宏纳观多尺度集料-沥青粘附性评价  

Evaluation of Adhesion Between Aggregate and Asphalt Binder in Multi-scale

作　　者：虞将苗 周文理 YU Jiangmiao;ZHOU Wenli(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学土木与交通学院,广州510640

出　　处：《材料导报》2021年第2期2052-2056,共5页Materials Reports

基　　金：国家自然科学基金(51678251)。

摘　　要：集料-沥青的粘附性能作为沥青混合料路用性能的重要指标之一,对道路的耐久性有着重要影响。集料-沥青粘附性受多种因素共同影响。为探究集料的内在成分对集料-沥青粘附性的影响,对原子力显微镜(AFM)的探针针尖进行改造和修饰。采用道路工程在建项目附属石场的集料,提取集料中主要化合物成分制成小球针尖并对沥青表面进行粘附力测定;同时,结合荧光光谱仪(XRF)分析与拉拔试验,探究集料成分对集料-沥青粘附性的影响,并进行综合评价。结果表明,沥青-集料的粘附作用包括物理吸附和化学吸附,Al 2O 3在宏纳观尺度与沥青都有着较大的粘附作用;纳观尺度测定的结果表明,SiO 2与沥青之间有着较强的粘附力,而CaCO 3与沥青之间的粘附力较弱。宏观尺度测定结果表明,化学吸附对集料-沥青的粘附作用有着更强的影响,且碱性集料与沥青之间有着较强的抗水损害能力。本工作针对道路工程集料筛选给出了基于粘附性评价的建议,具有一定的指导意义。The adhesion force between aggregate and asphalt binder is one of the important indicators of asphalt mixture performance,which has important effect on the durability of the road.The adhesion force between aggregate is influenced by many factors.In order to investigate the inf-luence of the inherent components of the aggregate on the adhesion force between aggregate and asphalt binder,the probe tip of the atomic force microscope(AFM)was modified:use the main compounds in aggregate to make small ball probe tips so as to measure the adhesion of the asphalt surface.Obtaining aggregates from the quarry attached to the road engineering project under construction,combined with X-ray fluorescence spectrometer(XRF)analysis and macro MTS pull-out test to investigate the effect of aggregate composition on aggregate-asphalt adhesion and conduct a comprehensive evaluation.The conclusion indicates that the adhesion between aggregate and asphalt binder includes physical adsorption and chemical adsorption.Large adhesion force occurs between Al 2O 3 and asphalt binder,the results measured at the nano level show that there is a strong intermolecular attraction between SiO 2 and asphalt binder,while the intermolecular attraction between CaCO 3 and asphalt binder is weak.The macro-level measurement results show that chemisorption has a stronger effect on the adhesion between aggregate and asphalt binder and the alkaline aggregate combined with asphalt binder have a stronger ability to resist water damage.The result has certain guiding significance of aggregate screening in road engineering.

关 键 词：沥青 原子力探针显微镜(AFM) 粘附力 拉拔试验 

分 类 号：U414[交通运输工程—道路与铁道工程]