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Concrete cover for steel bar is much necessary to protect the steel against corrosion (rusting) and to provide resistance against fire. |
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If fire occurs in the building, the steel might lose so much strength to impair its reinforcing effect and the beams might collapse. |
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For R.C.C. Slab, the cover should be 15 mm. |
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For RCC column the cover should be 25 mm to 40 mm depending on the size of steel bar and on thickness of the column also. |
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In case of footing of column or walls, the cover shall be 50 mm to 75 mm . |
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In case of beams the cover should be 25 mm to 40 mm (1 to 1.5) depending on the size of steel bars. |
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When the numbers of steel bars are more than spacer between the bars must be used. |
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To keep crank bar in position, support of required height may be used under crank bar in the RCC slabs.
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