USEFULL DATA FOR ESTIMATION





Mixer Machine Capacity:
Sr. No:
Capacity
Dry volume     in cum
Wet volume     in cum
Output per hour
Petrol consumption per hour in litre
Remarks
1
6' / '4'
0.170
0.113
2.266
1.000
Each batch of concrete requires about 3 minutes of mixing
2
7' / '5'
0.198
0.142
2.832
1.400
3
10' / '7'
0.283
0.198
3.965
1.700



Cement Mortar:
Sr. No:
Ratio
Cement in Kg
Cement       in  bag
 Sand      in      'cum'.
   Remarks
1
1 : 1'
1054
21.08
0.73
Water may be generally taken as 140 litres per 'cum'.
50 kg. cement bag size is (400mm x 350mm x 250mm internally. Volume per is = 0.035 'cum'.
2
1 : 2'
686
13.72
0.96
3
1 : 3'
491
9.82
1.02
1
1 : 4'
380
7.60
1.05
5
1 : 6'
253
5.06
1.05
6
1 : 8'
192
3.84
1.06
Cement Concrete:
Sr. No:
Ratio
Cement in Kg
Cement in bag
Sand in 'cum'.
Aggregate in 'cum'.
Remarks
1
1 : 4 : 8' Nominal Mix
161
3.22
0.45
0.89
2
1 : 3 : 6' Nominal Mix
212
4.24
0.44
0.88
3
1 : 2 : 4' M15
317
6.34
0.44
0.88
4
1 : 1.5 : 3' M20
403
8.06
0.42
0.84
5
1 : 1 : 2' M25
555
11.10
0.385
0.77
   Remarks
Considering dry density of concrete is 1.54 'cum'.
Aggregate may be used 60% : 40% ratio of 20mm and 10mm down respectively.
Water required for concrete varies from 28 to 35 litres per bag of (50kg) cement depending on the mix and proportion.
Reinforcement (Steel) works:
Reinforcement usually required in various situation is as follows:
Culvert and foundaion = 0.5% to 1%
Slab and landing = 0.5% to 1.5%
Arch, wal, floor and flate roof = 1% to 2%
Column and brace = 2 % to 3%
Column and brace = 2 % to 3%
Pile = 2% to 5%
Remarks
Binding or tying wire for reinforcement may be taken as 0.9 to 1.3 kg per quintal of reinforcement.
One 50 kg. bag of cement will make approximately following volume of concrete:
The equivalent size of a box for 50 kg. cement bag is 400mmx350mmx250mm internally.
0.133 'cum' of 1 : 1.5 : 3 concrete.
0.166 'cum' of 1 : 2 : 4 concrete.
0.140 'cum' of 1: 1 : 2 concrete.
0.250 'cum' of 1: 3 : 6 concrete.
0.333 'cum' of 1: 4 : 8 concrete.
0.400 'cum' of 1: 5 : 10 concrete.
0.500 'cum' of 1: 6 : 12concrete.