摘要
集料是微波加热沥青混合料自愈合的重要介质材料。本工作通过矢量网络分析试验、工业箱式微波炉微波加热试验及XRD、XRF分析,研究了石灰岩、玄武岩和钢渣三种集料的电磁参数、微波加热过程的加热响应以及集料粒径、钢渣掺量、化学成分和物相组成对集料传热性能的影响,并分析了集料与沥青混合料微波加热传热性能的关联性。结果表明,钢渣的电磁参数明显高于石灰岩和玄武岩,表明其电磁波吸收效果较好。相比石灰岩和玄武岩,钢渣因三氧化二铁含量较高,其微波加热传热性能更好。粒径、钢渣掺量和水分是影响集料微波加热传热性能的主要因素。随着粒径和钢渣掺量的增大,集料的传热性能呈增大趋势。相比干燥集料,含水率为0.3%~1.0%的集料微波加热升温速率均有所下降,降低幅度介于40%~50%。构建了不同含水率、钢渣掺量的集料微波加热表面温度与加热时间的线性关系方程,相关性系数R2均大于0.90,拟合效果良好。XRD和XRF分析表明,相比石灰岩和玄武岩,钢渣的活性金属化合物含量最高,微波加热的敏感性较好。微波加热试验表明,微波吸收能力由大到小依次为钢渣、钢渣沥青混合料、普通沥青混合料。钢渣微波加热传热性能优于钢渣沥青混合料和普通沥青混合料。
Aggregate is an important dielectric material for self-healing of asphalt mixture heated by microwave.The electromagnetic parameters of limestone,basalt and steel slag aggregates,the heating response of aggregates during microwave heating process and the effects of aggregate particle size,steel slag content,chemical composition and phase composition on the heat transfer performance of aggregates were studied by vector network analysis test,industrial box microwave oven microwave heating test,XRD and XRF analysis,and the correlation between aggregate and asphalt mixture microwave heating heat transfer performance was analyzed.The results show that the electromagnetic parameters of steel slag are significantly higher than those of limestone and basalt,indicating that its electromagnetic wave absorption effect is better.Compared with limestone and basalt,steel slag has better microwave heating heat transfer performance because of its high content of ferric oxide.Particle size,steel slag content and water content are the main factors affecting the heat transfer performance of aggregate by microwave heating.With the increase of particle size and steel slag content,the heat transfer performance of aggregate increases.Compared with dry aggregates,the microwave heating rate of aggregates with water content of 0.3%—1.0%decreased by 40%—50%.The linear relationship equation between surface temperature of aggregates with different water content and steel slag content and heating time under microwave heating has been constructed.The correlation coefficients are all greater than 0.90,and the fitting effect is good.XRD and XRF analysis show that compared with limestone and basalt,steel slag has the highest content of active metal compounds and better sensitivity to microwave heating.The microwave heating test shows that the decreasing order of microwave absorption capacity is steel slag,steel slag asphalt mixture and ordinary asphalt mixture.The heat transfer performance of steel slag heated by microwave is better than that
作者
张庆宇
罗京
赵毅
刘英
张新永
ZHANG Qingyu;LUO Jing;ZHAO Yi;LIU Ying;ZHANG Xinyong(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;National&Local Joint Engineering Laboratory of Traffic Civil Engineering Materials,Chongqing Jiaotong University,Chongqing 400074,China;School of Materials Science and Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Hebei Qiancao Expressway Development Co.,Ltd.,Tangshan 063200,Hebei,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2023年第8期58-65,共8页
Materials Reports
基金
河北省交通运输厅科技项目(QC2018-3)
重庆交通大学交通土建工程材料国家地方联合工程实验室开放基金项目(LHSYS-2021-002)
重庆市研究生联合培养基地建设项目(JDLHPYJD2021011)。
关键词
道路工程
集料
钢渣
微波加热
传热性能
road engineering
aggregate
steel slag
microwave heating
heating performance
