Cargando…

Accuracy of Eddy-Current and Radar Methods Used in Reinforcement Detection

This article presents results from non-destructive testing (NDT) that referred to the location and diameter or rebars in beam and slab members. The aim of paper was to demonstrate that the accuracy and deviations of the NDT methods could be higher than the allowable execution or standard deviations....

Descripción completa

Detalles Bibliográficos
Autores principales: Drobiec, Łukasz, Jasiński, Radosław, Mazur, Wojciech
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6479516/
https://www.ncbi.nlm.nih.gov/pubmed/30974808
http://dx.doi.org/10.3390/ma12071168
_version_ 1783413363185811456
author Drobiec, Łukasz
Jasiński, Radosław
Mazur, Wojciech
author_facet Drobiec, Łukasz
Jasiński, Radosław
Mazur, Wojciech
author_sort Drobiec, Łukasz
collection PubMed
description This article presents results from non-destructive testing (NDT) that referred to the location and diameter or rebars in beam and slab members. The aim of paper was to demonstrate that the accuracy and deviations of the NDT methods could be higher than the allowable execution or standard deviations. Tests were conducted on autoclaved aerated concrete beam and nine specimens that were specially prepared from lightweight concrete. The most advanced instruments that were available on the market were used to perform tests. They included two electromagnetic scanners and one ground penetrating radar (GPR). The testing equipment was used to analyse how the rebar (cover) location affected the detection of their diameters and how their mutual spacing influenced the detected quantity of rebars. The considerations included the impact of rebar depth on cover measurements and the spread of obtained results. Tests indicated that the measurement error was clearly greater when the rebars were located at very low or high depths. It could lead to the improper interpretation of test results, and consequently to the incorrect estimation of the structure safety based on the design resistance analysis. Electromagnetic and radar devices were unreliable while detecting the reinforcement of small (8 and 10 mm) diameters at close spacing (up to 20 mm) and of large (20 mm) diameters at a close spacing and greater depths. Recommendations for practical applications were developed to facilitate the evaluation of a structure.
format Online
Article
Text
id pubmed-6479516
institution National Center for Biotechnology Information
language English
publishDate 2019
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-64795162019-04-29 Accuracy of Eddy-Current and Radar Methods Used in Reinforcement Detection Drobiec, Łukasz Jasiński, Radosław Mazur, Wojciech Materials (Basel) Article This article presents results from non-destructive testing (NDT) that referred to the location and diameter or rebars in beam and slab members. The aim of paper was to demonstrate that the accuracy and deviations of the NDT methods could be higher than the allowable execution or standard deviations. Tests were conducted on autoclaved aerated concrete beam and nine specimens that were specially prepared from lightweight concrete. The most advanced instruments that were available on the market were used to perform tests. They included two electromagnetic scanners and one ground penetrating radar (GPR). The testing equipment was used to analyse how the rebar (cover) location affected the detection of their diameters and how their mutual spacing influenced the detected quantity of rebars. The considerations included the impact of rebar depth on cover measurements and the spread of obtained results. Tests indicated that the measurement error was clearly greater when the rebars were located at very low or high depths. It could lead to the improper interpretation of test results, and consequently to the incorrect estimation of the structure safety based on the design resistance analysis. Electromagnetic and radar devices were unreliable while detecting the reinforcement of small (8 and 10 mm) diameters at close spacing (up to 20 mm) and of large (20 mm) diameters at a close spacing and greater depths. Recommendations for practical applications were developed to facilitate the evaluation of a structure. MDPI 2019-04-10 /pmc/articles/PMC6479516/ /pubmed/30974808 http://dx.doi.org/10.3390/ma12071168 Text en © 2019 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
Drobiec, Łukasz
Jasiński, Radosław
Mazur, Wojciech
Accuracy of Eddy-Current and Radar Methods Used in Reinforcement Detection
title Accuracy of Eddy-Current and Radar Methods Used in Reinforcement Detection
title_full Accuracy of Eddy-Current and Radar Methods Used in Reinforcement Detection
title_fullStr Accuracy of Eddy-Current and Radar Methods Used in Reinforcement Detection
title_full_unstemmed Accuracy of Eddy-Current and Radar Methods Used in Reinforcement Detection
title_short Accuracy of Eddy-Current and Radar Methods Used in Reinforcement Detection
title_sort accuracy of eddy-current and radar methods used in reinforcement detection
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6479516/
https://www.ncbi.nlm.nih.gov/pubmed/30974808
http://dx.doi.org/10.3390/ma12071168
work_keys_str_mv AT drobiecłukasz accuracyofeddycurrentandradarmethodsusedinreinforcementdetection
AT jasinskiradosław accuracyofeddycurrentandradarmethodsusedinreinforcementdetection
AT mazurwojciech accuracyofeddycurrentandradarmethodsusedinreinforcementdetection