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2006 Fiscal Year Final Research Report Summary

Practical Research Work on Diagnosis and Strengthening for ASR Deteriorated Bridge Piers with Fracture of Steel Reinforcement

Research Project

Project/Area Number 16360218
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Civil engineering materials/Construction/Construction management
Research InstitutionKanazawa University

Principal Investigator

TORII Kazuyuki  Division of Natural Science & Technology, Professor, 自然科学研究科, 教授 (50115250)

Co-Investigator(Kenkyū-buntansha) KAJIKAWA Yasuo  Division of Natural Science & Technology, Professor, 自然科学研究科, 教授 (00089476)
MASUYA Hiroshi  Division of Natural Science & Technology, Professor, 自然科学研究科, 教授 (20157217)
KUBO Yoshimori  Division of Natural Science & Technology, Associate Professor, 自然科学研究科, 助教授 (50324108)
Project Period (FY) 2004 – 2006
KeywordsAlkali Silica reaction (ASR) / Reactive Aggregate / Fracture of Steel Reinforcement / Bridge Pier / Strengthening / Repair / Monitoring / Non-destructive Inspection
Research Abstract

Research results obtained in this study are summarized as follows ;
(1)Investigation on fracture of steel bars in ASR-affected structures
Research works revealed that the embrittle fracture of steel bars at the bending corner of stirrup or bent-up steel bars, due to excessive expansion of concrete due to ASR, occurred in the pillow beam or footing of piers and the abutment in bridges located in Ishikawa Prefecture, leading to the significant loss of structural integrity of concrete elements.
(2)Mechanisms of fracture of steel bar due to ASR
In the pillow beam or foundation of bridge pier, a lot of stirrup steel bars fractured at the bending corners, without any elongation of steel bar. The fracture surface of steel bar seemed to be very flat and smooth, which indicated the typical embrittlement fracture of steel bar. Whether or not the fracture of steel bars may be associated with the stress corrosion cracking and/or the hydrogen embrittlement fracture was discussed.
(3)Asset management for ASR-deteriorated bridges
For all bridge piers located in Ishikawa prefecture, which is considered to be the most serious ASR case in Japan, the degree of deterioration of bridge pier due to ASR was investigated by the visual inspection of cracking. Corresponding to the classification of ASR deterioration level of each bridge pier, the repair/strengthening method and maintenance procedure were proposed.
(4)Strengthening and monitoring of ASR-deteriorated bridge piers
In the case study of the pillow beam of Kashima Bridge and the foundation of Tokuda No.2 Bridge in Ishikawa Prefecture, the degree of deterioration of bridge pier due to ASR was also investigated by the non-destructive inspection. Based on the classification of ASR deterioration level of each element, the most appropriate strengthening methods were adopted for them. In the maintenance of these bridges, the monitoring using crack sensors was successfully applied in order to ensure the daily safety of these bridges.

  • Research Products

    (12 results)

All 2006 2005 2004

All Journal Article (12 results)

  • [Journal Article] Strengthening and Monitoring Techniques of ASR Affected Bride Piers2006

    • Author(s)
      Torii, K., Daidai, T.
    • Journal Title

      Proc. of 22^<nd> ARRB (CD-R)

      Pages: 11

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Evaluation of Residual Expansion Capacity of Concrete Using Cores from ASR Affected Structures2006

    • Author(s)
      Nomura, M., Torii, K.
    • Journal Title

      Proc. of 22^<nd> ARRB (CD-R)

      Pages: 10

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Strengthening and Monitoring Techniques of ASR Affected Bride Piers2006

    • Author(s)
      Torii, K., Daidai, T.
    • Journal Title

      Proc. of 22nd ARRB (CD-R)

      Pages: 11

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Evaluation of Residual Expansion Capacity of Concrete Using Cores from ASR Affected Structures2006

    • Author(s)
      Nomura, M., Torii, K.
    • Journal Title

      Proc. of 22nd ARRB (CD-R)

      Pages: 10

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Proposal for Evaluation Method of Assessing Alkali-silica Reactivity of Concrete by Accelerated Curing Method2005

    • Author(s)
      Nomura, M, Torii, K
    • Journal Title

      Proc. of CONMAT' 05 (CD-R)

      Pages: 11

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Proposal for Evaluation Method of Assessing Alkali-silica Reactivity of Concrete by Accelerated Curing Method2005

    • Author(s)
      Nomura, M, Torii, K.
    • Journal Title

      Proc. of CONMAT' 05 (CD-R)

      Pages: 11

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] 北陸地方の反応性骨材の岩石学的特徴と骨材のアルカリシリカ反応性試験の適合性2004

    • Author(s)
      鳥居和之, 野村昌弘, 本田貴子
    • Journal Title

      土木学会論文集 No.767

      Pages: 185-197

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] アルカリシリカ反応と海水の複合的な作用によるコンクリートの劣化現象とその評価手法の提案2004

    • Author(s)
      羽渕貴士, 鳥居和之
    • Journal Title

      土木学会論文集 No.784

      Pages: 149-161

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Serious Damages on ASR Affected RC Bridges Piers and Their Strengthening2004

    • Author(s)
      Torii, K., Sannoh, C., Kubo, Y., Ohashi.Y.
    • Journal Title

      Proc. of 12^<th> Inter. Conf. on Alkali-aggregate Reaction in Concrete Vol.2

      Pages: 1283-1288

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Petrographic Features of Alkali-silica Reactive Aggregates in Hokuriku District and Compatibility between Various Test Methos Determining Alkali-silica Reactivity of Aggregate (in Japanese)2004

    • Author(s)
      Torii, K, Nomura, M, Honda, A.
    • Journal Title

      Journal of Materials, Concrete Structures and Pavements, Japan Society of Civil Engineers No. 746/V-64

      Pages: 185-197

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Deterioration of Concrete Caused by Combined Action of Alkali-silica Reaction and Sea Water Attack and Its Evaluation Method (in Japanese)2004

    • Author(s)
      Habuchi, T., Torii, K.
    • Journal Title

      Journal of Materials, Concrete Structures and Pavements, Japan Society of Civil Engineers No. 774/V-65

      Pages: 149-161

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Serious Damages on ASR Affected RC Bridges Piers and Thei Strengthening2004

    • Author(s)
      Torii, K., Sannoh, C., Kubo, Y., Ohashi, Y.
    • Journal Title

      Proc. of 12th Inter. Conf. on Alkali-aggregate Reaction in Concrete Vol. 2

      Pages: 1283-1288

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

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Published: 2008-05-27  

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