Abstract
This paper reports the experimental investigation of the steady-state creep process for fine-grained asphalt concrete at a temperature of 20 ± 2 °С and under stress from 0.055 to 0.311 MPa under direct tension and was found to occur at a constant rate. The experimental results also determined the start, the end point, and the duration of the steady-state creep process. The dependence of these factors, in addition to the steady-state creep rate and viscosity of the asphalt concrete on stress is satisfactorily described by a power function. Furthermore, it showed that stress has a great impact on the specific characteristics of asphalt concrete: stress variation by one order causes their variation by 3–4.5 orders. The described relations are formulated for the steady-state of asphalt concrete in a complex stressed condition. The dependence is determined between stress intensity and strain rate intensity.
Highlights
Asphalt concrete is one of the main materials used for highway pavements
For creep curve stage II, the asphalt concrete deformation occurred at a constant rate
The stress has a great influence on the strain rate where the increase of stress by one order increases the strain rate approximately by four orders; The dependences were constructed for the start point, end point, and the duration of the stage of steady-state creep on the stress
Summary
Asphalt concrete is one of the main materials used for highway pavements. The determination of the mechanical behavior of an asphalt concrete, taking into account the variation of the above-mentioned factors, has important practical value. It is known that the basic methods for evaluating the mechanical behavior of viscoelastic materials are tests on creep and relaxation [4,5,6]. Creep test investigations are easy to conduct, and their results make it possible to construct creep and long-term strength curves. Relaxation curves can be obtained from the creep curves by using known methods [6,7]. The long-term strength curves enable us to determine the service life of an asphalt concrete pavement
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