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.
Volume of mortar= 1 m³
Mix Ratio –> 1:6
Dry volume of mortar = Wet volume x 1.33
∴Dry Volume = 1.0 m³x 1.33 = 1.33 m³
Quantity of Cement = {(Dry Volume of mortar x Cement ratio) / (Sum of the ratio)}
∴Quantity of cement = (1.33 x 1) /(1+6)=0.19m³
Density of Cement = 1440kg/m³
∴ Weight of Cement = 1440 x 0.19 = 273.6Kg
1 bag of cement contains 50 kg of cement
∴ Number of bags = 273.6 Kg/50 = 5.472 No’s
Cement : Sand :: 1:6
Quantity of Sand = Quantity of Cement x 6
∴ Quantity of Sand = 0.19 m³ x6= 1.14 m³
1m³=35.3147 Cubic Feet (CFT)
∴ Quantity of sand = 1.14 x 35.3147 = 40.258 CFT
Density of sand = 1920kg/m³
∴ Weight of the sand= 1.14m³x1920kg/m³= 2380.8 kg =>2.3808 tonnes
Material Cost:
| Material for one cu. m. | Quantity | rate | per | Amount |
| Cement | 5.472 bags | Rs. 350 | bag | Rs. 1915.2 |
| Sand | 1.14 m³ | Rs. 1350 | m³ | Rs. 1539 |
| Total | Rs. 3454.2 |
Labour Cost:
| Labours for 1m³ | No’s | Wages/day | Amount |
| Mazdoor | 0.75 | Rs. 500 | Rs. 375 |
| Bhisti | 0.07 | Rs. 400 | Rs. 28 |
| Rs. 403 |
Summary:
Cost of material = Rs. 3454.2
Cost of labours = Rs. 403
Sum of labour & material cost= Rs. 3857.2
Add:-
1.Water charge @ 1.5% = (1.5/100)x3857.2 = Rs. 57.858
2.Contractor’s profit @10 % = (10/100)x3857.2= Rs. 385.72
Total cost = 3857.2 + 57.858 +385.72= Rs. 4300.778