中文核心期刊
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重庆交通大学学报（自然科学版）

重庆交通大学学报（自然科学版） ›› 2025, Vol. 44 ›› Issue (10): 29-34.DOI: 10.3969/j.issn.1674-0696.2025.10.04

• 道路与铁道工程 • 上一篇    

热再生沥青混合料微观空隙结构冻融损伤特性研究

李艳1，李志刚2,3，赵桂娟2,3，杨法勇1，邱业绩1   

  1. (1.西安公路研究院有限公司，陕西 西安 710065， 2.西安科技大学 建筑与土木工程学院，陕西 西安 710054； 3.西安科技大学 道路工程研究中心，陕西 西安 710054)
  • 收稿日期:2024-10-08 修回日期:2025-07-10 发布日期:2025-11-06
  • 作者简介:李艳（1990—），女，陕西西安人，高级工程师，硕士，主要从事道路固废技术应用相关工作。E-mail：964200108@qq.com 通信作者：李志刚（1988—），男，山东日照人，副教授，博士，主要从事道路材料研发与性能评价相关研究。E-mail：lizhigang@xust.edu.cn
  • 基金资助:
    陕西省省级国有资本经营预算科技创新专项资金项目（基于数字化的多源固废再生利用低碳道路关键技术研究与示范）；陕西省交通运输厅2022年度交通科研项目（22-17K）；陕西省科学技术协会青年人才托举计划项目（20230443）；陕西省科学技术协会青年人才托举计划项目（20240409）

Freeze Thaw Damage Characteristics of Microscopic Void Structure in Hot Recycled Asphalt Mixture

LI Yan1, LI Zhigang2,3, ZHAO Guijuan2,3, YANG Fayong1, QIU Yeji1   

  1. (1.Xian Highway Research Institute Co., Ltd ., Xian 710075, Shaanxi, China; 2. School of Architecture and Civil Engineering, Xian University of Science and Technology, Xian 710054, Shaanxi, China; 3. Road Engineering Research Center, Xian University of Science and Technology, Xian 710054, Shaanxi, China)
  • Received:2024-10-08 Revised:2025-07-10 Published:2025-11-06

摘要： 厂拌热再生沥青混合料在拌和时会添加新沥青恢复旧沥青性能，导致其抗水损坏能力下降。结合X-ray CT扫描试验和数字图像处理方法，分析冻融循环作用下热再生沥青混合料空隙特征演变规律，以期揭示热再生沥青混合料冻融损伤机理。研究表明：经20次冻融后，热再生沥青混合料空隙面积增大至未冻融的4.7倍；冻融循环作用导致空隙损伤加剧，造成微体积空隙扩张直至相邻空隙连通；前5次冻融循环，微体积空隙损伤以扩展为主导，V＜0.1 mm3的空隙数量比例增大；随着冻融次数继续增加，相邻空隙体积扩张发生连通作用占主导，V＜0.1 mm3的空隙数量比例减少，而0.1 mm3≤V＜5.0 mm3的空隙数量比例减少幅度降低；空隙连通作用致使0.1 mm3≤V＜5.0 mm3的空隙数量比例减少，而5.0 mm3≤V＜10.0 mm3的空隙数量比例增大；冻融循环作用导致混合料空隙平均等效直径和期望直径均呈不同程度增大，三维分形维数与球体分形维数差异变大，空隙空间区域形态往更加不规则方向发展。

关键词: 热再生沥青混合料；空隙数量分布；空隙尺寸；空隙形态

Abstract: The addition of virgin asphalt to restore the performance of waste asphalt in factory mixed hot recycled asphalt mixtures (HRAM) often results in a decrease in their resistance to water damage. The evolution law of void characteristics in hot recycled asphalt mixtures under freeze-thaw cycles was analyzed by X-ray CT scanning experiments and digital image processing methods, in order to reveal the mechanism of freeze-thaw damage in hot recycled asphalt mixtures. Research shows that after 20 freeze-thaw cycles, the void area of HRAM increases to 4.7 times that of unfrozen asphalt mixture. The freeze-thaw cycle exacerbates void damage, causing micro-volume voids to expand until adjacent voids are connected. In the first 5 freeze-thaw cycles, the damage to micro-volume voids is primarily driven by expansion, and the proportion of voids with V<0.1 mm3 is increased. As the number of freeze-thaw cycles continues to increase, the expansion of adjacent void volumes is dominated by connectivity, and the proportion of voids with V<0.1 mm3 is decreased, while the rate of decrease in the proportion of void amounts with 0.1 mm3≤V<5.0 mm3 slows down. The effect of voids connectivity leads to a decrease in the proportion of voids amounts with 0.1 mm3≤V＜5.0 mm3, while the proportion of voids amounts with 5.0 mm3≤V＜10 mm3 increases. The freeze-thaw cycle causes both the average equivalent diameter and expected diameter of voids in the mixture to increase with varying degrees, and the difference between the three-dimensional fractal dimension and the spherical fractal dimension becomes larger. The morphology of the void space area develops in a more irregular direction.

Key words: highway engineering; freeze-thaw cycle effect; hot recycled asphalt mixture; distribution of void amount; void size; void morphology

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