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Appl. Sci. 2018, 8(9), 1500; https://doi.org/10.3390/app8091500

Standardization of Fatigue Characteristics of Cement-Treated Aggregate Base Materials under Different Stress States

1
National Engineering Laboratory of Highway Maintenance Technology, Changsha University of Science & Technology, Changsha 410004, Hunan, China
2
Department of Civil and Environmental Engineering, Michigan Technological University, Houghton, MI 49931, USA
*
Author to whom correspondence should be addressed.
Received: 5 August 2018 / Revised: 20 August 2018 / Accepted: 27 August 2018 / Published: 1 September 2018
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Abstract

In this study, to decrease the evaluation uncertainty of the fatigue characteristics of cement-treated aggregate base materials under different test conditions, unconfined compressive, indirect tensile, flexural tensile strength tests and fatigue tests of these base materials with different cement content and at different curing times were carried out. The Weibull distribution was employed to analyze fatigue test results. The standardization model of fatigue characteristics for cement-treated aggregate base materials under different stress states was established. Based on the interval analysis theory, the fatigue characteristic model under different stress states was established using interval parameters. Results revealed that the curing time and cement content considerably affect the strength and fatigue characteristics of cement-treated aggregate base materials, and with increasing cement content and curing time, the fatigue resistance of cement-treated aggregate base materials can be improved. Clear differences between the fitting parameters a and b of the S-N fatigue equation of cement-treated aggregate base materials under different stress states were observed, which can be eliminated by using the analysis method based on the Weibull distribution and the standardization model, and a unified expression for the cement-treated aggregate base materials under different test conditions was realized. A Standardization model of fatigue characteristics based on the interval analysis new method could solve several problems such as inadequate sampling representation, low precision, and insufficient stability of test equipment; thus, the errors caused by materials, structures, the environment, and loads can be reduced, making the fatigue life interval more reasonable and scientific compared to the point numerical fatigue life. Regression parameters a and be were in intervals [9.0, 10.6] and [9.9, 11.3], respectively, and parameters a and b were similar, which improve the test accuracy and reduce the data error. View Full-Text
Keywords: cement-treated aggregate base materials; fatigue equation; Weibull distribution; Standardization model; interval parameter analysis cement-treated aggregate base materials; fatigue equation; Weibull distribution; Standardization model; interval parameter analysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Xie, J.; Tang, L.; Lv, S.; Zhang, N.; Huang, T.; Liu, H. Standardization of Fatigue Characteristics of Cement-Treated Aggregate Base Materials under Different Stress States. Appl. Sci. 2018, 8, 1500.

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