Ultrasonic pulse velocity test of concrete: It is a non-destructive test. The ultrasonic pulse velocity method as described for green concrete can also be used to determine the strength of hardened concrete. The flaws, quality of concrete, reinforcement, moisture content, temperature of concrete materials etc. affect the pulse velocity and suitable adjustments should be made in evaluating the concrete strength. Ultrasonic pulse velocity test is not used to measure the strength of wet concrete. Quality of concrete and pulse velocity: