A Prediction Model on Viscoelastic Fatigue Damage of Asphalt Mixture

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.

A Design Method on Durable Asphalt Pavement of Flexible Base on Anti-Rutting Performance and Its Application

“…The creep tests of asphalt mixtures were performed on 810MTS (Material Test System) according to the literature [25]. Dynamic creep tests of asphalt mixtures were completed using a Cooper material testing machine from Cooper Research Technology Britain in England under the action of a rectangular wave cyclic load with the frequency of 0.5 Hz according to the literature [26].…”

“…where β is a parameter related to the material aging degree, stress amplitude, loading frequency, temperature, etc. [26]; N f is fatigue life; σ is Cauchy stress, α τ is the shift factor; J 2 (α T ω) is dissipation compliance; and ω is angular velocity. According to Equation (7) and Equation ( 8), α τ and J 2 (α T ω) can be obtained, respectively.…”

“…where C 1 and C 2 are constants; T and T 0 are the test temperature and the reference temperature, respectively, in • C; and η 2 and E 2 are the viscoelastic parameters of Burgers' model. Considering the difference between the indoor fatigue test and field conditions, the fatigue life of pavement can be predicted using Equation ( 9) [1,26].…”

Evaluation of Linear Deformation and Unloading Stiffness Characteristics of Asphalt Mixtures Incorporating Various Aggregate Gradations

“…In recent years various researchers have carried out experimentation on the stiffness properties of asphalt mixtures [10][11][12]. The effect of mixture stiffness on the fatigue life of asphalt pavements was investigated [13][14][15]. Different studies were performed to assess the durability of laboratory-prepared asphalt mixtures [16][17][18].…”

Effect of Fractured Aggregate Particles on Linear Stress Ratio of Aggregate and Resilience Properties of Asphalt Mixes—A Way Forward for Sustainable Pavements

“…In recent years, various researchers carried out experimentation regarding the stiffness of asphalt mixes, which is based on the properties of asphalt constituents, i.e., aggregate and asphalt binder [29][30][31][32][33][34][35][36][37][38][39][40][41]. Many studies have explored the effects of different types of aggregate and gradations on resilient modulus (MR) of asphalt mixes.…”