Design, construction, and NDT of a mock-up for reinforced concrete walls in NPP

Fahim Al-Neshawy, Rui Miguel Ferreira, Edgar Bohner, Teemu Ojala, Ville Sjöblom, Ernst Niederleithinger, Ute Effner, Jari Puttonen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    Construction methods, environmental stressors, and aging factors are the main causes for defects of reinforced concrete in nuclear power plants (NPP). These defects are typically occurred as corrosion of reinforcement steel, delamination, cracks, malfunction of post-tensioning or steel composite systems etc. Some of the challenges for assessing the performance of these structures by nondestructive testing methods (NDT) are that the assessment could be performed only during the annual overhauls when testing is time-limited and uncertainty of the accuracy and reliability of the available NDT testing devices combined with the lack of the international uniformity of the methods used for NDT tests.
    To overcome these challenges, a mock-up wall representing a section of the concrete containment of the NPP. The mock-up wall included simulated defects, which mimic the most common types of defects in NPP concrete structures such as dimensional errors, honeycombing, delamination, defects adjacent to the steel liner and voids in grouted tendon ducts for the posttensioned
    structures. This paper introduce the design and construction of the wall including the concrete properties, reinforcement, tendon ducts and the types of the simulated defects. The paper also introduces the NDT methods and techniques that are suitable for assessing the condition of the mock-up wall under the real environmental conditions. These techniques include mechanical
    methods as rebound hammer, ultrasonic and electromagnetic methods. This mock-up wall will enable to investigate reliably available NDT methods and experts’ skills providing also an important and very much need educational platform for future NDE experts.
    Original languageEnglish
    Title of host publicationSMiRT 25, August 4-9, 2019, Charlotte, NC, USA
    Subtitle of host publicationDivision IX
    PublisherInternational Assn for Structural Mechanics in Reactor Technology IASMiRT
    Number of pages12
    Publication statusPublished - 2019
    MoE publication typeA4 Article in a conference publication
    EventInternational Conference on Structural Mechanics in Reactor Technology, SMiRT 25 - Charlotte, United States
    Duration: 4 Aug 20199 Aug 2019
    Conference number: 25

    Conference

    ConferenceInternational Conference on Structural Mechanics in Reactor Technology, SMiRT 25
    Abbreviated titleSMiRT
    CountryUnited States
    CityCharlotte
    Period4/08/199/08/19

    Fingerprint

    Nondestructive examination
    Nuclear power plants
    Reinforced concrete
    Defects
    Tendons
    Delamination
    Ducts
    Steel
    Reinforcement
    Concretes
    Hammers
    Testing
    Concrete construction
    Large scale systems
    Aging of materials
    Ultrasonics
    Corrosion
    Cracks

    Keywords

    • NDE
    • concrete
    • thick-walled
    • defects
    • deterioration
    • steel liner

    Cite this

    Al-Neshawy, F., Ferreira, R. M., Bohner, E., Ojala, T., Sjöblom, V., Niederleithinger, E., ... Puttonen, J. (2019). Design, construction, and NDT of a mock-up for reinforced concrete walls in NPP. In SMiRT 25, August 4-9, 2019, Charlotte, NC, USA: Division IX International Assn for Structural Mechanics in Reactor Technology IASMiRT .
    Al-Neshawy, Fahim ; Ferreira, Rui Miguel ; Bohner, Edgar ; Ojala, Teemu ; Sjöblom, Ville ; Niederleithinger, Ernst ; Effner, Ute ; Puttonen, Jari. / Design, construction, and NDT of a mock-up for reinforced concrete walls in NPP. SMiRT 25, August 4-9, 2019, Charlotte, NC, USA: Division IX. International Assn for Structural Mechanics in Reactor Technology IASMiRT , 2019.
    @inproceedings{e3c1880bfe654153922371f2c5988b19,
    title = "Design, construction, and NDT of a mock-up for reinforced concrete walls in NPP",
    abstract = "Construction methods, environmental stressors, and aging factors are the main causes for defects of reinforced concrete in nuclear power plants (NPP). These defects are typically occurred as corrosion of reinforcement steel, delamination, cracks, malfunction of post-tensioning or steel composite systems etc. Some of the challenges for assessing the performance of these structures by nondestructive testing methods (NDT) are that the assessment could be performed only during the annual overhauls when testing is time-limited and uncertainty of the accuracy and reliability of the available NDT testing devices combined with the lack of the international uniformity of the methods used for NDT tests.To overcome these challenges, a mock-up wall representing a section of the concrete containment of the NPP. The mock-up wall included simulated defects, which mimic the most common types of defects in NPP concrete structures such as dimensional errors, honeycombing, delamination, defects adjacent to the steel liner and voids in grouted tendon ducts for the posttensionedstructures. This paper introduce the design and construction of the wall including the concrete properties, reinforcement, tendon ducts and the types of the simulated defects. The paper also introduces the NDT methods and techniques that are suitable for assessing the condition of the mock-up wall under the real environmental conditions. These techniques include mechanicalmethods as rebound hammer, ultrasonic and electromagnetic methods. This mock-up wall will enable to investigate reliably available NDT methods and experts’ skills providing also an important and very much need educational platform for future NDE experts.",
    keywords = "NDE, concrete, thick-walled, defects, deterioration, steel liner",
    author = "Fahim Al-Neshawy and Ferreira, {Rui Miguel} and Edgar Bohner and Teemu Ojala and Ville Sj{\"o}blom and Ernst Niederleithinger and Ute Effner and Jari Puttonen",
    year = "2019",
    language = "English",
    booktitle = "SMiRT 25, August 4-9, 2019, Charlotte, NC, USA",
    publisher = "International Assn for Structural Mechanics in Reactor Technology IASMiRT",
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    Al-Neshawy, F, Ferreira, RM, Bohner, E, Ojala, T, Sjöblom, V, Niederleithinger, E, Effner, U & Puttonen, J 2019, Design, construction, and NDT of a mock-up for reinforced concrete walls in NPP. in SMiRT 25, August 4-9, 2019, Charlotte, NC, USA: Division IX. International Assn for Structural Mechanics in Reactor Technology IASMiRT , International Conference on Structural Mechanics in Reactor Technology, SMiRT 25 , Charlotte, United States, 4/08/19.

