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<p>To deepen the understanding of mesoscopic pore characteristics and moisture sensitivity in asphalt pavements, this study innovatively applies a combination of CT scanning and the Moisture Induced Sensitivity Tester (MIST) to directly compare the mesoscopic pore structures of two widely used mixtures: SMA-13 (representing the upper layer) and AC-20 (representing the lower layer) of asphalt pavements. The study systematically investigates the characterization methods for mesoscopic pore structures in these layers and explores the evolution of pore structures under dynamic water scouring. Key findings include: (1) The Marshall specimens exhibited a “concave distribution” of plane porosity, with higher values at both ends and lower values in the middle, while AC-20 demonstrated a more dispersed and fluctuating pore distribution. (2) SMA-13 had greater pore volume and average open pore volume than AC-20, although AC-20 contained more large and highly coordinated open pores. Both mixtures displayed an initial increase, followed by a decrease in open pore volume and quantity as the equivalent diameter increased. (3) The number of throat pores in both mixtures increased and then decreased with increasing equivalent radius and throat length. AC-20’s throat pores were more elongated, whereas SMA-13 exhibited slightly lower tortuosity. (4) The variation in pore quantity was the most pronounced among all mesoscopic parameters, with isolated pores showing a significantly greater variation than open pores. (5) Under dynamic water scouring, newly formed isolated pores generally had smaller diameters and coordination numbers, while larger isolated pores merged with open pores, reducing isolated pore volume. The increase in pore quantity, volume, and coordination number primarily occurred in open pores, highlighting their greater sensitivity to dynamic water scouring. (6) The moisture sensitivity evaluation indicated that open pores were far more moisture-sensitive than isolated pores, with SMA-13 exhibiting higher moisture sensitivity than AC-20. This study provides theoretical insights into the mesoscopic pore structure and moisture sensitivity of asphalt pavements, aiding in the optimization of mixture design and durability assessments.</p>

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Investigation of Mesoscopic Pore Characteristics and Moisture Sensitivity in Asphalt Pavement Using CT Technology

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • Fang Liu,
  • Hang Xiao,
  • Na Fu,
  • Ruowei Lu,
  • Jie Xu

摘要

To deepen the understanding of mesoscopic pore characteristics and moisture sensitivity in asphalt pavements, this study innovatively applies a combination of CT scanning and the Moisture Induced Sensitivity Tester (MIST) to directly compare the mesoscopic pore structures of two widely used mixtures: SMA-13 (representing the upper layer) and AC-20 (representing the lower layer) of asphalt pavements. The study systematically investigates the characterization methods for mesoscopic pore structures in these layers and explores the evolution of pore structures under dynamic water scouring. Key findings include: (1) The Marshall specimens exhibited a “concave distribution” of plane porosity, with higher values at both ends and lower values in the middle, while AC-20 demonstrated a more dispersed and fluctuating pore distribution. (2) SMA-13 had greater pore volume and average open pore volume than AC-20, although AC-20 contained more large and highly coordinated open pores. Both mixtures displayed an initial increase, followed by a decrease in open pore volume and quantity as the equivalent diameter increased. (3) The number of throat pores in both mixtures increased and then decreased with increasing equivalent radius and throat length. AC-20’s throat pores were more elongated, whereas SMA-13 exhibited slightly lower tortuosity. (4) The variation in pore quantity was the most pronounced among all mesoscopic parameters, with isolated pores showing a significantly greater variation than open pores. (5) Under dynamic water scouring, newly formed isolated pores generally had smaller diameters and coordination numbers, while larger isolated pores merged with open pores, reducing isolated pore volume. The increase in pore quantity, volume, and coordination number primarily occurred in open pores, highlighting their greater sensitivity to dynamic water scouring. (6) The moisture sensitivity evaluation indicated that open pores were far more moisture-sensitive than isolated pores, with SMA-13 exhibiting higher moisture sensitivity than AC-20. This study provides theoretical insights into the mesoscopic pore structure and moisture sensitivity of asphalt pavements, aiding in the optimization of mixture design and durability assessments.