Detection of rebar corrosion by using ground penetrating radar

Reinforced concrete has been proven for its versatility, resistance, and longevity but over time it also suffers from deterioration due to different physical, chemical and, mechanical actions exist the concrete. Once the corrosion process starts, there is no way to reverse the process and visual ins...

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Main Author:	Abdul Rahman, Amirul Haiman
Format:	Thesis
Language:	English
Published:	2022
Subjects:	G70.39-70.6 Remote sensing
Online Access:	http://eprints.utm.my/id/eprint/100324/1/AmirulHaimanRahmanMBE2022.pdf
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spelling	my-utm-ep.1003242023-03-29T07:51:49Z Detection of rebar corrosion by using ground penetrating radar 2022 Abdul Rahman, Amirul Haiman G70.39-70.6 Remote sensing Reinforced concrete has been proven for its versatility, resistance, and longevity but over time it also suffers from deterioration due to different physical, chemical and, mechanical actions exist the concrete. Once the corrosion process starts, there is no way to reverse the process and visual inspection is one of the methods to detect the corrosion. However, it is only effective if there is evidence of corrosion exist from the surface of concrete such as cracks, delamination and spalling. Even though there are several methods to evaluate corrosion, however, most of them have an invasive character since the method requires extracting samples. There are several non-invasive techniques to detect corrosion such as GPR but this technique is not popular since the interpretation of GPR images is very difficult. This research addresses the major issue of assessing the corrosion of rebar inside a reinforced concrete that are invasive and costly since require a large amount of time and man power assess the condition with a simple yet effective method. So, the aim of this research is to detect the corrosion in rebar using GPR non-invasive technique. There are three objectives of this study which are to obtain all the parameters used calculate the radius of rebar, compare the estimated to original rebar size and to test the result validity to ground truthing data. The work starts with finding the suitable site to scan the rebar. 3 block of reinforced concrete beam located in B04, UTM. After the scanning is done, raw data are processed using Reflexw software provided by UTM. Then, the processed data are analyzed and conclusion is made. Findings of this research is that the difference of estimated rebar diameter is 16% differ from the original diameter. This can also be seen from hyperbola. The hyperbola depth is uneven because of the corrosion that disrupts the surrounding of rebar thus affecting the time of the signal to reach the rebar. Also, this statement can be validated by ground truthing data which shows that the rebar is corroded with brownish particles surrounding the rebar that causes by forming of oxide particles. This allows the GPR user to have an extra analysis to their report which is the current condition of the underground object scanned. This statement was proven in this research study as the change in rebar radius was detected to be 16% from the original value. Then, the hyperbolic image was also analysed that indicates the rebar scanned was corroded. 2022 Thesis http://eprints.utm.my/id/eprint/100324/ http://eprints.utm.my/id/eprint/100324/1/AmirulHaimanRahmanMBE2022.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:150164 masters Universiti Teknologi Malaysia Faculty of Built Environment & Surveying
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	G70.39-70.6 Remote sensing
spellingShingle	G70.39-70.6 Remote sensing Abdul Rahman, Amirul Haiman Detection of rebar corrosion by using ground penetrating radar
description	Reinforced concrete has been proven for its versatility, resistance, and longevity but over time it also suffers from deterioration due to different physical, chemical and, mechanical actions exist the concrete. Once the corrosion process starts, there is no way to reverse the process and visual inspection is one of the methods to detect the corrosion. However, it is only effective if there is evidence of corrosion exist from the surface of concrete such as cracks, delamination and spalling. Even though there are several methods to evaluate corrosion, however, most of them have an invasive character since the method requires extracting samples. There are several non-invasive techniques to detect corrosion such as GPR but this technique is not popular since the interpretation of GPR images is very difficult. This research addresses the major issue of assessing the corrosion of rebar inside a reinforced concrete that are invasive and costly since require a large amount of time and man power assess the condition with a simple yet effective method. So, the aim of this research is to detect the corrosion in rebar using GPR non-invasive technique. There are three objectives of this study which are to obtain all the parameters used calculate the radius of rebar, compare the estimated to original rebar size and to test the result validity to ground truthing data. The work starts with finding the suitable site to scan the rebar. 3 block of reinforced concrete beam located in B04, UTM. After the scanning is done, raw data are processed using Reflexw software provided by UTM. Then, the processed data are analyzed and conclusion is made. Findings of this research is that the difference of estimated rebar diameter is 16% differ from the original diameter. This can also be seen from hyperbola. The hyperbola depth is uneven because of the corrosion that disrupts the surrounding of rebar thus affecting the time of the signal to reach the rebar. Also, this statement can be validated by ground truthing data which shows that the rebar is corroded with brownish particles surrounding the rebar that causes by forming of oxide particles. This allows the GPR user to have an extra analysis to their report which is the current condition of the underground object scanned. This statement was proven in this research study as the change in rebar radius was detected to be 16% from the original value. Then, the hyperbolic image was also analysed that indicates the rebar scanned was corroded.
format	Thesis
qualification_level	Master's degree
author	Abdul Rahman, Amirul Haiman
author_facet	Abdul Rahman, Amirul Haiman
author_sort	Abdul Rahman, Amirul Haiman
title	Detection of rebar corrosion by using ground penetrating radar
title_short	Detection of rebar corrosion by using ground penetrating radar
title_full	Detection of rebar corrosion by using ground penetrating radar
title_fullStr	Detection of rebar corrosion by using ground penetrating radar
title_full_unstemmed	Detection of rebar corrosion by using ground penetrating radar
title_sort	detection of rebar corrosion by using ground penetrating radar
granting_institution	Universiti Teknologi Malaysia
granting_department	Faculty of Built Environment & Surveying
publishDate	2022
url	http://eprints.utm.my/id/eprint/100324/1/AmirulHaimanRahmanMBE2022.pdf
_version_	1776100670694227968

Detection of rebar corrosion by using ground penetrating radar

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