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Advanced Constitutive Modelling of Bituminous Materials

Author(s): Hervé Di Benedetto
Paper category: Proceedings
Book title: Proceedings of the International Conference on Advances in Construction Materials and Systems, Vol. 1
Editor(s): Manu Santhanam, Ravindra Gettu, Radhakrishna G. Pillai, Sunitha K. Nayar
ISBN: 978-2-35158-193-3
e-ISBN: 978-2-35158-191-9
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 39-44
Total Pages: 6
Language : English

Abstract: The keynote lecture introduces and develops some research results, obtained at the University of Lyon/ENTPE, on the 3-dimensional thermomechanical behaviour and modelling of bituminous materials. Behaviour of bituminous materials is complex. Following applied loading, very different types of properties can be observed, such as linear viscoelasticity (LVE) for very small strain amplitudes, nonlinearity for larger strain amplitudes, fatigue or rutting for a great number of applied cycles, brittle or ductile failure can occur, while thixotropy and healing may exist following the considered temperature and loading history. Proposed modeling approach is based on a large amount of experimental data obtained the last two decades at the University of Lyon/ENTPE laboratory. First the linear viscoelastic (LVE) behaviour observed in the “small” strain domain for “small” number of cycles is investigated. The global LVE behaviour is modelled with the developed 2S2P1D (2 springs, 2 parabolic creep [also called fractional derivative] and 1 dashpot elements) rheological model. 2S2P1D model, which is a continuous spectrum model, is used for the calibration of LVE discrete GKV (Generalized Kelvin Voigt) model(s) obtained as asymptotic expression of the nonlinear DBN model proposed by the author’s team for bituminous mixtures (Figure 1). DBN model is rather general and versatile. It can describe, using the same formalism, different types of mixtures behaviour such as linear viscoelasticity, nonlinearity, fatigue or rutting. It is shown how LVE properties of mixtures can be obtained from binder ones (and reciprocal) considering the proposed so called SHStS (Shift, Homothety, Shift and time Shift) transformation in the complex plane (Figure 2) that does not need any model. The time temperature superposition principle property is considered for the different types of behaviour. The validity of this principle is confirmed in the 3-dimensional case by the experimental investigations as well in the linear than the nonlinear domains. This principle was also confirmed by experiments considering waves propagations and even data from crack propagation tests. Some comparison between data and modeling are presented to validate proposed developments. Examples in the linear domain are given in Figures 3 to 5.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00

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