4.3.1.1. California Bearing Ratio (CBR) Test

Try these first

1. 1.

   What does the acronym CBR stand for?

   Hint

   Think of the test's full name.

2. 2.

   What is the purpose of the CBR Test?

   Hint

   Consider what this test evaluates regarding soil strength.

3. 3.

   What does the CBR Test evaluate?

   • Soil moisture content
   • Load-bearing capacity of soil
   • Traffic volume

   Hint

   Think about the main function of the CBR Test.

4. 4.

   True or False: A higher CBR value means a need for thicker pavement.

   • True
   • False

   Hint

   Consider the relationship between strength and thickness.

5. 5.

   A construction project requires a pavement structure suitable for high traffic volumes. The subgrade has a CBR value of 5%. What recommendations can be made for the pavement design?

   Hint

   Consider what a low CBR value necessitates in terms of design.

6. 6.

   You are given a project with various soil samples. Sample A has a CBR value of 10%, Sample B has 20%. How would the pavement specifications differ for each sample?

   Hint

   What is the direct relationship between CBR values and pavement design choices?