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2002 Fiscal Year Final Research Report Summary

Development of non-destructive test of measuring the concrete crack depth

Research Project

Project/Area Number 12555079
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field 電力工学・電気機器工学
Research InstitutionTohoku Gakuin University

Principal Investigator

HAGA Akira  Tohoku Gakuin University, Faculty of Engineering, Professor, 工学部, 教授 (20048820)

Co-Investigator(Kenkyū-buntansha) YAMAZAKI Keita  Takenaka Corporation, Head researcher, 技術研究所, 主任研究員
KAWAKAWA Ken  Hachinohe Institute of Technology, Association professor, 工学部, 専任講師 (00244905)
OTSUKA Kouji  Tohoku Gakuin University, Faculty of Engineering, Professor, 工学部, 教授 (10048803)
Project Period (FY) 2000 – 2002
Keywordsconcrete / crack / non-destructive test / resonant frequency / input impedance / monopole antenna / exciting coil
Research Abstract

The main purpose in this study is to estimate the depth and inclination angle of a crack in concrete.
1. Magnetic powders were packed into a crack and magnetized with E-form or V-form ferrite core with a pick-up coil centered between the exciting coils. The magnitude and phase of the magnetic flux caused by the core packed with magnetic powders were measured. The experimental results show that the inclination angle could be clearly recognizes, and depth of the crack was determined to be half distance of exciting coil.
2. Conductive powders or liquid are packed into a crack and set up the ground plane of aluminum as thin as 2mm. N-type connector is mounted on a ground plane which inner conductor is in contact with conductive powders or liquid in a crack, and ground plane. Monopole antenna is composed of conductive material in a crack and ground plane. Input impedance of the monopole antenna was measured by network analyzer. The length of crack is odd number of quarter wavelength long, when the imaginary part will be zero.
That is
L = λ/4 = c/(4 × f_0 × √<ε_s> (1)
where λ is wavelength , L is the length of crack, c is the velocity of light, f_0 is resonant frequency, and ε_s is relative permittivity.
It is therefore possible to estimate the deep crack depth(1〜2m) in terms of the resonance frequencies.

  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] "コンクリートにおけるクラック深さの磁気的非破壊計測"日本応用磁気学会誌. 23. 1537-1540 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] "I-core及びV-coreによるコンクリートクラックの深さの磁気的非破壊検査法"東北学院大学工学部研究報告. 34. 67-71 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] "コンクリートのひび割れ深さのV字励磁を用いた磁気的非破壊検査法に関する検討"東北学院大学工学部研究報告. 36. 1-5 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] "Injection Material for Cracks with Combining Function of Repairing and X-ray Contrast"International Conference on Engineering Materials. 507-514 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] "コンクリートクラックの電気的非破壊検査法"東北学院大学工学部研究報告. 37. 9-13 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] "コンクリートのひび割れの非破壊検査の一検討"電気学会マグネティクス研究会. MAG-03-44. 25-29 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Haga, K.Otsuka, M.Sitou, S.Takahashi, H.Nasuno, and H.Matsuki: "Nondestructive Magnetic Measurement of the Depths of Cracks In Concrete"J. of the Magnetic Society of Japan. Vol.27, No.4-2. 1537-1540 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Tamura, K.Sato, R.Osaka, A.Haga, K.Otuka and H.Matuki: "A Study of Non-destructive Test of Concrete-crack by using I-core and V-core"Science and Engineering Reports of Tohoku Gakuin University. Vol.34, No.2. 67-71 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Haga, T.Tamura, and K.Otuka: "A study of Non-destructive Test by Using V-type magnetic exciting in Concrete-crack"Science and Engineering Reports of Tohoku Gakuin University. Vol.36, No.1. 1-5 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Kajiyama, A.Haga, T.Shiokawa, K.Otsuka and H.Matsuki: "Non-destructive Inspection of Concrete-crack"Science and Engineering Reports of Tohoku Gakuin University. Vol.37, No.2. 9-13 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Takeda and K.Otsuka: "Injection Material for Cracks with Combining Function of Repairing and X-ray Contrast"2001 Second International Conference on Engineering Materials. 507-514 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Kajiyama, A.Haga, T.Shiokawa, H.Nasuno and H.Matsuki: "A study of Non-destructive Inspection of Concrete-crack"The paper of Technical Meeting on Magnetic, IEE Japan. Mag-03-44. 25-29 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Tmamura, K.Sato, R.Osaka, A.Haga, K.Otuka and H.Matuki: "A study of Non-destructive Test of Concrete-crack by Using V-core"2000 National Convention Record I.E.E. Japan. (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Tmamura, A.Haga, K.Otsuka and H.Matsukio: "Non-destructive Inspection of Concrete-crack by Using V-core"Digests of the 24^<th> Annual Conference on Magnetics in Japan. (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Tmamura, A.Haga, K.Otsuka and H.Matsukio: "Magnetically Non-destructive Inspection of Concrete-crack by Using V-core"2000 Tohoku-Section join Convention Record of Institute of Electrical and Information Engineers, Japan. (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Kajiyama, A.Haga, T.Shiokawa, H.Nasuno and H.Matsuki: "Study of Depth measurement of Concrete-crack by using monopole antenna operation"2000 National Convention Record I.E.E. Japan. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Haga and K.Otsuka: "Magnetically Non-destructive Inspection of Concrete-crack"Patent. 11-64293. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Haga and K.Otsuka: "Magnetic Concrete"Patent. 2000-152143. (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Haga and K.Otsuka: "Electrically Non-destructive Inspection of Concrete-crack"Patent. 2001-161422. (2001)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2004-04-14  

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