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Titolo
Viscoelasticity modelling of asphalt mastics under permanent deformation through the use of fractional calculus
Autor(es)
Soggetto
Rheology
Permanent deformation
Asphalt mastic
Filler/bitumen
Creep-recovery
Hydrated lime
Fly ash
Clasificación UNESCO
3305.29 Construcción de Carreteras
3321.01 Materiales Asfálticos
Fecha de publicación
2022-04-25
Citación
Lagos-Varas, M., Movilla-Quesada, D., Raposeiras, A. C., Castro-Fresno, D., Muñoz-Cáceres, O., Andrés-Valeri, V. C., & Rodríguez-Esteban, M. A. (2022). Viscoelasticity modelling of asphalt mastics under permanent deformation through the use of fractional calculus. Construction and Building Materials, 329, 127102. doi:10.1016/j.conbuildmat.2022.127102
Resumen
[EN] asphalt bitumens. Asphalt mastics are viscoelastic composite materials widely used in the construction of
pavement layers. The mechanical properties and the influence of the fillers on the filler/bitumen (f/b) matrix is
one of the main areas of current research. In particular, the elastic determination of fillers for mechanical testing
in asphalt mastic is relevant to understand permanent deformation caused by temperature variations caused by
seasonal changes and vehicular traffic loads. In this sense, this research proposes a new methodology for
rheological characterization of the elastic properties of the filler ξ2 and elastic-viscous properties of the asphalt
bitumen, ξ1 and η, respectively, complementing the existing designs of asphalt mixture. The proposed methodology
allows for identification of the influence of non-conventional fillers in the behavior of the asphalt mastic
for the different recovery cycles of the Multiple Stress Creep Recovery (MSCR) and determination of new
rheological parameters for the compression of the recovery phenomena and the elastic capacity of the type of
filler and weight of the base bitumen. The results obtained show a greater adjustment to the experimental curves
in determining the elastic modulus in each cycle for the hydrated lime and fly ash fillers with different filler/
bitumen ratios. In particular, the proposed model for bituminous mastics achieves a strong fit with the experimental
curves by empirically reducing the quadratic error (R2 = 0.99) and managing to differentiate the elastic
capacity ξ2 of each filler and its effect with increasing concentration. For example, it establishes that the Hydrated
lime filler (HL) acquires an average Young’s modulus of 0.005 MPa, being 99.31% more elastic than Fly
ash filler (FA) for a load of 3.2 kPa at a 1.25f/b ratio. In addition, the new model can be used to modify bitumen
properties to design optimized and stronger asphalt mixtures.
Descrizione
Fuente: Construction and Building Materials
URI
ISSN
0950-0618
DOI
10.1016/j.conbuildmat.2022.127102
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