8.3.2. Air Rectification or Oxidation

Try these first

1. 1.

   What does air rectification enhance in bitumen?

   Hint

   Think about what happens physically to bitumen during the process.

2. 2.

   What temperature range is used during the air blowing process?

   Hint

   It is a high temperature for the air blown into the residue.

3. 3.

   What is the primary purpose of the air rectification process in bitumen?

   • To make bitumen lighter
   • To increase viscosity and softening point
   • To reduce costs

   Hint

   Think about what physical characteristics the air blowing improves.

4. 4.

   True or False: Oxidized bitumen is less thermally stable than straight run bitumen.

   • True
   • False

   Hint

   Consider how oxidation affects the properties.

5. 5.

   Propose a new application for oxidized bitumen based on its properties and justify your reasoning.

   Hint

   Consider environments where heat affects materials the most.

6. 6.

   Evaluate the trade-offs between oxidized bitumen and cutback bitumen in terms of usage and performance.

   Hint

   Focus on the differences in physical properties and applications between the two types.