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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1998
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my-uitm-ir.1046562024-10-08T09:23:07Z Measurements of electomagnetic properties of cement concrete for nondestructive evaluation at microwave frequencies / Rosnoizam Abdul Majid 1998 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 https://ir.uitm.edu.my/id/eprint/104656/ https://ir.uitm.edu.my/id/eprint/104656/1/104656.pdf text en public degree MARA Institute of Technology (ITM) Faculty of Electrical Engineering Ghodgaonkar, Deepak Kumar |
| institution |
Universiti Teknologi MARA |
| collection |
UiTM Institutional Repository |
| language |
English |
| advisor |
Ghodgaonkar, Deepak Kumar |
| 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 |
| qualification_level |
Bachelor degree |
| 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 |
| granting_institution |
MARA Institute of Technology (ITM) |
| granting_department |
Faculty of Electrical Engineering |
| publishDate |
1998 |
| url |
https://ir.uitm.edu.my/id/eprint/104656/1/104656.pdf |
| _version_ |
1818588116331528192 |