Quantity of Cement & Sand Calculation in Mortar

Quantity of cement mortar is required for rate analysis of brickwork and plaster or estimation of masonry work for a building or structure. Cement mortar is used in various 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:

For the calculation of cement mortar, let us assume that we use 1m³ of cement mortar Procedure for calculation is:

1. Calculate the dry volume of materials required for 1m³ cement mortar. Considering voids in sands, we assume that materials consist of 60% voids. That is, for 1m³ of wet cement mortar, 1.6m³ of materials are required.

2. Now we calculate the volume of materials used in cement mortar based on its proportions. Let’s say, the proportion of cement and sand in mortar is 1:X, where X is the volume of sand required.

Then, the volume of sand required for 1:X proportion of 1m³ cement mortar will be 1.6    x    X    /    1+X

3. Volume of cement will be calculated as:

1    x    1.6    /    1+X

Since the volume of 1 bag of cement is 0.0347 m³ , so the number of bag of cement will be calculated as:

(1    x    1.6    /    1+X    )    /    .0347

Example :

For cement mortar of 1:6, the quantity calculated will be as below:

Sand quantity:

1.6 x 6 ( 1+6 ) = 1.371 m³ 

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