纳米碳纤维增强混凝土的介电特性  

Dielectric properties of nano-carbon fiber reinforced concrete

作　　者：王志航 许金余[1,2] 吴云泉 黄哲 任彪 聂良学 WANG Zhihang;XU Jinyu;WU Yunquan;HUANG Zhe;REN Biao;NIE Liangxue(School of Aeronautical Engineering, Air Force Engineering University, Xi'an 710038, P. R. China;College of Mechanics and Civil Architecture, Northwest Polytechnic University, Xi'an 710072, P. R. China;Air Force Guangzhou Engineering Design Office, Guangzhou 510045, P. R. China)

机构地区：[1]空军工程大学航空工程学院,西安710038 [2]西北工业大学力学与土木建筑学院,西安710072 [3]空军广州工程设计室,广州510045

出　　处：《土木与环境工程学报（中英文）》2022年第1期134-141,共8页Journal of Civil and Environmental Engineering

基　　金：国家自然科学基金(51208507、51378497)。

摘　　要：为研究纳米碳纤维增强混凝土的介电特性,发现纳米碳纤维增强混凝土对电磁波的反射与损耗规律,采用波导法测试纤维掺量为0、0.1%、0.2%、0.3%、0.5%的纳米碳纤维增强混凝土在1.7~2.6 GHz频率范围内的介电常数。分别从相对复介电常数实部、相对复介电常数虚部、损耗角正切等方面分析了纤维掺量、频率对纳米碳纤维增强混凝土介电特性的影响,并对比分析0.3%纤维掺量下纳米碳纤维和普通碳纤维对混凝土材料介电特性的影响。结果表明:纳米碳纤维的掺加提高了混凝土材料相对复介电常数实部和虚部、损耗角正切,增强了混凝土材料对电磁波的损耗能力;纤维掺量越大,纳米碳纤维增强混凝土介电特性越强,对电磁波的损耗能力越大;纳米碳纤维对混凝土材料介电特性的提高效果强于碳纤维。In order to study the dielectric properties of nano-carbon fiber-reinforced concrete,and find the law of reflection and loss of nano-carbon fiber-reinforced concrete to electromagnetic waves,the waveguide method was used to test the dielectric properties of nano-carbon fiber reinforced concrete with a fiber content of 0,0.1%,0.2%,0.3%,0.5%in the frequency range of 1.7 GHz to 2.6 GHz constant.The effects of fiber content and frequency on the dielectric properties of nano-carbon fiber-reinforced concrete were analyzed from the aspects of relative dielectric constant real part,imaginary part and loss tangent.At the same time,the effects of nano-carbon fiber and ordinary carbon fiber on the dielectric properties of concrete materials with 0.3%fiber content were compared and analyzed.The test results show that:nano-carbon fiber can increase the real part and imaginary part of the complex dielectric constant and loss tangent of the concrete material,and enhance the loss ability of the concrete material to electromagnetic waves;the greater the amount of nano-carbon fiber,the stronger the dielectric properties of nano-carbon fiber-reinforced concrete and the greater the loss of electromagnetic waves;the effect of nano-carbon fibers on the improvement of the dielectric properties of concrete materials is stronger than carbon fibers.

关 键 词：纳米碳纤维 混凝土 介电常数 电磁波损耗 

分 类 号：TU528.572[建筑科学—建筑技术科学]