Research on Electromagnetic Field Optimization for Microwave Hot Recycling of Asphalt Mixtures

2012 ◽  
Vol 462 ◽  
pp. 575-579 ◽  
Author(s):  
Tong Sheng Sun ◽  
Zhi Sheng Zhang ◽  
Ling Feng Tang
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Energy Distribution ◽  
Microwave Heating ◽  
Field Experiments ◽  
Heating System ◽  
Asphalt Mixtures ◽  
Electromagnetic Propagation ◽  
Recycled Asphalt ◽  
Electromagnetic Model

In order to investigate the law of electromagnetic propagation within microwave heating system, Maxwell's equations are applied to build electromagnetic model of recycled asphalt mixtures. Energy distribution of electromagnetic field in asphalt mixtures is researched based on the Poynting theory. The optimization model of electromagnetic field and structure are established by building relationship between electric field and magnetic field. Experiments of microwave heating allochroic silicagel are performed, which demonstrates the accuracy of electromagnetic field optimization.

Research on Key Electromagnetic Model for Microwave Hot Recycling of Asphalt Mixtures

2013 ◽  
Vol 312 ◽  
pp. 354-357 ◽  
Author(s):  
Tong Sheng Sun
Keyword(s):  
Electromagnetic Field ◽  
Theoretical Foundation ◽  
Asphalt Mixtures ◽  
Transmission Model ◽  
Recycled Asphalt ◽  
Heating Efficiency ◽  
Pavement Materials ◽  
Electromagnetic Model ◽  
Reflection And Refraction ◽  
Electromagnetic Transmission

For uneven temperature distribution of infrared hot recycling of asphalt mixtures, principle and advantage of microwave hot recycling are introduced. Maxwell's equations are applied to build electromagnetic transmission model of recycled asphalt mixtures. Considering asphalt mixtures as dielectric substance, reflection and refraction of electromagnetic field are researched and model of standing wave ratio is built. Equation of magnetic attenuation is applied to contrast attenuation depths of different pavement materials. The results lay a good theoretical foundation to improve heating efficiency and choose pavement materials.

scholarly journals Electromagnetic Field Shielding in Incubators

2021 ◽  
Author(s):  
Seyed Amin Hashemi ◽  
Afsane Bazzi ◽  
Ahmad Cheldavi ◽  
Seyed Mehrdad Saviz
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Numerical Evaluation ◽  
Heating System ◽  
Co2 Exchange ◽  
Considerable Decrease ◽  
Practical Design

Purpose: Cell experiments are vitally dependent on CO2 incubators. The heating system of usual incubators result in undesirable induction of Electromagnetic (EM) fields on cells that result in decreased accuracy in bio-electromagnetic tests. EM shields can cause a considerable decrease in the stray fields and eliminate the undesirable induction. Materials and Methods: CST-2019 is used for simulations. five different shielding systems have been examined in this paper. We try to modify shape and material used for shielding to achieve better result. (Iron, Mu-Metal, steel). Results: We introduce a simple practical design, together with variations of previously reported ones, and numerical evaluation of their magnetic field attenuation. Conclusion: The targeted design decreases the field within the shield to about 0.03 times of the incident magnetic field, while having holes for air and CO2 exchange.

scholarly journals Self-Healing Analysis of Half-Warm Asphalt Mixes Containing Electric Arc Furnace (EAF) Slag and Reclaimed Asphalt Pavement (RAP) Using a Novel Thermomechanical Healing Treatment

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2502 ◽  
Author(s):  
José Manuel Lizárraga ◽  
Juan Gallego
Keyword(s):  
Mechanical Properties ◽  
Microwave Heating ◽  
Asphalt Pavement ◽  
Electric Arc ◽  
Asphalt Mixtures ◽  
Self Healing ◽  
Arc Furnace ◽  
Recycled Asphalt ◽  
Indirect Tensile ◽  
Eaf Slag

