Ultrasonic Pulse Velocity

UPV testing measures the speed of ultrasonic waves through concrete. Velocity correlates with elastic modulus and density: higher quality concrete transmits pulses faster than deteriorated or cracked concrete.

Three transmission modes are used: direct (opposite faces), semi-direct (adjacent faces), and indirect (same face). Indirect transmission enables crack depth estimation without coring.

Results are classified per IS 13311: above 4,500 m/s is excellent, 3,500 to 4,500 m/s is good, below 3,000 m/s is doubtful. UPV is used for comparative mapping, not standalone strength determination.