Answer / prashanth

For Slab-arround 75 kgs/Cum steel will consume.
ie Vol=Mass/Density
=75/7850
= .0095
For one Cum includes (Concrete and Steel)
ie =1-.0095
=.99 (Concrete)
Then ratio=.0095/.99
=.00955 X 100
=.95 (Ratio between concrete and steel)

For Beam-arround 130 kgs/Cum steel will consume.
ie Vol=Mass/Density
=130/7850
= .0165
For one Cum includes (Concrete and Steel)
ie =1-.0165
=.983 (Concrete)
Then ratio=.0165/.983
=.0167 X 100
=1.67 (Ratio between concrete and steel)

For Beam-arround 150 kgs/Cum steel will consume.
ie Vol=Mass/Density
=150/7850
= .0191
For one Cum includes (Concrete and Steel)
ie =1-.0165
=.98 (Concrete)
Then ratio=.0191/.98
=.0194 X 100
=1.94 (Ratio between concrete and steel)

Answer / prem

Min amount of steel : based on concrete volume

Slab- 0.7 - 1
Beam 1- 3
Column 1-7
Footing 0.5 -8 percentage

Answer / basel

Concrete building element
Weight of reinforcement in kg/m3
Bases 90-130
Beams 250-350
Capping beams 135
Columns 200-450
Ground beams 230-330
Footings 70-100
Pile Caps 110-150
Plate slabs 95-135
Rafts 115
Retaining walls 110-150
Ribbed floor slabs 80-120
Slabs – one way 75-125
Slabs – two way 67-135
Stairs 130-170
Tie beams 130-170
Transfer slabs 150
Walls – normal 70-100
Walls – wind 90-150

NOTE: For exposed elements add the following:
Beams +100%; Columns +15%; Walls +50%

Average values for typical concrete frames:
Heavy industrial = 130 kg/m3
Commercial = 100 kg/m3
Institutional = 90 kg/m3

Answer / a

the ratio of steel and concrete to use in slabs ,
beams, columns are best grad is 1:1.5:3

Answer / karthikkannan n

For steel ratio is 90 kg/cum of concrete. It may vary depends upon the design considerations.

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