2.9.3. CBR and Pavement Design

Try these first

1. 1.

   What does CBR stand for?

   Hint

   Think about what the test measures.

2. 2.

   Is a higher CBR value better for subgrade strength?

   Hint

   Recall what high values signify about soil performance.

3. 3.

   What is the primary purpose of the CBR test?

   • To measure soil moisture content
   • To determine the soil's load-carrying capacity
   • To assess soil permeability

   Hint

   Remember what CBR indicates about soil strength.

4. 4.

   True or False: A higher CBR value indicates weaker subgrade.

   • True
   • False

   Hint

   Think about the purpose of the CBR test.

5. 5.

   Given a project with existing subgrade having varied CBR values (5, 10, and 15), discuss the implications on pavement design and how you would approach material selection.

   Hint

   Consider how each value informs potential construction techniques.

6. 6.

   If a test site shows a CBR value of 3, what engineering interventions might you suggest to improve soil conditions for future pavement support?

   Hint

   Think about methods commonly used to strengthen weak soils.