Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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Application of Nonlinear Ultrasonic Method for Monitoring of Stress State in Concrete

  • Kim, Gyu Jin (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology) ;
  • Park, Sun Jong (Department of Structural System & Site Safety Evaluation, Korea Institute of Nuclear Safety) ;
  • Kwak, Hyo Gyoung (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology)
  • Received : 2016.03.11
  • Accepted : 2016.04.20
  • Published : 2016.04.30
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Abstract

As the lifespan of concrete structures increases, their load carrying capacity decreases owing to cyclic loads and long-term effects such as creep and shrinkage. For these reasons, there is a necessity for stress state monitoring of concrete members. Particularly, it is necessary to evaluate the concrete structures for behavioral changes by using a technique that can overcome the measuring limitations of usual ultrasonic nondestructive evaluation methods. This paper proposes the use of a nonlinear ultrasonic method, namely, nonlinear resonant ultrasonic spectroscopy (NRUS) for the measurement of nonlinearity parameters for stress monitoring. An experiment compared the use of NRUS method and a linear ultrasonic method, namely, ultrasonic pulse velocity (UPV) to study the effects of continuously increasing loads and cyclic loads on the nonlinearity parameter. Both NRUS and UPV methods found a similar direct relationship between load level and that parameter. The NRUS method showed a higher sensitivity to micro-structural changes of concrete than UPV method. Thus, the experiment confirms the possibility of using the nonlinear ultrasonic method for stress state monitoring of concrete members.

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