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None. Concrete may be formed without metal.
If you are reinforcing the concrete with rebar then it depends on what loads the reinforced concrete will have to bear, the dimension of the rebar, the safety factor involved, and lots of other geometric factors.
Steel bars quantity will be according to structure element; but a (very) rough average of 120 KG per cubic meter.
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How much percentage of steel required in one meter cubic of conceret?
13%
What is the ratio of steel in concrete?
As per the civil engineering thumb rule, weight of steel for one cubic meter of concrete is 100kgs to 130 kgs for normal structures
How many tons of steel reinforcement are needed for a 100 cubic meter concrete slab?
100 TONS
How many kg of steel reinforcement in one cubic meter concrete for foundation?
100 kgs of tor steel
How can you calculate for 1 cubic concrete steel requirement for slab?
well , reinforcement steel required for slab is nearly 0.7 to 0.8% of the volume of concrete so if concrete is 1 cum then steel will be 1*0.7/100 =0.007 but density of steel is 7850 kg/ cum so 0.007*7850=54.95 say 55 kg per cum so steel required to reinforce 1 cum concrete for slab is approximately 55 kgs.
