Frost Resistance and Mechanical Characteristics of Cement-Stabilized Macadam Mixed with Rubber Powder
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 7
Abstract
This study aimed to prepare cement-stabilized macadam mixed with rubber powder (CSMR) by replacing the aggregate with rubber powder using the same size with the aggregate of less than 1.7 mm by the equal-volume substitution method. The rubber powder content was 10%, 20%, 30%, and 45% of the aggregate volume (less than 1.7 mm). Combining the unconfined compressive strength test and freeze-thaw cycle test in the laboratory, the frost resistance and mechanical characteristic evolution law of CSMR were studied and analyzed, and the nonlinear stress-strain curve of the material was obtained. The results were as follows: first, the compressive strength of CSMR decreased with the increase in the rubber powder content, and the average unconfined compressive strength of was 1.35 MPa in 7 days, which still met the basic strength requirements of the railway subgrade bed. Second, the frost resistance evaluation index () decreased first and then increased with the increase in rubber powder content. When the rubber powder content was more than 30%, the CSMR showed better freeze-thaw resistance. Finally, based on the Duncan–Chang hyperbolic model and the strain-softening adjustment coefficient, the mechanical constitutive equation of the material was established and the nonlinear mechanical characteristics of the whole process of CSMR were well described. Meanwhile, the analysis of the material stiffness attribute parameters showed the addition of rubber powder significantly improved the toughness of the material compared with the traditional cement-stabilized macadam. This study was of great significance to further understand the basic mechanical properties of CSMR and to construct load-passing durable railway subgrade structures.
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Data Availability Statement
Some or all data, models, or code that supported the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This study was funded by the National Natural Science Foundation of China (Nos. 52172347 and 42001059), the Natural Science Foundation of Hebei Province (Nos. E2020210006 and E2022210029), the Hainan Provincial Natural Science Foundation of China (Nos. 422RC599, 520QN229, and 122RC541), the Systematic Project of State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University (No.KF2022-03), and the Scientific Research Startup Foundation of Hainan University (No. KYQD(2R)1969). Thanks for the support provided by the presented funds for this study.
Author Contributions: Shaolong Jie was involved in the concept proposal and arrangement, original draft writing, and data analysis. Shuai Mao and Tiecheng Sun performed the data analysis. Zurun Yue and Tianfei Hu supervised the work. Zhiqi Sun worked on the methodology. Peng Xie and Zhihao Yang conducted the data curation. Lanlan Yuan performed the laboratory tests.
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 7 • July 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: May 10, 2022
Accepted: Nov 3, 2022
Published online: Apr 24, 2023
Published in print: Jul 1, 2023
Discussion open until: Sep 24, 2023
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