24.2.3. Types of mix

Try these first

1. 1.

   What is a well-graded mix?

   Hint

   Think about the aggregates used in the mixture.

2. 2.

   Identify an advantage of an open-graded mix.

   Hint

   Consider the surface characteristics of the mix.

3. 3.

   What defines a well-graded mix?

   • A mix with no fines
   • A mix with a balanced proportion of all aggregates
   • A mix that is only coarse aggregates

   Hint

   Think about the structure of the mix.

4. 4.

   True or False: Open-graded mixes have high compressive strength.

   • True
   • False

   Hint

   Consider the composition of open-graded mixes.

5. 5.

   Design a road using each type of mix discussed and explain the rationale behind your choices.

   Hint

   Consider the application environment and the expected loads.

6. 6.

   Evaluate the potential failures associated with using a gap-graded mix in an area with heavy traffic.

   Hint

   Think about the types of stress that a mix might endure.