Points to be kept in mind:
Density of Cement = 1440 kg/m^3
Density of Aggregates = 1450-1550 kg/m^3
Sand Density = 1450-1550 kg/m^3
Weight of 1 bag of Cement = 50 kg
Volume of 1 bag of cement = 34.7 liters = 0.0347 cubic meters = 1.226 cubic feet.
No of bags in 1 cubic meter = 28.8 bags
Specific gravity of cement = 3.15
Grade of cement = 33, 43 and 53 ( where 33, 43 and 53 is the compressive strength of cement in N/mm^2)
Grade M-20 Concrete - Ratio = 1 : 1.5 : 3 - Sum=5.5
Here M refers to Mix and 20 is its compressive strength.
Let us consider Volume of Concrete = 1 m^3
Now for Dry Concrete Volume will be = 1.54 m^3
Now Calculate Cement, Sand and Aggregate
1) Cement
Cement = 1.54 X 1/5.5 = 0.28 m^3
Density of Cement = 1440 kg/m^3
Weight of Cement = 1440 X 0.28 = 403.2
No of bags = 403.2/50 = 8
2) Sand
Sand = 1.54 X 1.5/5.5 = 0.42 m^3
Density of sand = 1450 kg/m^
Weight of sand = 1450 X 0.42 = 609 kg
3) Aggregate
Aggregate = 1.54 X 3/5.5 = 0.84 cubic meters
Density of aggregates = 1500 kg/m^3
Weight of aggregates = 1500 X 0.84 = 1260 kg.
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