As you know, resilient modulus is defined as the ratio between the difference between the maximum and the minimum cyclic deviator stress, ∆𝑞𝑐𝑦𝑐, and the recoverable strain, 𝜀1𝑟, during a load cycle. On the other hand, the shear modulus is determined in the shear strain-shear stress plane. I think both will give the same type of result. So, why do researchers use these two parameters? What is the principal significance behind this? Could you kindly help me to understand this? Also, please provide me with your points if I am wrong. Thanks a lot in advance for your kind help.
Dear Mr. Towhid ,
In simple terms, resilient modulus measures the material stiffness of subgrade in pavement. However, dynamic modulus test provides a better characterization of HMA than the resilient modulus due to efficiency in error rectification.
Resilient Modulus (Mr) is a fundamental material property used to characterize unbound pavement materials. It is a measure of material stiffness and provides a mean to analyze stiffness of materials under different conditions, such as moisture, density and stress level. Beside, the dynamic modulus (E), is one of the most critical parameters for the Mechanistic Empirical Pavement Design Guide (MEPDG), which is used for flexible pavement design. The dynamic modulus represents the stiffness of the asphalt material when tested in a compressive-type, repeated load test. The dynamic modulus is one of the key parameters used to evaluate both rutting and fatigue cracking distresses in the MEPDG.
Thanks a lot, Shuraik Kader and Sir Armand Augustin Fondjo, for your answer.
Could you kindly let me know if there is any difference between the calculation procedure of resilient modulus, Mr; and dynamic shear modulus, G? As I stated earlier, the resilient modulus is the ratio of cyclic deviatoric stress and resilient strain in one cycle. On the other hand, the shear modulus is the ratio of cyclic shear stress and residual shear strain in one cycle, if I am not wrong. Therefore, my initial thought is that they will provide the same type of ratio. Please see the attached file for your reference. Thanks a lot once again for your precious time.
Sorry, it is not my field of research but I have found a work that may interest you on a concrete asphalt material:
https://espace.curtin.edu.au/bitstream/handle/20.500.11937/21366/203356_135714__41037___12467__Comparison_between_resilient_modulus_and_dynamic_modulus_of_Western_Australian.pdf?sequence=2
- Badges
- Science topic
- Similar topics
- Biological Science
- Molecular Cell Biology
- Culture Cells
- Cell Line