Article Dans Une Revue Road Materials and Pavement Design Année : 2025

Towards a better rheological investigation of the oxidative aging of bituminous mixes: Frequency versus time characterization

Résumé

Aging is among the most common causes of bituminous pavement hardening and engenders premature degradation. The aim of this study is to assess the effect of laboratory aging on the linear viscoelastic properties of bituminous mixes, based on a time and frequency domain characterization, and physicochemical assessment of bituminous concretes and bitumen specimens. It also establishes relationships between the various methods employed. To this end, three thermo-oxidative aging durations (0, 4 and 9 days) have been considered. To simulate the long-term thermo-oxidative aging of binders, RTFOT and PAV tests were conducted on fresh bitumen, followed by physicochemical characterizations (FTIR and asphaltene content) over different aging periods. Tensile creep-recovery and complex modulus tests were also performed to characterize aged and unaged bituminous mixes, in the time and frequency domain respectively. The evolution of axial strain in creep-recovery tests was simulated using calibrated data from the Huet-Sayegh and Generalized Maxwell models in relying on the complex modulus of bituminous concretes and the inverse Laplace transform to switch from the complex to the time domain. These findings show that the stiffness moduli of mixes increase with the duration of long-term thermo-oxidative aging. A number of rheological parameters (R-value, Ec) of bituminous mixes and binders were correlated with aging durations and indices. The evolution of axial strain under creep-recovery conditions provides an instructive relationship between steady-state creep viscosity η0 and physicochemical parameters, as reflected by a decrease in creep compliance with aging duration and a strong correlation between η0 and the combined aging index ICO + ISO for all tested temperatures.

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hal-05034495 , version 1 (16-04-2025)

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Abderrahim Achchoubi, Sâannibè Ciryle Somé, Ferhat Hammoum, Virginie Mouillet, Jean-François Barthélémy. Towards a better rheological investigation of the oxidative aging of bituminous mixes: Frequency versus time characterization. Road Materials and Pavement Design, 2025, pp.1-30. ⟨10.1080/14680629.2025.2473964⟩. ⟨hal-05034495⟩
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