复合吸波材料对混凝土微波加热性能的影响  

Effect of Composite Absorbing Material on Microwave Heating Property of Concrete

作　　者：吴刚 陈伟 WU Gang;CHEN Wei(Jinan Huaiyin District Engineering Quality and Safety Center,Jinan 250021,China;School of Civil Engineering and Architecture,Ningbo Tech University,Ningbo 315100,China)

机构地区：[1]济南市槐荫区工程质量与安全中心,济南250021 [2]浙大宁波理工学院土木建筑工程学院,宁波315100

出　　处：《硅酸盐通报》2024年第1期128-137,共10页Bulletin of the Chinese Ceramic Society

基　　金：浙江省自然科学基金重点项目(LY20E080002)。

摘　　要：鉴于单一吸波材料对提高混凝土微波加热性能的局限性,本文将石墨粉和Fe_(3)O_(4)作为复合吸波材料掺入混凝土。通过力学性能测试,确定了复合吸波材料的合适掺量;通过微波加热试验,研究了复合吸波材料对混凝土微波加热性能的影响;通过电磁参数测试,分析了复合吸波材料的影响机理,并与单掺石墨粉、Fe_(3)O_(4)时进行了比较分析。结果表明,石墨粉和Fe_(3)O_(4)的掺入均会降低混凝土的力学性能,吸波材料的掺量不宜超过6%(质量分数)。随着石墨粉、Fe_(3)O_(4)单掺掺量的增大,混凝土的微波加热性能不断增大。当石墨粉和Fe_(3)O_(4)复掺时,混凝土的微波加热性能更佳,最佳复掺比例为m(石墨粉)∶m(Fe_(3)O_(4))=2∶1;混凝土的复介电常数、介电损耗角正切、复磁导率和磁损耗角正切均显著增大,介电损耗能力和磁损耗能力同时显著提高。In view of the limitation of a single absorbing material to improve the microwave heating property of concrete,graphite powder and Fe_(3)O_(4) were incorporated into concrete as composite absorbing material.The appropriate content of the composite absorbing material was determined by mechanical properties test.The effect of composite absorbing material on microwave heating property of concrete was studied by microwave heating test.The influence mechanism of the composite absorbing material was analyzed by electromagnetic parameter test.Meanwhile,the results were compared with those of the separate addition of graphite powder and Fe_(3)O_(4).The results show that the addition of graphite powder and Fe_(3)O_(4) can reduce the mechanical properties of concrete,and the content of absorbing material should not exceed 6%(mass fraction).The microwave heating property of concrete increases with the increase of separate addition of graphite powder and Fe_(3)O_(4).When graphite powder and Fe_(3)O_(4) are incorporated,the microwave heating property of concrete is better,and the best mix ratio is m(graphite powder)∶m(Fe_(3)O_(4))=2∶1.When graphite powder and Fe_(3)O_(4) are incorporated,the complex permittivity,dielectric loss angle tangent,complex permeability and magnetic loss angle tangent of concrete significantly increase,and the dielectric loss capacity and magnetic loss capacity significantly increase at the same time.

关 键 词：混凝土 石墨粉 Fe_(3)O_(4) 微波加热 介电损耗 磁损耗 

分 类 号：TU528[建筑科学—建筑技术科学]