Fatigue failure criteria of asphalt mixture under moisture influence and cyclic loading

Abstract

The fatigue characteristics of asphalt mixtures in terms of permanent deformation were investigated using a triaxial repeated creep test and a small accelerated loading test. The results indicate that when the specimens in the small accelerated loading tests reach fatigue failure, the variation trend of the vertical residual resilient modulus under different test conditions is consistent with that of the residual resilient modulus at the end of the triaxial repeated creep tests. In addition, the vertical strain, displacement, and laminar base strain in the small accelerated loading test exhibit three stages, which are similar to the three stages observed in the triaxial repeated creep tests. Based on a phenomenological method, the test results of the triaxial repeated creep tests and the small accelerated loading tests can be correlated—under the same test conditions, there is a linear relationship between the fatigue lives obtained from the two types of tests. Furthermore, a temperature-equivalent curve for the fatigue life of the triaxial repeated creep tests influenced by temperature is established, thereby defining the failure criteria for the small accelerated loading test. These findings provide a scientific basis for determining the fatigue failure criteria of small accelerated loading tests and offer a new approach to studying the fatigue failure behavior of asphalt mixtures.

Keywords

Asphalt mixture / Triaxial repeated creep test / Modulus of resilience / Fatigue resistance / Environmental durability

Funding

This study was financially supported by a self-funded project of Inner Mongolia Power (Group) Co., Ltd, Inner Mongolia Power Research Institute (2024, Issue 114, 2024-ZC-2-08), and the Inner Mongolia Natural Science Foundation (2023LHMS05009).

Conflict of interest

The authors declare they have no competing interests.

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