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Appl. Sci. 2017, 7(12), 1270; https://doi.org/10.3390/app7121270

Modeling of Cyclic Strength for the Asphalt Concrete Considering Damage Accumulation

1
Department of Mechanics, Al-Farabi Kazakh National University, Almaty 050040, Kazakhstan
2
Kazakhstan Highway Research Institute, Almaty 050061, Kazakhstan
3
Department of Chemistry and Chemical Technologies, University of Calabria, 87036 Rende, Italy
*
Author to whom correspondence should be addressed.
Received: 14 November 2017 / Revised: 27 November 2017 / Accepted: 30 November 2017 / Published: 5 December 2017
(This article belongs to the Section Materials)
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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. View Full-Text
Keywords: asphalt concrete; long-term strength curve; cyclic creep; cyclic strength; expression for cyclic strength; kernel for damage accumulation; loading history asphalt concrete; long-term strength curve; cyclic creep; cyclic strength; expression for cyclic strength; kernel for damage accumulation; loading history
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Iskakbayev, A.; Teltayev, B.; Oliviero Rossi, C. Modeling of Cyclic Strength for the Asphalt Concrete Considering Damage Accumulation. Appl. Sci. 2017, 7, 1270.

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