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A quantity of cement mortar is required for a building or structure to analyze the rate of brickwork and plaster or to estimate the masonry work. Cement mortar is used in different proportions, i.e. 1:1, 1:2, 1:3, 1:4, 1:6, 1:8 etc.
Calculation Of Quantity Of Cement Mortar In Brickwork And Plaster:
Let's assume that the volume of masonry work is 20cft. and we assume the ratio of mortar 1:4.
When we estimate the mortar quantity for any masonry work, we just get the wet volume of mortar.
Now we will see how to calculate the dry volume of mortar and then we will calculate the cement and sand quantity in 20cft.
Grains of sand in dry conditions include air voids. Therefore, by adding water to the dry sand, the sand volume will be reduced This happens because of the presence of air voids in particles of sand. The percentage of air void sand compressibility is between 20% and 27%.
Normally, when converting the wet volume into the dry volume, we take the highest percentage of air void compressibility of sand. That's 27% of it.
So when we calculate the dry volume of mortar, we just multiply the wet volume by 1.27.
Dry volume= 20 x 1.27 = 25.4 cft
So now we have the dry volume of mortar which is 25.4 Cft
Now we will calculate the quantity of sand and cement in 25.4 Cft.
first, we will calculate the sum of ratio and our mixing RATIO IS 1:4.
Sum of ratio= 1+4= 5
The volume of cement will be calculated as:
(1 ÷ 5) x 25.4 = 5.08 cft
Since the volume of 1 bag of cement is 1.25 Cft, so the number of a bag of cement will be calculated as:
5.08 ÷ 1.25 = 4.064 bags
The volume of Sand will be calculated as:
(4 ÷ 5) x 25.4 = 20.32 cft
Quantity of cement in 20 Cft masonry mortar = 4.064 Bags say 4.5 or 5 bags
Quantity of cement in 20 Cft masonry mortar = 20.32 cft
Conclusion
To calculate the dry mortar volume, you simply need to estimate your work item's wet mortar volume and then multiply it by 1.27.
Once you get the required dry mortar volume the amount of cement and sand required for the mortar can be calculated based on the proportion of the mixture.
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