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Study on Inspection of Void in Concrete by Impact Test

Research Project

Project/Area Number 15K05869
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Dynamics/Control
Research InstitutionOsaka City University

Principal Investigator

Kawai Tadao  大阪市立大学, 大学院工学研究科, 教授 (20177637)

Project Period (FY) 2015-04-01 – 2018-03-31
Project Status Completed (Fiscal Year 2017)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2016: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Keywords打撃試験 / コンクリート構造物 / 浮き / 独立成分分析 / 位置推定
Outline of Final Research Achievements

We investigated the method of detecting a void in the concrete structure by the impact test. The shock waves generated by hitting the concrete propagates along a surface and through the inside of a concrete. Sensors placed on several locations apart from the impact point measure both a surface wave and a wave passing through internal concrete. We separated a internal wave from a surface wave by the method of the independent component analysis to detect a void.
At first, we checked the effectiveness of the method by simulation. Then we made a test system. Our system was composed of a impact part and sensor parts. At a impact part, a steel ball was shot by a spring to a concrete surface. At sensor parts, a small block attached an acceleration sensor was pressed to a concrete surface by a heavy mass. By this way, high frequency components of a shock wave were measured. At last, our test equipment showed a good performance to detect a void in a concrete structure.

Report

(4 results)
  • 2017 Annual Research Report   Final Research Report ( PDF )
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (1 results)

All 2018

All Presentation (1 results)

  • [Presentation] 打撃試験によるコンクリートの浮き検査2018

    • Author(s)
      川合忠雄、廣藤 貴浩
    • Organizer
      日本機械学会 D&D2018
    • Related Report
      2017 Annual Research Report

URL: 

Published: 2015-04-16   Modified: 2019-03-29  

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