05/04/2017
CALCULATION OF MATERIALS FOR DIFFERENT MIX RATIO:
Quantity estimation of materials is essentially required in any construction works and quantity of materials depend on the mix proportions of the concrete. In this article, we will discuss how to calculate quantities of materials for different mix ratio of concrete.
We will calculate quantities of materials for 100 cft concrete (By volume).
Let us assume the mix proportion is 1 : 2: 4 (cement:sand:stone =a:b:c)
Volume of wet concrete = 100 cft
Volume of dry concrete = 100 × 1.54 = 154 cft
What Is 1.54 Given Below:
CALCULATION FOR CEMENT:
Formula, Cement = (Volume of dry concrete/a+b+c) × a
= (154/a+b+c) × a = (154/1+2+4) × 1 = 22 cft
As we know, 1 bag of cement contains 50 kg of cement and the volume of 50 kg cement is 1.25 cft.
∴ Cement bags required = 22/1.25 =17.6 bags.
CALCULATION FOR SAND:
Formula, Sand = (Volume of dry concrete/a+b+c) × b
= (154/a+b+c) × b = (154/1+2+4) × 2 = 44 cft.
CALCULATION FOR STONE CHIPS:
Formula, Stone Chips = (Volume of dry concrete/a+b+c) × c
= (154/a+b+c) ×c = (154/1+2+4) × 4 = 88 cft.
CALCULATION FOR WATER CONTENT:
Let us assume the water/cement ratio of the concrete is 0.45.
w/c = 0.45
Required water for 1 bag cement = 0.45 × 1.25 = 0.5625 cft.
1 cft water = 28. 31685 Litre
Required water for 1 bag cement=0.5625 × 28.31685 = 16 Litre.
∴ Required water for 17.6 bags cement = 17.6 × 16 = 281.6 Litre.
SUMMURY:
Cement = 17.6 bags.
Sand = 44cft
Stone chips = 88 cft
Water =282 litre.
Note: You can use the same formula for different mix proportions such as 1:1.5:3 etc.
Here, we have used cubic feet unit but you can also calculate in cubic metre.