摘要
铁尾矿作为一种新材料加入沥青会产生新的界面,其与沥青的界面黏附性直接影响沥青混合料的路用性能。为揭示铁尾矿-沥青界面黏附的作用机理,通过X射线荧光光谱仪、X射线衍射仪、扫描电子显微镜等对铁尾矿砂的化学组成和微观形貌进行分析,运用改进的煮沸试验对沥青在铁尾矿表面的黏附率进行定量分析,并利用分子动力学模拟计算铁尾矿-沥青界面的黏附能,最后基于灰色关联法分析微观测试结果与宏观黏附率的关联度。结果表明:铁尾矿砂、石灰岩和玄武岩的主要化学成分、矿物组成差异较大,铁尾矿砂金属氧化物含量较高,表面存在金属光泽,棱角丰富,铁尾矿与沥青的界面黏附能及沥青在铁尾矿表面的黏附率介于石灰岩和玄武岩之间,微观测试结果与宏观黏附率的关联度排序(从大到小)为表观形貌、CaO+MgO含量、钠长石含量、界面黏附能,可见此铁尾矿与沥青黏附性较好,满足工程要求。研究结果可为铁尾矿在沥青面层的应用奠定基础。
As a new material,the addition of iron tailings to asphalt will produce a new interface,and its interface adhesivity with asphalt directly affects the road performance of asphalt mixture.In order to reveal the adhesion mechanism of iron tailings-asphalt interface,the chemical composition and microstructure of iron tailings sand were analyzed by X-ray fluorescence spectrometer,X-ray diffractometer and scanning electron microscope.The adhesion rate of asphalt on the surface of iron tailings was quantitatively analyzed by improved boiling test,and the adhesion energy of iron tailings-asphalt interface was calculated by molecular dynamics simulation.Finally,the correlation degree between microscopic test results and macroscopic adhesion rate was analyzed based on grey correlation method.The results show that the main chemical composition and mineral composition of iron tailings sand,limestone and basalt are quite different.The content of metal oxide in iron tailings sand is higher,the surface has metal luster,rich edges and corners.The interface adhesion energy between iron tailings and asphalt,the adhesion rate of asphalt on the surface of iron tailings are between those of limestone and basalt.The correlation degree between the microscopic test results and the macroscopic adhesion rate(from large to small)is the apparent morphology,CaO+MgO content,albite content,and interface adhesion energy.It can be seen that the iron tailings have a good adhesivity with asphalt and meet the engineering requirements.The research results can lay a foundation for the application of iron tailings in asphalt surface layer.
作者
崔亚宁
司春棣
李松
郭彬
崔巧萱
CUI Yaning;SI Chundi;LI Song;GUO Bin;CUI Qiaoxuan(School of Traffic and Transportation,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Hebei Provincial Key Laboratory of Traffic Safety and Control,Shijiazhuang 050043,China;State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang 050043,China)
出处
《金属矿山》
CAS
北大核心
2024年第6期261-266,共6页
Metal Mine
基金
国家自然科学基金项目(编号:52378455)
河北省重点研发计划项目(编号:21373801D)
河北省自然科学基金项目(编号:E2022210054)。
关键词
铁尾矿砂
沥青
黏附性
微观实验
煮沸实验
灰色关联分析
iron tailings sand
asphalt
adhesivity
microscopic experiment
boiling experiment
grey correlation analysis
