An Exploration to Develop Concrete Walls Using MnxZn1-xFe2O4 Ferrite as Absorbing Material to Provide Defense against Electromagnetic Pollution

2013 ◽  
Vol 315 ◽  
pp. 924-928 ◽  
Author(s):  
See Khee Yee ◽  
Sia Chee Kiong ◽  
Zarar bin Mohd Jenu Mohd
Keyword(s):  
Parallel Plate ◽  
Building Materials ◽  
Electrical Characteristic ◽  
Shielding Effectiveness ◽  
Concrete Walls ◽  
Disastrous Consequence ◽  
Grain Sizes ◽  
Absorbing Material ◽  
Mixture Volume ◽  
Electromagnetic Pollution

Concern regarding the shielding effectiveness (SE) of building materials is gaining more response nowadays due to the awareness on the electromagnetic pollution (EMP) that is believed to results in disastrous consequence. A pure concrete inherently providing certain level of SE but it is not enough. Hence additional shielding and absorbing additives are added into the concrete. In this work MnxZn1-xFe2O4will be added into the pure concrete to enhance its SE performance. The effect of microstructure, compositions, grain sizes, homogeneity, mixture volume of the MnxZn1-xFe2O4will be considered for the optimization in this mixture. The key component to determine the SE of concrete is their electrical characteristic (relative permittivity and relative permeability). The parallel plate which is proposed previously will be used to determine the electrical characteristic of material and it will also be used for SE measurement.

Simulation of Various Wall and Window Glass Material for Energy Efficient Building Design

2016 ◽  
Vol 692 ◽  
pp. 9-16 ◽  
Author(s):  
Kiran Kumar Gorantla ◽  
Saboor Shaik ◽  
Ashok Babu Talanki Puttaranga Settee
Keyword(s):  
Energy Efficient ◽  
Building Materials ◽  
Window Glass ◽  
Building Design ◽  
Point Of View ◽  
Heat Gain ◽  
Concrete Walls ◽  
Building Models ◽  
Clear Glass ◽  
Reinforced Cement

Buildings consume huge amount of energy for forced ventilation and artificial day lighting. Use of appropriate material combinations for walls and window glass can help in reducing energy consumption for cooling and lighting. This paper presents the thermal properties of four building materials such as, laterite stone, dense concrete, burnt brick and mud brick. It also presents the experimentally measured optical properties of glass materials such as, clear glass, bronze glass, green glass and reflective. In this study building of size 5m X 5m X 3.2m with four wall materials and four glass materials were designed using design builder software. The thickness of the wall was considered as external wall with thickness 0.22m. All the walls covered with cement plaster on either side. Roof of the building is made of reinforced cement concrete and floor is dense concrete. Thermal analysis was carried out using by Energy plus software. Single sized glass windows were placed in south direction (Due to less heat gain in south direction) for Mangalore city (12.870N, 74.880E), Karnataka, India. Different window to wall ratios (20%, 40%, 60%, 80% and 100%) were maintained for buildings. Total eighty building models were investigated for heat gain into buildings. From the results, it is observed that irrespective of the window to wall ratio, mud brick walls with reflective window glass were observed to be energy efficient from the lower heat gain point of view, and laterite stone wall building with clear glass windows were observed to be the worst due to their higher heat gain values. At 60% window to wall ratio mud brick walls with reflective window glass have 24.93kWh heat gain and dense concrete walls with clear glass have 32.9 kWh heat gain. The results of the study help in establishing the best combination of wall and glass materials for minimum heat gain into buildings.

scholarly journals Modelling dielectric and magnetic properties of ferroconcrete

2008 ◽  
Vol 6 ◽  
pp. 289-292 ◽  
Author(s):  
T. Frenzel ◽  
M. Koch
Keyword(s):  
Magnetic Properties ◽  
Method Of Moments ◽  
Building Materials ◽  
Field Analysis ◽  
Shielding Effectiveness ◽  
Frequency Range ◽  
Analysis Software ◽  
Reflection And Transmission ◽  
Measurement Results ◽  
The Government

Abstract. This contribution discusses the modelling and parameterization of dielectric and magnetic properties of ferroconcrete by using numerical electromagnetic field analysis software. The software is based on the Method of Moments (MoM). The shielding effectiveness (SE) of the ferroconcrete DUT was already measured in a study by order of the government. According to these results, the ferroconcrete DUT is modelled and calculated. Therefore the DUT is subdivided into two parts. The first part represents the reinforcement mesh; the second part represents the lossy concrete with complex permittivity. Afterwards, the reflection and transmission properties of numerical analysed building materials are validated and compared with the measurement results in a frequency range of 30–1000 MHz.

