비파괴검사학회지 (Journal of the Korean Society for Nondestructive Testing)

  • 제27권6호
  • /
  • Pages.501-508
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  • 2007
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  • 1225-7842(pISSN)
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  • 2287-402X(eISSN)
한국비파괴검사학회 (The Korean Society for Nondestructive Testing)
권호 표지

Monitoring of Strength Gain in Concrete Using Smart PZT Transducers

  • Qureshi, Adeel Riaz (Smart Infrastructure Technology Center, Department of Civil and Environmental Engineering, KAIST) ;
  • Shin, Sung-Woo (Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign) ;
  • Yun, Chung-Bang (Smart Infrastructure Technology Center, Department of Civil and Environmental Engineering, KAIST)
  • 발행 : 2007.12.30
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초록

This paper presents the feasibility of using electromechanical impedance based active sensing technique for nondestructive strength gain monitoring of early-age concrete by employing piezoelectric lead-zirconate-titanate (PZT) patches on concrete surface. The strength development of early age concrete is actively monitored by performing a series of experiments on concrete specimens under moist curing condition. The electrical admittance signatures are acquired for five different curing ages and compared with each other. The resonant frequency shifts of PZT patches with increasing days is observed which is on account of additional stiffening due to strength gain of concrete during curing and level of stiffening being related to strength obtained from compression tests on companion cylinder specimens. The proposed approach is found to be suitable for monitoring the development of compressive strength in early-age concrete. It is also observed in this study that root mean square deviation (RMSD) in admittance signatures of the PZT patches can also be used as an indicator of concrete strength development.

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참고문헌

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