Qualitative assessment of concrete by ultrasound tomography

Ultrasonic tomography is a non-destructive method that enables the mapping of an internal section of a structure from multiple projections for the identification of discontinuities and/or damages. This study addresses the application of the ultrasonic tomography method for the qualitative assessment of concrete. Several experimental tests with variations in concrete composition, presence of voids, arrangement and frequency of transducers were conducted on concrete prisms. The results show the ultrasonic tomography was more efficient than conventional ultrasonic tests. Analyses of several transducers arrangements revealed a large number of measurements not necessarily returns better images. The great potential of the ultrasonic tomography technique for the evaluation of homogeneity and detection of discontinuities and damages of concrete structures has been confirmed. (C) 2016 Elsevier Ltd. All rights reserved. (AU)