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About the Possible Limitations in the Usage of the Non-Destructive Ultrasonic Pulse Velocity Method for Assessment of Cracks in Reinforced Concrete Structures, Subjected to Direct Environmental Exposure

1
Department Reinforced Concrete Structures, Faculty of Structural Engineering, University of Architecture, Civil Engineering and Geodesy (UACEG), 1164 Sofia, Bulgaria
2
Department Building Structures, Faculty of Construction, University of Structural Engineering &Architecture, 1373 Sofia, Bulgaria
*
Author to whom correspondence should be addressed.
Buildings 2019, 9(9), 202; https://doi.org/10.3390/buildings9090202
Received: 29 June 2019 / Revised: 15 August 2019 / Accepted: 29 August 2019 / Published: 11 September 2019
Failures occur in the structures of reinforced concrete buildings and facilities during their continuous exploitation, without being overloaded or exposed to extreme impacts, the most common being cracks. Their detection and change in time are related to the assessment of the state of the structures, their safety, and reliability during their construction and especially for their safety exploitation. This paper describes the results of the experimental studies conducted by authors aiming to verify the possibility of using the non-destructive ultrasonic pulse velocity method (NDUPVM) for detection and evaluation of cracks. Results of an experimental study of 12 reinforced concrete beams are presented. In previous experiments, some of them were subjected to bending until the maximum crack width of 0.3 mm was reached and others until yielding of the longitudinal reinforcement. The results obtained from the measurements of the depths of the normal cracks with different widths with NDUPVM were compared with the visually measured ones. In the present research cracks with the same width and with a similar depth were chosen. The influence of extreme external conditions to the accuracy of the measured crack depths by the NDUPVM was investigated. Non-destructive ultrasonic research was done by a portable device Proceq TICO. View Full-Text
Keywords: cracks; defects; reinforced concrete; non-destructive testing; ultrasonic testing cracks; defects; reinforced concrete; non-destructive testing; ultrasonic testing
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Ivanchev, I.; Slavchev, V. About the Possible Limitations in the Usage of the Non-Destructive Ultrasonic Pulse Velocity Method for Assessment of Cracks in Reinforced Concrete Structures, Subjected to Direct Environmental Exposure. Buildings 2019, 9, 202.

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