Pundit Lab - Ultrasonic Pulse Velocity Tester
To check the quality and strength of in-situ concrete in structural members, ultrasonic pulse velocity test is most recommended.
It is applied for the following purposes :-
The uniformity of a material
The existence of voids, cracks or other inner flaws or defects.
Changes in the concrete in due course because of the cement hydration, damage from fire, frost or chemical attach.
The durability or modulus of a material.
The quality of the concrete with regard to specified standard requirements.
It comprises of a pair of transducers (probes) with various frequencies, electrical pulse generator, electrical timing devices and cables.
It is supported with the through-transmission method. It comes with size 180 x 110 x 160 mm. It’s weight is 3 Kg.
Digital display with precision +_0.1 microseconds.
The following testing method is used with the machine :-
Pulse velocity is estimated in concrete with the arrangement of transducers across the member perfectly opposite to each other.
This method is considered as most perfect & authentic to determine the quality & strength of concrete. If there does not exist any other method, then this method will be suitable.
Semi Direct Transmission
Pulse velocity is estimated in concrete with the arrangement of transducers in planes perpendicular to each other.
This method is not so authentic to determine the quality/strength of concrete.
Process for estimation of pulse velocity :-
Velocity = (Distance travelled/path length)/Time taken
Pulse velocity in concrete will be demonstrated with Km/sec.
Proper correction factors should be used on the basis of site condition & factors which impact the velocity of pulse.