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Article

Fundamental Properties of Sub-THz Reflected Waves for Water Content Estimation of Reinforced Concrete Structures

by
Akio Tanaka
1,*,
Koji Arita
2,
Chihiro Kobayashi
3,
Tomoya Nishiwaki
3,
Tadao Tanabe
4 and
Sho Fujii
5
1
Department of Architecture, Nippon Institute of Technology, Saitama 345-8501, Japan
2
Constec Engi,Co., Tokyo 143-0006, Japan
3
Graduate School of Engineering, Tohoku University, Sendai 980-8577, Japan
4
College of Engineering and Design, Shibaura Institute of Technology, Tokyo 135-8548, Japan
5
Faculty of Science, Yamagata University, Yamagata 990-0021, Japan
*
Author to whom correspondence should be addressed.
Buildings 2024, 14(4), 1076; https://doi.org/10.3390/buildings14041076
Submission received: 7 March 2024 / Revised: 3 April 2024 / Accepted: 10 April 2024 / Published: 12 April 2024
(This article belongs to the Special Issue Advances in Structural and Mechanical Performances of Structures and Materials)
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Abstract

Water plays a significant role in the deterioration of reinforced concrete buildings; therefore, it is essential to evaluate the water content of the cover concrete. This study explores a novel non-destructive method for assessing the water content using sub-terahertz (sub-THz) waves. Among the four frequencies selected to evaluate the water content, an increase in reflectance was observed as the unit volume water content increased, and smaller data scatter was confirmed as the frequency increased. The derived empirical equation can classify the corrosion risk of the rebar environment based on the water content obtained using reflectance measurements. In other words, it can contribute to the diagnosis of the building integrity associated with rebar corrosion.
Keywords: sub-THz waves; reflection resistivity; measurement angle; volume water content; rebar corrosion sub-THz waves; reflection resistivity; measurement angle; volume water content; rebar corrosion

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MDPI and ACS Style

Tanaka, A.; Arita, K.; Kobayashi, C.; Nishiwaki, T.; Tanabe, T.; Fujii, S. Fundamental Properties of Sub-THz Reflected Waves for Water Content Estimation of Reinforced Concrete Structures. Buildings 2024, 14, 1076. https://doi.org/10.3390/buildings14041076

AMA Style

Tanaka A, Arita K, Kobayashi C, Nishiwaki T, Tanabe T, Fujii S. Fundamental Properties of Sub-THz Reflected Waves for Water Content Estimation of Reinforced Concrete Structures. Buildings. 2024; 14(4):1076. https://doi.org/10.3390/buildings14041076

Chicago/Turabian Style

Tanaka, Akio, Koji Arita, Chihiro Kobayashi, Tomoya Nishiwaki, Tadao Tanabe, and Sho Fujii. 2024. "Fundamental Properties of Sub-THz Reflected Waves for Water Content Estimation of Reinforced Concrete Structures" Buildings 14, no. 4: 1076. https://doi.org/10.3390/buildings14041076

APA Style

Tanaka, A., Arita, K., Kobayashi, C., Nishiwaki, T., Tanabe, T., & Fujii, S. (2024). Fundamental Properties of Sub-THz Reflected Waves for Water Content Estimation of Reinforced Concrete Structures. Buildings, 14(4), 1076. https://doi.org/10.3390/buildings14041076

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