    Design, construction, and NDT of a mock-up for reinforced concrete walls in NPP. / Al-Neshawy, Fahim; Ferreira, Rui Miguel; Bohner, Edgar; Ojala, Teemu; Sjöblom, Ville; Niederleithinger, Ernst; Effner, Ute; Puttonen, Jari.

    SMiRT 25, August 4-9, 2019, Charlotte, NC, USA: Division IX. International Assn for Structural Mechanics in Reactor Technology IASMiRT , 2019.

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    TY - GEN

    T1 - Design, construction, and NDT of a mock-up for reinforced concrete walls in NPP

    AU - Al-Neshawy, Fahim

    AU - Ferreira, Rui Miguel

    AU - Bohner, Edgar

    AU - Ojala, Teemu

    AU - Sjöblom, Ville

    AU - Niederleithinger, Ernst

    AU - Effner, Ute

    AU - Puttonen, Jari

    PY - 2019

    Y1 - 2019

    N2 - Construction methods, environmental stressors, and aging factors are the main causes for defects of reinforced concrete in nuclear power plants (NPP). These defects are typically occurred as corrosion of reinforcement steel, delamination, cracks, malfunction of post-tensioning or steel composite systems etc. Some of the challenges for assessing the performance of these structures by nondestructive testing methods (NDT) are that the assessment could be performed only during the annual overhauls when testing is time-limited and uncertainty of the accuracy and reliability of the available NDT testing devices combined with the lack of the international uniformity of the methods used for NDT tests.To overcome these challenges, a mock-up wall representing a section of the concrete containment of the NPP. The mock-up wall included simulated defects, which mimic the most common types of defects in NPP concrete structures such as dimensional errors, honeycombing, delamination, defects adjacent to the steel liner and voids in grouted tendon ducts for the posttensionedstructures. This paper introduce the design and construction of the wall including the concrete properties, reinforcement, tendon ducts and the types of the simulated defects. The paper also introduces the NDT methods and techniques that are suitable for assessing the condition of the mock-up wall under the real environmental conditions. These techniques include mechanicalmethods as rebound hammer, ultrasonic and electromagnetic methods. This mock-up wall will enable to investigate reliably available NDT methods and experts’ skills providing also an important and very much need educational platform for future NDE experts.

    AB - Construction methods, environmental stressors, and aging factors are the main causes for defects of reinforced concrete in nuclear power plants (NPP). These defects are typically occurred as corrosion of reinforcement steel, delamination, cracks, malfunction of post-tensioning or steel composite systems etc. Some of the challenges for assessing the performance of these structures by nondestructive testing methods (NDT) are that the assessment could be performed only during the annual overhauls when testing is time-limited and uncertainty of the accuracy and reliability of the available NDT testing devices combined with the lack of the international uniformity of the methods used for NDT tests.To overcome these challenges, a mock-up wall representing a section of the concrete containment of the NPP. The mock-up wall included simulated defects, which mimic the most common types of defects in NPP concrete structures such as dimensional errors, honeycombing, delamination, defects adjacent to the steel liner and voids in grouted tendon ducts for the posttensionedstructures. This paper introduce the design and construction of the wall including the concrete properties, reinforcement, tendon ducts and the types of the simulated defects. The paper also introduces the NDT methods and techniques that are suitable for assessing the condition of the mock-up wall under the real environmental conditions. These techniques include mechanicalmethods as rebound hammer, ultrasonic and electromagnetic methods. This mock-up wall will enable to investigate reliably available NDT methods and experts’ skills providing also an important and very much need educational platform for future NDE experts.

    KW - NDE

    KW - concrete

    KW - thick-walled

    KW - defects

    KW - deterioration

    KW - steel liner

    M3 - Conference article in proceedings

    BT - SMiRT 25, August 4-9, 2019, Charlotte, NC, USA

    PB - International Assn for Structural Mechanics in Reactor Technology IASMiRT

    ER -

    Al-Neshawy F, Ferreira RM, Bohner E, Ojala T, Sjöblom V, Niederleithinger E et al. Design, construction, and NDT of a mock-up for reinforced concrete walls in NPP. In SMiRT 25, August 4-9, 2019, Charlotte, NC, USA: Division IX. International Assn for Structural Mechanics in Reactor Technology IASMiRT . 2019