2.10. Resilient Modulus (Mr)

Try these first

1. 1.

   What does the Resilient Modulus (Mr) represent?

   Hint

   Think about how soil behaves under loads.

2. 2.

   Why is Mr used in pavement design?

   Hint

   Consider how traffic affects roads.

3. 3.

   What does Resilient Modulus (Mr) quantify?

   • Static strength
   • Dynamic elastic response
   • Moisture retention

   Hint

   Think about the effects of traffic loads on pavement.

4. 4.

   True or False: CBR is a better indicator of real-life pavement performance than Mr.

   • True
   • False

   Hint

   Consider which measure evaluates dynamic loading better.

5. 5.

   Predict how a 20% increase in traffic load might influence the Resilient Modulus of a soil with initial Mr value of 1200 psi, assuming the soil's elastic properties remain unchanged.

   Hint

   Evaluate the balance of stress and strain.

6. 6.

   A soil tests show Mr values of 800 psi in dry conditions and 650 psi in wet conditions. How should this influence pavement design considerations?

   Hint

   Consider how moisture changes the behavior of soils.