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<p>To address the problem that the mechanical parameters of semi-flexible pavement materials are significantly influenced by multiple factors and the mismatch between these parameters’ value and the actual mechanical properties, this study investigates the variation laws of uniaxial compressive and direct tensile dynamic (and static) moduli of a typical semi-flexible pavement material (SFP-16) under different loading levels, temperatures, and loading frequencies (loading rates). It reveals the different mechanical characteristics in tension and compression and conducts an applicability analysis of SFP materials based on the bi-modulus theory. The research demonstrates that the stress-strain characteristics of SFP-16 under tension and compression conform to the bilinear behavior described by the bi-modulus theory. Furthermore, the tensile and compressive moduli exhibit well-defined nonlinear relationships with the influencing factors. The load level most significantly influences the compressive dynamic modulus, with an increase of nearly threefold. The difference in tension and compression of SFP-16 is most pronounced under high-temperature and low-frequency conditions. The master curve of compressive dynamic modulus is significantly higher than that of tensile dynamic modulus across the entire frequency domain (by approximately 5.5%). Compared to loading frequency, temperature exerts a more significant influence on the difference in tension and compression of SFP-16, with variation amplitude exceeding 30%. Therefore, adopting a compressive-tensile dynamic (static) modulus ratio of 1.6 is recommended under conventional conditions (20&#xa0;°C, 10&#xa0;Hz). A conversion methodology was developed between dynamic and static moduli under tension and compression of SFP-16, along with their corresponding conversion equations under various influencing factors. When SFP-16 is applied to the middle-upper surface layer, the pavement structure comprehensively optimizes all key mechanical responses. The optimal shear resistance performance is obtained at a 10&#xa0;cm thickness of SFP-16. These findings can provide references for parameter selection and structural optimization design of semi-flexible pavement materials based on the bi-modulus theory.</p>

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Different Mechanical Properties in Tension and Compression of Semi-Flexible Pavement Materials and Analysis of its Application Layers

  • 期刊论文

  • 发表日期：

    2026年1月30日

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  • Qinxue Pan,
  • Yuting Tan,
  • Jia Hu,
  • Songtao Lv,
  • Xiaojin Song,
  • Shurui Zhou,
  • Qiuzhong Li,
  • Zhe Xu

摘要

To address the problem that the mechanical parameters of semi-flexible pavement materials are significantly influenced by multiple factors and the mismatch between these parameters’ value and the actual mechanical properties, this study investigates the variation laws of uniaxial compressive and direct tensile dynamic (and static) moduli of a typical semi-flexible pavement material (SFP-16) under different loading levels, temperatures, and loading frequencies (loading rates). It reveals the different mechanical characteristics in tension and compression and conducts an applicability analysis of SFP materials based on the bi-modulus theory. The research demonstrates that the stress-strain characteristics of SFP-16 under tension and compression conform to the bilinear behavior described by the bi-modulus theory. Furthermore, the tensile and compressive moduli exhibit well-defined nonlinear relationships with the influencing factors. The load level most significantly influences the compressive dynamic modulus, with an increase of nearly threefold. The difference in tension and compression of SFP-16 is most pronounced under high-temperature and low-frequency conditions. The master curve of compressive dynamic modulus is significantly higher than that of tensile dynamic modulus across the entire frequency domain (by approximately 5.5%). Compared to loading frequency, temperature exerts a more significant influence on the difference in tension and compression of SFP-16, with variation amplitude exceeding 30%. Therefore, adopting a compressive-tensile dynamic (static) modulus ratio of 1.6 is recommended under conventional conditions (20 °C, 10 Hz). A conversion methodology was developed between dynamic and static moduli under tension and compression of SFP-16, along with their corresponding conversion equations under various influencing factors. When SFP-16 is applied to the middle-upper surface layer, the pavement structure comprehensively optimizes all key mechanical responses. The optimal shear resistance performance is obtained at a 10 cm thickness of SFP-16. These findings can provide references for parameter selection and structural optimization design of semi-flexible pavement materials based on the bi-modulus theory.