The characteristic compressive strength of M30 grade concrete as per IS : 456-2000 is

30 MPa (or N/mm²)

Explanation:

1. M30 refers to Mix Design Concrete with a compressive strength of 30 MPa after 28 days of curing.
2. Characteristic Strength (fck): It is the value below which not more than 5% of test results are expected to fall.

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