9.1.1. Chemical Composition

Try these first

1. 1.

   What is the primary role of asphaltenes in bitumen?

   Hint

   Think about what makes the material hard.

2. 2.

   What do resins contribute to bitumen?

   Hint

   How does bitumen bond with aggregates?

3. 3.

   Which component of bitumen contributes to its stiffness?

   • Asphaltenes
   • Resins
   • Aromatics

   Hint

   Consider which part adds the most strength.

4. 4.

   True or False: Resins help improve the flow characteristics of bitumen.

   • True
   • False

   Hint

   What is the main function of resins?

5. 5.

   Analyze how altering the proportion of asphaltenes to resins might affect the cold-weather performance of bitumen.

   Hint

   Consider the trade-offs between flexibility and durability.

6. 6.

   Propose a bitumen composition for a high-temperature environment and justify your selection based on chemical properties.

   Hint

   Think about how hot environments change material characteristics.