Journal of
Faculty of Civil Engineering


FACULTY JOURNALS
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CONFERENCE PROCEEDINGS
5th INTERNATIONAL CONFERENCE
CONTEMPORARY ACHIEVEMENTS IN CIVIL ENGINEERING 2017 , 2017.y., pp. 377-381


ON VISCOELASTIC PROPERTIES OF ASPHALT MIXTURES
 
DOI: 10.14415/konferencijaGFS2017.039
UDC: 691.16:539.3:517.965
CC-BY-SA 4.0 license
Author : Okuka, Aleksandar; Grahovac, Nenad; Žigić, Miodrag; Spasić, Dragan T.
 
 Summary:
 This paper comprises the fractional Kelvin-Zener model of viscoelastic body, the Laplace transform and a least squares method, all applied in creep/recovery testing of asphalt mixtures for the purpose of parameter identification. The parameters describing viscoelastic properties of these mixtures are: the order of the fractional derivative, modulus of elasticity, as well as two relaxation constants that obey restrictions that follow from the second law of thermodynamics. Knowing these four parameters one may predict the behavior of an asphalt mixture for different loads. Besides, the pattern of change of these parameters may be related to alterations of the viscoelastic properties of an asphalt mixture due to either aging or different environmental conditions.
 
 Keywords:
 fractional calculus, system identification, viscoelasticity, asphalt mixtures