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COMPORTEMENT THERMOMÉCANIQUE DES ENROBÉS BITUMINEUX À BASSES TEMPÉRATURES. Relations entre les propriétés du liant et de l'enrobé

Abstract : This thesis has been realized within the framework of a partnership between the Ecole Nationale des TPE, APPIA and EUROVIA. The company Total has also been associated to this project. The study deals with the thermo-mechanical behavior of bituminous materials at low temperatures. The aim is to establish the links between the characteristics of the binder and the properties of bituminous mixes at low temperatures, and to better understand the existing low-temperature parameters and criteria for binders (or to propose new ones), related to the in-situ behavior of bituminous mixtures. A large experimental campaign has been carried out so as to fulfill this goal.

After a bibliographical study on the rheology and the thermo-mechanical properties of (pure or modified) binders, mastics and mixes, the experimental campaign carried out both in the small strain domain and in the large strain domain, is presented.

The low temperature behavior of binders has been evaluated with three common fundamental tests : i)the complex modulus determination, ii)the Bending Beam Rheometer and iii)the tensile strength at a constant strain rate and constant temperatures. A new three point bending test on pre-notched bitumen beams has also been developed at the ENTPE. The low-temperature fracture properties of bitumens were studied at constant temperatures and crosshead speeds considering the Linear Elastic Fracture Mechanics (LEFM) assumptions.

The thermo-mechanical behavior of bituminous mixtures has been studied by performing i)complex modulus tests, ii)measurements of the coefficient of thermal dilatation and contraction, iii)tensile tests at constant temperatures and strain rates, and iv)Thermal Stress Restrained Specimen Tests.

Apart from the determination of some pertinent links between binder and mix properties and discriminating characteristics with regard to the thermal cracking of bituminous mixes at low temperatures, the analysis has also consisted in modeling the behavior of bituminous binders and mixes, both in the small strain domain and in the large strain domain.

A unique rheological model has been developed for the modeling of linear viscoelastic properties of both bituminous binders and mixes. This model, called the “2S2P1D” model, consists of a generalization of the Huet-Sayegh analogical model. Finally, from our results, a transformation that is independent of the introduced model allows to predict easily and efficiently the mix complex modulus from the binder one.

Eventually, in the last part of this work, the thermo-viscoplastic law “DBN” (Di Benedetto-Neifar), developed at the ENTPE for bituminous mixes, is presented. This law introduces the various experimental observations : a general linear viscoelastic behavior in the small strain range, non-linearity and viscoplastic flow. The effect of the temperature is described as well for small strain levels, where time-temperature superposition principle is applied, as for larger strain levels. A computer program has been developed on the Visual Basic interface of MS Excel. Numerical simulations of direct tensile test are carried out. Finally, TSRST simulations are presented in order to show the influence of non-linearity on the thermal stress evolution induced by monotonic or cyclic temperature variation.
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Contributor : François Olard <>
Submitted on : Monday, May 10, 2004 - 6:24:26 PM
Last modification on : Wednesday, November 20, 2019 - 7:43:42 AM
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François Olard. COMPORTEMENT THERMOMÉCANIQUE DES ENROBÉS BITUMINEUX À BASSES TEMPÉRATURES. Relations entre les propriétés du liant et de l'enrobé. Mécanique [physics.med-ph]. INSA de Lyon, 2003. Français. ⟨tel-00006050⟩

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