Dong Yuanshuai, Wang Zihao, Ren Wanyan, Jiang Tianhao, Hou Yun, Zhang Yanhong
China Highway Engineering Consulting Group Co., Ltd., No. 17 Changyungong Road, Haidian District, Beijing 100089, China.
Research and Development Center on Highway Pavement Maintenance Technology, CCCC, No. 116 Zizhuyuan Road, Haidian District, Beijing 100097, China.
Materials (Basel). 2023 Jul 10;16(14):4926. doi: 10.3390/ma16144926.
This research aims to improve the durability of skid resistance of asphalt pavement from the perspective of coarse aggregates based on on-site investigation. Firstly, the skid resistance of six representative actual roads was tested during two years by employing the Dynamic Friction Tester and the attenuation characteristics of skid resistance of different types of asphalt pavements were analyzed. Secondly, core samples were drilled onsite and coarse aggregates were extracted from the surface layer of the core samples. The morphological parameters of coarse aggregates were collected by a "backlighting photography" system and three-dimensional profilometer, and the variation rules of angularity and micro-texture of coarse aggregates were investigated. Finally, the correlation between the morphological characteristics of coarse aggregates and the pavement skid resistance was established based on the grey correlation entropy. The research results show that with the increase in service time, the attenuation rate of skid resistance of asphalt pavement gradually slows down; the angularity of coarse aggregates gradually decreases, and the micro-texture on the wearing surface gradually wears away. The grey correlation entropy between all the micro-texture indexes of coarse aggregates and dynamic friction coefficient, as well as between the roundness and skid resistance is more than 0.7, whereas the correlation between other evaluation indicators and the dynamic friction coefficient is poor, indicating that compared with the angularity of coarse aggregates, the micro-texture affects the skid resistance of actual asphalt pavement more greatly. In engineering applications, the use of coarse gradation, coarse aggregates with high roughness or high anti-wear performance can slow down the attenuation of pavement skid resistance, so that the pavement can maintain superior long-term anti-skidding performance.
本研究旨在基于现场调查，从粗集料角度提高沥青路面抗滑耐久性。首先，采用动态摩擦测试仪对六条典型实际道路的抗滑性能进行了为期两年的测试，并分析了不同类型沥青路面抗滑性能的衰减特性。其次，在现场钻取芯样，从芯样表层提取粗集料。通过“背光摄影”系统和三维轮廓仪采集粗集料的形态参数，研究粗集料棱角性和微观纹理的变化规律。最后，基于灰色关联熵建立粗集料形态特征与路面抗滑性能之间的相关性。研究结果表明，随着服役时间的增加，沥青路面抗滑性能的衰减速率逐渐减缓；粗集料棱角性逐渐降低，磨耗面微观纹理逐渐磨损。粗集料各微观纹理指标与动态摩擦系数之间以及圆润度与抗滑性能之间的灰色关联熵均大于0.7，而其他评价指标与动态摩擦系数之间的相关性较差，表明与粗集料棱角性相比，微观纹理对实际沥青路面抗滑性能的影响更大。在工程应用中，采用粗级配、粗糙度高或抗磨性能好的粗集料可减缓路面抗滑性能的衰减，使路面长期保持优异的抗滑性能。
