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<p>This study investigates the mechanism of action of representative molecules of basalt fibers on the healing of water-soaked asphalt. Thermodynamic parameters, morphological characteristics, interfacial healing energy, and interfacial healing strength were analyzed using molecular dynamics and macroscopic tests under different time, temperature, and water conditions to evaluate the specific states and critical conditions involved in self-healing. The results indicate that basalt-fiber molecules can induce rearrangement and a combination of water-soaked asphalt at the healing interface. Hydroxyl groups with different bonding states increase the interfacial adsorption capacity of water-soaked asphalt. The interaction between basalt fiber molecules and water molecules leads to a “hoop” phenomenon, while aromatics-2 molecules exhibit a “ring band aggregation” phenomenon. The former reduces the miscibility of water and asphalt molecules, while the latter causes slow diffusion of the components. Furthermore, a micro-macro dual-scale comparison of interfacial healing strength was conducted at temperatures of 297.15 and 312.15 K to identify the strength transition point and critical temperature of 299.4 K during the self-healing process of basalt-fiber modified water-soaked asphalt.</p>

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Morphological Mechanism and Experimental Verification of Self-healing of Basalt-fiber Modified Water-soaked Asphalt

  • 期刊论文

  • 发表日期：

    2025年1月17日

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  • Minmin Xiao,
  • Jinyong Dong,
  • Chunyan Li,
  • Xu Guo,
  • Jianguo Ren

摘要

This study investigates the mechanism of action of representative molecules of basalt fibers on the healing of water-soaked asphalt. Thermodynamic parameters, morphological characteristics, interfacial healing energy, and interfacial healing strength were analyzed using molecular dynamics and macroscopic tests under different time, temperature, and water conditions to evaluate the specific states and critical conditions involved in self-healing. The results indicate that basalt-fiber molecules can induce rearrangement and a combination of water-soaked asphalt at the healing interface. Hydroxyl groups with different bonding states increase the interfacial adsorption capacity of water-soaked asphalt. The interaction between basalt fiber molecules and water molecules leads to a “hoop” phenomenon, while aromatics-2 molecules exhibit a “ring band aggregation” phenomenon. The former reduces the miscibility of water and asphalt molecules, while the latter causes slow diffusion of the components. Furthermore, a micro-macro dual-scale comparison of interfacial healing strength was conducted at temperatures of 297.15 and 312.15 K to identify the strength transition point and critical temperature of 299.4 K during the self-healing process of basalt-fiber modified water-soaked asphalt.