28.8. Pavement Composition

Try these first

1. 1.

   What material can be used for the sub-base layer?

   Hint

   Think about what materials provide stability.

2. 2.

   What is the minimum thickness required for the base layer for traffic up to 2 msa?

   Hint

   Consider the guidelines for lower traffic loads.

3. 3.

   What is the minimum CBR value required for sub-base materials supporting traffic exceeding 2 msa?

   • 20%
   • 30%
   • 10%

   Hint

   Think about the specific traffic load classifications.

4. 4.

   True or False: The thickness of the base layer for traffic up to 2 msa must be a minimum of 150 mm.

   • True
   • False

   Hint

   Remember the layering specifications.

5. 5.

   Calculate the required thickness for a pavement designed for a new road expected to endure 15 msa traffic. What materials and thicknesses would you specify for each layer?

   Hint

   Reference the guidelines for thicknesses based on traffic volumes.

6. 6.

   Propose a design solution for a flexible pavement in a region with heavy rainfall. Consider materials and their properties for each layer.

   Hint

   Think about how weather can affect the integrity of each layer.