Investigations on Strength Characteristics of High-Modulus Asphalt Mixtures under Different Conditions
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 2
Abstract
Due to viscoelastic characteristics, the strength values of the high-modulus asphalt mixtures (HMAM) obtained under different conditions (temperatures, loading rates, and stress states) are quite different, and the serving conditions of asphalt pavements are also varied. Thus, the strength under fixed conditions cannot reflect the mechanical performances of materials under real serving conditions, which leads to inaccuracies in the asphalt pavement structural design. To develop a precise strength evaluating method for high-modulus asphalt mixtures, the strength tests of high-modulus asphalt mixtures were implemented under different conditions (temperatures, loading rates, and stress states) in this study. The test results indicated that for each stress state, the variation of strength with loading rates under different temperatures can be characterized by power functions, and the variation of strength with temperatures under different loading rates can be characterized by exponential functions. The uniform characterizing model of strength under different conditions was established through the dimensionless method and the sigmoidal function. With the effects of temperature, loading rates, and stress states included, the strength obtained can better reflect the mechanical performances in actual pavement serving conditions. The research results contribute to the improvement of the structural resistance design of the asphalt pavement with high-modulus asphalt mixtures.
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Data Availability Statement
Some or all data, models, or codes that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This research is partially sponsored by these agents and organizations: National Natural Science Foundation of China (52078063), Project of Shenzhen Municipal Engineering Corporation (2020zkhx387), Changsha University of Science and Technology Postgraduate Research Innovation Project (CX2021SS105), Technological Innovation Projects of Enterprises in Wuhan (2020020602012145), Beijing Key Laboratory of Traffic Engineering (2020BJUT2T07), Inner Mongolia Autonomous Region, Department of Transportation Projects of Science and Technology (HMJSKJ-201801), Science and Technology Innovation Project of Shanghai Chengtou (Group) Co., Ltd. (CTKY-ZDXM-2020-010 and CTKY-PTRC-2018-003), and Hunan Expressway Group Co. Ltd., and Hunan Department of Transportation (202152). We appreciate the reviewers and editors for their advice on this paper.
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Published In
Journal of Materials in Civil Engineering
Volume 36 • Issue 2 • February 2024
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Sep 10, 2022
Accepted: Jul 14, 2023
Published online: Nov 21, 2023
Published in print: Feb 1, 2024
Discussion open until: Apr 21, 2024
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