Ultrasonic Pulse Velocity Test
UPV is an in-situ ,non destructive test to check the quality of concrete and natural rocks.In this test the strength and quality of concrete or rock is assessed by measuring the velocity of an ultrasonic pulse passing through a concrete structure or natural rock formation.The test is conducted by passing a pulse of ultrasonic through concrete and measuring the time taken by pulse to get the structure.
Process
This test is conducted by passing a pulse of ultrasonic through concrete and measuring the time taken by pulse to get through the structure.Higher velocities indicate good quality and continuity of the material while slower velocities indicate concrete with many cracks or voids. It has a frequency in the range of 40khz to 50 khz and a pulse reception circuit that receives the signal.
Factors affecting ultrasonic pulse velocity test
Path length.
Lateral Dimensions of the specimen.
Presence of reinforcement of steel.
Moisture content of the concrete.
Uniformity of concrete.
Temperature of concrete.