Answer Posted / sudiptodas

Nominal
It is the fixed ratio of Cement:sand:coarse
in this case we assume that the cement sand matrix may fill up all the gap between the coarse
in general it comes like
M5=1:4:8
M10=1:3:6
M15=1:2:4
M20=1:1.5:3
M25=1:1:2
as per IS:456:2000
Design mix
in general the cement sand matrix dose not fill the gaps between coarse and thats result more void less strength
to overcome this fact few correction are made to design concert are called mix design
the step of design as follow

*suggested value of stranded deviation
*target strength of mix design
*select w/c ratio with the help of graph etc.
please fined IS:10262:2004 for any further details

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