As an Engineer on site, you must know the amount of cement and sand require for a particular volume of concrete.
Knowing this will prevent you from running loss. I will explain to you how to calculate the amount of cement and sand require for any volume of concrete.
The calculations below is all about 1:2:4 mix ratio of Concrete
CALCULATING FOR CEMENTÂ
TOTAL RATIO = 1+2+4
= 7
Since:
Cement = 1
Sand = 2
Granite = 4
We are dealing with cement, we have 1/7 = 0.143
For 1m³ of cement = 1m³ * 0.143
= 0.143m³
Addition of waste and shrinkage 54% = (54/100 * 0.143) + 0.143
= 0.0772m³ + 0.143m³
= 0.22m³
Density =Â Mass/Volume
1440 = 50/Volume
Volume = 0.03472m³
1 Bag of Cement = 0.03472m³
Y Bags of Cement = 1m³
Y = 1/0.03472
Y = 28.8 bags of Cement
1m³ of cement = 28.8 bags
0.22m³ of cement = X bags
X = 6.3 bags of cement
Now for 1:2:4 mix ratio, the number of cement require to mix 1m³ of concrete
= 6.3 bags.
Assuming you are to calculate the amount of cement require for 0.55m³ of concrete
1m³ of Concrete = 6.3 bags of cement
0.55m³ of concrete = X bags of cement
X = 3.47 bags of cement.
This means 3.47 bags of cement will mix 0.55m³ of concrete using 1 : 2 : 4 mix Ratio
CALCULATING FOR SAND
TOTAL RATIO = 1+2+4 = 7
Since we are dealing with sand, we have 2/7 = 0.285
For 1m³ of sand = 1m³ * 0.285
= 0.285m³
Addition of 35% bulking = 0.099m³
Addition of 10% waste = 0.03m³
= 0.285 + 0.099 + 0.03
= 0.414m³
0.65m³ of sand = 1 ton of sand
0.414m³ of sand = x tons of sand
X = 0.637 tons.
Now for 1:2:4 mix ratio, the number of sand require to mix 1m³ of concrete
= 0.637 tons.
Assuming you are to calculate the amount of sand require for 0.55m³ of concrete
1m³ of concrete = 0.637 tons of sand
0.55m³ of concrete = X tons of sand
X = 0.35 tons of Sand
This means 0.35 tons of sand will mix 0.55m³ of concrete using 1 : 2 : 4 mix Ratio
Check out How to Calculate The Total Tons of Granite for a Volume of Concrete
This is a must know calculation for Engineer, Quantity Surveyor and Site Manager on site to avoid wastage of Materials
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Calculating Total Bags of Cement and Tones of Sand Require in a Particular Volume of Concrete
Watch your computations bro, you messed up you used .283 on your computation instead of .285, 2/7= .285 yet you used .283 edit it because its misleading readers
Thanks for the correction. I already take note of that and proper amendment will be made with immediate effect.
AOA
I want to apply plaster on the roof of my top floor flat can you please calculate me the cost of it I don’t know how much cement sand etc will require for it I want the final product to be at least 3 inches thick the area to cover is 1000 sqft
thank you
Please Check out How to Calculate The Total Bags of Cement for a Unit Area of Plastering for basic explanation, You can also Post this on our Forum for answers from different people.
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Hello I want floor an area with concret 3cm thick and 10m wide, 11m long.so I wish to know what quantity of cement in bags, sand and granite in wheelbarrow to use. Thank u
Good information, makes me remember some things i had forgotten. You know sometimes you go to the market place and you tend to forget what you learned in school. Very insightful information. Thanks again PIN.