Answer Posted / awadhoot

3000 PSI concrete strength equals to 20 N/Sqmm.
characteristic compressive strength of concrete.

Now refer to Table 9 "Proposrtions for Nominal mix
concrete", on Page no. 23 of IS 456:2000.

Here, for M20 grade concrete, the total quantity of dry
aggregates by mass per 50 Kg of cement is given as 250 Kg.

Considering proportion of fine to coarse aggregates as 1:2,
Fine Aggregates can be calculated as 83 Kg. Say 100 Kg, then
coarse aggregates will be 150 Kg.

Quantity of water per 50 kg bag of cement can be allowed up
to 30 litre to the Max. However, target slump of 75-100mm
can be achieved by following trial and error method.

Hence, for 1:2:3 proportion of concrete,
Cement:Fine Aggregates:Coarse Aggregates
50Kg : 100Kg. : 150Kg.

Here Fine Aggregates = sand and
Coarse Aggregates= gravel

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