Study of infrared thermal application for detecting defects within tunnel lining

Alireza Afshani Mehrabad, Koichi Kawakami, Shinji Konishi, Hirokazu Akaki

    Research output: Contribution to journalArticle

    Abstract

    With the aging of tunnels, additional maintenance and assessment procedures are required to monitor their working conditions. The passive thermal infrared method, which is a nondestructive contact-free method, is used to find defects in a box-type and shield tunnels with concrete lining. In this study, this method is numerically applied to detect defects in an unhealthy concrete structure. The thermal field data measurements are reviewed and the governing heat transfer mechanisms for a defected concrete surface are presented. The heat transfer in the concrete segment, tunnel air, and the air inside the void due to the conduction, convection, and radiation mechanisms is explained. Further, the type of cavity, the temperature difference between the healthy and unhealthy concrete surfaces, the temperature difference between the tunnel air and concrete surfaces, and the influence of the void depth on the detection accuracy are investigated. The results show that the temperature difference between the concrete surface and the tunnel air is more than 0.35 °C, which is an ideal condition for detecting the voids with an approximate depth of 30 mm or less.

    Original languageEnglish
    Pages (from-to)186-197
    Number of pages12
    JournalTunnelling and Underground Space Technology
    Volume86
    DOIs
    Publication statusPublished - 2019 Apr 1

    Fingerprint

    Tunnel linings
    tunnel lining
    defect
    tunnel
    Concretes
    Tunnels
    Infrared radiation
    Defects
    void
    air
    heat transfer
    Air
    concrete structure
    Heat transfer
    temperature
    working conditions
    shield
    Linings
    cavity
    Concrete construction

    Keywords

    • Defected lining
    • Hammering test
    • Heat transfer
    • Infrared thermography
    • RC tunnel lining

    ASJC Scopus subject areas

    • Building and Construction
    • Geotechnical Engineering and Engineering Geology

    Cite this

    Study of infrared thermal application for detecting defects within tunnel lining. / Afshani Mehrabad, Alireza; Kawakami, Koichi; Konishi, Shinji; Akaki, Hirokazu.

    In: Tunnelling and Underground Space Technology, Vol. 86, 01.04.2019, p. 186-197.

    Research output: Contribution to journalArticle

    @article{5648d109e912413a9f49a4c0a77700cf,
    title = "Study of infrared thermal application for detecting defects within tunnel lining",
    abstract = "With the aging of tunnels, additional maintenance and assessment procedures are required to monitor their working conditions. The passive thermal infrared method, which is a nondestructive contact-free method, is used to find defects in a box-type and shield tunnels with concrete lining. In this study, this method is numerically applied to detect defects in an unhealthy concrete structure. The thermal field data measurements are reviewed and the governing heat transfer mechanisms for a defected concrete surface are presented. The heat transfer in the concrete segment, tunnel air, and the air inside the void due to the conduction, convection, and radiation mechanisms is explained. Further, the type of cavity, the temperature difference between the healthy and unhealthy concrete surfaces, the temperature difference between the tunnel air and concrete surfaces, and the influence of the void depth on the detection accuracy are investigated. The results show that the temperature difference between the concrete surface and the tunnel air is more than 0.35 °C, which is an ideal condition for detecting the voids with an approximate depth of 30 mm or less.",
    keywords = "Defected lining, Hammering test, Heat transfer, Infrared thermography, RC tunnel lining",
    author = "{Afshani Mehrabad}, Alireza and Koichi Kawakami and Shinji Konishi and Hirokazu Akaki",
    year = "2019",
    month = "4",
    day = "1",
    doi = "10.1016/j.tust.2019.01.013",
    language = "English",
    volume = "86",
    pages = "186--197",
    journal = "Tunnelling and Underground Space Technology",
    issn = "0886-7798",
    publisher = "Elsevier Limited",

    }

    TY - JOUR

    T1 - Study of infrared thermal application for detecting defects within tunnel lining

    AU - Afshani Mehrabad, Alireza

    AU - Kawakami, Koichi

    AU - Konishi, Shinji

    AU - Akaki, Hirokazu

    PY - 2019/4/1

    Y1 - 2019/4/1

    N2 - With the aging of tunnels, additional maintenance and assessment procedures are required to monitor their working conditions. The passive thermal infrared method, which is a nondestructive contact-free method, is used to find defects in a box-type and shield tunnels with concrete lining. In this study, this method is numerically applied to detect defects in an unhealthy concrete structure. The thermal field data measurements are reviewed and the governing heat transfer mechanisms for a defected concrete surface are presented. The heat transfer in the concrete segment, tunnel air, and the air inside the void due to the conduction, convection, and radiation mechanisms is explained. Further, the type of cavity, the temperature difference between the healthy and unhealthy concrete surfaces, the temperature difference between the tunnel air and concrete surfaces, and the influence of the void depth on the detection accuracy are investigated. The results show that the temperature difference between the concrete surface and the tunnel air is more than 0.35 °C, which is an ideal condition for detecting the voids with an approximate depth of 30 mm or less.

    AB - With the aging of tunnels, additional maintenance and assessment procedures are required to monitor their working conditions. The passive thermal infrared method, which is a nondestructive contact-free method, is used to find defects in a box-type and shield tunnels with concrete lining. In this study, this method is numerically applied to detect defects in an unhealthy concrete structure. The thermal field data measurements are reviewed and the governing heat transfer mechanisms for a defected concrete surface are presented. The heat transfer in the concrete segment, tunnel air, and the air inside the void due to the conduction, convection, and radiation mechanisms is explained. Further, the type of cavity, the temperature difference between the healthy and unhealthy concrete surfaces, the temperature difference between the tunnel air and concrete surfaces, and the influence of the void depth on the detection accuracy are investigated. The results show that the temperature difference between the concrete surface and the tunnel air is more than 0.35 °C, which is an ideal condition for detecting the voids with an approximate depth of 30 mm or less.

    KW - Defected lining

    KW - Hammering test

    KW - Heat transfer

    KW - Infrared thermography

    KW - RC tunnel lining

    UR - http://www.scopus.com/inward/record.url?scp=85060706354&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=85060706354&partnerID=8YFLogxK

    U2 - 10.1016/j.tust.2019.01.013

    DO - 10.1016/j.tust.2019.01.013

    M3 - Article

    AN - SCOPUS:85060706354

    VL - 86

    SP - 186

    EP - 197

    JO - Tunnelling and Underground Space Technology

    JF - Tunnelling and Underground Space Technology

    SN - 0886-7798

    ER -