Rate Analysis for Cement Mortar -Calculate Quantity and Cost
Gopal Mishra
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Rate analysis for cement mortar requires estimation of materials for cement mortar, i.e. quantity of cement and sand required for 1m3 for various proportions, i.e., CM 1:2, 1:4, 1:6, 1:8 etc. So, let us first calculate quantity of cement and sand required for 1m3 of cement mortar.
For 1m3 of wet cement mortar, 1.3m3 of cement and sand is required, due to presence of voids in sand in dry state. So, cement and sand quantity is calculated for 1.3m3 of cement mortar.
Steps for calculation of quantity of cement and sand for cement mortar:
Consider, we want to calculate quantity of cement and sand for CM 1:X, where, 1 is proportion of cement and X is proportion of sand. Then, quantity of cement shall be calculated as:
Quantity of cement =
Above formula gives quantity in volume. To calculate the quantity of cement in number of bags, we have to divide it by volume of cement of one bags. The volume of one bag of cement is 0.0347 m3.
Therefore, number of bags of cement =
Quantity of sand =
For example, for a proportion of CM 1:4,
Quantity of cement in bags = =7.492 bags
Quantity of sand = = 1.04 m3 of sand.
Estimation of Labour and Tools for cement mortar:
For 1m3 of cement mortar, semi-skilled labour is required for 0.27 days for mixing, unskilled labour for 0.26 for carrying of cement, sand and water. Hire charges for mechanical mixer is taken in lumpsum of can be taken as 0.27 days for mixing 1cum of mortar.