Try these first

1. 1.

   What shape should aggregates ideally be in the surface course?

   Hint

   Think about how they fit together.

2. 2.

   For the sub-base course, what is the maximum allowable abrasion value?

   Hint

   Consider the levels below the base course.

3. 3.

   What is the maximum abrasion value for surface course aggregates?

   • < 30-35%
   • < 40%
   • < 50%

   Hint

   Consider how much wear they will experience.

4. 4.

   Is angular shape preferred for base course aggregates?

   • True
   • False

   Hint

   Think about how they fit together.

5. 5.

   Design a mix for a new roadway that experiences heavy traffic. Outline the aggregate types and properties you would recommend.

   Hint

   Consider the traffic load and weather conditions.

6. 6.

   Discuss potential methods to test aggregates to ensure they meet the specified selection criteria.

   Hint

   Refer back to the section on standard tests covered.