11.13. Tests on Bituminous Cutbacks

Try these first

1. 1.

   What does the distillation test measure?

   Hint

   Think about what happens when the solvent evaporates.

2. 2.

   Why is the penetration test conducted?

   Hint

   What does a needle sinking into bitumen indicate?

3. 3.

   What does the distillation test classify?

   • Type of aggregate
   • Percentage of solvent
   • Ductility level

   Hint

   Remember the test's focus on solvents.

4. 4.

   True or False: A high penetration value indicates a very soft bitumen.

   • True
   • False

   Hint

   Think about what penetration depth means.

5. 5.

   If a distillation test indicates a cutback contains 70% volatile solvent, classify it and explain the implications for its use.

   Hint

   Consider the relation between volatility and curing time.

6. 6.

   Discuss how varying penetration values might influence the choice of bituminous cutback for different climates.

   Hint

   Think about the effects of temperature on material flexibility.