@conference {5790, title = {Non-linear Elastic Behaviour of Unbound Aggregates in FEM representing Railway Transition Zones}, booktitle = {Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance}, year = {2014}, publisher = {Civil-Comp Press}, organization = {Civil-Comp Press}, address = {Ajaccio, France}, author = {Varandas, J.N. and A. Paix{\~a}o and Fortunato, E. and P. Holscher and R. Cal{\c c}ada} }