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Electrical Resistivity Measurements of Reinforced Concrete Slabs with Delamination Defects

The main objectives of this research are to evaluate the effects of delamination defects on the measurement of electrical resistivity of reinforced concrete slabs through analytical and experimental studies in the laboratory, and to propose a practical guide for electrical resistivity measurements o...

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Autores principales: Robles, Kevin Paolo V., Kim, Dong-Won, Yee, Jurng-Jae, Lee, Jin-Wook, Kee, Seong-Hoon
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7764579/
https://www.ncbi.nlm.nih.gov/pubmed/33322443
http://dx.doi.org/10.3390/s20247113
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author Robles, Kevin Paolo V.
Kim, Dong-Won
Yee, Jurng-Jae
Lee, Jin-Wook
Kee, Seong-Hoon
author_facet Robles, Kevin Paolo V.
Kim, Dong-Won
Yee, Jurng-Jae
Lee, Jin-Wook
Kee, Seong-Hoon
author_sort Robles, Kevin Paolo V.
collection PubMed
description The main objectives of this research are to evaluate the effects of delamination defects on the measurement of electrical resistivity of reinforced concrete slabs through analytical and experimental studies in the laboratory, and to propose a practical guide for electrical resistivity measurements on concrete with delamination defects. First, a 3D finite element model was developed to simulate the variation of electric potential field in concrete over delamination defects with various depths and lateral sizes. Second, for experimental studies, two reinforced concrete slab specimens (1500 mm (width) by 1500 mm (length) by 300 mm (thickness)) with artificial delamination defects of various dimensions and depths were fabricated. Third, the electrical resistivity of concrete over delamination defects in the numerical simulation models and the two concrete slab specimens were evaluated by using a 4-point Wenner probe in accordance with AASHTO (American Association of State Highway and Transportation Office) T-358. It was demonstrated from analytical and experimental studies in this study that shallow (50 mm depth) and deep (250 mm depth) delamination defects resulted in higher and lower electrical resistivity (ER) values, respectively, as compared to measurements performed on solid concrete locations. Furthermore, the increase in size of shallow defects resulted in an increase in concrete resistivity, whereas the increase in sizes of deep delamination defects yielded opposite results. In addition, measurements done directly above the steel reinforcements significantly lowered ER values. Lastly, it was observed from experimental studies that the effect of delamination defects on the values of electrical resistivity decreases as the saturation level of concrete increases.
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spelling pubmed-77645792020-12-27 Electrical Resistivity Measurements of Reinforced Concrete Slabs with Delamination Defects Robles, Kevin Paolo V. Kim, Dong-Won Yee, Jurng-Jae Lee, Jin-Wook Kee, Seong-Hoon Sensors (Basel) Article The main objectives of this research are to evaluate the effects of delamination defects on the measurement of electrical resistivity of reinforced concrete slabs through analytical and experimental studies in the laboratory, and to propose a practical guide for electrical resistivity measurements on concrete with delamination defects. First, a 3D finite element model was developed to simulate the variation of electric potential field in concrete over delamination defects with various depths and lateral sizes. Second, for experimental studies, two reinforced concrete slab specimens (1500 mm (width) by 1500 mm (length) by 300 mm (thickness)) with artificial delamination defects of various dimensions and depths were fabricated. Third, the electrical resistivity of concrete over delamination defects in the numerical simulation models and the two concrete slab specimens were evaluated by using a 4-point Wenner probe in accordance with AASHTO (American Association of State Highway and Transportation Office) T-358. It was demonstrated from analytical and experimental studies in this study that shallow (50 mm depth) and deep (250 mm depth) delamination defects resulted in higher and lower electrical resistivity (ER) values, respectively, as compared to measurements performed on solid concrete locations. Furthermore, the increase in size of shallow defects resulted in an increase in concrete resistivity, whereas the increase in sizes of deep delamination defects yielded opposite results. In addition, measurements done directly above the steel reinforcements significantly lowered ER values. Lastly, it was observed from experimental studies that the effect of delamination defects on the values of electrical resistivity decreases as the saturation level of concrete increases. MDPI 2020-12-11 /pmc/articles/PMC7764579/ /pubmed/33322443 http://dx.doi.org/10.3390/s20247113 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Robles, Kevin Paolo V.
Kim, Dong-Won
Yee, Jurng-Jae
Lee, Jin-Wook
Kee, Seong-Hoon
Electrical Resistivity Measurements of Reinforced Concrete Slabs with Delamination Defects
title Electrical Resistivity Measurements of Reinforced Concrete Slabs with Delamination Defects
title_full Electrical Resistivity Measurements of Reinforced Concrete Slabs with Delamination Defects
title_fullStr Electrical Resistivity Measurements of Reinforced Concrete Slabs with Delamination Defects
title_full_unstemmed Electrical Resistivity Measurements of Reinforced Concrete Slabs with Delamination Defects
title_short Electrical Resistivity Measurements of Reinforced Concrete Slabs with Delamination Defects
title_sort electrical resistivity measurements of reinforced concrete slabs with delamination defects
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7764579/
https://www.ncbi.nlm.nih.gov/pubmed/33322443
http://dx.doi.org/10.3390/s20247113
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