17.2.3. Subgrade and Sub-base Conditions

Try these first

1. 1.

   What is the primary role of the subgrade in pavement design?

   Hint

   Think about what lies underneath the pavement.

2. 2.

   Why is good drainage quality important for the subgrade?

   Hint

   Consider how water impacts soil strength.

3. 3.

   What is the main function of the subgrade in pavement construction?

   • A) Provide insulation
   • B) Support pavement structure
   • C) Allow for aesthetic finishes

   Hint

   Remember, it's what the pavement rests upon.

4. 4.

   True or False: A weak subgrade can result in pavement cracks over time.

   • True
   • False

   Hint

   Consider the relationship between strength and support.

5. 5.

   Evaluate a case where a highway pavement consistently shows cracking in a region with high rainfall. What role do subgrade and drainage likely play?

   Hint

   Consider the effects of water on material integrity.

6. 6.

   Design a minor test to evaluate the stiffness of a proposed subgrade material for a new pavement project.

   Hint

   Think about standardized tests in engineering.