# The percentage of minimum reinforcement (mild steel) should be the gross sectional area in slabs is -

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The percentage of minimum reinforcement (mild steel) should be the gross sectional area in slabs is -
1. 0.0012
2. 0.0015
3. 0.0018
4. 0.001

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Correct Answer - Option 2 : 0.0015

Concept:

As per IS 456:2000,

The slab is one-way if $\frac{{{\ell }_{y}}}{{{\ell }_{x}}}>2$

Where, ℓy, ℓx are the lengths of the longer and shorter spans respectively.

The minimum percentage of reinforcement is 0.15% of the gross area if a mild steel bar is used and 0.12% of the gross area if the HYSD bar is used.

Maximum dia of reinforcement, ${{\phi }_{max}}<\frac{D}{8}$

(i) Main Bars are spaced at  $min\left\{ \begin{matrix} 3d \\ 300~mm \\ \end{matrix} \right.~$

(ii) Distribution Bars are spaced at $min\left\{ \begin{matrix} 5d \\ 450~mm \\ \end{matrix} \right.$

Important Point:

The minimum percentage of reinforcement is 0.12% of the gross cross-sectional area if HYSD bars are used.