Answer / selvaraj

I can find this qty by two methods volume basis and weight basis.
Volume basis-ex m15 is 1:2:4 .sum all and kept on detominator and the what mat will be req us ,put on value top.for cement (1/7)x1440.its give kg/m3.

Answer / ravi pratap singh tomar

Concrete Mix Design is the name of procedure...it can be performed by BIS or ASTM standerds.
things to be known/assumed:-
1.compressive strength of 28days
2.maximum size and type of aggegate
3.degree of qulity of controll,workability and
4. type of exposure/type of cement etc
procedure:-
1. find target mean strength-by Ft=Fck+1.65*s(s-std deviation ,varries w.r.t grade of conc.)
2. water cement ratio- this find with the help of a graph W/C ratio Vs Fck.approximate air contant s found by another table wrt aggre gates s max size.(genrally-0.6to .35)
3.find workabiliti den multiply by 0.8follow a table to find zone nd % of sand .
4.now cement ,voids sand water are known along with total aggregate then finally using a specific formula given in BIS course and fine aggregates r also estimated.

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