Concrete NDT :-
Ultrasonioc Pulse Velosity Test
The ultrasonic pulse is generated by an
electroacoustical transducer. , When the pulse is
induced into the concrete from a transducer, it
undergoes multiple reflections at the boundaries
of the differ& t material phases within the concrete.
A complex system of stress waves is
developed which includes longitudinal ( compressional
), shear ( transverse ) and surface
( rayleigh ) waves. The receiving transducer
detects the onset of the longitudinal waves,
which is the fastest.
Because the velocity of the pulses is almost
independent of the geometry of the material
through which they pass and depends only on
its elastic properties, pulse velocity method is a
convenient technique for investigating structural
concrete.
