Answer / guest

These mixes doesn't have any ready-made ratio's available like M20,M25. usually they are specified by mix design.
(eg: IS 10262-2009)

Answer / hiren

1:2:4=M15
1:1.5:3=M20
1:1:2=M25

Answer / innocent francis

FOR M30, the fundamental ratio is 1:1:2,above that the mix design will give the guide.

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