Nondestructive Testing of Hardened Concrete Using Ultrasonic Pulse Velocity

Описание: https://www.globalgilson.com/proceq-p...

Key Moments
Intro: 00:04
Past Testing Techniques: 00:26
How Modern UPV Testing Works: 00:50
UPV Calculation: 02:01
Pundit UPV Instrument: 03:00

It’s no easy task to evaluate concrete structures for concealed flaws and defects.

Behind finished concrete surfaces could be voids, honeycombing, freeze-thaw damage, cracks, and inclusions. Even visible cracks are hard to assess without knowing their true depth and extent.

Sonic methods of flaw detection of hardened concrete have been practiced for centuries, dragging heavy chains across the surface or tapping with hammers to listen for acoustic differences. However, the information gleaned from these methods is incomplete AND at times hard to interpret.

Modern Ultrasonic Pulse Velocity instruments, or UPV, take an approach remarkably similar to old sonic methods.

Timed electronic pulses, or taps, are sent through the concrete from a transmitter. That generated acoustic signal is then picked up by a receiver, where the UPV instrument measures the transit time of the acoustic signal from the transmitter to the receiver.

The acoustic signal is affected by two factors, the density of the concrete material and interruptions in the acoustic signals’ travel path.

Following test specification (ASTM C597), the UPV procedure can determine several characteristics of the concrete, including the location and relative size of air voids, honeycombed areas, and inclusions; size and depth of cracks; uniformity of the concrete matrix; and finally, the UPV procedure can measure changes over time as well as concrete strength correlations.

The pulse velocity is calculated by dividing the distance of the transmitter and the receiver, by the transit time of the acoustic signal. (V = L/T Where: V = Pulse velocity in meters per second, L = Distance between centers of the transducer faces, in meters, T = Transit time in seconds)

Calculating pulse velocity is pretty straightforward, but accuracy is dependent on precise length measurements provided by the operator and the transit time as measured by the Ultrasonic Pulse Velocity instrument.

Gilson’s Pundit Ultrasonic Pulse Velocity instruments by Proceq meet ASTM, ISO, and EN test specifications, not only to measure pulse velocity, detect voids, and measure cracks, but have innovative and advanced testing capabilities for elastic Modulus (E-Mod), Poisson's ratio and estimating the concrete compressive strength (By combining test results from UPV and concrete test hammer instruments).

The Pundit Plus instrument is a digitally updated version of the traditional UPV device, providing up-to-date circuitry, data collection and storage, and network connectivity where the signal can be viewed directly on the device or exported to a PC for signal analysis and manual triggering.

And the Pundit PL-200 UPV instrument adds a touchscreen controller AND displays waveforms and data points visually. This top-of-the-line device can build and display maps of scanned areas showing pulse velocity variations to identify areas of concern.

The Ultrasonic Pulse Velocity instruments by Proceq can be applied to laboratory samples or concrete surfaces in the field AND causes no damage or disturbance to concrete materials.

For any questions about the Gilson Ultrasonic Pulse Velocity instruments by Proceq, or for any Gilson product, please contact your Gilson Technical Support Team.

https://www.globalgilson.com/proceq-p...






ultrasonic pulse velocity test pdf / ultrasonic pulse velocity test concrete pdf / ultrasonic pulse velocity test lab report / ultrasonic pulse velocity test values / pulse velocity formula / ultrasonic pulse velocity test lab manual / ultrasonic pulse velocity test procedure / how to convert velocity of upv test to compressive strength / testing of harden concrete using ultrasonic pulse velocity meter / testing of hardened concrete using ultrasonic pulse velocity test / testing of hardened concrete using ultrasonic pulse velocity test procedure / testing of hardened concrete using ultrasonic pulse velocity concrete