Hello all my friends for making concrete there are three different materials required that is Cement, sand and Aggregate for any concrete work of Different forms like Columns Beams Slab and Footing with different grades of concrete at different proportion.
In this article we will learn how to calculate cement sand and aggregate in column for grade of M20 and also how taking out quantity of cement sand and aggregate in a column.
Here we have the dimension given for front section of column is 375 x 275 mm and the height for cross section of the plan is 3.1 m.
As given M20 Grade of concrete of ratio 1:1.5:3 and if we sum up ratio will be 5.5
Some Important point for calculation:-
Density of cement = 1440 kg / m3
Density of sand = 1450 – 1500 kg / m3
Density of aggregate = 1450 – 1550 kg / m3
Weight of cement in bag = 50 kgs
Volume 1 bag of cement for 1 cum = 0.00347 cubic meter
Volume of 1 bag of cement in cubic ft. = 1.226 cubic ft.
Number of cement bag in 1 cum = 28.8 nos
How many cft in 1 cum = 35.28 cft.
Now the volume of column that is represented as V = 0.375 x 0.275 x 3.1 = 0.319 meter cube
It is required to convert wet volume in to dry volume we will have to apply the following formula :-
wet volume x 1.54 ( 1.54 is constant )
= 0.319 x 1.54 = 0.49 meter cube
Quantity of cement
Dry volume x ratio of cement / sum of ratio
= 0.49 x 1 / 5.5
= 0.089 cum
Quantity of cement in kg = 0.089 x 1440 = 128.16 kgs
quantity of cement in bags = 158.16 / 50 = 2.56 bags
Quantity of sand
= 1.5 x 0.49 / 5.5 = 0.13 cum
quantity of sand in cubic ft. = 0.13 x 35.28 = 4.71 cubic ft.
Quantity of Aggregate
= 3 x 0.49 / 5.5 = 0.26 cum
Quantity of Aggregate in cubic ft. = 0.26 x 35.28 = 9.42 cubic ft.
Quantity of water
Let us consider water cement ratio = 0.45
water required for 1 bag of cement = 0.45 x 0.00347 ( volume of 1 bag of cement is 0.00347 )
= 0.156 cum
1 cubic meter is 1000 liter
water required for 1 bag of cement = 0.0156 x 1000 = 15.6 liter
water required for = 2.56 x 15.6 = 39.93 liter
Conclusion:-
For M20 grade of concrete of column ( 375 x 275 ) mm size
Cement = 2.56 bags
Sand = 4.71 cubic ft.
Aggregate = 9.42 cubic ft.
