Answer / abha baghel

M is use for mix. 20 is the charactristic compressive
strength of concrete of 15 cm. cubes at 28 days in N/mm^2

Answer / ashis malakar

M means mix and 20 means characteristics compressive
strength of concrete after 28 days perfect curing.(in N/mm2)

Answer / sneha rai

In the designation of concrete mix M mfm to the mix and the
number to the specified compressive strength of 150 mm size
cube at 28 days, expressed in N/mn?.

Answer / k s naveen

M denotes the mix & 20 denotes the charecterestic compressive strength of concrete at the end of 28 days curing is not less than 20N/mm^2

Answer / gautam kumar

What means of bending moment in concrete

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