Volume 24 Issue 5
Oct.  2024
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LIU Chao-chao, CHEN Meng-jie, ZHANG Hong-gang, CHEN Jie, ZHANG Liang-qi. Fatigue characteristics of long-life cement-stabilized aggregates under complex service conditions[J]. Journal of Traffic and Transportation Engineering, 2024, 24(5): 144-153. doi: 10.19818/j.cnki.1671-1637.2024.05.010
Citation: LIU Chao-chao, CHEN Meng-jie, ZHANG Hong-gang, CHEN Jie, ZHANG Liang-qi. Fatigue characteristics of long-life cement-stabilized aggregates under complex service conditions[J]. Journal of Traffic and Transportation Engineering, 2024, 24(5): 144-153. doi: 10.19818/j.cnki.1671-1637.2024.05.010
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Fatigue characteristics of long-life cement-stabilized aggregates under complex service conditions

doi: 10.19818/j.cnki.1671-1637.2024.05.010
  • 1.

    National Engineering Research Center of Highway Maintenance Technology, Changsha University of Science and Technology, Changsha 410114, Hunan, China

  • 2.

    Guangxi Key Lab of Road Structure and Materials, Guangxi Transportation Science and Technology Group Co., Ltd., Nanning 530007, Guangxi, China

  • 3.

    Detong Intelligent Technology Co., Ltd., Xuchang 461000, Henan, China

Funds:

National Natural Science Foundation of China 52208420

Key Research and Development Program of Guangxi Province GuikeAB20297030

More Information
  • Author Bio:

    LIU Chao-chao(1991-), male, assisant professor, PhD, lcc@csust.edu.cn

  • Received Date: 2024-04-22
    Available Online: 2024-12-20
  • Publish Date: 2024-10-25
    Abstract
  • Under complex service conditions such as different load environments and service lives, the fatigue characteristics of cement-stabilized aggregates with varying curing ages and cement dosages were investigated under different loading modes and frequencies. The fatigue equation of cement-stabilized aggregates under complex service conditions was established based on the loading rate dependent stress ratio. The difference in fatigue characteristics of cement-stabilized aggregates under the influence of internal and external factors was compared and analyzed. A unified representation model of fatigue characteristics of cement-stabilized aggregates under external factors and a conversion relationship of fatigue models under internal factors were proposed. Research results show that under different loading modes, the strengths of cement-stabilized aggregates with varying curing ages and cement dosages are significantly related to the loading rate correlation, and the strength presents a power function relationship with the loading rate. The fatigue curves based on the loading rate dependent stress ratio all cross a fixed strength failure point, and uniformly characterize the single strength failure characteristics and fatigue failure characteristics under cyclic loading. The fatigue test results under different external factors (loading mode, loading frequency, specimen size, shape, etc.) can be characterized uniformly, and the accuracy is above 95%. Fatigue curves under different internal factors (curing age, cement dosage, etc.) present a certain angle to each other, and the size of the angle is related to internal factors within the range of test conditions. Accordingly, the conversion relationship of fatigue models of cement-stabilized aggregates under different internal factors can be established. The fatigue model shows that the fatigue performance of cement-stabilized aggregates tends to stabilize gradually with the increase in curing age and cement dosage.

     

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