24.2.1. Objectives of mix design

Try these first

1. 1.

   What is the main objective of incorporating sufficient bitumen in a bituminous mix design?

   Hint

   Think about the lifespan of the pavement.

2. 2.

   How do air voids benefit a compacted asphalt mix?

   Hint

   Consider what happens after the traffic applies pressure.

3. 3.

   What is one of the main objectives of suggesting sufficient bitumen in a mix?

   • To provide color
   • For durability
   • For weight

   Hint

   Think about what keeps a road surface intact.

4. 4.

   True or false: Adequate air voids enhance compaction in bituminous mixes.

   • True
   • False

   Hint

   Consider what happens during the mixing and application process.

5. 5.

   In a hypothetical scenario, a roadway coated with a bituminous mix has exhibited signs of cracking. Analyze how the objectives of mix design may have been overlooked and the potential consequences.

   Hint

   Recall which specific mix design objectives could influence cracking.

6. 6.

   Consider the effects of increased traffic loads on a pavement designed with insufficient shear strength. Predict the possible longevity of the pavement and suggest improvements you would make.

   Hint

   Think about how the characteristics of the mix interact with load conditions.