## Labels

Midas Civil (43) Staadpro (32) General (30) Latest news (16) Photos (15) Specifications (11) Discussions (6) GIS (4) Tower (3) Drawings (2) Roads (2) jobs (2) Batching (1) Concrete (1) Enviornment (1) Excel (1) Plant (1) Railway (1) skyscrape (1)

## Monday, February 13, 2017

### CIVIL ENGINEER: 1cum cement = how much bag?

Assumptions:

1.Nominal mix is 1:2:4
2.Wastage of cement during handling is considered as :2%.
3.Output from mixer is considered as 67% in volume of the input.
( For getting 1 Cum output , we need dry mix as 1/0.67= 1.49 say 1.50 Cum).
4.Density of cement : 1440 Kg/cum.
Mass of one bag   = 50kg
Volume of one bag of cement = 50/1400 =0.035714 m3
No. of bags in m3                  =1/0.035714 =28 bags

With these assumptions about data , the actual calculations are as follows :
Cement per CuM = 1.52 *28.8 /( 1+2+4 )
= 1.52*28.8/7 = 6.25 Bags

Same formula can be used for calculating cement for other nominal mixes also.
In case you feel that cement is wasted more than 2 % , proceed as under :
Wastage : 5 %
Take the factor of 1.5 +0.05 = 1.55 instead of 1.52 in the above formula.