Modeling the DSR complex shear modulus of asphalt binder using 3D discrete element approach

The results, obtained comparing the numerical simulation of a frequency sweep test with a laboratory one, show that the adopted approach is found to be successful in predicting, both quantitatively and qualitatively, the complex modulus and the phase angle of the studied polymer modified bitumen, over a wide range of temperatures and frequencies. In addition the microstructural analysis has permitted to evaluate the internal forces configuration induced by shear stress in the specimen.