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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 104
PROCEEDINGS OF THE SECOND INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE
Edited by: J. Pombo
Paper 225

Linear Thermo-Viscoelastic Behaviour of Bituminous Mixtures used for Railway Trackbeds

D. Ramirez Cardona1,2, H. Di Benedetto2, C. Sauzeat2, Q.T. Nguyen2, N. Calon1 and A. Robinet1

1Direction of Engineering, SNCF, Saint-Denis, France
2Laboratory of Civil Engineering and Building, Laboratory of Tribology and System Dynamics, University of Lyon, France

Full Bibliographic Reference for this paper
D. Ramirez Cardona, H. Di Benedetto, C. Sauzeat, Q.T. Nguyen, N. Calon, A. Robinet, "Linear Thermo-Viscoelastic Behaviour of Bituminous Mixtures used for Railway Trackbeds", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 225, 2014. doi:10.4203/ccp.104.225
Keywords: bituminous mixture, bituminous sub-ballast layer, viscoelastic behaviour, thermo-mechanical properties, complex modulus test, viscoelastic constitutive model, railway trackbed.

Summary
This paper presents a characterization of the linear thermo-viscoelastic behaviour of asphalt mixtures used in railway infrastructure. The existing models and tests for bituminous mixtures are mostly conceived for the road industry and need to be validated for railway applications. An improved 3D complex modulus test campaign was carried out on a road base bituminous mixture (GB type) used for railway subballast layer. The tests were performed on cylindrical asphalt specimens submitted to sinusoidal tension-compression loading at different frequency levels and temperatures. Linear viscoelastic modelling of the material using a 3Dimensional constitutive model, called 2S2P1D (2 Springs, 2 Parabolic, 1 Dashpot), is proposed. This model was developed in the Laboratory of Civil Engineering and Construction (LGCB) of the ENTPE, University of Lyon. The material's complex modulus and Poisson's ratio master curves are presented. The model shows to be successful in predicting the viscoelastic rheological properties of the material.

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