2.11. Subgrade Reaction Modulus (k-value)

Try these first

1. 1.

   What does the k-value represent in pavement design?

   Hint

   Think about how well it supports loads.

2. 2.

   Which test is used to determine the k-value?

   Hint

   Consider the name that involves loading a plate.

3. 3.

   What is the k-value used to measure in pavement structures?

   • Settlement
   • Load intensity
   • Subgrade stiffness

   Hint

   Consider what stiffness relates to in materials.

4. 4.

   The Plate Load Test is essential for determining which of the following?

   • True
   • False

   Hint

   Think about the importance of testing for design purposes.

5. 5.

   A circular plate of diameter 30 inches is loaded with 4000 lbs. If the settlement measured is 0.4 inches, calculate the k-value and discuss what this indicates about the subgrade.

   Hint

   Remember to calculate the area of the plate first.

6. 6.

   Discuss the impacts of frost and moisture variations on the k-value over time. What engineering practices could mitigate potential decreases in k-value?

   Hint

   Think about how environmental factors affect soil behavior.