QUANTITY OF CEMENT & SAND CALCULATION IN MORTAR

         Quantity of cement mortar is required for rate analysis of blockwork.. Cement mortar is used in various proportions, i.e. 1:1, 1:2, 1:3, 1:4, 1:6, 1:8 etc but we are going to base our calculations on  1:6 means one portion of cement is mixed with an equivalent volume or ratio of six of same portion of volume of cement in sharpsand.That is, if I have a cement of 1m3, then I will need to mix it with 6m3 of sharpsand.
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 consists 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

3. Volume of cement will be calculated as:

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

Example:

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

Quantity of cement (in bags):
Volume of cement =
There number of bags required = = 6.58 bags.
This is for 1m³ so for 5m³   the Sand quantity will be:

1.37m³   x 5m³ = 6.85       while foe cement is:

6.58bags   x 5m³=32.9bags