PSI - Issue 64

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ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 64 (2024) 214–219

SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Nondestructive test for visualization of water movement in concrete using neutron imaging M. Mizuta a, *, T. Takanashi a , Y. Otake a , A. Ueno b , I. Kurashige c , H. Ueda d , Y. Kubo e a RIKEN, 2-1 Hirosawa, Wako-city Saitama 351-0198, Japan b Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji-city Tokyo 192-0397, Japan Abstract Water penetration in concrete has been introduced into Japanese Standard Specifications for Concrete Structures ‘ Design ’ in 2018. This clearly shows that water ingress through surfaces can affect steel corrosion. Test method for water penetration rate coefficient of concrete subjected to water in short term was indicated at the same time. In 2022, Specifications ‘ Maintenance ’ has involved this coefficient to estimate progress of steel corrosion. The proposed test method can be useful for maintenance on the one hand and has a problem on the other. The test is performed in destructive way and needs nine circular specimens (100 mm in diameter and 200 mm in height). The aim of this research is to develop nondestructive test method which can visualize water movement in concrete. Neutron imaging is chosen to attain this goal and is conducted at the RIKEN Accelerator-driven compact Neutron Source, RANS. For incident neutrons, transmittance is changed by the element distributed to the transmission direction and the volume. Especially, hydrogen strongly scatter incident neutrons and water is imaged as shades. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers Keywords: Concrete, Water movement, Neutron imaging, Nondestructive test, Compact neutron source SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Nondestructive test for visualization of water movement in concrete using neutron imaging M. Mizuta a, *, T. Takanashi a , Y. Otake a , A. Ueno b , I. Kurashige c , H. Ueda d , Y. Kubo e a RIKEN, 2-1 Hirosawa, Wako-city Saitama 351-0198, Japan b Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji-city Tokyo 192-0397, Japan c Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko-city Chiba 270-1194, Japan d Railway Technical Research Institute, 2-8-38 Hikari-cho, Kokubunji-city Tokyo 185-8540, Japan e Kanazawa University,Kakuma-cho, Kanazawa-city Ishikawa 920-1192, Japan Abstract Water penetration in concrete has been introduced into Japanese Standard Specifications for Concrete Structures ‘ Design ’ in 2018. This clearly shows that water ingress through surfaces can affect steel corrosion. Test method for water penetration rate coefficient of concrete subjected to water in short term was indicated at the same time. In 2022, Specifications ‘ Maintenance ’ has involved this coefficient to estimate progress of steel corrosion. The proposed test method can be useful for maintenance on the one hand and has a problem on the other. The test is performed in destructive way and needs nine circular specimens (100 mm in diameter and 200 mm in height). The aim of this research is to develop nondestructive test method which can visualize water movement in concrete. Neutron imaging is chosen to attain this goal and is conducted at the RIKEN Accelerator-driven compact Neutron Source, RANS. For incident neutrons, transmittance is changed by the element distributed to the transmission direction and the volume. Especially, hydrogen strongly scatter incident neutrons and water is imaged as shades. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers Keywords: Concrete, Water movement, Neutron imaging, Nondestructive test, Compact neutron source © 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers c Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko-city Chiba 270-1194, Japan d Railway Technical Research Institute, 2-8-38 Hikari-cho, Kokubunji-city Tokyo 185-8540, Japan e Kanazawa University,Kakuma-cho, Kanazawa-city Ishikawa 920-1192, Japan

* Corresponding author. Tel.: +81-48-467-9647; fax: +81-48-462-4428. E-mail address: maki.mizuta@riken.jp * Corresponding author. Tel.: +81-48-467-9647; fax: +81-48-462-4428. E-mail address: maki.mizuta@riken.jp

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers 2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers

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