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Here is the derivation of that D2/162.2, Weight of steel bar per meter = Area of the steel x Density of steel x Bar length. = (3.14 x D2 /4) x 7850 kg/m3 x 1m (refer these posts basic formulas & unit weight of materials) = (D2 x 6162.25)/(1000 x 1000)
Lets take example of RCC Column, where reinforcement required is 2.5% of concrete volume, weight of steel required will be: =196.25 kg. 2. Labour Requirement for 1m3 of RCC: Labours required are presented in terms of days required by particular labour to complete its work for the given quantity of concrete.irst method is, when we have the drawing available, we can calculate the total weight of steel required divided by total volume of concrete for different components. This will give us the weight of reinforcement steel per cubic meter of concrete.