碳化硅粉填充沥青混合料微波自愈合性能及合理掺量  

Microwave Self-healing Properties and Reasonable Content of Silicon Carbide Powder Filled Asphalt Mixtures

作　　者：唐杰 赵华 高红成 TANG Jie;ZHAO Hua;GAO Hongcheng(School of Infrastructure Engineering,Nanchang University,Nanchang 330031,China;School of Transportation Science and Engineering,Harbin Institute of Technology,Harbin 150090,China;CCCC Second Harbor Engineering Company Ltd.,Wuhan 430040,China)

机构地区：[1]南昌大学工程建设学院,南昌330031 [2]哈尔滨工业大学交通科学与工程学院,哈尔滨150090 [3]中交第二航务工程局有限公司,武汉430040

出　　处：《材料导报》2024年第20期97-106,共10页Materials Reports

基　　金：国家自然科学基金(52168062)。

摘　　要：传统沥青混合料吸波升温性能差,限制了微波养护技术在路面工程中的应用。本工作引用理化性质稳定的碳化硅粉作为矿粉填料的替代品掺入沥青混合料中以增强其微波吸收能力,加速微波加热下混合料的宏观裂纹愈合。设计了不同碳化硅等体积替换矿粉比例(0%、10%、20%、30%、40%、50%、60%)的AC-13沥青混合料,确定不同替换比下混合料的最佳油石比,并检测其路用性能;基于断裂-愈合-断裂试验和微波加热试验,将断裂峰值力恢复率作为愈合指数,评价沥青混合料的微波自愈合能力;采用灰色关联分析法提出了碳化硅合理替换掺量。结果表明:填料及沥青胶浆的微观特性对沥青混合料宏观性能的影响显著,碳化硅粉的掺入可增强沥青混合料的力学性能和高温稳定性,且它们随碳化硅替换比例增大而呈现抛物线变化趋势;但碳化硅粉对沥青混合料的水稳定性有不利影响。随着碳化硅替换比例增大,沥青混合料的升温速率和愈合指数增大,且不同碳化硅替换比的沥青混合料存在最佳微波加热时间;吸波剂以填料形式掺入沥青混合料中,吸波升温更加均匀。灰色关联分析结果显示碳化硅粉填充沥青混合料的合理替换比为30%~40%。The traditional asphalt mixture has poor microwave absorption performance,which limits the application of microwave maintenance technology in pavement engineering.In this work,in order to enhance the microwave absorption capacity,silicon carbide powder with stable physicochemical properties is cited as a substitute for mineral powder filler incorporated into asphalt mixtures,accelerating the macroscopic crack healing of mixtures under microwave heating.AC-13 asphalt mixes with different silicon carbide equal volume replacement of mineral powder(0%,10%,20%,30%,40%,50%,60%)were designed.The optimum asphalt content of the different types of mixtures were determined and tested for their road performance.The microwave self-healing capability of asphalt mixtures was evaluated by fracture-healing-fracture test and microwave hea-ting test based on the peak fracture force recovery rate as a healing index.Gray correlation analysis was used to propose a reasonable replacement doping of silicon carbide.The results show that the microscopic properties of fillers and asphalt mastics have significant influence on the macroscopic properties of asphalt mixtures.The incorporation of silicon carbide powder can enhance the mechanical properties and high temperature stability of asphalt mixtures,and shows a parabolic trend with the increase of silicon carbide replacement ratio.However,it has an unfavo-rable effect on the water stability of asphalt mixtures.As the silicon carbide replacement ratio increases,the warming rate and healing index also increase,and the optimal microwave heating time exists for asphalt mixtures with different silicon carbide replacement ratios.The microwave absorber is incorporated into the asphalt mixture in the form of filler,which makes the wave-absorbing warming more uniform.Gray correlation analysis shows that the reasonable replacement ratio of silicon carbide powder filled asphalt mixtures is 30%to 40%.

关 键 词：道路工程 沥青混合料 微波加热 自愈合 路用性能 升温行为 

分 类 号：U414[交通运输工程—道路与铁道工程]