As per IS 13311 (Part 1), in the ultrasonic test for hardened concrete, good quality of concrete is indicated if the pulse velocity is:

1
3.0 km/s to 3.5 km/s
2
3.5 km/s to 4.5 km/s
3
Above 4.5 km/s
4
Below 3.0 km/s

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