不同类型沥青分子链空间特征对沥青纳米裂缝温度自愈行为的影响
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东北林业大学土木与交通学院

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U416

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Influence of spatial characteristics of different asphalt molecular chains on temperature self-healing behavior of asphalt nano-cracks
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School of Civil Engineering and Transportation,Northeast Forestry University,Harbin,150040

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    摘要:

    为研究不同沥青分子链空间特性对沥青纳米裂纹温度自愈合行为的影响,采用分子动力学和微观实验,探究纳米裂纹温度自愈合的微观机理。首先,建立基质沥青、老化沥青、基于四叔丁基苯乙烯再生沥青的分子结构模型,并对其进行合理性验证。其次,在纳米裂纹温度自修复过程中通过对沥青质组分进行了标记,得到沥青质分子链空间特征,包括自愈合过程中的结构自由体积数、分子链空间角度及能量的分布特征。最后,通过微观试验,得到了不同沥青的温度自愈行为特征和模拟的合理性。结果表明,沥青纳米裂纹的温度自愈行为受分子链空间状态的影响; 不同空间结构的分子链对纳米裂纹的影响不同。平行分布状态在促进纳米裂纹的温度自愈合方面表现显著,其次是呈一定角度堆积状态,而侧对侧堆积则对纳米裂纹的温度自愈合行为不利。本研究从微观角度阐述了不同沥青分子链空间特性对沥青纳米裂纹温度自修复的影响,为沥青材料的可持续发展提供了理论依据。

    Abstract:

    This study aims to investigate the influence of different spatial properties of asphalt molecular chains on the temperature self-healing behavior of asphalt nano-cracks. Molecular dynamics simulations and microscopic experiments were conducted to explore the microscopic mechanism of temperature self-healing in nano-cracks. Firstly, molecular structure models of virgin asphalt, aged asphalt, and tetra-tert-butylstyrene-based recycled asphalt were created, and their validity was verified. Secondly, by labeling the asphaltene components during the temperature self-healing process of the nano-cracks, the spatial characteristics of asphaltene molecular chains, such as the number of structural free volumes, the spatial angle of molecular chains, and the distribution characteristics of energy, were obtained. Finally, microscopic tests were conducted to examine the temperature self-healing behavior of different asphalt samples and the plausibility of the simulation. The results indicate that the temperature self-healing behavior of asphalt nano-cracks is influenced by the spatial configuration of the molecular chains, and different spatial structures have varying effects on the nano-cracks. The parallel distribution state greatly promotes the temperature self-healing of nano-cracks, followed by an angular stacking state. In contrast, side-to-side stacking impedes the temperature self-healing behavior of the nano-cracks. This study provides a microscopic perspective on the impact of different spatial properties of asphalt molecular chains on the temperature self-repair of asphalt nano-cracks, offering a theoretical foundation for the sustainable development of asphalt materials.

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于明洋,张海涛. 不同类型沥青分子链空间特征对沥青纳米裂缝温度自愈行为的影响[J]. 科学技术与工程, , ():

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  • 收稿日期:2024-03-04
  • 最后修改日期:2024-04-26
  • 录用日期:2024-05-02
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