Abstract
The expression is obtained for determination of cyclic tensile strength for asphalt concrete, which considers damage accumulation and history of loading, using the long-term strength curve for asphalt concrete obtained according to the test results of more than 110 samples to failure at stresses from 0.05 to 0.31 MPa and by introduction of damage kernel in this paper. Cyclic strength depends on the stress, parameters of long-term strength, frequency of loading, durations of loading and relax periods, and ratio of loading period to the long-term strength. Evaluation of accuracy for the obtained expression for the cyclic strength has been performed by comparison with the results of a series for experimental tests of asphalt concrete samples at a temperature of 22 °С and cyclic loading conditions. The stress is 0.31 MPa, and the durations of loading and relax periods are 5 and 60 s, respectively. Calculations performed with the obtained expressions at real road conditions (the stress is 0.31 MPa, and the durations of loading and relax periods are 0.1 and 9.9 s respectively) showed the possibility of its use for the prediction of fatigue (multicyclic) strength of an asphalt concrete pavement for a highway.
Highlights
Asphalt concrete layers of highways during their service life are subject to complex combinations of mechanical impacts of vehicles’ wheels and environmental temperature
Further we will use the approach when the process of damage accumulation with creep is evaluated by scalar failure parameter ω(t) for the development of the cyclic strength model for the asphalt concrete
It should be expected that the fatigue strength of the asphalt concrete pavement decreases with the increase of value for load and duration of loading period, and the increase of the relax period between sequential loads increases the fatigue strength
Summary
Asphalt concrete layers of highways during their service life are subject to complex combinations of mechanical impacts of vehicles’ wheels and environmental temperature. One of the prediction models for materials and structures damage, considering load impact of different values, is the well-known Miner’s law [6]. In the US, it is used for prediction of the fatigue life for the asphalt concrete pavement of highways [8] In this regard fatigue damage is calculated under the following equation: T. i =1 where D is damage, T is total number of periods, ni is actual traffic period i, and Ni is traffic allowed under conditions prevailing in i. As under real road conditions, the speed of the vehicles varies within wide ranges, and axle load duration differs greatly. Equation (1), based on Miner’s law, does not consider load duration, which can be a source of systematic large inaccuracies during determination of fatigue life for asphalt concrete pavement of the highway. The expression is obtained for determination of cyclic tensile strength for the asphalt concrete, which considers damage accumulation and history of loading, using the long-term strength curve for asphalt concrete, obtained according to the test results of more than 110 samples to failure at stresses from 0.05 to 0.31 MPa, and by introduction of damage kernel
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