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Crack Evaluation of Concrete Using Mechanochromic Sensor

In this study, the deformation of concrete materials was evaluated using a mechanochromic sensor that detects the discoloration reaction caused by deformation. This sensor was attached by applying the Loctite adhesive to both ends in the longitudinal direction. The process of applying tensile stress...

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Autores principales: Pyeon, Sujeong, Kim, Hongseop, Choe, Gyeongcheol, Lee, Myeongkyu, Jeon, Junseo, Kim, Gyuyong, Nam, Jeongsoo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9860578/
https://www.ncbi.nlm.nih.gov/pubmed/36676402
http://dx.doi.org/10.3390/ma16020662
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author Pyeon, Sujeong
Kim, Hongseop
Choe, Gyeongcheol
Lee, Myeongkyu
Jeon, Junseo
Kim, Gyuyong
Nam, Jeongsoo
author_facet Pyeon, Sujeong
Kim, Hongseop
Choe, Gyeongcheol
Lee, Myeongkyu
Jeon, Junseo
Kim, Gyuyong
Nam, Jeongsoo
author_sort Pyeon, Sujeong
collection PubMed
description In this study, the deformation of concrete materials was evaluated using a mechanochromic sensor that detects the discoloration reaction caused by deformation. This sensor was attached by applying the Loctite adhesive to both ends in the longitudinal direction. The process of applying tensile stress to the specimens was videotaped, and the deformation and discoloration were examined through image analysis. The mechanochromic sensor was not affected by the finished surface condition, and the discoloration reaction was detected for a concrete material deformation level of up to 0.01 mm. The detected level was caused by the elongation of the sensor, and the discoloration compared with the initial color was identified. In addition, the integration behavior of the mechanochromic sensor under the deterioration of concrete members in cold areas and winter environments, as well as the discoloration reaction of the sensor in a low-temperature environment, was examined. It was found that the discoloration ability of the mechanochromic sensor exposed to a low-temperature environment was restored in 2 h after the end of the freeze–thaw test, and it was judged that the deformation and discoloration levels will be properly measured when the surface temperature of the sensor is restored to a room temperature of approximately 15 °C. This appeared to be due to the room temperature recovery of the dielectric spacer of the sensor and the deformation structure of the resonance condition. The sensor was also attached when diagonal cracks occurred in the concrete beam members to evaluate the strain and discoloration rate according to the deformation and discoloration levels. Accordingly, the cracks and deformation of the concrete materials were monitored using measured values from the discoloration of the mechanochromic sensors, and the possibility of measuring the crack width was reviewed only by real-time monitoring and imaging with the naked eye.
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spelling pubmed-98605782023-01-22 Crack Evaluation of Concrete Using Mechanochromic Sensor Pyeon, Sujeong Kim, Hongseop Choe, Gyeongcheol Lee, Myeongkyu Jeon, Junseo Kim, Gyuyong Nam, Jeongsoo Materials (Basel) Article In this study, the deformation of concrete materials was evaluated using a mechanochromic sensor that detects the discoloration reaction caused by deformation. This sensor was attached by applying the Loctite adhesive to both ends in the longitudinal direction. The process of applying tensile stress to the specimens was videotaped, and the deformation and discoloration were examined through image analysis. The mechanochromic sensor was not affected by the finished surface condition, and the discoloration reaction was detected for a concrete material deformation level of up to 0.01 mm. The detected level was caused by the elongation of the sensor, and the discoloration compared with the initial color was identified. In addition, the integration behavior of the mechanochromic sensor under the deterioration of concrete members in cold areas and winter environments, as well as the discoloration reaction of the sensor in a low-temperature environment, was examined. It was found that the discoloration ability of the mechanochromic sensor exposed to a low-temperature environment was restored in 2 h after the end of the freeze–thaw test, and it was judged that the deformation and discoloration levels will be properly measured when the surface temperature of the sensor is restored to a room temperature of approximately 15 °C. This appeared to be due to the room temperature recovery of the dielectric spacer of the sensor and the deformation structure of the resonance condition. The sensor was also attached when diagonal cracks occurred in the concrete beam members to evaluate the strain and discoloration rate according to the deformation and discoloration levels. Accordingly, the cracks and deformation of the concrete materials were monitored using measured values from the discoloration of the mechanochromic sensors, and the possibility of measuring the crack width was reviewed only by real-time monitoring and imaging with the naked eye. MDPI 2023-01-10 /pmc/articles/PMC9860578/ /pubmed/36676402 http://dx.doi.org/10.3390/ma16020662 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/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 (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Pyeon, Sujeong
Kim, Hongseop
Choe, Gyeongcheol
Lee, Myeongkyu
Jeon, Junseo
Kim, Gyuyong
Nam, Jeongsoo
Crack Evaluation of Concrete Using Mechanochromic Sensor
title Crack Evaluation of Concrete Using Mechanochromic Sensor
title_full Crack Evaluation of Concrete Using Mechanochromic Sensor
title_fullStr Crack Evaluation of Concrete Using Mechanochromic Sensor
title_full_unstemmed Crack Evaluation of Concrete Using Mechanochromic Sensor
title_short Crack Evaluation of Concrete Using Mechanochromic Sensor
title_sort crack evaluation of concrete using mechanochromic sensor
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9860578/
https://www.ncbi.nlm.nih.gov/pubmed/36676402
http://dx.doi.org/10.3390/ma16020662
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