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Ultrasonic Pulse Velocity Test (UPV)

Ultrasonic Pulse Velocity (UPV) is a versatile non-destructive technique and is used in determination of concrete uniformity, detection of defects, estimation of concrete strength and surface crack depth. UPV is taken at or near the core location. Estimation of the in-situ concrete strengths is estimated based on limited in-situ UPV correlation and the core crushing results in conjunction with our correlation curve for the cast in-situ wall.

Ultrasonic Pulse Velocity measurements are carried out in accordance with BS EN 12504-4: 2004 “Determination of ultrasonic pulse velocity”. All measurements were taken by both direct and indirect transmissions. For the indirect transmission, the transmitting transducer was placed on a suitable point on the surface and the receiving transducer was placed on the surface at successive three positions at 100mm apart along a line. The centre-to-centre distance from the transmitting and receiving transducers was plotted against the transit time. The slope of the straight line obtained by linear regression drawn through these points gives the mean pulse velocity at the surface.

The measurement of UPV was carried out by using the equipment called PUNDIT with 54 kHz transducers. It works on the production of a pulse of longitudinal vibrations by an electro-acoustical transducer, which is held in contact with one surface of the concrete under test. After transversing a known path (L) in the concrete, the pulse vibrations are converted into an electrical signal by the second transducer. Electronic timing circuits enable the transit time (T) of the pulse to be measured.