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Assessment of Ultrasonic Pulse Velocity Method for Early Detection of Frost Damage in Concrete

콘크리트의 초기동해 진단을 위한 초음파 속도법의 적용 가능성 평가

  • Moon, Sohee (School of Architectural, Civil, Environmental, and Energy Engineering, Kyungpook National University) ;
  • Lee, Taegyu (Department of Fire and Disaster Prevention, Semyung University) ;
  • Choi, Heesup (Department of Civil and Environmental Engineering, Kitami Institute of Technology) ;
  • Choi, Hyeonggil (School of Architecture, Kyungpook National University)
  • Received : 2024.01.08
  • Accepted : 2024.02.07
  • Published : 2024.04.20

Abstract

This research delves into the evaluation of the suitability of ultrasonic pulse velocity as a diagnostic tool for early detection of frost damage in concrete. The investigation involves the measurement of compressive strength and ultrasonic pulse velocity concerning the depth of freezing for individual mortar specimens, followed by an analysis of their microstructure and their interrelation. The findings indicate a consistent decrease in both compressive strength and ultrasonic pulse velocity with increasing freezing depth. Furthermore, a correlation between compressive strength and ultrasonic pulse velocity concerning the depth of early frost damage is established. Consequently, the study asserts the potential of utilizing the ultrasonic pulse velocity method for early detection of frost damage in concrete, with prospects for quantifying the depth of damage through further research endeavors.

본 연구에서는 초음파 속도법을 콘크리트의 초기동해 피해를 진단하기 위한 방법으로서의 적용 가능성을 평가하기 위해 모르타르 시험체를 대상으로 각각 동결 깊이에 따른 압축강도와 초음파 펄스 속도를 측정하여 미세구조와 그 상관관계를 분석하였다. 그 결과, 동결 피해를 입은 모르타르 시험체와 피해를 입지 않은 시험체 간의 압축강도와 초음파 펄스 속도 값의 차이가 확연하게 나타났으며, 미세구조 분석을 통해 동결 깊이가 증가할수록 초기동해 피해를 더 많이 받아 압축강도와 초음파 펄스 속도가 감소하였다고 판단할 수 있었다. 회귀분석을 통해 상관관계를 분석한 결과, 추정식과 실험값과의 관계성을 나타내는 결정계수( R2)가 0.87로 얻어져 초기동해 피해 깊이에 따른 압축강도와 초음파 펄스 속도 사이의 상호 연관성이 존재하는 것으로 분석된다. 이에 따라 초음파 속도법을 통한 콘크리트의 초기동해 피해 진단이 가능하며, 그 피해 깊이를 정량적으로 진단하기 위해서는 향후 추가적인 연구가 필요할 것으로 판단된다.

Keywords

Acknowledgement

This research was funded by the Korea Agency for Infrastructure Technology Advencement(KAIA) grant funded by the Korean government(MOLIT)(grant number RS-KA162704) and the National Research Foundation of Korea(NRF) grant funded by the Korea government(MSIT)(NRF-2021R1C1C1011347).

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