Nowadays, the self-healing of asphalt pavements promoted by microwave radiation heating energy is gaining attention and strength in the scientific community. However, most of these studies are only conceptual and, thus, remain shrouded in uncertainty regarding technology development, economy, and application effect. Therefore, there are several efforts underway to offer more effective assisted healing treatments that are capable of overcoming such uncertainties. This paper aims to assess and quantify the healing performance rates (HR) of half-warm recycled asphalt (HWRA) mixtures containing electric arc furnace (EAF) slag and total recycled asphalt pavement (RAP) rates. To this end, a novel assisted thermomechanical healing treatment (i.e., a recompaction-based technique and microwave heating energy) was put forward to promote the potential healing effect of this treatment on the mechanical properties of the asphalt mixtures. In order to do this, three microwave heating temperatures (25 °C, 60 °C, and 80 °C) and three mechanical recompaction levels (0, 25, and 50 gyrations) were selected. After that, the healing performance rates (%, HR) of the asphalt mixtures were calculated by repeated indirect tensile strength (ITS) and indirect tensile stiffness modulus (ITSM). The results indicated that the 8% EAF slag mixture was found to provide significant microwave heating energy savings by up to 69% compared with the benchmark 100% RAP mixture, and, at the same time, it experienced a remarkable stiffness recovery response of 140% of the initial mechanical properties. These findings encourage greater confidence in promoting this innovative thermomechanical-based healing treatment for in-situ surface course asphalt mixtures of road pavements.

The Study on the Uniform Drying of Microwave Heating System with Multiple Waveguides

2013 ◽  
Vol 329 ◽  
pp. 219-223 ◽  
Author(s):  
Woo Seong Che ◽  
Jun Ma
Keyword(s):  
Electromagnetic Field ◽  
Objective Function ◽  
Microwave Heating ◽  
Heating System ◽  
Temperature Uniformity ◽  
Uniform Temperature ◽  
Heating Method ◽  
Uniform Electromagnetic Field ◽  
Parallel Type

Microwave heating is an important heating method that is widely used in industries. Developing a uniform electromagnetic field inside the cavities might be a crucial challenge to avoid localized overheating. The uniformity of the electromagnetic field is governed by the configurations of the waveguides. To better understand the design of cavities, the simulations are carried out. This paper discussed the comparison in result between two configurations of waveguides and introduced the use of uniformity objective function in order to evaluate the temperature uniformity. As conclusion, it was found out that using the perpendicular type of waveguides had better uniform temperature than using the parallel type.

Usefulness of Foundry Tooling Materials in Microwave Heating Process

2013 ◽  
Vol 58 (3) ◽  
pp. 919-922 ◽  
Author(s):  
K. Granat ◽  
B. Opyd ◽  
D. Nowak ◽  
M. Stachowicz ◽  
G. Jaworski
Keyword(s):  
Electromagnetic Field ◽  
Microwave Heating ◽  
Loss Factor ◽  
Perturbation Technique ◽  
Resonant Cavity ◽  
Precise Determination ◽  
Heating Process ◽  
Basic Criterion ◽  
Measurement Results ◽  
Heating Technology

Abstract The paper describes preliminary examinations on establishing usefulness criteria of foundry tooling materials in the microwave heating technology. Presented are measurement results of permittivity and loss tangent that determine behaviour of the materials in electromagnetic field. The measurements were carried-out in a waveguide resonant cavity that permits precise determination the above-mentioned parameters by perturbation technique. Examined were five different materials designed for use in foundry tooling. Determined was the loss factor that permits evaluating usefulness of materials in microwave heating technology. It was demonstrated that the selected plastics meet the basic criterion that is transparency for electromagnetic radiation.

Low-temperature performance of recycled asphalt mixtures under static and oscillatory loading

2016 ◽  
Vol 18 (2) ◽  
pp. 297-314 ◽  
Author(s):  
Ki Hoon Moon ◽  
Augusto Cannone Falchetto ◽  
Di Wang ◽  
Michael P. Wistuba ◽  
Gabriele Tebaldi
Keyword(s):  
Low Temperature ◽  
Asphalt Mixtures ◽  
Recycled Asphalt ◽  
Temperature Performance ◽  
Low Temperature Performance
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