Evaluation of temperature influence on ultrasound velocity in concrete by coda wave interferometry

Abstract

Ultrasonic methods are valuable tools for the assessment of concrete quality and for imaging inclusions in concrete. In such applications, accurate and reliable determination of ultrasonic wave velocities as affected by various experimental and environmental factors is essential. In this research Coda Wave interferometry (CWI) was used to determine the influence of temperature (20 to 50° C) on ultrasonic wave velocity in concrete samples. A resolution of better than 10 -2% was achieved in the measurement of relative velocity changes. In addition the influence of sensor (transmitter and receiver) positioning errors on the results of the interferometric algorithm was evaluated. The presented results can be used to correct and refine data from monitoring systems, which may enable improved quality assessment and imaging by use of CWI. © RILEM 2013.