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1996 Fiscal Year Final Research Report Summary

Study of the Treatment of Construction Joints in Concrete Using Water Jet Method

Research Project

Project/Area Number 07650554
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 構造工学・地震工学
Research InstitutionChiba Institute of Technology

Principal Investigator

ADACHI Ichiro  Chiba Institute of Technology, Faculty of Technology, Professor, 工学部, 教授 (40083878)

Co-Investigator(Kenkyū-buntansha) SAKODA Shigemi  Tokai University Scool of Marine Science and Technology, asistant prof., 海洋学部, 助教授 (50056230)
Project Period (FY) 1995 – 1996
KeywordsWater Jet / Rotary Jet / Surface Treatment / Vertical Joint / Bleeding / Ratio of the Flexural Strength / Depth of the Treatment / Strength of Construction Joint
Research Abstract

The aim of this study is to investigate the effectiveness of water jet cutting for the surface treatment of hardened concrete and to find out the bond strength of construction joints. The flexural strength ratio was used to evaluate the strength of construction joints. The ratio of the flexural strength of the speciments with construction joints to the strength of the specimens without construction joints was regarded as the flexural strength ratio.
The flexural strength ratios for vertical construction joints are generally lower than the horizontal construction joints because of being caused by the loss of adherence properties of concrete due to the formation of a thin water layr by bleeding. This study showed that the flexural strength ratio of the vertical construction joints were obtained ranging 80% and 90% when a rotary jet cutting methed was used and the depth of the indentations of surface treatment maintained a specified value. It can be seen from the experimental results that the suitable value of specified depth is more than 7mm.
The depth of surface treatment is mostly affected by the water pressure of the compressor.
The flexural strength ratios were not affected by the type of coarse aggregate and the water-cement ratio of old concrete.
AE signals were monitored during the tests of solid beams and jointed beams. AE events counts, amplitude distributions and wave form were obtained and the following tendencies were showed. AE event counts and long wave lengths were concentrated around vicinity of center of the beam as the load is close to the falure load. But large amplitude distributions and frequency were not affected by the construction joints.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] I.ADACHI,S.SAKODA and T.YAHIRO: "AN EXPERIMENTAL STUDY OF THE TREATMENT OF CONSTRUCTION JOINTS IN CONCRETE STRUCTURES USING WATER JET METHOD." Proceedings of The 4th Pacific Rim International Conference on WATER JET TECHNOLOGY.371-378 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 迫田、足立: "ウオータージェットを用いた新旧コンクリートの打継ぎに関する研究" コンクリート工学年次論文報告集. Vol.17,No.1. 1261-1266 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 足立、五十嵐、迫田: "新旧コンクリートの打継ぎ強度試験におけるAE計測." 第10回アコースチックエミッション総合コンファレンス論文集. 179-184 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 足立、五十嵐、迫田、八尋: "ウオータージェットを用いた新旧コンクリートの打継ぎに関する研究" コンクリート工学年次論文報告集. Vol.18,No.1. 1353-1358 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 五十嵐、足立: "AE法を用いた打継ぎコンクリートの破壊過程に関する一研究" 土木学会第50回年次学術講演会概要集. 408-409 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 足立、迫田: "表面処理工法が新旧コンクリートの打継強度に与える影響" 第23回セメント・コンクリート研究討論会論文報告集. 130-133 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] I.ADACHI,S SAKODA and T,YAHIRO: "AN EXPERIMENTAL STUDY OF THE TREATMENT OF CONSTRUCTION JOINTS IN CONCRETE STRUCTURES USING WATER JET METHOD." The Proceedings of The 4th Pacific Rim Int.Conf.on WATER JET TECHNOLOGY. 371-378 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.SAKODA,I.ADACHI: "Study on the Construction Joints of the New and Old Concrete in Concrete Structures Using Water Jet Method." The Proceedings of the J.C.I. Vol.17, No.1. 1261-1266 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] I.ADACHI,H.IGARASHI,S.SAKODA: "Acoustic Emission in the Construction Joints of New and Old Concrete." Proceedings of the 10th AE Conf.179-184 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] I.ADACHI,H.IGARASHI,S.SAKODA and T.YAHIRO: "Study On the Construction Joints of the New and Old Concrete in Concrete Structures Using Water Jet Method." The Proceedings of the J.C.I. Vol.18, No.1. 1353-1358

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

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Published: 1999-03-09  

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