25.2. Selection of aggregates

Try these first

1. 1.

   What are the three types of aggregates used in bituminous mixtures?

   Hint

   Think about the size differences among aggregates.

2. 2.

   Define fine aggregates.

   Hint

   What is the role of these small aggregates?

3. 3.

   What is the primary role of coarse aggregates in bituminous mixtures?

   • Provide aesthetic value
   • Enhance the flexibility of the mixture
   • Contribute to stability through interlocking

   Hint

   Think about how bigger particles fit together.

4. 4.

   True or False: Crushed aggregates provide lower stability compared to rounded aggregates.

   • True
   • False

   Hint

   Remember the properties of each type of aggregate.

5. 5.

   Discuss the impact of aggregate shape on the performance of a bituminous mixture. Provide examples of different shapes and their respective effects.

   Hint

   Consider what happens when pieces fit closely together.

6. 6.

   Devise a strategy to select aggregates for a high-stability bituminous mixture. What criteria will you prioritize?

   Hint

   Think about how each type of aggregate can contribute to the mix.