Smart Structures and Systems

  • 제17권1호
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  • Pages.73-89
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  • 2016
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  • 1738-1584(pISSN)
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  • 1738-1991(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Investigation of influences of mixing parameters on acoustoelastic coefficient of concrete using coda wave interferometry

  • Shin, Sung Woo (Department of Safety Engineering, Pukyong National University) ;
  • Lee, Jiyong (Daewoo Engineering & Construction Company) ;
  • Kim, Jeong-Su (Hanwha Research Institute of Technology) ;
  • Shin, Joonwoo (Division of Navigation Science, Korea Maritime and Ocean University)
  • 투고 : 2014.03.06
  • 심사 : 2015.09.02
  • 발행 : 2016.01.25
⟨ 이전 논문 다음 논문 ⟩

초록

The stress dependence of ultrasonic wave velocity is known as the acoustoelastic effect. This effect is useful for stress monitoring if the acoustoelastic coefficient of a subject medium is known. The acoustoelastic coefficients of metallic materials such as steel have been studied widely. However, the acoustoelastic coefficient of concrete has not been well understood yet. Basic constituents of concrete are water, cement, and aggregates. The mix proportion of those constituents greatly affects many mechanical and physical properties of concrete and so does the acoustoelastic coefficient of concrete. In this study, influence of the water-cement ratio (w/c ratio) and the fine-coarse aggregates ratio (fa/ta ratio) on the acoustoelastic coefficient of concrete was investigated. The w/c and the fa/ta ratios are important parameters in mix design and affect wave behaviors in concrete. Load-controlled uni-axial compression tests were performed on concrete specimens. Ultrasonic wave measurements were also performed during the compression tests. The stretching coda wave interferometry method was used to obtain the relative velocity change of ultrasonic waves with respect to the stress level of the specimens. From the experimental results, it was found that the w/c ratio greatly affects the acoustoelastic coefficient while the fa/ta ratio does not. The acoustoelastic coefficient increased from $0.003073MPa^{-1}$ to $0.005553MPa^{-1}$ when the w/c ratio was increased from 0.4 to 0.5. On the other hand, the acoustoelastic coefficient changed in small from $0.003606MPa^{-1}$ to $0.003801MPa^{-1}$ when the fa/ta ratio was increased from 0.3 to 0.5. Finally, it was also found that the relative velocity change has a linear relationship with the stress level of concrete.

키워드

과제정보

연구 과제 주관 기관 : Pukyong National University

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