4.3.2.5. Resilient Modulus (MR) Test

Try these first

1. 1.

   What does the Resilient Modulus measure?

   Hint

   Think about what happens when you press a sponge repeatedly.

2. 2.

   Why is MR important in pavement design?

   Hint

   Consider how pavement needs to withstand traffic.

3. 3.

   What is the main purpose of the Resilient Modulus test?

   • To evaluate soil liquidity
   • To measure soil's elastic response under repeated loading
   • To determine soil's cohesion

   Hint

   Think about what elasticity means in materials.

4. 4.

   True or False: Higher MR values typically indicate the need for thicker pavement structures.

   • True
   • False

   Hint

   What happens if the soil is stronger?

5. 5.

   A laboratory conducted an MR test on a soil sample, yielding an MR value of 120 MPa. If another sample has an MR of 200 MPa, how might the pavement design differ between these two samples? What factors may contribute to this difference?

   Hint

   Consider the characteristics of the two soil samples.

6. 6.

   If engineering standards require a minimum MR of 150 MPa for certain pavement, how would you approach the design if the tested soil shows only 100 MPa? What improvements would you consider?

   Hint

   Think about methods discussed in the chapter for improving soil strength.