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Answer Posted / vikas chauhan
M refers to MIX means symbol M denote MIX.
& number 20 denote the "CHARACTERISTIC COMPRESSIVE STRENGTH" in N/mm^2 or MPa after 28 days curing.
Means 20 N/mm^2 or 20 MPa (Mega Pascal)is the "characteristic compressive strength" of concrete after 28 days curing.
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