Regularities of Unsteady-State Creep of Asphalt Concrete
Iskakbayev A. Teltayev B. Aitbayev Y. Zhaisanbayev A.
September 2025Engineered Science Publisher
ES Materials and Manufacturing
2025#29
The article studies the unsteady-state creep of a dense fine-grained road asphalt concrete prepared using a bitumen of grade 100-130 by penetration at direct tension at different stresses and temperatures. Creep experiments were performed in two specially designed and assembled installations with thermal chambers (T=60℃…-24℃). For the mathematical description of creep curves, a model is proposed in the form of a power function with a normalized time argument with three physical parameters: ξ is the parameter of hardening, t1is the period of hardening; ε1 is the limiting strain of hardening. It has been established that the nature of the limiting strain of hardening-stress dependence is different in different temperature ranges, which is explained by the ratios of the contribution of the parameters ξ and t1to the deformation process. The so-called kinetic characteristics have been newly introduced which characterize the intensity of a stress effect on the parameters ξ and t1Three characteristic intervals have been established in the temperature dependence of the kinetic characteristics, within which the asphalt concrete is in viscoelastic, viscoelastoplastic and viscous-flow states, respectively. Analytical expressions have been found for the rates of unsteady-state and steady-state creep, shear viscosity of the asphalt concrete, including only the parameters of the unsteady-state creep ξ, t1ε1
Approximation , Asphalt concrete , Creep rates , Kinetic characteristics , Parameters , Uniaxial tension , Unsteady-state creep , Viscosities
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U. Joldasbekov Institute of Mechanics of Engineering, Almaty, 050013, Kazakhstan
Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Road Research and Production Center, Almaty, 050000, Kazakhstan
U. Joldasbekov Institute of Mechanics of Engineering
Al-Farabi Kazakh National University
Road Research and Production Center
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