# How to calculate Steel quantity for rcc slab

How to calculate Steel quantity for rcc slab, in this topic we know about how to calculate steel quantity for rcc slab and weight calculation. We know that roof slab is horizontal part of building put over brick wall for the covering of building structure.

For the roof casting of slab we have required concrete mix grade M20 or m25 in that we have require cement sand and aggregate along with reinforcement. In this topic we discuss about how to calculate Steel quantity for RCC slab and their weight calculation.

rcc slab :- there is three types of RCC slab put over brick wall that is Flat slab one way slab and two way slab. In this calculation take simple type of Steel calculation ignoring band deduction, crank bar and clear cover and development length.

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There is two types of Steel reinforcement provided in RCC slab one is main bar provided in shortest distance that’s why it is known as shortist bar have higher dimension and second one is distribution bar provided in longer distance that’s why it is known as longer span bar having lesser dimension.

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## How to calculate Steel quantity for rcc slab

We have given:-

Width of slab = 20 feet

Length of slab = 40 feet

Main bar dia = 10 mm

Distribution bar dia = 8 mm

Spacing between main bar = 6 inch =0.5 feet

Spacing between distribution bar = 6 inch

Calculation :-

No. of main bar =(length of slab/spacing)+1

Main bar = (40/0.5) +1

Main bar = 80+1 = 81 nose

No. of distribution bar =(length of slab/spacing)+1

Distribution bar = (20/0.5) +1

Distribution bar = 40+1 = 41 nose

Actually main bar provided in shorter direction that is width of slab

Total length of main bar = 81×20 feet

Total length of main bar = 1620 feet

And distribution bar provided in longer direction that is length of slab

Total length of cross bar = 41×40 feet

Total length of cross bar = 1640 feet

1) weight of main bar = (D^2/539)×L

Given main bar dia = 10 mm

Length of main bar = 1620 feet

Weight = (10×10/539)×1620 kg

Weight = 300.56 kg

2) weight of cross bar = (D^2/539)×L

Given cross bar dia = 8 mm

Length of cross bar = 1640 feet

Weight = (8×8/539)×1640 kg

Weight = 194.7 kg

495.26 kg (300.56 kg main bar and 194.7 kg cross bar) steel quantity required for roof casting of 800 sqft (20×40) 6inch thick rcc slab.

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