Normalization of Dynamic Modulus of Asphalt Mixture under Three-dimensional Stress State

被引：0

作者：

Lyu S.-T. ^{[1
]}

Zhang N.-T. ^{[1
]}

Wu Z.-D. ^{[2
]}

Xia C.-D. ^{[1
]}

Liu C.-C. ^{[1
]}

Ge D.-D. ^{[1
]}

Zhao S.-G. ^{[3
]}

Li Z. ^{[1
,4
]}

机构：

[1] School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Hunan, Changsha

[2] International College of Engineering, Changsha University of Science & Technology, Hunan, Changsha

[3] Ganzhou Transportation Holding Group Corp., Jiangxi, Ganzhou

[4] Transportation Quality Supervision Department of Inner Mongolia, Inner Mongolia, Hohhot

来源：

Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2023年 / 36卷 / 04期

基金：

中国国家自然科学基金;

关键词：

asphalt mixture; dynamic modulus; master curve; road engineering; strength; stress ratio;

D O I：

10.19721/j.cnki.1001-7372.2023.04.003

中图分类号：

学科分类号：

摘要：

The dynamic modulus of asphalt mixtures is an important parameter for pavement mechanical response analysis and structural design. To objectively characterize the influence of different stress states, test temperature, and loading frequency on the dynamic modulus of the asphalt mixture, the prediction model under complex service conditions was established to reveal the service state correlation of the dynamic modulus. First, uniaxial compression, indirect tensile, and direct tensile strength tests reveal the power function variation law of strength with loading rate, which provides a basis for determining the stress ratio in the modulus test. Based on this, uniaxial compression, indirect tensile, and direct tensile modulus tests of asphalt mixtures under different temperatures and loading frequencies were carried out, and the dynamic modulus analysis method of asphalt mixtures with equivalent stress representing the stress ratio under a three-dimensional stress state was proposed. The sigmoidal function was adopted based on the time-temperature equivalence principle. A normalized prediction model of the dynamic modulus based on the stress ratio under a three-dimensional stress state was established, and a unified characterization of the dynamic modulus of the asphalt mixture under different test methods was realized. The results showed that the strength of the asphalt mixture under different stress states increased with an increase in the loading rate. The stress ratio under a three-dimensional stress state based on equivalent stress characterization can realize the unified characterization of the asphalt mixture dynamic modulus under different test conditions and avoid the uncertainty of design results caused by artificially selecting material modulus design parameters in the pavement structure design. This research can provide a basis for improving the effectiveness and reliability of asphalt pavement structural design. © 2023 Xi'an Highway University. All rights reserved.

引用

页码：27 / 37

页数：10

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