24.3.6. Desirable properties

Try these first

1. 1.

   What is the main purpose of ensuring stability in a bituminous mix?

   Hint

   Think about what happens when heavy vehicles apply pressure on a road.

2. 2.

   Define the term 'bitumen content.'

   Hint

   Consider the role of bitumen in mixing.

3. 3.

   What is the purpose of voids in a bituminous mix?

   • For aesthetic reasons
   • To allow for compaction
   • To bind aggregates

   Hint

   Think about what happens when roads are used over time.

4. 4.

   True or False: Bitumen content is not related to the durability of the mix.

   • True
   • False

   Hint

   Consider how bitumen works in the mix.

5. 5.

   You are tasked with designing a bituminous mix for a busy urban street in a cold climate. Detail the properties you would prioritize, and justify your choices.

   Hint

   Think about traffic loads and environmental conditions.

6. 6.

   Given a scenario where the bitumen content is too high, describe the likely effects on the mix performance and suggest remedies.

   Hint

   Consider how balance in the mix affects its integrity.