scholarly journals Comparative Study on Microwave Absorbing Heating Characteristics and Microwave Deicing Performance of Airport Pavement Modified Concrete

2021 ◽  
Author(s):  
He Huang ◽  
Jinyu Xu ◽  
Junliang Liu ◽  
Haowen Chen
Keyword(s):  
Mechanical Properties ◽  
Practical Significance ◽  
Weak Links ◽  
Main Research ◽  
Airport Pavement ◽  
Microwave Effect ◽  
Absorbing Materials ◽  
Absorbing Material ◽  
Microwave Absorbing ◽  
Pavement Concrete

Abstract In this paper, the airport pavement concrete has been taken as the main research object, three kinds of absorbing materials, namely silicon carbide (SiC), iron oxide (Fe3O4) and graphite, have been respectively mixed into the concrete, and an open microwave testing system has been established. Based on this system, the basic mechanical properties, microwave heating characteristics, microwave deicing effect and its influencing factors of modified concrete are systematically studied. In addition, a comparative analysis of the influence mechanism of different absorbing materials on the strength and absorbing performance of pavement concrete is carried out. The results showed that the addition of SiC, Fe3O4, and graphite could effectively enhance the microwave effect of pavement concrete, and the more the addition, the more obvious the improvement. Furthermore, under the same mixing amount, the degree of improvement of microwave deicing performance of each absorbing material from large to small is graphite, Fe3O4, SiC. However, the addition of graphite will form several weak links in concrete, thereby reducing its overall mechanical properties. SiC can slightly improve the mechanical properties of pavement concrete, but it has no significant effect on the microwave absorption properties. With the addition of Fe3O4, the strength of concrete changes little, and the effect of microwave absorbing heating and microwave deicing is remarkable. In general, the comprehensive performance of microwave deicing of Fe3O4 modified concrete is optimal. This study has high scientific and practical significance, and can be widely applied to deicing projects on airports and high-grade highways.

Study on Performance about Hybrid Fiber Concrete of Airport Pavement

2014 ◽  
Vol 1065-1069 ◽  
pp. 706-709 ◽  
Author(s):  
Xiao Jun Liu ◽  
Che Fei Zhu ◽  
Yong Gen Wu ◽  
Qing Tao Liu
Keyword(s):  
Mechanical Properties ◽  
Steel Fiber ◽  
Volume Fraction ◽  
Orthogonal Experiment ◽  
Basalt Fiber ◽  
Fiber Reinforced Concrete ◽  
Hybrid Fiber ◽  
Airport Pavement ◽  
Fiber Concrete ◽  
Pavement Concrete

In order to meet the requirements of the use of aircraft, improve mechanical properties of pavement concrete, the steel fiber mixed basalt hybrid fiber reinforced concrete technical route was proposed, by using the method of orthogonal experiment, steel fiber with 1.2%,1.5%,1.8% these 3 volume fraction and basalt fiber in 0.05%,0.1%,0.15% these 3 volume fraction mixed, research the rules of its effect on the performance of airport pavement concrete.

scholarly journals Preparation and Characterization of High Magnetic Loss Microwave Absorber for Splitter Load

2020 ◽  
Vol 186 ◽  
pp. 03006
Author(s):  
Lan Tian ◽  
Dong Lichao ◽  
Li Nan ◽  
Zhang Chunbo ◽  
Zhang Hao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Iron Powder ◽  
Carbonyl Iron ◽  
Mechanical Performance ◽  
Magnetic Loss ◽  
Microwave Absorber ◽  
Electromagnetic Properties ◽  
Carbonyl Iron Powder ◽  
Absorbing Material ◽  
Microwave Absorbing

Microwave absorbing material was prepared using epoxy resin as matrix and spherical carbonyl iron powder (s-CIP), flaky carbonyl iron powder (f-CIP) as absorbing agent. Microwave absorbing, mechanical properties and structure of the composites containing different kinds of carbonyl iron powder (CIP) were investigated. The results show that the microwave absorber with flaky CIP have better electromagnetic properties than composites with spherical CIP. With concentration of spherical CIP increasing the electromagnetic properties of composites becomes better, except for the mechanical performance. The flaky CIP/epoxy resins composites with a loading of 79 wt% plate-like CIP has attenuation constant of 25.443 dB/cm in 3 GHz. The absorber prepared using flaky CIP has homogenous, dense structure and has excellent mechanical properties.

