掺天然磁铁矿粉沥青混合料电磁波吸收性能  

Electromagnetic Wave Absorbing Properties of Asphalt Mixture with Natural Magnetite Powder

作　　者：关博文[1] 杨涛[1] 熊锐[1] 王永维[1] 

机构地区：[1]长安大学交通铺面材料教育部工程研究中心,陕西西安710061

出　　处：《建筑材料学报》2016年第1期198-203,共6页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51308062);中国博士后科学基金资助项目(2013M540726);中央高校基本科研业务费专项资金资助项目(2014G1311084)

摘　　要：为提高沥青路面电磁波吸收能力,以天然磁铁矿粉为吸收剂制备了沥青混合料试样,采用矩形波导法测试了不同天然磁铁矿粉取代率下试样的电磁参数（复介电常数与复磁导率）,并基于传输线理论计算了掺天然磁铁矿粉沥青路面的反射损耗.结果表明：随天然磁铁矿粉品位与取代率的增加,试样复介电常数实部明显增大,虚部变化不大;试样复磁导率实部与虚部都随天然磁铁矿粉品位与取代率的增加而增大.品位60以上的天然磁铁矿粉均能制备出电磁波反射损耗小于-10dB的沥青混合料.掺天然磁铁矿粉沥青混合料在其厚度为2～11cm时存在3个匹配厚度（3,5,7cm）,结合路面工程要求与经济性,掺天然磁铁矿粉吸波沥青路面上面层设计厚度合理建议值为3cm.路面上面层设计厚度大于3cm时,可适当降低天然磁铁矿粉取代率.In order to improve electromagnetic wave absorbing properties of asphalt pavement,the asphalt mixture samples were prepared using natural magnetite powder as absorber.The electromagnetic parameters such as complex dielectric constant and complex magnetic permeability of samples with different replacement rates of natural magnetite powder were tested by the method of rectangular waveguide.Reflection loss of samples were calculated based on the transmission line and impedance theory.Results show that with addition of natural magnetite powder,electromagnetic parameters of asphalt mixture are improved significantly.With the increasing grade and increasing replacement rate of natural magnetite powder,the real part of the complex dielectric constant is significantly increased while the imaginary part has little change.Both the real and imaginary parts of complex magnetic permeability are increased with the increasing grade and increasing replacement rate of natural magnetite powder.Asphalt pavement with reflection loss of less than-10 dB can be prepared by adding natural magnetite powder in grade of 60 and above.There are three kinds of matching thickness（3,5,7cm）of electromagnetic wave absorbing asphalt pavement during 2-11 cm.The recommended design value of asphalt pavement thickness is 3cm.When the designed thickness of pavement layer is higher than 3cm,the lower replacement rate of natural magnetite powder should be selected.

关 键 词：道路工程 沥青混合料 天然磁铁矿粉 电磁波吸收 

分 类 号：U414[交通运输工程—道路与铁道工程]