Answer Posted / shalu verma

THERE ARE TWO TYPES OF MIXES:-
1-NOMINAL MIX
2-DESIGN MIX

1-NOMINAL MIX < M30 -ITS ALSO CALLED NOMINAL CONCRETE
2-DESIGN MIX >= M30 - ITS ALSO CALLED CONTROLLED CONCRETE.


SO, M20 IS A NOMINAL MIX AND ITS RATIO IS 1:1.5:3 AND ITS
STRENGHT IS 20 N/MM2.

M30 & M40 ARE DESIGN MIX AND ITS HAS NOT ANY RATIO THESE
ARE MEASURED BY THERE STRENGHT WHICH ARE 30 N/MM2 AND
40 N/MM2 RESPECTIVLY.

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