28.10. Summary

Try these first

1. 1.

   What does CBR stand for?

   Hint

   Think about soil strength measures.

2. 2.

   What is the purpose of the vehicle damage factor?

   Hint

   Focus on how vehicles affect roads.

3. 3.

   What does the CBR value indicate?

   • Soil moisture content
   • Subgrade strength
   • Traffic volume

   Hint

   Think of what CBR is used for in road design.

4. 4.

   True or False: A higher vehicle damage factor indicates that lighter vehicles are on the road.

   • True
   • False

   Hint

   Reflect on the definition of VDF.

5. 5.

   Create a pavement design for a new route expected to carry 10 msa using a CBR of 6%. Specify layer thicknesses based on standard IRC guidelines.

   Hint

   Use the design charts to find correlations.

6. 6.

   If a road initially designed for 5 msa sees growth to 12 msa due to unexpected urban development over the same design life, what considerations must be addressed in the original design?

   Hint

   How would additional loads affect material types?