Analysis and Design of Transparent Microwave Absorbing Materials Based on the Destructive Interference at the Microwave Range

2014 ◽  
Vol 887-888 ◽  
pp. 432-436 ◽  
Author(s):  
Yi Ye ◽  
Li Xin Song ◽  
Xiang Lian Song ◽  
Tao Zhang
Keyword(s):  
Destructive Interference ◽  
Microwave Range ◽  
Interference Theory ◽  
Interference Phenomenon ◽  
Analysis And Design ◽  
Microwave Absorbing Materials ◽  
Absorbing Materials ◽  
Optically Transparent ◽  
Absorbing Material ◽  
Microwave Absorbing

An optically transparent microwave absorbing material based on the destructive interference theory was studied in this paper. The destructive interference phenomenon has been discussed and verified in the transparent microwave absorbing material. According to the destructive interference theory, we designed a type of three-layer microwave absorbing structure to enlarge the absorbing bandwidth. And its reflection coefficient curve stays below -10dB in the range of 7.5GHZ to 17.0GHz.

Microwave absorption properties of rare earth alloy Nd2Co17@C/Na2SiO3 composite at elevated temperature (293–723 K) in X band

2021 ◽  
Author(s):  
yang zou ◽  
Zhao hui Qi ◽  
Zuying Zheng ◽  
Donglin He ◽  
Guowu Wang ◽  
...  
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
Raw Material ◽  
Absorption Properties ◽  
Rare Earth Alloy ◽  
X Band ◽  
Absorbing Materials ◽  
Before And After ◽  
Absorbing Material ◽  
Microwave Absorbing

Abstract A variety of new challenges are being faced in the development of high temperature microwave absorbing materials in the X band. Recently, some of the 2:17 phase rare-earth soft magnetic alloys with high permeability and curie temperature have potential to be a novel X band high temperature microwave absorbing material. In this paper, a high temperature microwave absorbing material (Nd2Co17@C/Na2SiO3) is prepared with Nd2Co17 as a raw material. After carbon cladding and Na2SiO3 treatment, the composite can work stably at 723 K. The calculated absorption properties display that the reflection loss (RL) intensity of the composite with a thickness of 1.5 mm is below -6 dB in the whole X band. Moreover, the thermogravimetric (TG) analysis results and static magnetic properties before and after sintering indicate that the material has excellent resistance to oxidation. Rare earth alloy materials provide a new possibility for the research of innovative high temperature absorbing materials.

Study of Rheological Properties of Modified Concrete Mixtures at Vibration

2019 ◽  
Vol 968 ◽  
pp. 96-106
Author(s):  
Oleksandr Pshinko ◽  
Olena Hromova ◽  
Dmytro Rudenko
Keyword(s):  
Mechanical Properties ◽  
Rheological Properties ◽  
Physical Nature ◽  
Concrete Mixture ◽  
Practical Significance ◽  
Vibration Displacement ◽  
Concrete Mixtures ◽  
Variable Quantity ◽  
Vibration Compaction ◽  
Mechanism Of Interaction

Study of rheological properties of concrete mixtures based on modified cement systems in order to determine process parameters. Methodology. To study structural-mechanical properties of modified concrete mixtures of different consistency at their horizontal vibrating displacement an oscillatory viscometer was designed. Results. The optimization of the process of vibration displacement of concrete mixtures with the specification of parameters of vibration impacts taking into account structural-mechanical properties of the mixture is performed. It has been established that the viscosity of the modified cement system of the concrete mixture is a variable quantity, which depends on the parameters of the vibration impacts. Scientific novelty. The mechanism of interaction of the modified concrete mixture with the form and the table vibrator during its vibration compaction is determined. On the basis of this, a model of concrete laying process control is proposed, that allows to predict the ability to form a dense concrete structure. Practical significance. Disclosed physical nature of the process of vibrating displacement of modified concrete mixtures using the principles of physical-chemical mechanics of concrete allows reasonably choose the best options for vibration impacts.

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