摘要
为了有效改善沥青超薄磨耗层路面的长期抗滑性能,本研究基于不同集料的差异性磨光,采用石灰岩与煅烧铝矾土集料混合掺配方案,制备了两种集料在不同混掺比例下的SMA-5超薄磨耗层沥青混合料(B-UTFC)。利用三轮磨耗仪对不同类型B-UTFC试件表面进行加速模拟磨耗试验,探究不同煅烧铝矾土掺配比例下的B-UTFC试件表面的摆值、动态摩擦系数以及纹理水平指标等抗滑特性随磨耗次数的衰减规律。结果表明:集料混掺型B-UTFC表面在长期磨耗过程中,产生了显著的差异磨光效果,由于不同集料间的“纹理构造差”可保持B-UTFC表面具有丰富的纹理结构,不仅有利于为轮胎-路面的相互作用提供足够的摩擦力,还能够有效降低抗滑性能衰减速率,显著提升B-UTFC的抗滑耐久性能;各项抗滑特性指标随磨耗次数增加呈现波动性变化并最终保持在良好水平,煅烧铝矾土合理掺配比例为沥青混合料矿料质量的40%~60%。研究结果为提高超薄磨耗层路面的长期抗滑性能提供了新方法。
To effectively improve the long-term skid resistance of asphalt ultra-thin friction course pavement,the study focuses on the differential polishing of aggregates.The blending scheme of limestone and calcined bauxite aggregates was employed to prepare SMA-5 bauxite ultra-thin friction course(B-UTFC)asphalt mixtures with different blending ratios of two aggregates.The three-wheel wearing apparatus was utilized to conduct accelerated simulated wearing tests on the surface of different types of B-UTFC specimens.The attenuation rule of skid-resistance characteristics(e.g.,the British Pendulum Number,dynamic friction coefficient,and texture level indicator)was explored to the wearing times on the surface of B-UTFC specimens with different calcined bauxite blending ratios.The result indicates that the surface of aggregates-blended B-UTFC can produce the significant differential-polishing effect during the long-term wearing process.The maintenance of rich texture structure on B-UTFC surface is made possible by the texture structure difference among different aggregates.It is beneficial for providing sufficient friction for tire-pavement interaction and effectively reducing the attenuation rate of skid-resistance,thereby significantly improving the skid-resistance durability of B-UTFC.The skid-resistance characteristic indicators fluctuate with wearing times and eventually remain at the good level.The reasonable blending ratio of calcined bauxite is found to be 40%-60%of asphalt mixture’s mineral mass.The findings of study provide the new method for improving the long-term skid resistance of UTFC pavement.
作者
曹东伟
郭清
毛利建
赵晓瑞
盛燕萍
CAO Dong-wei;GUO Qing;MAO Li-jian;ZHAO Xiao-rui;SHENG Yan-ping(China-Road Transportation of Verification&Inspection Hi-Tech Co.,Ltd.,Beijing 100088,China;School of Materials Science and Engineering,Chang'an University,Xi'an,Shaanxi 710064,China;Zhejiang Communications Investment Group Co.,Ltd.,Hangzhou,Zhejiang 310000,China;Design and Research Institute,CSCEC Road and Bridge Group Co.,Ltd.,Shijiazhuang,Hebei 050000,China)
出处
《公路交通科技》
CAS
CSCD
北大核心
2023年第S01期107-117,共11页
Journal of Highway and Transportation Research and Development
基金
中央引导地方科技发展资金项目(科技成果转移转化项目)(236Z1218G)
河北省交通运输厅科技项目(JD-202008)
关键词
道路工程
抗滑特性
混掺设计
超薄磨耗层
88煅烧铝矾土
沥青路面
road engineering
skid-resistance characteristics
blending design
ultra-thin friction course
calcined bauxite 88
asphalt pavement