scholarly journals Analysis of Reflectivity and Shielding Effectiveness of Absorbing Material–Conductor Laminate for Electromagnetic Compatibility

2010 ◽  
Vol 02 (05) ◽  
pp. 318-323 ◽  
Author(s):  
Cheruku D. Raj ◽  
Gottapu S. Rao ◽  
Pappu V. Y. Jayasree ◽  
Budumuru Srinu ◽  
Pappula Lakshman
Keyword(s):  
Electromagnetic Compatibility ◽  
Shielding Effectiveness ◽  
Absorbing Material

scholarly journals The analysis of heat conductivity coefficient of the aerated concrete building barriers depending on moisture changes

2011 ◽  
Vol 8 (1) ◽  
pp. 107-116
Author(s):  
Zbigniew Suchorab ◽  
Danuta Barnat-Hunek
Keyword(s):  
Heat Conductivity ◽  
Building Materials ◽  
Winter Season ◽  
Time Domain Reflectometry ◽  
Heat Conductivity Coefficient ◽  
Water Desorption ◽  
Concrete Building ◽  
Absorbing Material ◽  
Aerated Concrete ◽  
Comfort Parameters

The article is sacrificed to the aerated concrete building barriers moisture phenomenon. Water, which increases heat conductivity of building materials is the reason of the increased heat loses during the winter season. The result of this phenomenon is the decrease of indoor heat comfort parameters. Aerated concrete is a strongly water absorbing material with elongated time of water desorption. Capillary-porous structure of the described medium makes is highly prone to water influence what is the reason of the detailed analysis of heat conductivity coefficient in relation to moisture. In this article it is analyzed and compared the influence of moisture changes on heat parameters of the aerated concrete with the bulk densities of 400 and 600 kg/m3 using the reflectometric techniques TDR (Time Domain Reflectometry).

Ionizing radiation shielding effectiveness of decorative building materials (porcelain and ceramic tiles) used in Bangladeshi dwellings

2018 ◽  
Vol 28 (6) ◽  
pp. 825-836 ◽  
Author(s):  
Sabina Yasmin ◽  
Mayeen Uddin Khandaker ◽  
Bijoy Sonker Barua ◽  
Md Nurul Mustafa ◽  
Faruque-Uz-Zaman Chowdhury ◽  
...  
Keyword(s):  
Ionizing Radiation ◽  
Building Materials ◽  
Radiation Shielding ◽  
Shielding Effectiveness ◽  
Ceramic Tiles

scholarly journals EM shielding effectiveness of Pd-CNT-Cu nanocomposite buckypaper

2015 ◽  
Vol 3 (26) ◽  
pp. 13986-13993 ◽  
Author(s):  
Anil Kumar ◽  
Avanish Pratap Singh ◽  
Saroj Kumari ◽  
A. K. Srivastava ◽  
Sivaiah Bathula ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwall Carbon Nanotubes ◽  
Cu Nanoparticles ◽  
Shielding Effectiveness ◽  
Absorbing Material ◽  
Microwave Absorbing ◽  
Multiwall Carbon

We report the synthesis of a nanocomposite consisting of Pd doped multiwall carbon nanotubes decorated with Cu nanoparticles, as a lightweight and flexible microwave absorbing material, using an electroless technique.

Preparation and properties of graphene aerogel/cotton composite flexible fabric with electromagnetic interference (EMI) shielding function

2021 ◽  
pp. 152808372198927
Author(s):  
Peng Wang ◽  
Shuqiang Liu ◽  
Man Zhang ◽  
Gaihong Wu ◽  
Kaiwen Wang ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
Waterborne Polyurethane ◽  
Development Trend ◽  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Graphene Aerogel ◽  
Emi Shielding Effectiveness ◽  
Aerogel Composite ◽  
Electromagnetic Pollution

In order to alleviate the problems caused by electromagnetic pollution and simultaneously adapt to the future development trend of flexible wearable electronic equipment, it is high time to focus on the research of light weight, flexible and efficient electromagnetic interference (EMI) shielding material. A graphene aerogel composite EMI shielding composite fabric was prepared by combining graphene aerogel with fabric through the connection of waterborne polyurethane. The influence of aerogel amount on the EMI shielding function of fabric was discussed, and the waterborne polyurethane dosage on fabric mechanics and fabric style was also investigated. The result shows the composite fabric EMI shielding effectiveness reached 28 dB when the graphene aerogel amount was 25 mL (only 0.066 mL/cm2), which has satisfied the civilian requirements (20 dB). A good adhesion fastness between graphene and cotton fabric was obtained and the mechanical strength was also improved when the content of waterborne polyurethane was 20 mL. Graphene aerogel electromagnetic shielding composite fabric with good electromagnetic shielding performance and less consumption of nano carbon materials will have a good industrial application prospect.

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