Rutting Prediction Model of Asphalt Mixture Based on the Triaxial Repeated Load Test

Jie Ji,Lei Chen,Jiani Wang,Jianming Wei,Zhi Suo,Meng Chen,Jin Luo

doi:10.1155/2021/5238680

Abstract

This study establishes a more reasonable and effective rutting prediction model called the quadratic modified Burgers rheological model by considering dynamic loads. Use ABAQUS to simulate the rutting depths through the existing Burgers model and the quadratic modified model and compare with the measured values of the multitemperature and load rutting tests and triaxial repeated load tests. The real tests were conducted on four asphalt mixtures, including SK-90 asphalt mixture, styrene-butadiene-styrene (SBS) modified asphalt mixture, direct coal liquefaction residue (DCLR) modified asphalt mixture, and compound DCLR modified asphalt mixture. The results showed that the range of error ratio and residual sum of squares between simulated and measured rutting depth based on the two different models are 5–35%/5.0–8.74% and 3–15%/0.9–3.1%, respectively, which show that the quadratic modified Burgers rheological model has a more accurate prediction.

Highlights

Establishing the rutting prediction model of asphalt mixture is the mainstream scheme to study the rutting resistance of asphalt pavement
The results show that the rheological model can effectively predict the asphalt pavement depth [18]
The results show that the model can better characterize the different stages of creep of asphalt mixture

Summary

Introduction

Establishing the rutting prediction model of asphalt mixture is the mainstream scheme to study the rutting resistance of asphalt pavement. The rutting test in lab is one of the main methods to assess the rutting resistance of asphalt mixture in China. This kind of test cannot directly reflect the mechanical properties of materials, so the model established by it has certain limitations. Another kind of test is based on mechanical principles, such as the uniaxial creep test and triaxial repeated load test [4,5,6]. Because there is a linear relationship between stress and strain of specimens in this kind of test, mechanical parameters reflecting material properties can be calculated and a complete rutting prediction model can be established. Multiaxial repeated tests, for example, the triaxial repeated load test, were considered as a more suitable choice

Objectives

Results

Conclusion