Fundamental Study on Improvement of Estimation Accuracy of Content of Chloride Ions in Concrete Using Electromagnetic Waves Method

Nojima, Junichiro; Uchida, M.; Arai, Junichi; Mizobuchi, Toshiaki

doi:10.2208/jscejmcs.72.109

Cited by 7 publications

(3 citation statements)

References 1 publication

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“…The authors focused on the following in earlier studies (Nojima 2015;Nojima and Mizobuchi 2011a, 2011b, 2018Nojima et al 2012Nojima et al , 2013Nojima et al , 2015aNojima et al , 2015bNojima et al , 2016aNojima et al , 2016b:…”

Section: Principle Of Technology For Determination Of Chloride Ion Comentioning

confidence: 99%

Research and Development of Infrastructure Diagnostic Robot System (ALP) for Detailed Inspection of Concrete Structures at Elevated Heights

Nojima

Mizobuchi

Hayashi³

2019

ACT

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This paper describes the research and development of an inspection diagnostic system that applies robot technology to the detailed inspection of infrastructure such as concrete walls in high places. ALP uses a vacuum suction pad improved by testing on real structures as a moving mechanism. ALP is also fitted with a measurement system that consists of a high-resolution camera, an electromagnetic wave radar, and a hammering sound diagnostic device. The result is a highly capable self-propelling inspection system that can carry out detailed inspections of infrastructure in difficult-to-access locations such as high places.

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Section: Principle Of Technology For Determination Of Chloride Ion Comentioning

confidence: 99%

Research and Development of Infrastructure Diagnostic Robot System (ALP) for Detailed Inspection of Concrete Structures at Elevated Heights

Nojima

Mizobuchi

Hayashi³

2019

ACT

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“…The authors are developing a comprehensive evaluation method of degradation state of concrete structures for the purpose of their deterioration evaluation, life prediction, maintenance support. For this purpose, we try to organize multiple diagnostic techniques, like "electro magnetic exploration for chloride intrusion 1) ", "Infrared examination for reinforcement corrosion 2) " and "Impact-echo method for defects of concrete". We aim to estimate the initial state, the degradation speed, and the service life by integrating environmental information and design information, deterioration information of structures obtained from these diagnostic methods.…”

Section: Introductionmentioning

confidence: 99%

Improvement of impact-echo method by applying image recognition of sound spectrogram

Shimbo¹

2019

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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The authors are investigating a method for lifetime prediction of concrete structures by a comprehensive judgment of survey results and information on design and environment. In this paper, we tried to apply impact-echo acoustic spectrogram to image recognition by machine learning in order to have a better estimation of defects in concrete. impact-echo sound sampling was conducted on specimens containing variated voids in depth and diameter. Each sound spectrogram was transformed into 28 by 28 pixels grayscale picture. As a result of the study, it was confirmed that the estimation by machine learning showed competitive accuracy as estimation by a human expert. Also, it was shown that the depth and diameter of the void are predictable under certain conditions. Furthermore, the authors showed the possibility of this method in actual concrete structure.

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“…Based on those results, the equation of estimation of the content of chloride ions using electromagnetic wave was derived by multiplying the conductivity of concrete, which is considered to directly affect the change of content of chloride ions, by the influence coefficients. So far, estimation of the content of chloride ions has been carried out on multiple existing structures using the equation of estimation and the applicability of estimation of the content of chloride ions by electromagnetic waves has been found out [4][5]. However, since the estimation of the content of chloride ions by electromagnetic waves utilizes the attenuation characteristics of the electromagnetic waves, the estimated content of chloride ions itself is the average content of chloride ions from the concrete surface to the position of rebar.…”

Section: Introductionmentioning

confidence: 99%

Study on estimation of distribution of chloride ions content on surface area of concrete member combining electromagnetic wave method and X-ray fluorescence method

Mizobuchi¹

2019

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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In the case of deterioration caused by corrosion expansion of reinforcing bars such as salt damage, large damages cannot be found on the concrete surface until cracking. In order to estimate the progress of salt damage, the authors have been investigating to estimate content of chloride ions using electromagnetic waves, which is one of the nondestructive testing methods, and have found the applicability. On the other hand, the estimation of content of chloride ions using electromagnetic waves is the average content of chloride ions from concrete surface to rebar, and in order to estimate the distribution of content of chloride ions, it is necessary to decide the surface content of chloride ions and the diffusion coefficient which are set to be equivalent to the average content of chloride ions estimated by electromagnetic waves. In this paper, in order to evaluate the distribution of content of chloride ions during the latency stage and the progression stage before corrosion induced cracks appear on the concrete surface, the method to estimate the distribution of content of chloride ions in the cover concrete combining both electromagnetic waves and X-ray fluorescent is proposed.

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Fundamental Study on Improvement of Estimation Accuracy of Content of Chloride Ions in Concrete Using Electromagnetic Waves Method

Cited by 7 publications

References 1 publication

Research and Development of Infrastructure Diagnostic Robot System (ALP) for Detailed Inspection of Concrete Structures at Elevated Heights

Research and Development of Infrastructure Diagnostic Robot System (ALP) for Detailed Inspection of Concrete Structures at Elevated Heights

Improvement of impact-echo method by applying image recognition of sound spectrogram

Study on estimation of distribution of chloride ions content on surface area of concrete member combining electromagnetic wave method and X-ray fluorescence method

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