We have already discussed the importance of rate analysis. and how it will help us to face everyday scenarios.
Assume that we are going to analysis the rate for 1 m3 of Brickwork (B.W)
STEP 1 – Volume of single brick without mortar
Volume of 1 brick without mortar = 0.19 x 0.09 x 0.09 = 0.0015 m3
STEP 2 – Volume of single brick with mortar
While brickwork construction we will add cement mortar around 3 sides (left, right & top).
So adding 10mm thick on each side of brick as mortar thickness
The volume of brick with mortar = (0.19+0.010) x (0.09+0.010) x (0.09+0.010) = 0.20 x 0.1 x 0.1 = 0.002 m3
The volume of 1 brick with mortar = 0.002 m3
STEP 3 – Number of bricks for 1 m3 Brickwork
Number of bricks with mortar for 1 m3 = 1 cubic meter / volume of bricks with mortar = (1/0.002)= 500 Nos
So the required number of bricks for 1 m3 = 500 Nos
STEP 4 – Cement Mortar Volume for 1m3 of Brickwork
Cement Mortar Volume = Volume of brickwork with mortar – the volume of bricks without mortar
Volume of bricks with mortar in 1 m3 = 500 x 0.002 = 1 m3
Volume of bricks without mortar in 1 m3 = 500 x 0.001539 = 0. 7695 m3
Therefore required cement mortar = 1 m3 – 0.7695 m3 = 0.2305 m3
Step 5 – Calculate Cement & Sand Volume
As we know the required cement mortar = 0.2305 m3
Assuming cement mortar ratio as 1:5 (1 Part Cement : 5 Part Sand)
We have already discussed the cement mortar volume calculation in plastering work post.
The above formula will give a dry volume of cement mortar, So to get wet concrete volume, we have to multiply the dry volume by 1.33
Total Parts = 1+5 =6
Required Volume of Cement = 1/6 x 1.33 x Mortar Volume = 1/6 x 1.33 x 0.2305= 0.0511 m3
To convert into cement bags – (0.0511 x 1440)/50 = 1.47 Bags or 73.58 Kg
Required Sand Volume = 5/6 x 1.33 x Mortar Volume = 5/6 x 1.33 x 0.2305 = 0.2554 m3
Materials required for 1 m3 Brickwork is
From our thumb rule estimation (Labour Output Per Day), we are calculating the labour estimation as follow,
Description | Unit | Qty | Rate | Amount |
Analysis of the rate for 1 m3 of Brick Work (B.W) in Cement Mortar 1:5 (1 Cement: 5 coarse sand) using common burnt clay bricks of class designation 75, including curing, etc. | ||||
Materials | ||||
Cement | Bags | 1.47 | 350 | 514.5 |
Sand | m3 | 0.2554 | 1800 | 459.72 |
Bricks including wastage | Nos | 500 | 7 | 3500 |
Manpower | ||||
Mason | Each | 0.4 | 700 | 280 |
Male Mazdoor | Each | 0.5 | 500 | 250 |
Female Mazdoor | Each | 0.5 | 400 | 200 |
Waterman | Each | 0.2 | 400 | 80 |
Subtotal | 5284 | |||
Tools & Tackles | 1% | 53 | ||
Add for Sundries & Contingencies | 3% | 158.5 | ||
Add for Overhead & Contractor profit | 10% | 528 | ||
Total | 6023.5 | |||
Rate per m3 | 6023.5 |
You may download the Excel Sheet of Rate Analysis: Rate Analysis Sheet
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