Question

The minimum percentage of steel in RCC slab using mild steel reinforcement is

1. 0.32%
2. 0.30%
3. 0.15%
4. 0.12%

Answer 1

Correct Answer - Option 3 : 0.15%

Concept:

As per IS 456:2000, Clause 26.5.2.2,

Minimum Reinforcement:

Minimum reinforced (Ast)min in either direction in slabs is given by

\({\left( {{A_{st}}} \right)_{min}} = \left\{ {\begin{array}{*{20}{c}} {0.0015\;{A_g}}&{for\;Fe250}\\ {0.0012{A_g}}&{for\;Fe415} \end{array}} \right.\)

Maximum Diameter:

The diameter of the reinforcing bar shall not exceed one-eighth of the total thickness of the slab.