Viscoelastic characterisation of asphalt concrete under different loading conditions
Por:
Hernandez-Fernandez, Noe, Ossa-Lopez, Alexandra, Harvey, John T.
Publicada:
19 sep 2022
Ahead of Print:
1 may 2021
Resumen:
Asphalt concrete (AC) is a composite material that exhibits time and
temperature-dependent properties, and it is generally accepted that AC
behaves as a linear viscoelastic solid at small strain levels.
Nevertheless, different mechanisms and the damage evolution can change
its behaviour from the linear viscoelasticity. This study was focused on
identifying the causes of the deviation of AC viscoelastic properties
under different loading conditions and at small strain levels during
complex modulus tests. Sinusoidal tension-compression and compression
tests on six asphalt mixtures produced with the same aggregate gradation
but different asphalt binders under stress- and strain-controlled
conditions were performed within a defined range of frequencies and
temperatures. It was found that aggregate interaction and energy
dissipation characteristics were the main mechanisms that influenced
deviations in the viscoelastic properties, but they were only
significant at high temperatures and during considerable nonrecoverable
accumulated deformation.
Filiaciones:
Hernandez-Fernandez, Noe:
Univ Nacl Autonoma Mexico, Inst Ingn, Mexico City, DF, Mexico
Ossa-Lopez, Alexandra:
Univ Nacl Autonoma Mexico, Inst Ingn, Mexico City, DF, Mexico
Harvey, John T.:
Univ Calif Davis, Univ Calif Pavement Res Ctr, Davis, CA 95616 USA
|