14.4.2.3. Gradation Control

Try these first

1. 1.

   Define gradation control in your own words.

   Hint

   Think about how different sizes of materials fit together.

2. 2.

   What is interlock in the context of pavement materials?

   Hint

   Think of how puzzle pieces fit together.

3. 3.

   What is the main goal of gradation control in bituminous mixes?

   • To reduce costs
   • To enhance durability and performance
   • To increase binder usage

   Hint

   Think about why we want strong, long-lasting pavements.

4. 4.

   True or False: Poor gradation can lead to increased air voids in the pavement.

   • True
   • False

   Hint

   Consider the relationship between packing and voids.

5. 5.

   Imagine you are responsible for designing a bituminous pavement for a city with heavy rainfall. Discuss how you would choose the gradation of your aggregate mix and justify your choices.

   Hint

   Consider local weather impacts and how they affect pavement materials.

6. 6.

   You are analyzing a pavement failure case. Given that the failure is attributed to poor aggregate gradation, suggest a testing and remedy approach.

   Hint

   Think about standard lab tests for asphalt mixes.