TY - JOUR
T1 - Modeling of the viscoelastic behavior of paving bitumen using fractional derivatives
AU - Di Paola, Mario
AU - Lo Presti, Davide
AU - Pirrotta, Antonina
AU - Celauro, Clara
PY - 2009
Y1 - 2009
N2 - The paving grade bitumen used in the production of asphalt mixtures for roadconstruction is significantly able to affect the in-service performances of flexible roadpavements. It has been proved that, when subjected to loading conditions comparable withmost pavement operating conditions, bituminous binders behave as linear visco-elasticmaterials. The aim of this paper is to propose a model based on fractional differentialequations which is able to describe the behavior of bituminous binders in the linear viscoelasticrange.Shear creep testing and creep recovery testing were carried out over a range of temperaturesand by applying a stress level which makes it possible to maintain the response of the studiedbitumens within the linear visco-elastic region. It is shown that creep tests follow a powerdecay law, rather than an exponential one: it follows that the most appropriate operator fordescribing the constitutive law for bitumen is a fractional operator. The procedures used todetermine the model’s parameters from the experimental data are discussed.
AB - The paving grade bitumen used in the production of asphalt mixtures for roadconstruction is significantly able to affect the in-service performances of flexible roadpavements. It has been proved that, when subjected to loading conditions comparable withmost pavement operating conditions, bituminous binders behave as linear visco-elasticmaterials. The aim of this paper is to propose a model based on fractional differentialequations which is able to describe the behavior of bituminous binders in the linear viscoelasticrange.Shear creep testing and creep recovery testing were carried out over a range of temperaturesand by applying a stress level which makes it possible to maintain the response of the studiedbitumens within the linear visco-elastic region. It is shown that creep tests follow a powerdecay law, rather than an exponential one: it follows that the most appropriate operator fordescribing the constitutive law for bitumen is a fractional operator. The procedures used todetermine the model’s parameters from the experimental data are discussed.
KW - bitumen
KW - differential derivatives
KW - experimental
testing
KW - fractional viscoelastic model
KW - bitumen
KW - differential derivatives
KW - experimental
testing
KW - fractional viscoelastic model
UR - http://hdl.handle.net/10447/44583
M3 - Article
VL - I
SP - 38
EP - 51
JO - MECCANICA DEI MATERIALI E DELLE STRUTTURE
JF - MECCANICA DEI MATERIALI E DELLE STRUTTURE
SN - 2035-679X
ER -