How to calculate quantity of reinforcement by formula?

Now its time gone to remember all the unit weight …

Just remember a simple formula and get all the unit weight of reinforcement ..

And the formula is …..

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(D^2)/162.28

Ex.. Assume we want to calculate Quantity of 8mm bars…

        Quantity= 8*8/162.28

                          =0.222kg/m

By this method we can calculate quantity of all the reinforcement…..

How to calculate quantity of reinforcement by formula?

How to calculate quantity of cement?

Suppose we take M20 grade concrete…

M20 = 1:1.5:3

Volume = 1+1.5+3=5.5

Total volume ingredients for using =1.57

Volume of broken stone Require = (3/5.5) x 1.57 = 0.856 m3

Volume of sand Require = (1.5/5.5) x 1.57 = 0.471 m3

Volume of cement = (1/5.5) x 1.57 = 0.285 m3

= 0.285 x1440 = 411 kg

For 1m3 of M20 (1:1.5:3)

Broken stone = 0.856 m3

Sand = 0.472 m3

Cement = 8.22 bag

you can simply calculate quantity of cement of all the grade of concrete by mentioned method….

How to calculate quantity of cement?