How to construct a concrete column over existing slab of 150mm?
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But why you want a column raised on a slab. The moment you do, a point load will come on slab at that point so it is not possible/advisable. Describe problem for alternative solution.
You can’t build a column on slab unless slab is designed for the load you needed for. It is regarded as pt load on slab which is usually not designed for it, it all relies on what purpose you want to raise the column on slab.
Steel reinforcement is divided into two basic categories:
Main reinforcement bars are employed in RCC structures to ensure resistance against the whole design loads coming on it.
Whereas the secondary reinforcement bars are mainly employed due to durability and aesthetic reason.