A Prediction Model on Viscoelastic Fatigue Damage of Asphalt Mixture.

Limin Li,Xiaoling Jiang,Yuliang Lin,Heng Yan

doi:10.3390/ma13173782

Abstract

Fatigue damage affects both durability and safety, and it has been the most important distress in asphalt concrete. Fatigue damage occurs as a result of repeated traffic loading. An asphalt mixture is a typical viscoelastic material, and its fatigue damage is related to its viscoelastic properties. Under repeated traffic loading, the combined effects of creep damage and fatigue damage will shorten its fatigue life. Currently, the evaluation of the fatigue damage of asphalt mixtures rarely considers the combined effects of creep damage and fatigue damage. To solve this problem, a viscoelastic fatigue damage prediction model of an asphalt mixture considering the combined effects of creep damage and fatigue damage is put forward by introducing parameter β and a displacement factor based on theoretical derivations and testing. The results show that the model can embody the viscoelastic fatigue damage essence of asphalt mixtures, and it can also consider the effects of aging degree, temperature, load frequency and stress on fatigue damage of asphalt mixtures. The maximum relative error of the testing and prediction results of fatigue life is 0.15, and it is a reasonable prediction model.

Highlights

IntroductionThe creep and fatigue cracking of asphalt pavement will occur, which will eventually cause fatigue damage of the asphalt pavement
Under repeated traffic loading, the creep and fatigue cracking of asphalt pavement will occur, which will eventually cause fatigue damage of the asphalt pavement
El-Basyouny et al [1] put forward the fatigue model of the 2002 design guide (DG) model based on the Asphalt Institute MS-1 model

Summary

Introduction

The creep and fatigue cracking of asphalt pavement will occur, which will eventually cause fatigue damage of the asphalt pavement. A practical method predicting fatigue behavior of the asphalt mixture was put forward by Mello et al [8], based on the bending fatigue test and the continuous damage theory. The fatigue life model of an asphalt mixture based on the definition of damage variable was put forward by Castro et al [12]. Zheng et al [14] put forward the nonlinear fatigue damage model for asphalt mixtures based on the elementary theory of fatigue damage. Considering the creep effect, the viscoelastic fatigue damage model of asphalt mixtures has still been rarely addressed at present. To solve the fatigue damage problem of asphalt pavement, it is necessary to investigate the prediction model on viscoelastic fatigue damage of an asphalt mixture considering the creep effect

Model on Viscoelastic Fatigue Damage of Asphalt Mixture

Model Parameters

Burgers’

Characteristics

Conclusions