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http://dx.doi.org/10.14190/JRCR.2021.9.4.506

A Study on the Error Rate of Non-destructive Rebar Detection Under Different Environmental Factors  

Kang, Beom-Ju (Department of Civil Engineering, Gyeongsang National University)
Kim, Young-Hwan (Department of Civil Engineering, Gyeongsang National University)
Kim, Young-Min (Korea Authority of Land & Infrastructure Safty)
Park, Kyung-Han (Korea Authority of Land & Infrastructure Safty)
Oh, Hong-Seob (Department of Civil Engineering, Gyeongsang National University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.9, no.4, 2021 , pp. 506-513 More about this Journal
Abstract
The durability and safety of reinforced concrete structures significantly depend on the reinforcement conditions, concrete cover thickness, cracks, and concrete strength. There are two ways to accurately determine the information on reinforcing bars embedded in concrete - the local destructive method and the non-destructive rebar detection test. In general, the non-destructive rebar detection tests, such as the electromagnetic wave radar method, electromagnetic induction method, and radiation method, are adopted to avoid damage to the structural elements. The moisture content and temperature of concrete affect the dielectric constant, which is the electrical property of concrete, and cause interference in the non-destructive rebar detection test results. Therefore, in this study, the effects of the electromagnetic wave radar method and electromagnetic induction method have been analyzed according to the temperature and surface moisture content of concrete. Due to the technological advancement and development of equipment, the average error rate was less than 5% in the specimens at 24℃, irrespective of their operating principles. Among the tested methods, the electromagnetic induction method showed very high accuracy. The electromagnetic wave radar method indicated a relatively small error rate in the dry state than in the wet state, and exhibited a relatively high error rate at high temperatures. It was confirmed that the error could be reduced by applying the electromagnetic wave radar method when the temperature of the probe was low and in a dry state, and by using the electromagnetic induction method when the probe was in a wet state or at a high temperature.
Keywords
Electromagnetic radar method; Electromagnetic induction method; Surface moisture content; Temperature; Error rate;
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