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Measurements of electomagnetic properties of cement concrete for nondestructive evaluation at microwave frequencies / Rosnoizam Abdul Majid

Electromagnetic properties such as complex permitivities of concrete are a functions of moisture content, fequency, temperature and concrete mix constituents. By using an appropriate model (e.g. effective medium theory ), it is possible to determine the moisture content from dielectric measurements...

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Main Author: Abdul Majid, Rosnoizam
Format: Thesis
Language:English
Published: 1998
Subjects:
TK Electrical engineering. Electronics. Nuclear engineering
Microwave communication systems
Online Access:https://ir.uitm.edu.my/id/eprint/104656/1/104656.pdf
https://ir.uitm.edu.my/id/eprint/104656/
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spelling my.uitm.ir.1046562024-10-08T09:23:07Z https://ir.uitm.edu.my/id/eprint/104656/ Measurements of electomagnetic properties of cement concrete for nondestructive evaluation at microwave frequencies / Rosnoizam Abdul Majid Abdul Majid, Rosnoizam TK Electrical engineering. Electronics. Nuclear engineering Microwave communication systems Electromagnetic properties such as complex permitivities of concrete are a functions of moisture content, fequency, temperature and concrete mix constituents. By using an appropriate model (e.g. effective medium theory ), it is possible to determine the moisture content from dielectric measurements of dry and wet specimens of concrete. A fre-space microwave measurement system will be used for reflection coefficient measurements of metal-backed specimens in the frequency range of 7.5 - 14.5 GHz. Complex permitivities of concrete specimens will be determined from reflection coefficient values using two minima method and infinite sample method. The key components of the measurements system are a pair of spot-focusing hom lens antennas, mode transition, coaxial cables and microwave network analyzer. The inaccuracies in dielectric measurements using this set up is due to diffraction effects at the edges of the specimens and the multiple reflection between two horns. The spot-focusing horn lens antenna are used for minimizing diffraction effects and free-space LRL (line, reflect and line ) calibration method eliminates errors due to multiple refelctions. Complex permitivities and moisture contents is reported for cement concrete specimens of grades 25, 30, 40 and 50. These grades have different values of water to cement ratio and concrete mix constituents. We have calculated moisture content of cement concretesamples using dielectric mixture theory. 1998 Thesis NonPeerReviewed text en https://ir.uitm.edu.my/id/eprint/104656/1/104656.pdf Measurements of electomagnetic properties of cement concrete for nondestructive evaluation at microwave frequencies / Rosnoizam Abdul Majid. (1998) Degree thesis, thesis, MARA Institute of Technology (ITM). <http://terminalib.uitm.edu.my/104656.pdf>
institution Universiti Teknologi Mara
building Tun Abdul Razak Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Mara
content_source UiTM Institutional Repository
url_provider http://ir.uitm.edu.my/
language English
topic TK Electrical engineering. Electronics. Nuclear engineering
Microwave communication systems
spellingShingle TK Electrical engineering. Electronics. Nuclear engineering
Microwave communication systems
Abdul Majid, Rosnoizam
Measurements of electomagnetic properties of cement concrete for nondestructive evaluation at microwave frequencies / Rosnoizam Abdul Majid
description Electromagnetic properties such as complex permitivities of concrete are a functions of moisture content, fequency, temperature and concrete mix constituents. By using an appropriate model (e.g. effective medium theory ), it is possible to determine the moisture content from dielectric measurements of dry and wet specimens of concrete. A fre-space microwave measurement system will be used for reflection coefficient measurements of metal-backed specimens in the frequency range of 7.5 - 14.5 GHz. Complex permitivities of concrete specimens will be determined from reflection coefficient values using two minima method and infinite sample method. The key components of the measurements system are a pair of spot-focusing hom lens antennas, mode transition, coaxial cables and microwave network analyzer. The inaccuracies in dielectric measurements using this set up is due to diffraction effects at the edges of the specimens and the multiple reflection between two horns. The spot-focusing horn lens antenna are used for minimizing diffraction effects and free-space LRL (line, reflect and line ) calibration method eliminates errors due to multiple refelctions. Complex permitivities and moisture contents is reported for cement concrete specimens of grades 25, 30, 40 and 50. These grades have different values of water to cement ratio and concrete mix constituents. We have calculated moisture content of cement concretesamples using dielectric mixture theory.
format Thesis
author Abdul Majid, Rosnoizam
author_facet Abdul Majid, Rosnoizam
author_sort Abdul Majid, Rosnoizam
title Measurements of electomagnetic properties of cement concrete for nondestructive evaluation at microwave frequencies / Rosnoizam Abdul Majid
title_short Measurements of electomagnetic properties of cement concrete for nondestructive evaluation at microwave frequencies / Rosnoizam Abdul Majid
title_full Measurements of electomagnetic properties of cement concrete for nondestructive evaluation at microwave frequencies / Rosnoizam Abdul Majid
title_fullStr Measurements of electomagnetic properties of cement concrete for nondestructive evaluation at microwave frequencies / Rosnoizam Abdul Majid
title_full_unstemmed Measurements of electomagnetic properties of cement concrete for nondestructive evaluation at microwave frequencies / Rosnoizam Abdul Majid
title_sort measurements of electomagnetic properties of cement concrete for nondestructive evaluation at microwave frequencies / rosnoizam abdul majid
publishDate 1998
url https://ir.uitm.edu.my/id/eprint/104656/1/104656.pdf
https://ir.uitm.edu.my/id/eprint/104656/
_version_ 1814058590100520960
score 13.211869

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