In this video, we will discuss the ultrasonic pulse velocity testing method and how it can help engineers in quality control of new construction as well as the inspection of existing concrete structures.
Ultrasonic Pulse Velocity (UPV) is an effective non-destructive testing (NDT) method for quality control of concrete materials, and detecting damages in structural components. The UPV methods have traditionally been used for the quality control of materials, mostly homogeneous materials such as metals and welded connections. With the recent advancement in transducer technology, the test has been widely accepted in testing concrete materials. Ultrasonic testing of concrete is an effective way for quality assessment and uniformity, and crack depth estimation. The test procedure has been standardized as “Standard Test Method for Pulse Velocity through Concrete” (ASTM C 597, 2016).
The concept behind the technology is measuring the travel time of acoustic waves in a medium, and correlating them to the elastic properties and density of the material. Travel time of ultrasonic waves reflects internal condition of test area. In general, for a given trajectory, higher travel time is correlated to low quality concrete with more anomalies and deficiencies, while lower travel time is correlated to high quality concrete with fewer anomalies. Once ultrasonic wave spreads within the test area, the wave is reflected in boundary of anomalies resulting in higher travel time. This results in higher transmission time (lower wave speeds) in poor quality concrete and lower transmission time (higher wave speed) in good quality concrete.
Applications of UPV Testing for Concrete | NDT Combined Methods SonReb
Several researchers and engineers have studied the use of ultrasonic testing of concrete in different engineering projects:
1- Pulse Velocity Determination
2- Concrete Quality Assessment
3- Establishing Homogenity and Uniformity of Concrete
4- Measurement of Surface Crack Depth
5- Prediction of Compressive Strength of Concrete
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