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.
13%
As per the civil engineering thumb rule, weight of steel for one cubic meter of concrete is 100kgs to 130 kgs for normal structures
100 TONS
100 kgs of tor steel
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.
It depends on the type of structure according to the load subjected
1%
10
It all depends on the type and sizes of the steel used. It also depends on the load that the concrete has to take at certain points. 7865kg is the weight of a cubic meter of steel. Typical examples; A pile cap could contain 400kg/m3 A heavy duty industrial slab or structure could contain 200kg-400kg/m3 A footpath could contain 40kg/m3 (all depends on the design, but numbers above should give you a rough answer)
13%
As per the civil engineering thumb rule, weight of steel for one cubic meter of concrete is 100kgs to 130 kgs for normal structures
100 TONS
80 kg
it would depend entirely on the rebar design.....
100 kgs of tor steel
A cubic Meter of Steel is heavier than a cubic meter of wood because Steel is more dense than wood therefore there is more of it in the same cubic area. But if you compare a pound of wood to a pound of steel they will in fact be the same weight. :op
A regular slab for residential loads around 250 - 300mm thick would be expected to be about 1.5 - 2% steel.