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材料导报  2023, Vol. 37 Issue (2): 21060216-6    https://doi.org/10.11896/cldb.21060216
  无机非金属及其复合材料 |
多尺度评价相对湿度对沥青-集料黏附性的影响
罗蓉1,2,*, 王伟1,2, 罗晶1,2, 习磊1,2
1 武汉理工大学交通学院,武汉 430063
2 湖北省公路工程技术研究中心,武汉 430063
Multi-scale Evaluation of the Influence of Relative Humidity on Asphalt-Aggregate Adhesion Performance
LUO Rong1,2,*, WANG Wei1,2, LUO Jing1,2, XI Lei1,2
1 School of Transportation, Wuhan University of Technology, Wuhan 430063, China
2 Hubei Highway Engineering Research Center, Wuhan 430063, China
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摘要 本工作分别在四种具有代表性的相对湿度条件下,对沥青-集料进行了宏观拉拔试验和微观表面能试验,以研究相对湿度对其黏附性的影响规律。研究结果表明:在宏观上,拉拔力随相对湿度的增加逐渐减小,同时沥青-集料界面由内聚开裂向混合开裂过渡;在微观上,沥青内聚能随相对湿度变化不明显,而沥青-集料界面结合能随着相对湿度的增加而降低。因此,沥青-集料的黏附性随着相对湿度的增加而逐渐减小,水气分子浓度的增大能够加剧水分子对沥青的置换,使得沥青更容易从集料表面剥落。通过沥青的宏观剥落率和微观表面能参数,建立了界面能指标,该指标多尺度地评价了沥青与集料的黏附性,评价结果与宏、微观试验一致,表明界面能指标的有效性。
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罗蓉
王伟
罗晶
习磊
关键词:  公路工程  相对湿度  表面能  沥青混合料  拉拔力  界面能    
Abstract: In order to study the influence of relative humidity on asphalt-aggregate adhesion, this work designs a macroscopic pull-out test and a microscopic test under four representative relative humidity conditions. The research results show that at the macroscopic scale, the pull-out force gradually decreases with the increase of relative humidity, and the cracking of asphalt-aggregate interface transitions from cohesive cracking to mixed cracking;at the microscopic scale, the cohesive energy of asphalt does not change significantly with relative humidity. The adhesive energy of asphalt-aggregate interface decrease with the increase of relative humidity. Therefore, the adhesion of asphalt-aggregate gradually decreases with the increase of relative humidity, and the increase of water vapor concentration can aggravate the displacement of asphalt by water molecules, making it easier for the asphalt to peel off the surface of the aggregate. Based on the macroscopic spalling rate and the microscopic surface energy parameters, an interface energy index was established. This index evaluates the adhesion of asphalt and aggregate at multiple scales. The evaluation results consistent with macro and micro tests indicate the effectiveness of interface energy indicators.
Key words:  road engineering    relative humidity    surface energy    asphalt mixture    pull-out force    interface energy
发布日期:  2023-02-08
ZTFLH:  U414  
基金资助: 国家自然科学基金(51778514)
通讯作者:  *罗蓉,武汉理工大学交通学院教授,湖北省公路工程技术研究中心主任,2007年获得美国得克萨斯州奥斯汀分校土木工程专业工学博士。入选国家“万人计划”科技创新领军人才。主要研究方向为道路沥青混合料损伤机理、沥青路面结构计算及仿真、道路材料表面自由能理论与试验。在国内外学术期刊上发表论文60余篇,授权国家发明专利21项。先后主持国家重点基础研究计划(973计划)青年科学家项目、国家自然科学基金面上项目等20余项。   
引用本文:    
罗蓉, 王伟, 罗晶, 习磊. 多尺度评价相对湿度对沥青-集料黏附性的影响[J]. 材料导报, 2023, 37(2): 21060216-6.
LUO Rong, WANG Wei, LUO Jing, XI Lei. Multi-scale Evaluation of the Influence of Relative Humidity on Asphalt-Aggregate Adhesion Performance. Materials Reports, 2023, 37(2): 21060216-6.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.21060216  或          http://www.mater-rep.com/CN/Y2023/V37/I2/21060216
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