Civil Engineering - Estimating and Costing - Discussion
Discussion Forum : Estimating and Costing - Section 1 (Q.No. 22)
22.
For 12 mm thick cement plastering 1 : 6 on 100 sq.m new brick work, the quantity of cement required, is
Discussion:
43 comments Page 4 of 5.
Hari said:
5 years ago
Why we take 30% extra? Please explain.
Kaku said:
5 years ago
The correct answer is 0.2228m3.
Jon said:
5 years ago
Why take 30% extra here? Please explain me.
Lilly said:
4 years ago
Adding 30 per extra for uneven surface and to fill up joints.
Basanta said:
3 years ago
It's for 0.247m3.
(2)
Vintage said:
3 years ago
Plastering thickness 12 mmc= 12/1000 = 0.012m.
Volume of cement mortar required = (Plastering Area x thickness) = 100 m2 x 0.012m = 1.2 m3
(This is a wet volume which means we need this much volume of cement mortar after mixing water.
So, for dry volume, we have to add 30-35% as bulkage of sand, we are using 35% and wastage as 20%).
Consider 35% Sand Bulkage = 1.2 m3 x (1 + 0.2 + 0.35) = 1.86 m3
Cement required = (1/7) x 1.86 = 0.265 m3.
Volume of cement mortar required = (Plastering Area x thickness) = 100 m2 x 0.012m = 1.2 m3
(This is a wet volume which means we need this much volume of cement mortar after mixing water.
So, for dry volume, we have to add 30-35% as bulkage of sand, we are using 35% and wastage as 20%).
Consider 35% Sand Bulkage = 1.2 m3 x (1 + 0.2 + 0.35) = 1.86 m3
Cement required = (1/7) x 1.86 = 0.265 m3.
(8)
Narendra saud said:
3 years ago
You can take 30% for uniform wall and 25% for dry volume i.e. total of 55%.
Now, 10x10x0.012 = 1.2
Hence (1.2/1+6)+(1.2/1+6)x55/100 = 0.2785.
Now, 10x10x0.012 = 1.2
Hence (1.2/1+6)+(1.2/1+6)x55/100 = 0.2785.
(6)
Tarkraj said:
3 years ago
No, it's wrong.
In mortar or plastering, we increase only by 30%.
But for PCC we increase 50-55%.
In mortar or plastering, we increase only by 30%.
But for PCC we increase 50-55%.
(3)
Philip Isabirye said:
3 years ago
Interesting, Thanks all for explaining.
(3)
Ankit kumar singh said:
2 years ago
The vol of plaster=0.012*100 = 1.2.
12 mm thickness is used;
So for vol of wet mortar increment is done by 30%.
(if 15 mm then 25%, if 20 mm then 20%)
Now vol of wet mortar =1.2 * 1.3 = 1.56.
(25% increment in wet mortar for vol of dry mortar)
The vol of dry mortar =1.56 * 1.25 = 1.95.
The vol of cement =1/7 * 1.95 = 0.278.
12 mm thickness is used;
So for vol of wet mortar increment is done by 30%.
(if 15 mm then 25%, if 20 mm then 20%)
Now vol of wet mortar =1.2 * 1.3 = 1.56.
(25% increment in wet mortar for vol of dry mortar)
The vol of dry mortar =1.56 * 1.25 = 1.95.
The vol of cement =1/7 * 1.95 = 0.278.
(19)
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