Viscoelastic-Thermodynamic Model and Crack Propagation in Asphalt Concrete Pavement

Abstract

Asphalt concrete pavement has a wide range of applications in the construction of high-grade highways. Asphalt concrete pavement has elastic properties, and its viscoelasticity and viscoplasticity are obviously affected by temperature. To determine whether a structure can continue to be used safely, it is most important to determine whether microscopic or macroscopic cracks present in the structure continue to propagate and cause structural failure. The purpose of this study was to study the effects of different ambient temperatures and mobile vehicles on the stress around the crack tip and the propagation path of different types of asphalt pavements. Based on the theory of fracture mechanics and viscoelasticity, this work studies the problem of crack propagation from a macroscopic perspective. It proposes to use the finite element method to analyze the crack problem in the pavement structure. With the help of ABAQUS software, a curved beam model with cracks was established for calculation, and moving loads and ambient temperature fields were added for analysis. The experimental results in this study show that with the decrease in the ambient temperature, the stress at the crack tip increases continuously. As the analysis time increases, the stress also increases. When the crack is smaller, the stress value at the tip is larger. When a = 15 mm, the stress value at the crack tip is the largest. However, when a = 20 mm and a = 25 mm, the stress at the crack tip is significantly reduced. It shows that the crack is easier to crack when the crack value is smaller. After the crack has grown to a certain length, the growth rate will slow down.

Study on anti-crack effect of semi-rigid base pavement with stress absorbing layer

“…Ameri et al [1] and Sun et al [2] both studied top-down cracking in the transverse direction under traffic loading, while Kang et al [3] comparatively studied longitudinal top-down cracks and base reflective cracks that run transversely. By various modeling methods used in numerical simulation, combining dynamic modulus test and bending test, many scholars have devoted themselves to studying the fracture mechanics, crack paths, propagation phase and fracturing modes of pavement cracks [4][5][6]. The existence and expansion of cracks will not only affect the driving comfort of the road, reduce the durability of the road, but also even trigger the destruction of the entire pavement structure.…”

Retracted: Viscoelastic-Thermodynamic Model and Crack Propagation in Asphalt Concrete Pavement

“…Tis article has been retracted by Hindawi following an investigation undertaken by the publisher [1]. Tis investigation has uncovered evidence of one or more of the following indicators of systematic manipulation of the publication process:…”