21. Pavement materials: Soil

Try these first

1. 1.

   What is subgrade?

   Hint

   Think about what lies below the pavement surface.

2. 2.

   Name one desirable property of subgrade soil.

   Hint

   Consider what keeps the pavement intact.

3. 3.

   What is the primary function of subgrade soil in pavements?

   • To provide aesthetic appeal
   • To support the pavement structure
   • To store water

   Hint

   Think about what lies beneath the pavement.

4. 4.

   True or False: The CBR test measures the soil's ability to resist penetration by a plunger.

   • True
   • False

   Hint

   Remember what the test specifically evaluates.

5. 5.

   Evaluate the potential impact of using high-permeability soil in a roadway project. Discuss solutions to mitigate related issues.

   Hint

   Consider why water is detrimental to road structures.

6. 6.

   Design a research proposal that aims to compare the performance of different soil types under identical loading conditions using CBR testing.

   Hint

   Focus on testing objectives and how to compare results.