In an RC beam main reinforcement consists of 16 mm bars and coarse aggregate size used is 20 mm. The horizontal distance between two parallel reinforcing bars should not be less than

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BPSC AE Paper 5 (Civil) 11 Nov 2022 Official Paper
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  1. 20 mm
  2. 21 mm
  3. 25 mm
  4. 16 mm

Answer (Detailed Solution Below)

Option 3 : 25 mm
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Concept:

As per IS456: 2000, cl. 26.3.2,

The horizontal distance between two parallel main reinforcing bars shall usually be not less than the greatest of the following –

1. The diameter of the bar if the diameters are equal.

2. The diameter of the larger bar if the diameters are unequal.

3. 5 mm more than the nominal maximum size of coarse aggregate.

Explanation:

Dia of main reinforcing bar = 16 mm

Size of coarse aggregate = 20 mm

The horizontal distance between two parallel reinforcing bars should not be less than greatest in the following:

1. Diameter of the bar = 16 mm

2. 5 mm more than the nominal maximum size of coarse aggregate = 20 + 5 = 25 mm

So, the horizontal distance between two parallel reinforcing bars should not be less than 25 mm. 

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