Concrete is the material which is
formed by mixing cement, sand and aggregates with water in a fixed proportion
which get harden after some time.
Use of Concrete in Building Construction:
·
Foundation
·
Column
·
Beam
·
Slab etc
In a building there are two types of mix that is
Nominal mix and Design mix.
 |
| Concrete Mixture |
Ratio and proportion of Design Mix.
Design Mix
M20:
·
Ratio:
(1:2.48:3.55)
·
Cement: 320
Kg/Cum
·
20mm Jelly:
683 Kg/Cum
·
12.5mm Jelly:
455 Kg/Cum
·
River Sand:
794 Kg/Cum
·
Total Water:
176 Ltr
·
Admixture:
0.7%
·
Fresh Concrete
Density: 2430 Kg/Cum
Design Mix M25:
·
Ratio:
(1:2.28:3.27)
·
Cement: 340
Kg/Cum
·
20mm Jelly: 667
Kg/Cum
·
12.5mm Jelly:
455 Kg/Cum
·
River Sand: 775
Kg/Cum (With 2% Moisture)
·
Total Water: 185
Ltr
·
Admixture: 0.6%
(Micro silica)
·
Fresh Concrete
Density: 2414 Kg/Cum
Design Mix M30:
·
Ratio: (1:2:2.87)
·
Cement: 380
Kg/Cum
·
20mm Jelly: 654
Kg/Cum
·
12.5mm Jelly:
436 Kg/Cum
·
River Sand: 760
Kg/Cum ( with 2% moisture)
·
Total Water: 187
Ltr
·
Admixture: 0.7%
(Micro silica)
·
Fresh Concrete
Density: 2420 Kg/Cum
Design Mix M35:
·
Ratio: (1:1.79:2.57)
·
Cement: 410
Kg/Cum
·
20mm Jelly: 632
Kg/Cum
·
12.5mm Jelly:
421 Kg/Cum
·
River Sand: 735
Kg/Cum ( with 2% moisture)
·
Total Water: 200
Ltr
·
Admixture: 0.7%
(Micro silica)
·
Fresh Concrete
Density: 2400 Kg/Cum
Design Mix M40:
·
Ratio: (1:1.67:2.39)
·
Cement: 430
Kg/Cum
·
20mm Jelly: 618
Kg/Cum
·
12.5mm Jelly:
4412 Kg/Cum
·
River Sand: 718
Kg/Cum (Bulk Age 1%)
·
Water Cement
Ratio : 0.43
·
Admixture: 0.7%
(Micro silica)
·
Fresh Concrete
Density: 2400 Kg/Cum
Note: Design
Mix varies as per Code
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