Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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A Study on the Statistical Distribution of Rebound Number and Ultrasonic Pulse Velocity in RC and PSC Concrete Structures

RC 및 PSC 콘크리트에서 반발도 및 초음파 속도의 변화에 대한 연구

  • Sa, Min-Hyung (Department of Safety and Environmental Systems Engineering, Incheon National University) ;
  • Yoon, Young-Geun (Department of Safety and Environmental Systems Engineering, Incheon National University) ;
  • Lee, In-Bok (Department of Safety and Environmental Systems Engineering, Incheon National University) ;
  • Woo, In-Sung (Department of Safety and Environmental Systems Engineering, Incheon National University) ;
  • Oh, Tae Keun (Department of Safety and Environmental Systems Engineering, Incheon National University)
  • Received : 2017.05.02
  • Accepted : 2017.07.10
  • Published : 2017.08.31
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Abstract

The rebound hammer test and the measurement of ultrasonic pulse velocity(UPV) have been widely used for the physical properties & condition evaluation of reinforced & prestressed concrete structures for a long time, but the acoustoelastic effects by the prestressing in the prestressed concrete structures on the rebound number and ultrasonic pulse velocity have not been studied clearly. Therefore, this study investigated the data distribution of the rebound numbers and ultrasonic pulse velocities in reinforced and prestressed concrete slabs of $3000{\times}3000mm$ with a thickness of 250 mm. Also, the Kolmogorov-Smirnov goodness-of-fit test was done in order to identify statistical consistency and reliability. The statistical analysis results show that the rebound number and ultrasonic pulse velocities increased about 1.9% and 2.5%, respectively when prestressing was applied. As expected, the UPV shows better statistical reliability and potential for in situ evaluation than the RB because the RB are more sensitive to testing posture, surface condition, temperature and humidity so on. The experimental data in this study can be used for the condition assessment of reinforced and prestressed concrete structures by the rebound number and ultrasonic pulse velocity.

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References

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