Interesting question. As I know there is no standard specification for the compressive strength-nondestructive tests, however, let us wait for additional answers about this issue.
The rebound number(NDT- Rebound (Schmitz) hammer: ASTM C805-1997) for the cured cubes ranges from 11.5 - 60.3 and its corresponding compressive strength( BS 1881:Part 3:1970 specification) ranges from 10.0 N/mm2 - 43.5N/mm2 . Higher the rebound number(NDT) results higher the compressive strength value and vice versa. The compressive strength and rebound number(NDT) were also seen to increase with curing age from literature study.
Typically sidewalk concrete is about 3,000 psi Compressive strength,
and concrete used in Bridge girders cast in the winter months get to about 8,000 psi, but I had one project where the girders were cast in the summer months, and they attained 13,000 psi compressive strength, and they refused to camber up. Typically most ordinary concrete gets between
4500 psi and 5,000 psi compressive strength. Concrete strength depends
upon a lot of factors.
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