25.1. Overview

Try these first

1. 1.

   Define aggregate in the context of dry mix design.

   Hint

   Think about what materials are combined in concrete or asphalt.

2. 2.

   What does gradation refer to?

   Hint

   Focus on how sizes relate in the mixture.

3. 3.

   What is the main goal of dry mix design?

   • To increase aggregate size
   • To achieve maximum density
   • To minimize aggregate use

   Hint

   Consider why density is important in pavements.

4. 4.

   True or False: Fine aggregates are crucial for interlocking.

   • True
   • False

   Hint

   Reflect on the roles of different types of aggregates.

5. 5.

   Given a set of aggregates with known properties, determine the best combination for a dense bituminous mix based on provided performance metrics.

   Hint

   Review the principles of aggregate interaction and stability.

6. 6.

   Design a mix that adheres to Fuller’s Law using specific sizes provided and clarify how to adjust proportions for operational constraints.

   Hint

   Think about how aggregate shapes influence gradation.