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Abstract

In response to the randomness and discreteness of small-sample fatigue test results, a three-parameter Weibull distribution was introduced to analyze the indirect tensile fatigue test data of AC-20 asphalt mixture. The results show that under small sample tests, the three-parameter Weibull distribution function can clearly reflect the life probability distribution of asphalt concrete materials, and the introduction of the minimum fatigue life parameter N0 can effectively avoid unreasonable estimation of the early fatigue failure probability of the test. The stress fatigue equation in different working conditions shows that as the temperature increases, the fatigue resistance of the asphalt mixture decreases exponentially, with the decreasing sensitivity of fatigue performance to stress. Excessive alternating stress on asphalt pavement at low temperatures will accelerate fatigue failure. Additionally, as the temperature increases, the k value that characterizes the fatigue resistance of the mixture will not be controlled by the assurance rate. The k value can effectively describe and distinguish the fatigue performance of asphalt mixtures at low temperatures. During estimating the fatigue life of asphalt mixtures, it is advisable to select an assurance rate based on design requirements to ensure safe conclusions and improve material performance utilization.

Publication Date

8-18-2022

DOI

10.14048/j.issn.1671-2579.2022.04.032

First Page

175

Last Page

179

Submission Date

May 2025

Reference

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